CN1069882C - Wet chemical pretreatment process - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 239000000126 substance Substances 0.000 title claims abstract description 22
- 229910001570 bauxite Inorganic materials 0.000 claims abstract description 34
- 238000006243 chemical reaction Methods 0.000 claims abstract description 31
- 239000007788 liquid Substances 0.000 claims abstract description 24
- 238000000926 separation method Methods 0.000 claims abstract description 22
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910001388 sodium aluminate Inorganic materials 0.000 claims abstract description 19
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000004131 Bayer process Methods 0.000 claims abstract description 13
- 239000012141 concentrate Substances 0.000 claims abstract description 13
- 239000011734 sodium Substances 0.000 claims abstract description 9
- 230000035484 reaction time Effects 0.000 claims abstract description 7
- 239000003518 caustics Substances 0.000 claims abstract description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 27
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 24
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 24
- 239000004571 lime Substances 0.000 claims description 24
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 22
- 229910052710 silicon Inorganic materials 0.000 claims description 22
- 239000010703 silicon Substances 0.000 claims description 22
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 18
- 229910052782 aluminium Inorganic materials 0.000 claims description 18
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 10
- 239000007791 liquid phase Substances 0.000 claims description 10
- 239000007790 solid phase Substances 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 9
- 238000011084 recovery Methods 0.000 claims description 7
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 claims description 6
- 229940043430 calcium compound Drugs 0.000 claims description 5
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- 238000002441 X-ray diffraction Methods 0.000 claims description 3
- 239000006227 byproduct Substances 0.000 claims description 3
- 239000007795 chemical reaction product Substances 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 238000001556 precipitation Methods 0.000 claims description 3
- 239000010456 wollastonite Substances 0.000 claims description 3
- 229910052882 wollastonite Inorganic materials 0.000 claims description 3
- 229910052681 coesite Inorganic materials 0.000 claims description 2
- 229910052906 cristobalite Inorganic materials 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 235000012239 silicon dioxide Nutrition 0.000 claims description 2
- 229910052682 stishovite Inorganic materials 0.000 claims description 2
- 229910052905 tridymite Inorganic materials 0.000 claims description 2
- 238000002050 diffraction method Methods 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 238000005191 phase separation Methods 0.000 claims 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 238000003912 environmental pollution Methods 0.000 abstract description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- 235000010755 mineral Nutrition 0.000 description 4
- 239000003513 alkali Substances 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Substances [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000012545 processing Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- -1 silicon-calcium hydrate compound Chemical class 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 229910018125 Al-Si Inorganic materials 0.000 description 1
- 229910018520 Al—Si Inorganic materials 0.000 description 1
- 229910000503 Na-aluminosilicate Inorganic materials 0.000 description 1
- JCCZVLHHCNQSNM-UHFFFAOYSA-N [Na][Si] Chemical compound [Na][Si] JCCZVLHHCNQSNM-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 238000010170 biological method Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910001648 diaspore Inorganic materials 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 229910001679 gibbsite Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000037390 scarring Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000000429 sodium aluminium silicate Substances 0.000 description 1
- 235000012217 sodium aluminium silicate Nutrition 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
本发明涉及提高中低品位铝土矿品位的化学选矿工艺，其主要特征在于：以苛性比。ακ大于80，Na2Ok>250g/L的铝酸钠溶液，反应温度在80～110℃间，反应时间为20～120min，处理中低品位铝土矿，经固液分离后，得到铝硅比大于8的精矿，满足了拜尔法生产氧化铝的要求，简化了工艺条件，降低了能耗和生产成本，减少了对环境的污染，形成了适合处理中低品位铝土矿的化学选矿－拜尔法生产氧化铝新工艺。
The invention relates to a chemical beneficiation process for improving the grade of middle and low-grade bauxite, and its main feature is that the caustic ratio is used. α κ is greater than 80, Na 2 O k >250g/L sodium aluminate solution, the reaction temperature is between 80-110°C, the reaction time is 20-120min, and the middle and low-grade bauxite is processed, and after solid-liquid separation, the obtained Concentrates with an aluminum-silicon ratio greater than 8 meet the requirements of the Bayer process for alumina production, simplify process conditions, reduce energy consumption and production costs, and reduce environmental pollution, forming a suitable medium and low-grade bauxite The new chemical beneficiation-Bayer method to produce alumina.
