CN1031925C - Granulating technique of powdered strontium carbonate or barium carbonate - Google Patents
Granulating technique of powdered strontium carbonate or barium carbonate Download PDFInfo
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- CN1031925C CN1031925C CN 91105429 CN91105429A CN1031925C CN 1031925 C CN1031925 C CN 1031925C CN 91105429 CN91105429 CN 91105429 CN 91105429 A CN91105429 A CN 91105429A CN 1031925 C CN1031925 C CN 1031925C
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- barium carbonate
- strontium carbonate
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Abstract
The present invention belongs to a granulating method of inorganic powder. Powder of strontium carbonate and powder of barium carbonate are kneaded in a double spiral kneading machine, the kneaded powder is granulated in a rocking granulating machine, and granular products can be obtained when the granular powder is dried in a shaker drier. The present invention has the advantages of short flow path, simple cooling method, no special shaping or sieving, no high temperature calcination and few return products. The present invention is also suitable for granulating other inorganic powder, such as white carbon black, high test bleaching powder, sodium nitrate, etc.
Description
The invention belongs to the prilling process of inorganic powder, is the prilling process that powdered Strontium carbonate powder and barium carbonate material is processed into particulate materials furtherly.
Along with the raising of commercial production levels, the raising that quality product requires, the raising of environmental protection requirement, the raising of work-yard hygienic standard, some powdery solid products more and more are subjected to user's repulsion.For example, the use of powdered Strontium carbonate powder and barium carbonate raw material has been refused in picture tube industry, and it is granulated product that desired raw material all requires, otherwise can not guarantee the ordinary production of glass furnace charge.
About the prilling process of Strontium carbonate powder and barium carbonate, produce at present and be mainly wet method and two technological lines of dry method.1. processes for wet granulation is to carry out mixing granulation with wet stock and through the dry material that returns after pulverizing, shaping and the screening, then through high-temperature calcination, cooling, again through fragmentation and shaping, after the screening, the material that meets granularity requirements can be packed, and pulverulent material returns granulation again.Processes for wet granulation is at present industrial comparatively popular, but the shortcoming of this method is conspicuous.Processes for wet granulation energy consumption height, the material behind the mixing granulation need be calcined down at 1100～1200 ℃, otherwise product does not reach requirement of strength; Wet process is long, and equipment is many, and operation is also complicated; The returning charge of wet method is many, has therefore also reduced production efficiency.2. non-slurry pelletizing method, be at first wet stock to be carried out drying, mix then with through the dry material that returns after pulverizing, shaping and the screening, add a certain amount of moisture content, the control moisture content, high-pressure extrusion is shaped again, cooling is pulverized and shaping then, after the screening, the material that meets granularity requirements can be packed, and pulverulent material returns extrusion molding again.The non-slurry pelletizing route is with exsiccant material extrusion molding bulk, and well imagining needs powerful pressure, so dry method needs special two roller high-tension apparatuses, pressure needs tens tons, even ton up to a hundred, and material is also wanted special stainless material, facility investment is big, and flow process is also long; Another defective is the same with wet method, and returning charge is many after crushing and screening.
At the existing shortcoming of above-mentioned prilling process, the present invention proposes the prilling process of an improved inorganic powder, thereby overcomes present agglomeration technique long flow path, and it is big not to be equipped with investment, the shortcoming that returning charge is many.
The present invention at first mediates wet stock and the dry material that returns in kneader; perhaps directly dry material being added water mediates in kneader; make material have certain intensity; send into granulation in the tablets press then; the cooling of particulate materials drying can be packed, and exsiccant is collected dust simultaneously and returned the kneading operation.
The present invention is similar with processes for wet granulation, do not need wet stock dry in advance, but be different from processes for wet granulation, the present invention's processes for wet granulation in the past all is that wet stock and dry material are simply mixed, granulation then, the particle of producing like this is non-through high-temperature calcination, and intensity is difficult to reach requirement, so the processes for wet granulation before the present invention need be passed through this operation of high-temperature calcination.The present invention is not so simple mixing, mediates in the kneader shown in accompanying drawing one but wet stock and dry material or dry material are added water.Such kneading not only can be played mixing of materials is acted on uniformly, and material pushed kneading repeatedly, will " loose " material be kneaded into " closely " and material, the granulation again of such material, also has certain intensity without calcining, as long as control the humidity of material, the factors such as time of kneading well, intensity can reach requirement after the particle drying of producing.We know Strontium carbonate powder and barium carbonate material after filtering, and filter cake is moisture generally between 14～30%, regulate according to moisture content the present invention of filter cake to add the dry material amount, and the moisture content that makes material is between 10～18%; When direct use dry material adds water, also to reach such moisture content.The performance of kneading time to material also has certain influence.Time is short, and dried, wet stock mixes inhomogeneous, easily produces " dry powder " during granulation, thereby influences a yield of product, and particle intensity is also relatively poor simultaneously; Time is long, and on the one hand plant factor descends, on the other hand during granulation material easily with the sieve breakage of tablets press.It is considered herein that the suitable kneading time was advisable at 10～30 minutes.
