CN112007760A - A kind of beneficiation method for processing high sesquioxide collophosphate ore - Google Patents

Abstract

The invention relates to a beneficiation method for processing high sesquioxide collophosphate ore, belonging to the technical field of mineral processing. The method performs reverse flotation operation after crushing, grinding and grading raw ore, and the obtained reverse flotation coarse concentrate is ground again. After ore classification, positive flotation operation is performed, and the obtained positive flotation coarse concentrate is subjected to acid leaching operation to obtain the final phosphate concentrate. The method of the invention can save water, all the waste water can be reused, and the treatment cost is low. Compared with the conventional forward-reverse flotation process or double reverse flotation process, the process of the invention is not only aimed at high sesquioxide collophosphate ore, but also aimed at siliceous calcareous type collophosphate ore, and has the advantages of stable mineral processing process and separation effect Well, the concentrate product has the advantages of low iron and aluminum semi-oxide.

Description

A kind of beneficiation method for processing high sesquioxide collophosphate ore

technical field

The invention belongs to the technical field of mineral processing, and particularly relates to a beneficiation method for processing high sesquioxide collophosphate ore.

Background technique

In China, phosphate rock resources are mainly concentrated in Yunnan, Guizhou, Sichuan, Hunan, Hubei and other places, mainly sedimentary phosphate rock, of which medium and low grade collophosphate rock is the main one, and some of the low-grade siliceous collophosphate rock contains aluminum and phosphate rock. Iron sesquioxide (R ₂ O ₃ ) is relatively high. In the traditional wet production of phosphoric acid, iron and aluminum elements can not only cause phosphoric acid to form sludge, but also greatly affect the growth of calcium sulfate crystals, eventually causing In the subsequent concentration process, the loss of P ₂ O ₅ is relatively large. Therefore, in order to reduce the impact on the wet-process phosphoric acid and the acid-process fertilizer production process, it is necessary to reduce the content of iron and aluminum sesquioxides in the phosphate concentrate as much as possible.

At present, for high-alumina, high-iron and low-grade siliceous calcareous phosphate rock, the conventionally used process flow is forward-reverse flotation process and pre-desliming-double reverse flotation process. The disadvantages of finer degree, finer granularity of concentrate products, difficulty in conveying and dewatering of concentrates, and high cost of concentrate beneficiation, etc. Moreover, the positive and negative flotation process must rely on tailings ponds to operate normally, and the new phosphate mines have been very It is difficult to approve the tailings pond again. However, the pre-desliming-double reverse flotation process has the disadvantages of poor chemical selectivity, the process is greatly affected by the sludge, the loss of P ₂ O ₅ in the desliming operation is serious, and the recovery rate of the final concentrate P ₂ O ₅ is low. .

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is aimed at the deficiencies of the prior art, and proposes a more reasonable and efficient process for removing silicates, carbonates, iron-containing and aluminum-containing gangue minerals in collophosphate rock. A beneficiation method for high sesquioxide collophosphate rock.

The technical problem to be solved by the present invention is achieved through the following technical solutions. The invention is a beneficiation method for processing high sesquioxide collophane phosphate ore. After classification, positive flotation operation is performed, and the obtained positive flotation coarse concentrate is subjected to acid leaching operation to obtain the final phosphorous concentrate.

A kind of beneficiation method for processing high sesquioxide collophosphate rock according to the present invention, its further preferred technical scheme is as follows:

1. The acid used in the acid leaching operation is an inorganic strong acid or an organic strong acid. The inorganic strong acid is selected from one or more of sulfuric acid, hydrochloric acid, nitric acid and phosphoric acid, and the organic strong acid is selected from one or more of oxalic acid and citric acid. .

2. In this method, two return water tanks and high-level water tanks are separately set up to store positive flotation return water and reverse flotation return water respectively. The return water of the positive flotation return tank is only used for positive flotation, and the reverse flotation return water tank The return water of the acid leaching operation is only used for reverse flotation, and the supernatant water of the acid leaching operation is returned to the reverse flotation return tank or returned to the acid leaching operation; the overflow of the return tank is returned to the high-level tank, and then flows into the corresponding process flow.

3. The products in the tank of the reverse flotation operation are not directly fed into the positive flotation operation, but go through the dehydration operation to control the moisture content of the rough concentrate in the reverse flotation operation to 10%~16%.

4. The products in the tank of the positive flotation operation are not directly fed into the acid leaching operation, but through the dehydration operation, the moisture content of the positive flotation coarse concentrate is controlled at 10%~16%.

5. The grinding fineness of the grinding in the reverse flotation washing operation is -200 mesh, which is 50.00%~70.00%; the grinding fineness of the grinding in the positive flotation operation is -200 mesh, accounting for 80%~98%.