Description
本发明涉及提高中低品位铝土矿品位的化学选矿工艺。它包括磨矿与预处理、固液分离、除硅、沉铝等步骤。The invention relates to a chemical beneficiation process for improving the grade of middle and low grade bauxite. It includes grinding and pretreatment, solid-liquid separation, silicon removal, aluminum precipitation and other steps.
采用拜尔法生产氧化铝，其工艺流程简单，产品质量好，而且能耗低，各项技术经济指标优良，然而，此法要求铝土矿的铝硅比(A/S)高，必须＞8。为了满足拜尔法对铝土矿铝硅比高的要求，人们研究过采用物理法(如选择性絮凝、浮选、洗选和筛分等)、生物法(如细菌脱硅)、化学法(如高温焙烧预脱硅)处理中低品位铝土矿以提高矿石的铝硅比。这些方法仍处在研究、探索中。Using the Bayer method to produce alumina has simple process flow, good product quality, low energy consumption, and excellent technical and economic indicators. However, this method requires a high aluminum-silicon ratio (A/S) of bauxite, which must > 8. In order to meet the high Al-Si ratio requirements of the Bayer process, people have studied the use of physical methods (such as selective flocculation, flotation, washing and screening, etc.), biological methods (such as bacterial desilication), and chemical methods. (such as high-temperature roasting pre-desilication) to process low-grade bauxite to increase the aluminum-silicon ratio of the ore. These methods are still under research and exploration.
前苏联曾以铝酸钠溶液或纯苛性碱液处理中低品位铝土矿，使含硅矿物分解，铝土矿品位提高。如以低苛性比(αK＜1.7)溶液处理铝土矿，由于其溶液中SiO2浓度低，要得到1吨高品位铝土矿精矿需30m3溶液，且溶液粘度大，固液分离较困难。若以高αK(20左右)，浓碱(450～500g/L Na2OK)溶液处理铝土矿，虽能使铝土矿品位提高，但由于其碱浓度太高，溶液循环困难。为了溶液循环，以上两种方法所得到的含硅铝酸钠溶液都是以生成钠硅渣的方法除去硅，为了回收这种渣中的碱和氧化铝，建议以烧结法或高压水化学法处理之。只是仍未应用实施。The former Soviet Union used sodium aluminate solution or pure caustic lye to treat medium and low-grade bauxite to decompose silicon-containing minerals and improve the grade of bauxite. If bauxite is treated with a solution with a low caustic ratio (α K < 1.7), due to the low concentration of SiO 2 in the solution, 30m 3 solution is required to obtain 1 ton of high-grade bauxite concentrate, and the solution has a high viscosity and solid-liquid separation more difficult. If bauxite is treated with high α K (about 20) and concentrated alkali (450-500g/L Na 2 O K ) solution, although the grade of bauxite can be improved, but because the alkali concentration is too high, the solution circulation is difficult. For solution circulation, the sodium aluminosilicate solution obtained by the above two methods removes silicon by generating sodium-silicon slag. In order to recover the alkali and alumina in this slag, it is recommended to use sintering method or high-pressure hydrochemical method. deal with it. It's just that the implementation hasn't been applied yet.
目前对于中低品位铝土矿采用拜尔--烧结联合法或者烧结法处理。存在流程长、工艺复杂，能耗大，产品质量差，尤其是污染环境等弊端。At present, Bayer-sintering joint method or sintering method is used for middle and low grade bauxite. There are disadvantages such as long process, complex process, high energy consumption, poor product quality, and especially environmental pollution.