Granulation of the present invention is to carry out in a kind of swing tablets press.In processes for wet granulation, available tablets press kind is a lot, and as garden dish tablets press, the extrusion tablets press squeezes the sheet tablets press, compressing tablet tablets press, two roller Squeezinggranulators etc.The simplyst in multiple tablets press will count garden dish tablets press, but that the shortcoming of this kind type maximum is a size-grade distribution is extremely inhomogeneous, and particle intensity is poor.The tablets press of other several types all needs powerful extrusion force, and material is selected and running steady in a long-term is had any problem.The present invention has considered the character of Strontium carbonate powder and barium carbonate material, and is having the present invention to mediate under the cooperation of technology, has selected the swing tablets press shown in accompanying drawing two for use.The tablets press of this kind pattern relies on oscillating of machine interior " scraping blade ", material " is extruded " from screen cloth, because material in case " being squeezed " goes out promptly to become particulate state, and has certain intensity in advance through kneading fully.Because " scraping blade " is back and forth " wave ", so material is extruded by " intermittently " comparatively speaking,, do not need fragmentation and shaping can obtain the satisfactory particle of granularity as long as be equipped with the screen cloth of suitable order number.
All need behind the material granulating through super-dry.In general, the drying of granule materials generally can be taken off water to the greatest extent at 120 ℃, but because Strontium carbonate powder and barium carbonate material properties determine, in case after the water evaporates, the granulated product that has been shaped again can " efflorescence ", and particle has not been existed, so need to add a high-temperature calcination operation in the present invention's wet method making method art in the past, generally be 1100～1200 ℃ of calcinings, make the partial material fusion, could keep its granulated product that certain intensity is arranged.The present invention has selected suitable batch mixing promptly to mediate condition and granulation mode, does not therefore need can reach the requirement that dehydrates and only need to carry out drying under 270～400 ℃, and can guarantee the intensity of particle through so high temperature calcining.Dry materials of the present invention is to carry out on the drying machine shown in accompanying drawing three.This is a kind of vibrating drier, and hot gas flow and material trend is opposite, and material is under continuous vibration, so hot blast is very easy in the particle gap, and heat exchange is fully, and the speed that dehydrates is also just very fast.Problems such as the material of common vibrating dryer drying as Strontium carbonate powder or barium carbonate " scab, plugging, go out wet feed, dust " are more serious, but under condition of the present invention, use the vibrating dryer shown in the accompanying drawing three of the present invention, these problems have all been solved well.Under drying temperature of the present invention, the residence time of control material is can reach the exsiccant purpose in 5～15 minutes.Hot gas flow constantly feeds and constantly discharges, simultaneously can " efflorescence " material is that dry dust blows out together, the actual effect of having played screening is sieved this operation thereby the present invention has been saved.The dry dust that blows out utilizes cyclonic separator to collect easily, returns then and mediates the use of operation batching.Because drying temperature of the present invention is low, do not need dried material is forced cooling, so the type of cooling is also very simple.The present invention is as long as can pack through simple natural wind cooling.
The present invention is mainly used in the granulation of Strontium carbonate powder and barium carbonate powder, present wet granulation flow process can be shortened, and does not need the high-temperature calcination particle intensity can reach requirement, and dried particle does not need shaping and special screening, and the type of cooling is simple, and the dry powder returning charge is few.The present invention also is applicable to the granulation of other inorganic powder, as pulverulent materials such as white carbon black, high test bleaching powder, SODIUMNITRATE.
Example 1
250 kilograms of the precipitated barium carbonates of moisture content 18%; the dried barium carbonate powder double centner that reclaims; add in the duplex kneader and mediated 30 minutes; material after will mediating is again sent into granulation in the swing tablets press; the particle moisture content of producing about 13% enters the dried device of making of oscillatory type and descended dry 5 minutes at 350 ℃, reclaims 37 kilograms of powders; get 268 kilograms of granulated products, product meets the standard of GB1614-89.
Example 2
With the operation of example 1, batch mixing moisture content 16%, 20 minutes kneading time, 270 ℃ were descended dry 15 minutes again, and yield is with example 1.
Example 3
200 kilograms of the precipitated barium carbonates of moisture content 20% add 140 kilograms of dried barium carbonate powders, and other is operated with example 1, and the result is with example 1.