6. The inhibitor of reverse flotation operation selects inorganic acid, which is sulfuric acid, phosphoric acid or a mixture of the two, and fatty acid soap organics as collector; sodium carbonate as pH adjuster for positive flotation operation, and water glass as Inhibitors of silicate minerals, polysaccharides and polyphenol organic polymers are used as inhibitors of iron-containing minerals, and fatty acid soap organics are used as collectors.

7. The tailings of positive flotation and the tailings of reverse flotation shall be treated by dry heap, tailings pond storage or tailings filling method according to the actual situation.

A kind of beneficiation method for processing high sesquioxide collophosphate rock according to the present invention, its preferred steps are as follows:

(1) After crushing, the raw ore is sent to a grinding and grading operation, and then sent to the reverse flotation operation;

(2) The product in the tank of the reverse flotation operation is dewatered to obtain the reverse flotation coarse concentrate, and the flotation foam, that is, the reverse flotation tailings, determines the dehydration process according to the specific tailings treatment process;

(3) The filtrate produced by the reverse flotation dehydration operation is returned to the reverse flotation operation;

(4) The rough concentrate of reverse flotation is fed into the second-stage grinding and classification operation, and then fed into the positive flotation operation. The concentrate and tailings of the positive flotation operation are respectively fed to the dehydration operation. The products in the flotation tank are processed according to the specific conditions. The dehydration process is determined by the tailings treatment process. The dehydrated product is the positive flotation tailings, and the flotation foam is the positive flotation concentrate that is dewatered into the positive flotation coarse concentrate;

(5) The filtrate produced by the positive flotation dehydration operation is returned to the positive flotation operation;

(6) The positive flotation coarse concentrate is fed into the acid leaching operation. After the acid leaching, the dehydration operation is performed, and the supernatant liquid is returned to the process for use, and the dehydrated product is the final phosphate concentrate.

A kind of beneficiation method for processing high sesquioxide collophosphate rock according to the present invention, its further preferred specific steps are as follows:

(1) After the raw ore is crushed, it is sent to the first stage of grinding and classification. The fineness of the first stage of grinding is controlled to be -200 mesh 50.00%~70.00%, and the ground pulp is sent to the reverse flotation operation;

(2) The products in the tank of the reverse flotation operation are dewatered to obtain the reverse flotation coarse concentrate. The flotation foam, that is, the reverse flotation tailings, determines the dehydration process according to the specific tailings treatment process, and the reverse flotation operation inhibitor is inorganic. Acid, the inorganic acid is sulfuric acid, phosphoric acid or a mixed acid of the two, and the dosage is 5 kg/t ~ 9 kg/t raw ore, and the collector is fatty acid soap organic matter, and the dosage is 500 g/t ~2000 g/t raw ore;

(3) The filtrate produced by the reverse flotation dehydration operation is sent to the reverse flotation return water sedimentation tank, and the overflow of the return water sedimentation tank is sent to the acid high-level tank, and returned to the reverse flotation operation through the reverse flotation return water system;

(4) The rough concentrate of reverse flotation is sent to the second-stage grinding and classification operation, and the second-stage grinding fineness is controlled to be -200 mesh 80%~98%, and the ground pulp is sent to the positive flotation operation, and the positive flotation operation The adjusting agent selects sodium carbonate as the pH adjusting agent, the dosage is 0 g/t ~ 3000 g/t raw ore, water glass is used as the inhibitor of silicate minerals, the dosage is 1000 g/t ~ 7000 g/t raw ore, polysaccharides and polysaccharides. Phenolic organic polymers are used as inhibitors of iron-containing minerals, and the dosage is 30 g/t ~ 500 g/t raw ore. The collector is fatty acid soap organic matter, and the dosage is 500 g/t ~2000 g/t raw ore. Positive flotation The concentrated ore and tailings of the operation are respectively fed to the dehydration operation. The products in the flotation tank are determined according to the specific tailings treatment process. The dewatered product is the positive flotation tailings, and the flotation foam is the positive flotation concentrate. After dehydration operation, it becomes positive flotation coarse concentrate;

(5) The filtrate produced by the positive flotation dehydration operation is sent to the positive flotation return water sedimentation tank, and the overflow of the return water sedimentation tank is sent to the alkaline high-level tank, and returned to the positive flotation process through the positive flotation return water system;

(6)) The positive flotation coarse concentrate is fed into the acid leaching operation. After the acid leaching, the dehydration operation is performed, and the supernatant liquid is returned to the process for use. The dehydrated product is the final phosphate concentrate. The leaching acid is an inorganic strong acid or an organic strong acid. The strong acid is one or more of sulfuric acid, hydrochloric acid, nitric acid, and phosphoric acid, and the organic strong acid is one or more of organic strong acids such as oxalic acid and/or citric acid.