本发明的目的是提供一种湿法化学预处理工艺，以提高中低品位铝土矿的铝硅比，满足拜尔法生产氧化铝的要求，同时解决溶液除硅及沉铝的问题，使溶液能循环处理下一批矿石，构成一个循环系统，形成完整的湿法化学选矿--拜尔法生产氧化铝新工艺。The purpose of the present invention is to provide a wet chemical pretreatment process to improve the aluminum-silicon ratio of low- and medium-grade bauxite, meet the requirements of the Bayer process for producing alumina, and simultaneously solve the problems of silicon removal and aluminum precipitation in the solution, so that The solution can circulate and process the next batch of ore, forming a circulation system and forming a complete wet chemical mineral processing - a new process for producing alumina by Bayer process.
本发明为达到上述目的采用的主要技术方案是：The main technical scheme that the present invention adopts for achieving the above object is:
(1)铝土矿的预处理过程：以αK大于80,Na2OK＞250g/L的铝酸钠溶液，反应温度在80～110℃间，反应时间为20～120min，预处理的液固比大于8，处理铝硅比4～7的中低品位铝土矿，经固液分离后，所得固相为高铝硅比的精矿，送拜尔法系统。(1) Pretreatment process of bauxite: use sodium aluminate solution with α K greater than 80, Na 2 O K >250g/L, the reaction temperature is between 80-110°C, the reaction time is 20-120min, the pretreated The liquid-solid ratio is greater than 8, and the middle and low-grade bauxite with an aluminum-silicon ratio of 4-7 is processed. After solid-liquid separation, the solid phase obtained is a concentrate with a high aluminum-silicon ratio, which is sent to the Bayer process system.
(2)溶液的除硅过程：固液分离后的液相为含硅的铝酸钠溶液，溶液在大于100℃时，按分子比CaO/SiO2为1.0～2.0加入石灰，时间为20～120min，反应后固液分离，固相为不含铝的水合硅钙化合物。经洗涤后可得副产品--硅灰石排出系统。(2) The desiliconization process of the solution: the liquid phase after solid-liquid separation is a silicon-containing sodium aluminate solution. When the solution is greater than 100°C, add lime according to the molecular ratio CaO/SiO 2 of 1.0 to 2.0, and the time is 20 to 20. After 120 minutes, the solid and liquid were separated after the reaction, and the solid phase was aluminum-free silicon-calcium hydrate compound. After washing, the by-product - wollastonite discharge system can be obtained.
(3)溶液中铝的回收过程：除去硅后的溶液，加入石灰后，使铝转化为水合铝酸钙沉淀，将其送入拜尔法系统可代替石灰，同时回收铝。溶液在小于90℃时，按分子比CaO/Al2O3大于2.5加入石灰，反应时间为不小于2h，固相为水合铝酸钙，液相为αK大于80的铝酸钠溶液，固液分离后溶液可用于循环处理下一批矿石。(3) The recovery process of aluminum in the solution: the solution after removing silicon, after adding lime, the aluminum is converted into calcium aluminate hydrate and precipitated, which can be sent to the Bayer process system to replace the lime and recover aluminum at the same time. When the solution is less than 90°C, add lime according to the molecular ratio CaO/Al 2 O 3 greater than 2.5, the reaction time is not less than 2h, the solid phase is calcium aluminate hydrate, and the liquid phase is sodium aluminate solution with α K greater than 80. After liquid separation, the solution can be used for recycling to process the next batch of ore.