Example 4
150 kilograms of moisture content 20% precipitation Strontium carbonate powders add 106 kilograms of dry powder Strontium carbonate powders, add 17 kilograms in water, mediated 10 minutes, after the granulation again 400 ℃ dry 5 minutes down, get 203 kilograms of granulated products, 23 kilograms of powders.
Example 5
With the operation of example 4, batch mixing moisture content 12% was mediated 15 minutes, 300 ℃ of following dryings of granulation 20 minutes, and the result is with example 4.
Example 6
300 kilograms of the precipitation Strontium carbonate powders of moisture content 30% add 290 kilograms of dry powder Strontium carbonate powders, mediated 15 minutes, and granulation, drying is 10 minutes under 350 ℃, and the result is with example 4.
Example 7
300 kilograms of precipitated barium carbonate dry powder add 40 kg water, in the duplex kneader, mediated 30 minutes, and granulation, drying is 15 minutes under 280 ℃, and the result is with example 1.
Example 8
216 kilograms of precipitation Strontium carbonate powder dry powder add 24 kilograms in water, mediated 15 minutes, and granulation, drying is 15 minutes under 350 ℃, and the result is with example 4.
Example 9
200 kilograms of the white carbon blacks of moisture content 81%; be dried to 70%; perhaps add the good white carbon black of a certain amount of drying; make it moisture content and also can reach 70%; in the duplex kneader, mediated 20 minutes,, send into and enter drying in the vibrating drier in the swing tablets press after the granulation; obtain 48 kilograms of granulated products, 5 kilograms of powders.
Example 10
200 kilograms of the high test bleaching powders of moisture content 15% add in the duplex kneader and mediated 15 minutes, send into drying in the vibrating drier in swing tablets press after the granulation, get 162 kilograms of granulated products, 8 kilograms of powders.
Example 11
200 kilograms of the SODIUMNITRATE of moisture content 5%, operation get 180 kilograms of granulated products, 10 kilograms of powders with example 10.
The description of the drawings
Accompanying drawing 1: duplex kneader.Material I is added by hopper, by mediating back discharging II.
Accompanying drawing 2: swing tablets press.Add by bucket through the material II after mediating, material is extruded III by " scraping blade ".
Accompanying drawing 3: vibrating drier.By 1. adding, be blown into hot blast through the material III after the granulation simultaneously, material after super-dry through 2. discharging IV of cooling section; Hot blast, is taken away dry dust simultaneously and is entered cyclonic separator by 4. blowing out by 3. being blown into, and dry powder is collected V by lower curtate, and waste gas is discharged by top.
Claims (1)
1. the prilling process of Strontium carbonate powder and barium carbonate powder; it is characterized in that: the wet cake that utilizes Strontium carbonate powder in the production process or barium carbonate; add Strontium carbonate powder or barium carbonate dry powder; perhaps in Strontium carbonate powder or barium carbonate dry material, add water; the add-on of described dry powder or water; all should be controlled at and make mixed material moisture content is 10--18%; in the duplex kneader; wet feed and dry powder or dry powder and water are fully mediated; the control kneading time is 10--30 minute; material is pushed kneading repeatedly; the material of " loose " is kneaded into " closely " material; then by swing tablets press; with material extruding pelletization from screen cloth; by vibrating drier particle is carried out warm air drying more at last; hot gas flow is opposite with the material trend; 270--400 ℃ of control drying temperature scope; the residence time of control material is 5--15 minute; hot gas flow simultaneously will " efflorescence " material is that dry dust blows out together and sieves; the dry dust that blows out utilizes cyclonic separator to collect; return as dry powder and to be used for and wet feed is mediated, dried particle can be packed through cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91105429 CN1031925C (en) | 1991-08-02 | 1991-08-02 | Granulating technique of powdered strontium carbonate or barium carbonate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91105429 CN1031925C (en) | 1991-08-02 | 1991-08-02 | Granulating technique of powdered strontium carbonate or barium carbonate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1069207A CN1069207A (en) | 1993-02-24 |
| CN1031925C true CN1031925C (en) | 1996-06-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91105429 Expired - Fee Related CN1031925C (en) | 1991-08-02 | 1991-08-02 | Granulating technique of powdered strontium carbonate or barium carbonate |
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| Country | Link |
|---|---|
| CN (1) | CN1031925C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117414758B (en) * | 2023-12-15 | 2024-10-22 | 威海沃驰智能技术有限公司 | Liquid methyl benzene benzotriazole granulator |
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1991
- 1991-08-02 CN CN 91105429 patent/CN1031925C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1069207A (en) | 1993-02-24 |
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