The inventor's research found that the mineral composition of high sesquioxide siliceous calcareous collophosphate ore is single, mainly low-carbon fluorapatite, a small amount of carbonapatite, apatite, and gangue minerals are mainly divided into carbonates There are three parts: silicate minerals, silicate minerals and iron-bearing minerals. Carbonate minerals are mainly dolomite and calcite, silicate minerals are mainly quartz and aluminosilicate clay minerals, and iron-bearing minerals are mainly Pyrite and hematite. In the prior art, forward-reverse flotation process or pre-desliming-double reverse flotation process is generally used for this type of ore. Forward-reverse flotation has fine grinding fineness, large dosage of chemicals, high beneficiation cost, and is subject to The backwater affects the shortcomings such as instability of the positive flotation process, and the use of the pre-desliming-double reverse flotation process has poor chemical selectivity, the process is greatly affected by the sludge, and the loss of P ₂ O ₅ in the desliming operation is serious. Disadvantages such as low removal rate of aluminosilicate. Therefore, in view of the above technical problems, the inventors have researched the technical solutions of the present invention.

In the method of the present invention, the ore composition of the high sesquioxide siliceous calcareous collophosphate ore is as follows: the P ₂ O ₅ grade is 16.1%-28.9%, the MgO mass content is 1.5%-6.0%, and the SiO ₂ mass content is 11.1% ~31.9%, the mass content of Al ₂ O ₃ is 1.0% ~ 6.8%, and the mass content of Fe ₂ O ₃ is 0.5% ~ 3.9%;

In the collophosphate ore concentrate obtained by the method of the invention, the grade of P ₂ O ₅ is 32.5%-36.9%, the mass content of MgO is 0.2%-0.4%, and the mass of aluminum-containing iron-containing sesquioxide (R ₂ O ₃ ) is The content is 0.8%~1.5%.

Compared with the prior art, the technical scheme of the present invention has the following beneficial effects:

(1) By adding an acid leaching process after the flotation process, it can be used for various types of high sesquioxide siliceous calcareous phosphate rock, especially for the collophosphate rock with high calcite content, and the phosphate concentrate can be further improved. It has the advantages of strong process adaptability and wide application range;

(2) The reverse-positive flotation process adopts separate return water, which effectively avoids the influence of excess Ca ²⁺ , PO ₄ ^3- , SO ₄ ^2- carried in the reverse flotation return water on the positive flotation of phosphate rock. Consider not setting up tailings ponds to save investment. The invention has the advantages of simple backwater treatment process, low investment cost, low operation effect and cost, etc., and is beneficial to the stable operation of the reverse-positive flotation process in actual production.

(3) The choice of flotation process Putting the reverse flotation operation in the front and the positive flotation in the back can greatly reduce the presence of Ca ²⁺ , PO ₄ ^3- , and PO 4 3- , which have a great influence on the positive flotation process in the return water of the positive flotation. The concentration of SO ₄ ^2- ions is beneficial to ensure the stability of the positive flotation process. (4) Part of the waste acid water produced by the acid leaching process can be returned to the acid leaching operation, and part of it can be returned to the reverse flotation, which can be used as a reverse flotation inhibitor, which can reduce the amount of acid used in the reverse flotation.

(5) The energy consumption of grinding accounts for a large part of the beneficiation cost. Through the stage grinding stage flotation, the over-grinding of minerals is well avoided, and the low grinding fineness is well achieved. The effective separation of useful minerals and gangue is realized, the filtering operation of concentrate is improved, and the grinding cost of beneficiation is effectively reduced;

(6) By adding water glass, polysaccharides and polyphenol organic polymers as inhibitors of aluminosilicate minerals and iron-bearing gangue minerals, respectively, in the positive flotation desiliconization operation, the useful minerals and gangue are improved. The floating difference between minerals greatly reduces the content of aluminum-containing iron-containing sesquioxide (R ₂ O ₃ ) in the phosphorus concentrate.

Detailed ways

The specific technical solutions of the present invention are further described below, so that those skilled in the art can further understand the present invention, but do not limit the rights thereof.

Embodiment 1, a kind of beneficiation method for processing high sesquioxide collophosphate rock:

(1) After the raw ore is crushed, it is sent to the first stage of grinding and grading operation, and the first stage of grinding fineness is controlled to -200 mesh 55%, and the ground pulp is sent to the reverse flotation operation;

(2) The products in the tank of the reverse flotation operation are dewatered to obtain the reverse flotation coarse concentrate. The dehydration process of the flotation foam (reverse flotation tailings) is determined according to the specific tailings treatment process, and the reverse flotation operation inhibitor is selected. Sulfuric acid, the dosage is 6kg/t raw ore, and the collector is fatty acid soap organic matter, and the dosage is 700g/t raw ore;

(3) The filtrate produced by the reverse flotation dehydration operation is sent to the reverse flotation return water sedimentation tank, and the overflow of the return water sedimentation tank is sent to the acid high-level tank, and returned to the reverse flotation process through the reverse flotation return water system;