本发明的积极效果得到了如下的充分体现：Positive effect of the present invention has obtained following full embodiment:
采用纯湿法化学预处理工艺，提高了中低品位铝土矿矿石铝硅比，满足了拜尔法生产氧化铝的要求，简化了工艺条件，大大降低了能耗，降低了生产成本，降低了对环境的污染。且大部分硅在高压溶出前排出拜尔法系统，不仅可废物利用，还减少了结疤，减少了拜尔系统的物流量，形成了适合处理中低品位铝土矿的化学选矿--拜尔法生产氧化铝新工艺。同时也将有利于赤泥的进一步利用，为铝土矿其它开发利用(如：一水硬铝石矿石直接熔盐电解生产合金)创造了条件。The use of pure wet chemical pretreatment technology improves the aluminum-silicon ratio of medium and low-grade bauxite ores, meets the requirements of the Bayer process for alumina production, simplifies the process conditions, greatly reduces energy consumption, reduces production costs, and reduces pollution to the environment. And most of the silicon is discharged from the Bayer process system before high-pressure dissolution, which can not only be used as waste, but also reduce scarring, reduce the material flow of the Bayer system, and form a chemical beneficiation suitable for processing low- and medium-grade bauxite--Bayer A new process for the production of alumina. At the same time, it will also benefit the further utilization of red mud, and create conditions for other development and utilization of bauxite (such as: direct molten salt electrolysis of diaspore ore to produce alloy).
下面结合附图作进一步的描述：Further description is made below in conjunction with accompanying drawings:
附图为湿法化学预处理中低品位铝土矿的化学选矿工艺流程图。The accompanying drawing is a flow chart of the chemical beneficiation process for wet chemical pretreatment of low-grade bauxite.
附图描述了湿法化学预处理中低品位铝土矿的化学选矿工艺的全过程。它的步骤为：The accompanying drawing describes the whole process of the chemical beneficiation process of wet chemical pretreatment of low-grade bauxite. Its steps are:
①铝土矿预处理过程--包括磨矿、预处理和固液分离：利用含硅矿物和一水铝石与碱液反应的差异性，使中低品位矿石(A/S4～7)中含硅矿物分解，以αK大于80,Na2OK＞250g/L的铝酸钠溶液，在反应温度80～110℃之间，时间为20～120min，预处理的液固比大于8，经固液分离后，所得固相为铝硅比大于8.5的精矿，送拜尔法系统。①Bauxite pretreatment process--including grinding, pretreatment and solid-liquid separation: using the difference in the reaction between silicon-containing minerals and gibbsite and lye, the medium and low-grade ores (A/S4～7) For the decomposition of silicon-containing minerals, the sodium aluminate solution with α K greater than 80 and Na 2 O K greater than 250g/L is used at a reaction temperature of 80-110°C for 20-120 minutes, and the liquid-solid ratio of the pretreatment is greater than 8. After solid-liquid separation, the obtained solid phase is a concentrate with an aluminum-silicon ratio greater than 8.5, which is sent to the Bayer process system.
②溶液的除硅过程：固液分离后的液相为含硅的铝酸钠溶液，溶液在大于100℃时，按分子比CaO/SiO2为1.0～2.0加入石灰，时间为20～120min，反应后固液分离，固相为不含铝的水合硅钙化合物。经洗涤后可得副产品--硅灰石排出系统。②Silicon removal process of the solution: the liquid phase after solid-liquid separation is a sodium aluminate solution containing silicon. When the solution is greater than 100°C, add lime according to the molecular ratio CaO/SiO 2 of 1.0-2.0, and the time is 20-120min. After the reaction, the solid and liquid are separated, and the solid phase is aluminum-free silicon calcium hydrate compound. After washing, the by-product - wollastonite discharge system can be obtained.
③溶液中铝的回收过程：除去硅后的溶液，加入石灰后，使铝转化为水合铝酸钙沉淀，将其送入拜尔法系统可代替石灰，同时回收铝。溶液在小于90℃时，按分子比CaO/Al2O3大于2.5加入石灰，反应时间为不小于2h，固相为水合铝酸钙，液相为αK大于80的铝酸钠溶液，固液分离后溶液可用于循环处理下一批矿石。③The recovery process of aluminum in the solution: the solution after removing silicon, after adding lime, the aluminum is converted into calcium aluminate hydrate and precipitated, which can be sent to the Bayer process system to replace the lime and recover aluminum at the same time. When the solution is less than 90°C, add lime according to the molecular ratio CaO/Al 2 O 3 greater than 2.5, the reaction time is not less than 2h, the solid phase is calcium aluminate hydrate, and the liquid phase is sodium aluminate solution with α K greater than 80. After liquid separation, the solution can be used for recycling to process the next batch of ore.