(4) The coarse concentrate of reverse flotation is fed into the second-stage grinding and classification operation. The second-stage grinding fineness is controlled to -200 mesh and 90%. The ground pulp is fed into the positive flotation operation, and the positive flotation operation adjuster is selected. Sodium carbonate is used as pH adjuster, the dosage is 2000g/t raw ore, water glass is used as inhibitor of silicate minerals, the dosage is 2500g/t raw ore, polysaccharides and polyphenol organic polymers are used as inhibitors of iron-containing minerals , the dosage is 50g/t raw ore, the collector is fatty acid soap organic matter, the dosage is 850 g/t raw ore, the concentrate and tailings of positive flotation operation are respectively given to the dehydration operation, and the products in the flotation tank are processed according to the specific tailings. The dehydration process is determined by the ore treatment process. The dehydrated product is positive flotation tailings, and the flotation foam (positive flotation concentrate) is dewatered into positive flotation coarse concentrate;

(5) The filtrate produced by the positive flotation dehydration operation is sent to the positive flotation return water sedimentation tank, and the overflow of the return water sedimentation tank is sent to the alkaline high-level tank, and returned to the positive flotation process through the positive flotation return water system;

(6)) The positive flotation coarse concentrate is fed into the acid leaching operation. After the acid leaching, the dehydration operation is carried out, and the supernatant liquid is returned to the process for use. The dehydrated product is the final phosphate concentrate, and the leaching acid is a mixed acid of sulfuric acid and phosphoric acid. Prepared according to the mass 1:1.

(7) The reverse flotation process consists of a rough selection and a re-selection operation, and the positive flotation consists of a rough selection and a sweep operation.

The ore composition of the high sesquioxide type collophosphate in the above method is that the P ₂ O ₅ grade is 22.81%, the MgO mass content is 3.19%, the SiO ₂ mass content is 18.19%, the Al ₂ O ₃ mass content is 4.21%, and the Fe mass content is 4.21%. The mass content of ₂ O ₃ is 2.14%;

The grade of P ₂ O ₅ obtained in the above method is 33.55%, the mass content of MgO is 0.25%, and the mass content of sesquioxide (R ₂ O ₃ ) is 1.41%.

Embodiment 2, a kind of beneficiation method for processing high sesquioxide collophosphate rock:

(1) After the raw ore is crushed, it is sent to the first stage of grinding and grading operation, and the first stage of grinding fineness is controlled to -200 mesh 55%, and the ground pulp is sent to the reverse flotation operation;

(2) The products in the tank of the reverse flotation operation are dewatered to obtain the reverse flotation coarse concentrate. The dehydration process of the flotation foam (reverse flotation tailings) is determined according to the specific tailings treatment process, and the reverse flotation operation inhibitor is selected. Sulfuric acid, the dosage is 6kg/t raw ore, and the collector is fatty acid soap organic matter, and the dosage is 800g/t raw ore;

(3) The filtrate produced by the reverse flotation dehydration operation is sent to the reverse flotation return water sedimentation tank, and the overflow of the return water sedimentation tank is sent to the acid high-level tank, and returned to the reverse flotation process through the reverse flotation return water system;

(4) The coarse concentrate of reverse flotation is fed into the second-stage grinding and grading operation. The second-stage grinding fineness is controlled to -200 mesh and 86%. The ground pulp is fed into the positive flotation operation, and the positive flotation operation adjuster is selected. Sodium carbonate is used as pH adjuster, the dosage is 2000g/t raw ore, water glass is used as inhibitor of silicate minerals, the dosage is 2000g/t raw ore, polysaccharides and polyphenol organic polymers are used as inhibitors of iron-containing minerals , the dosage is 50g/t raw ore, the collector is fatty acid soap organics, the dosage is 800 g/t raw ore, the concentrate and tailings of positive flotation operation are respectively given to dehydration operation, and the products in the flotation tank are processed according to the specific tailings. The dehydration process is determined by the ore treatment process. The dehydrated product is positive flotation tailings, and the flotation foam (positive flotation concentrate) is dewatered into positive flotation coarse concentrate;

(5) The filtrate produced by the positive flotation dehydration operation is sent to the positive flotation return water sedimentation tank, and the overflow of the return water sedimentation tank is sent to the alkaline high-level tank, and returned to the positive flotation process through the positive flotation return water system;

(6)) The positive flotation coarse concentrate is fed into the acid leaching operation. After the acid leaching, the dehydration operation is carried out, and the supernatant liquid is returned to the process for use. The dehydrated product is the final phosphate concentrate, and the leaching acid is a mixed acid of sulfuric acid and phosphoric acid. Prepared according to the mass 1:1.

(7) The reverse flotation process consists of a rough selection and a re-selection operation, and the positive flotation consists of a rough selection and a sweep operation.

The ore composition of the high sesquioxide type collophosphate in the above method is that the P ₂ O ₅ grade is 23.21%, the MgO mass content is 3.52%, the SiO ₂ mass content is 14.19%, the Al ₂ O ₃ mass content is 4.70%, and the Fe mass content is 4.70%. The mass content of ₂ O ₃ is 2.25%;

The grade of P ₂ O ₅ obtained in the above method is 34.55%, the mass content of MgO is 0.25%, and the mass content of sesquioxide (R ₂ O ₃ ) is 1.29%.

The comparison data of the method of the present invention and the double reverse flotation process of the prior art:

Implementation 3, a kind of beneficiation method for processing high sesquioxide collophosphate rock:

(1) After the raw ore is crushed, it is sent to the first stage of grinding and grading operation, and the first stage of grinding fineness is controlled to -200 mesh 60%, and the ground pulp is sent to the reverse flotation operation;

(2) The products in the tank of the reverse flotation operation are dewatered to obtain the reverse flotation coarse concentrate. The dehydration process of the flotation foam (reverse flotation tailings) is determined according to the specific tailings treatment process, and the reverse flotation operation inhibitor is selected. Sulfuric acid, the dosage is 6kg/t raw ore, and the collector is fatty acid soap organic matter, and the dosage is 900g/t raw ore;

(3) The filtrate produced by the reverse flotation dehydration operation is sent to the reverse flotation return water sedimentation tank, and the overflow of the return water sedimentation tank is sent to the acid high-level tank, and returned to the reverse flotation process through the reverse flotation return water system;

(4) The coarse concentrate of reverse flotation is fed into the second-stage grinding and classification operation. The second-stage grinding fineness is controlled to -200 mesh and 90%. The ground pulp is fed into the positive flotation operation, and the positive flotation operation adjuster is selected. Sodium carbonate is used as pH adjuster, the dosage is 2500g/t raw ore, water glass is used as inhibitor of silicate minerals, the dosage is 2000g/t raw ore, polysaccharides and polyphenol organic polymers are used as inhibitors of iron-containing minerals , the dosage is 70g/t raw ore, the collector is fatty acid soap organic matter, the dosage is 800 g/t raw ore, the concentrate and tailings of positive flotation operation are respectively given to the dehydration operation, and the products in the flotation tank are processed according to the specific tailings. The dehydration process is determined by the ore treatment process. The dehydrated product is positive flotation tailings, and the flotation foam (positive flotation concentrate) is dewatered into positive flotation coarse concentrate;

(5) The filtrate produced by the positive flotation dehydration operation is sent to the positive flotation return water sedimentation tank, and the overflow of the return water sedimentation tank is sent to the alkaline high-level tank, and returned to the positive flotation process through the positive flotation return water system;

(6)) The positive flotation coarse concentrate is fed into the acid leaching operation. After the acid leaching, the dehydration operation is performed, and the supernatant liquid is returned to the process for use. The dehydration product is the final phosphate concentrate, and the leaching acid is sulfuric acid.

(7) The reverse flotation process consists of a rough selection and a re-selection operation, and the positive flotation consists of a rough selection and a sweep operation.

The ore composition of the high sesquioxide type collophosphate in the above method is that the P ₂ O ₅ grade is 23.21%, the MgO mass content is 3.52%, the SiO ₂ mass content is 14.19%, the Al ₂ O ₃ mass content is 4.70%, and the Fe mass content is 4.70%. The mass content of ₂ O ₃ is 2.25%;

The grade of P ₂ O ₅ obtained in the above method is 34.80%, the mass content of MgO is 0.21%, and the mass content of semi-oxide (R ₂ O ₃ ) is 1.23%.

Implementation 4, a kind of beneficiation method for processing high sesquioxide collophosphate rock:

(1) After the raw ore is crushed, it is sent to the first stage of grinding and grading operation. The first stage of grinding fineness is controlled to -200 mesh 65%, and the ground pulp is sent to the reverse flotation operation;

(2) The products in the tank of the reverse flotation operation are dewatered to obtain the reverse flotation coarse concentrate. The dehydration process of the flotation foam (reverse flotation tailings) is determined according to the specific tailings treatment process, and the reverse flotation operation inhibitor is selected. Mixed acid, the dosage is 5kg/t raw ore, and the collector is fatty acid soap organic matter, and the dosage is 850g/t raw ore;

(3) The filtrate produced by the reverse flotation dehydration operation is sent to the reverse flotation return water sedimentation tank, and the overflow of the return water sedimentation tank is sent to the acid high-level tank, and returned to the reverse flotation process through the reverse flotation return water system;

(4) The coarse concentrate of reverse flotation is fed into the second-stage grinding and classification operation. The second-stage grinding fineness is controlled to -200 mesh and 90%. The ground pulp is fed into the positive flotation operation, and the positive flotation operation adjuster is selected. Sodium carbonate is used as pH adjuster, the dosage is 2500g/t raw ore, water glass is used as inhibitor of silicate minerals, the dosage is 2000g/t raw ore, polysaccharides and polyphenol organic polymers are used as inhibitors of iron-containing minerals , the dosage is 70g/t raw ore, the collector is fatty acid soap organic matter, the dosage is 800 g/t raw ore, the concentrate and tailings of positive flotation operation are respectively given to the dehydration operation, and the products in the flotation tank are processed according to the specific tailings. The dehydration process is determined by the ore treatment process. The dehydrated product is positive flotation tailings, and the flotation foam (positive flotation concentrate) is dewatered into positive flotation coarse concentrate;