从而也就形成一个完整的高效的预处理中低品位铝土矿的湿法化学选矿--拜尔法生产氧化铝工艺。Thus, a complete and efficient wet chemical beneficiation of pretreatment of low-grade bauxite - Bayer process for alumina production is formed.
实施例：Example:
实施例1：Example 1:
①铝土矿的化学预处理：选用铝土矿，其铝硅比A/S4.7，其中-200目大于80％，以Na2OK 300g/L,Al2O3为1.92g/L的铝酸钠溶液处理，液固比为10，反应温度为95℃，反应50min，经固液分离后，得到精矿的铝硅比A/S9.65；①Chemical pretreatment of bauxite: select bauxite, its aluminum-silicon ratio is A/S4.7, of which -200 mesh is greater than 80%, and Na 2 O K is 300g/L, Al 2 O 3 is 1.92g/L treated with sodium aluminate solution, the liquid-solid ratio is 10, the reaction temperature is 95°C, and the reaction is 50 minutes. After solid-liquid separation, the aluminum-silicon ratio of the concentrate is A/S9.65;
或者选用反应温度100℃，反应30min后，得到精矿的A/S为9.97；Alternatively, the reaction temperature is 100°C, and after 30 minutes of reaction, the A/S of the concentrate is 9.97;
②溶液的除硅过程：固液分离后的液相，即含硅的铝酸钠溶液，按分子比CaO/SiO21.51配石灰，在180℃下，反应60min后，反应产物经X-射线衍射分析表明为硅钙化合物，溶液中的SiO2仅为0.603g/L，而铝不损失；②Silicon removal process of the solution: the liquid phase after solid-liquid separation, that is, the sodium aluminate solution containing silicon, is mixed with lime according to the molecular ratio CaO/SiO 2 1.51, and reacted at 180°C for 60 minutes, and the reaction product is detected by X-ray Diffraction analysis shows that it is a silicon-calcium compound, and the SiO2 in the solution is only 0.603g/L, but the aluminum is not lost;
③溶液中铝回收过程：对除硅后的剩余溶液，按分子比CaO/Al2O3为3配石灰，在50℃时，反应8h后，溶液中Al2O3为2.08g/L，反应10h后溶液中Al2O3为1.925g/L；③Aluminum recovery process in the solution: For the remaining solution after silicon removal, the molecular ratio CaO/Al 2 O 3 is 3 with lime, at 50°C, after 8 hours of reaction, the Al 2 O 3 in the solution is 2.08g/L, After 10 hours of reaction, Al 2 O 3 in the solution was 1.925g/L;
或者按分子比CaO/Al2O3为4配石灰，同样条件下反应8h，溶液中Al2O3为0.65g/L。Or according to the molecular ratio CaO/Al 2 O 3 is 4 coordination lime, react for 8 hours under the same conditions, and the Al 2 O 3 in the solution is 0.65g/L.