(5) The filtrate produced by the positive flotation dehydration operation is sent to the positive flotation return water sedimentation tank, and the overflow of the return water sedimentation tank is sent to the alkaline high-level tank, and returned to the positive flotation process through the positive flotation return water system;

(6)) The positive flotation coarse concentrate is fed into the acid leaching operation. After the acid leaching, the dehydration operation is performed, and the supernatant liquid is returned to the process for use. The dehydration product is the final phosphate concentrate, and the leaching acid is sulfuric acid.

(7) The reverse flotation process consists of a rough selection and a re-selection operation, and the positive flotation consists of a rough selection and a sweep operation.

The ore composition of the high sesquioxide type collophosphate in the above method is that the P ₂ O ₅ grade is 23.21%, the MgO mass content is 3.52%, the SiO ₂ mass content is 14.19%, the Al ₂ O ₃ mass content is 4.70%, and the Fe mass content is 4.70%. The mass content of ₂ O ₃ is 2.25%;

The grade of P ₂ O ₅ obtained in the above method is 34.89%, the mass content of MgO is 0.20%, and the mass content of semi-oxide (R ₂ O ₃ ) is 1.22%.

Embodiment 5, a kind of beneficiation method for processing high sesquioxide collophosphate rock:

(1) After the raw ore is crushed, it is sent to the first stage of grinding and grading operation, and the first stage of grinding fineness is controlled to -200 mesh 60%, and the ground pulp is sent to the reverse flotation operation;

(2) The products in the tank of the reverse flotation operation are dewatered to obtain the reverse flotation coarse concentrate. The dehydration process of the flotation foam (reverse flotation tailings) is determined according to the specific tailings treatment process, and the reverse flotation operation inhibitor is selected. Phosphoric acid, the dosage is 5kg/t raw ore, and the collector is fatty acid soap organic matter, and the dosage is 500g/t raw ore;

(3) The filtrate produced by the reverse flotation dehydration operation is sent to the reverse flotation return water sedimentation tank, and the overflow of the return water sedimentation tank is sent to the acid high-level tank, and returned to the reverse flotation process through the reverse flotation return water system;

(4) The rough concentrate of reverse flotation is fed into the second-stage grinding and grading operation, and the second-stage grinding fineness is controlled to -200 mesh and 95%. Sodium carbonate is used as pH adjuster, the dosage is 1500g/t raw ore, water glass is used as inhibitor of silicate minerals, the dosage is 6000g/t raw ore, polysaccharides and polyphenol organic polymers are used as inhibitors of iron-containing minerals , the dosage is 80g/t raw ore, the collector is fatty acid soap organic matter, the dosage is 1500 g/t raw ore, the concentrate and tailings of positive flotation operation are respectively given to dehydration operation, and the products in the flotation tank are processed according to the specific tailings. The dehydration process is determined by the ore treatment process. The dehydrated product is positive flotation tailings, and the flotation foam (positive flotation concentrate) is dewatered into positive flotation coarse concentrate;

(5) The filtrate produced by the positive flotation dehydration operation is sent to the positive flotation return water sedimentation tank, and the overflow of the return water sedimentation tank is sent to the alkaline high-level tank, and returned to the positive flotation process through the positive flotation return water system;

(6)) The positive flotation coarse concentrate is fed into the acid leaching operation. After the acid leaching, the dehydration operation is performed, and the supernatant liquid is returned to the process for use. The dehydration product is the final phosphate concentrate, and the leaching acid is sulfuric acid.

(7) The reverse flotation process consists of a roughing and a re-selection operation, and the positive flotation consists of a roughing, a selection and a sweeping operation.

The ore composition of the high sesquioxide type collophosphate in the above method is that the P ₂ O ₅ grade is 19.75%, the MgO mass content is 1.55%, the SiO ₂ mass content is 34.19%, the Al ₂ O ₃ mass content is 3.79%, and the Fe mass content is 3.79%. The mass content of ₂ O ₃ is 1.92%;

The P ₂ O ₅ grade obtained in the above method is 34.80%, the MgO mass content is 0.21%, and the semi-oxide (R ₂ O ₃ ) mass content is 1.35%.

The method of the present invention and the positive and negative flotation process comparison data of the prior art:

Embodiment 6, a kind of beneficiation method for processing high sesquioxide collophosphate rock:

(1) After the raw ore is crushed, it is sent to the first stage of grinding and grading operation, and the first stage of grinding fineness is controlled to -200 mesh 60%, and the ground pulp is sent to the reverse flotation operation;

(2) The products in the tank of the reverse flotation operation are dewatered to obtain the reverse flotation coarse concentrate. The dehydration process of the flotation foam (reverse flotation tailings) is determined according to the specific tailings treatment process, and the reverse flotation operation inhibitor is selected. Mixed acid, the dosage is 7kg/t raw ore, and the collector is fatty acid soap organic matter, and the dosage is 500g/t raw ore;

(3) The filtrate produced by the reverse flotation dehydration operation is sent to the reverse flotation return water sedimentation tank, and the overflow of the return water sedimentation tank is sent to the acid high-level tank, and returned to the reverse flotation process through the reverse flotation return water system;

(4) The rough concentrate of reverse flotation is fed into the second-stage grinding and grading operation, and the second-stage grinding fineness is controlled to -200 mesh and 95%. Sodium carbonate is used as pH adjuster, the dosage is 2000g/t raw ore, water glass is used as inhibitor of silicate minerals, the dosage is 6000g/t raw ore, polysaccharides and polyphenol organic polymers are used as inhibitors of iron-containing minerals , the dosage is 80g/t raw ore, the collector is fatty acid soap organic matter, the dosage is 1500 g/t raw ore, the concentrate and tailings of positive flotation operation are respectively given to dehydration operation, and the products in the flotation tank are processed according to the specific tailings. The dehydration process is determined by the ore treatment process. The dehydrated product is positive flotation tailings, and the flotation foam (positive flotation concentrate) is dewatered into positive flotation coarse concentrate;

(5) The filtrate produced by the positive flotation dehydration operation is sent to the positive flotation return water sedimentation tank, and the overflow of the return water sedimentation tank is sent to the alkaline high-level tank, and returned to the positive flotation process through the positive flotation return water system;

(6)) The positive flotation coarse concentrate is fed into the acid leaching operation. After the acid leaching, the dehydration operation is performed, and the supernatant liquid is returned to the process for use. The dehydration product is the final phosphate concentrate, and the leaching acid is sulfuric acid.

(7) The reverse flotation process consists of a roughing and a re-selection operation, and the positive flotation consists of a roughing, a selection and a sweeping operation.

The ore composition of the high sesquioxide type collophosphate in the above method is that the P ₂ O ₅ grade is 19.75%, the MgO mass content is 1.55%, the SiO ₂ mass content is 34.19%, the Al ₂ O ₃ mass content is 3.79%, and the Fe mass content is 3.79%. The mass content of ₂ O ₃ is 1.92%;

The P ₂ O ₅ grade obtained in the above method is 34.75%, the MgO mass content is 0.22%, and the semi-oxide (R ₂ O ₃ ) mass content is 1.36%.

Claims (10)

1. A beneficiation method for treating high sesquioxide collophanite is characterized by comprising the following steps: crushing, grinding and grading the raw ore, performing reverse flotation operation, grinding and grading the obtained reverse flotation rough concentrate again, performing direct flotation operation, and performing acid leaching operation on the obtained direct flotation rough concentrate to obtain the final phosphate concentrate.

2. The beneficiation method for treating high sesquioxide collophanite according to claim 1, which is characterized in that: the acid adopted in the acid leaching operation is inorganic strong acid or organic strong acid, the inorganic strong acid is selected from one or more of sulfuric acid, hydrochloric acid, nitric acid and phosphoric acid, and the organic strong acid is selected from one or two of oxalic acid and citric acid.

3. The beneficiation method for treating high sesquioxide collophanite according to claim 1, which is characterized in that: the method is characterized in that two water return tanks and a high-level water tank are separately arranged and are respectively used for storing forward flotation return water and reverse flotation return water, the return water of the forward flotation return tank is only used for forward flotation, the return water of the reverse flotation return tank is only used for reverse flotation, and supernatant water of acid leaching operation is returned to the reverse flotation return tank or returned to the acid leaching operation for use; and the overflow of the water return tank returns to the high-level water tank and then flows into the corresponding process flow automatically.

4. The beneficiation method for treating high sesquioxide collophanite according to claim 1, which is characterized in that: the products in the tank of the reverse flotation operation are not directly fed into the forward flotation operation, but are dehydrated, and the water content of the reverse flotation rough concentrate is controlled to be 10% -16%.

5. The beneficiation method for treating high sesquioxide collophanite according to claim 1, which is characterized in that: the products in the tank of the direct flotation operation are not directly subjected to acid leaching operation, but are subjected to dehydration operation, and the water content of the direct flotation rough concentrate is controlled to be 10% -16%.

6. The beneficiation method for treating high sesquioxide collophanite according to claim 1, which is characterized in that: the grinding fineness of the ore grinding in the reverse flotation operation is 50.00-70.00% of-200 meshes; the grinding fineness of the ore grinding in the direct flotation operation is 80-98% of-200 meshes.