实施例2：Example 2:
①铝土矿的化学预处理：选用铝土矿的A/S5.7，其中-200目大于80％，以Na2OK 300g/L,Al2O3为1.4g/L的铝酸钠溶液处理，液固比为10，反应温度100℃，反应45min，经固液分离后，得到精矿的A/S为14.48；①Chemical pretreatment of bauxite: choose bauxite A/S5.7, of which -200 mesh is greater than 80%, Na 2 O K 300g/L, Al 2 O 3 is 1.4g/L sodium aluminate Solution treatment, the liquid-solid ratio is 10, the reaction temperature is 100°C, and the reaction is 45 minutes. After solid-liquid separation, the A/S of the concentrate is 14.48;
或者选用反应温度95℃，反应65min后，得到精矿的A/S为14.26；Alternatively, the reaction temperature is 95°C, and after 65 minutes of reaction, the A/S of the concentrate is 14.26;
②溶液的除硅过程：固液分离后的液相，即含硅的铝酸钠溶液，按分子比CaO/SiO2 1.51配石灰，在180℃下，反应60min后，反应产物经X-射线衍射分析表明为硅钙化合物，溶液中SiO2仅为0.603g/L，而铝不损失；②Silicon removal process of the solution: the liquid phase after solid-liquid separation, that is, the sodium aluminate solution containing silicon, is mixed with lime according to the molecular ratio CaO/SiO 2 1.51, and reacted at 180°C for 60 minutes, and the reaction product is detected by X-ray Diffraction analysis shows that it is a silicon-calcium compound, and the SiO 2 in the solution is only 0.603g/L, but the aluminum is not lost;
③溶液中铝回收过程：对除硅后的剩余溶液，按分子比CaO/Al2O3为3配石灰，在50℃时，反应8h，溶液中Al2O3为2.08g/L，反应10h后溶液中Al2O3 1.925g/L；③Aluminum recovery process in the solution: For the remaining solution after silicon removal, the molecular ratio CaO/Al 2 O 3 is 3 with lime, at 50°C, react for 8 hours, the Al 2 O 3 in the solution is 2.08g/L, the reaction After 10h, Al 2 O 3 in the solution was 1.925g/L;
或者按分子比CaO/Al2O3为4配石灰，同样条件下反应8h，溶液中Al2O3为0.65g/L。Or according to the molecular ratio CaO/Al 2 O 3 is 4 coordination lime, react for 8 hours under the same conditions, and the Al 2 O 3 in the solution is 0.65g/L.
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| CN100441708C (en) * | 2007-05-31 | 2008-12-10 | 中国铝业股份有限公司 | A kind of stripping method of diaspore type bauxite |
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| CN102070166B (en) * | 2010-12-15 | 2012-10-10 | 中国铝业股份有限公司 | Improved method for producing aluminium oxide by medium-low-grade bauxite |
| CN102328943A (en) * | 2011-06-21 | 2012-01-25 | 中国铝业股份有限公司 | Comprehensive utilization method of aluminum-containing minerals |
| CN102730725A (en) * | 2012-06-21 | 2012-10-17 | 中国铝业股份有限公司 | Method for improving caustic ratio of Barer process seeded precipitation mother solution |
| CN106032285B (en) * | 2015-03-13 | 2017-10-03 | 中国石油化工股份有限公司 | A kind of recovery method of aluminum oxide |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4483830A (en) * | 1981-09-10 | 1984-11-20 | Comalco Limited | Production of alumina |
| CN1005251B (en) * | 1987-04-10 | 1989-09-27 | 河北农业大学 | Metallographic sample polishing machine |
| CN1045254A (en) * | 1989-01-31 | 1990-09-12 | 艾尔坎国际有限公司 | From improving one's methods of bauxite into alumina |
| CN1017188B (en) * | 1988-06-01 | 1992-06-24 | 哈特曼·布劳恩有限公司 | Calibration device of non-dispersive infrared photometer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4483830A (en) * | 1981-09-10 | 1984-11-20 | Comalco Limited | Production of alumina |
| CN1005251B (en) * | 1987-04-10 | 1989-09-27 | 河北农业大学 | Metallographic sample polishing machine |
| CN1017188B (en) * | 1988-06-01 | 1992-06-24 | 哈特曼·布劳恩有限公司 | Calibration device of non-dispersive infrared photometer |
| CN1045254A (en) * | 1989-01-31 | 1990-09-12 | 艾尔坎国际有限公司 | From improving one's methods of bauxite into alumina |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100441708C (en) * | 2007-05-31 | 2008-12-10 | 中国铝业股份有限公司 | A kind of stripping method of diaspore type bauxite |
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