7. The beneficiation method for treating high sesquioxide collophanite according to claim 1, which is characterized in that: the inhibitor of the reverse flotation operation is inorganic acid, the inorganic acid is sulfuric acid, phosphoric acid or mixed acid of the sulfuric acid and the phosphoric acid, and the collecting agent is fatty acid soap organic matter; the positive flotation operation selects sodium carbonate as a pH regulator, water glass as an inhibitor of silicate minerals, polysaccharides and polyphenol organic polymers as an inhibitor of iron-containing minerals, and the collecting agent selects fatty acid soap organic matters.

8. The beneficiation method for treating high sesquioxide collophanite according to claim 1, which is characterized in that: the tailings subjected to the forward flotation and the tailings subjected to the reverse flotation adopt dry pile treatment, tailing pond storage or tailing filling methods according to actual conditions.

9. A beneficiation process for treating high sesquioxide collophanite according to any one of claims 1 to 8, wherein: the method comprises the following steps:

(1) crushing raw ores, feeding the crushed raw ores into a first-stage ore grinding and grading operation, and then feeding the crushed raw ores into a reverse flotation operation;

(2) dehydrating the product in the tank in the reverse flotation operation to obtain reverse flotation rough concentrate, and determining a dehydration process for flotation froth, namely reverse flotation tailings according to a specific tailings treatment process;

(3) the filtrate generated in the reverse flotation dehydration operation is returned to the reverse flotation operation for use;

(4) the reverse flotation rough concentrate is fed into the second-stage grinding classification operation, then fed into the forward flotation operation, the concentrate and the tailings of the forward flotation operation are respectively fed into the dehydration operation, the product in the flotation tank is subjected to a dehydration process determined according to a specific tailing treatment process, the dehydrated product is the forward flotation tailings, and the flotation froth, namely the forward flotation concentrate, is subjected to the dehydration operation to form the forward flotation rough concentrate;

(5) the filtrate generated in the positive flotation dehydration operation is returned to the positive flotation operation for use;

(6) and (3) performing acid leaching on the direct flotation rough concentrate, performing dehydration after acid leaching, returning the supernatant to the process for use, and obtaining a dehydrated product, namely the final phosphate concentrate.

10. The beneficiation method for treating high sesquioxide collophanite according to claim 9, which is characterized in that: the method comprises the following specific steps:

(1) crushing raw ore, feeding the crushed raw ore into a first-stage grinding and grading operation, controlling the fineness of the first-stage grinding to be 50.00-70.00% of-200 meshes, and feeding the ground ore pulp into a reverse flotation operation;

(2) performing dehydration operation on products in a tank in reverse flotation operation to obtain reverse flotation rough concentrates, determining a dehydration process for flotation foams, namely reverse flotation tailings according to a specific tailing treatment process, wherein an inhibitor in the reverse flotation operation selects inorganic acid, the inorganic acid is sulfuric acid, phosphoric acid or mixed acid of the sulfuric acid and the phosphoric acid, the using amount of the inorganic acid and the phosphoric acid is 5 kg/t-9 kg/t of raw ore, and a collecting agent selects fatty acid soap organic matters, and the using amount of the collecting agent is 500 g/t-2000 g/t of raw ore;

(3) filtrate generated in the reverse flotation dehydration operation is fed into a reverse flotation backwater sedimentation tank, overflow of the backwater sedimentation tank is fed into an acidic high-level water tank, and the filtrate is returned to the reverse flotation operation for use through a reverse flotation backwater system;

(4) the reverse flotation rough concentrate is fed into a secondary grinding grading operation, the fineness of secondary grinding is controlled to be 80% -98% of minus 200 meshes, ground ore pulp is fed into a positive flotation operation, sodium carbonate is selected as a pH regulator for the positive flotation operation, the usage amount is 0 g/t-3000 g/t of raw ore, water glass is used as an inhibitor of silicate minerals, the usage amount is 1000 g/t-7000 g/t of raw ore, polysaccharides and polyphenol organic polymers are used as the inhibitor of iron-containing minerals, the usage amount is 30 g/t-500 g/t of raw ore, a collecting agent is selected from fatty acid soap organic matters, the usage amount is 500 g/t-2000 g/t of raw ore, the concentrate and tailings of the positive flotation operation are respectively fed into a dewatering operation, and products in a flotation tank are subjected to a dewatering process determined according to a specific tailing treatment process, the dehydrated product is positive flotation tailings, and flotation foam, namely positive flotation concentrate, is dehydrated to form positive flotation rough concentrate;

(5) filtrate generated in the positive flotation dehydration operation is fed into a positive flotation backwater sedimentation tank, overflow of the backwater sedimentation tank is fed into an alkaline high-level water tank, and the filtrate is returned to the positive flotation process for use through a positive flotation backwater system;

(6) the direct flotation rough concentrate is subjected to acid leaching operation, dehydration operation is carried out after acid leaching, supernatant is returned to the process for use, a dehydrated product is the final phosphate concentrate, the leaching acid is inorganic strong acid or organic strong acid, the inorganic strong acid is one or more of sulfuric acid, hydrochloric acid, nitric acid and phosphoric acid, and the organic strong acid is oxalic acid and/or citric acid.