CN1024177C - Novel method for producing aluminum hydroxide - Google Patents
Novel method for producing aluminum hydroxide Download PDFInfo
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- CN1024177C CN1024177C CN90110019.6A CN90110019A CN1024177C CN 1024177 C CN1024177 C CN 1024177C CN 90110019 A CN90110019 A CN 90110019A CN 1024177 C CN1024177 C CN 1024177C
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- lime
- kiln
- sintering
- leaching
- coal
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- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 title claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 title abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 72
- 238000005245 sintering Methods 0.000 claims abstract description 60
- 239000004571 lime Substances 0.000 claims abstract description 39
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 38
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 38
- 238000002386 leaching Methods 0.000 claims abstract description 16
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 10
- 239000004411 aluminium Substances 0.000 claims abstract description 8
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 5
- 229910021502 aluminium hydroxide Inorganic materials 0.000 claims description 18
- 239000000243 solution Substances 0.000 claims description 17
- 239000003245 coal Substances 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 9
- 239000007921 spray Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 3
- 235000011089 carbon dioxide Nutrition 0.000 claims description 3
- 239000003034 coal gas Substances 0.000 claims description 3
- 239000010413 mother solution Substances 0.000 claims description 2
- 238000004064 recycling Methods 0.000 claims description 2
- 239000002994 raw material Substances 0.000 abstract description 15
- 239000000843 powder Substances 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 4
- 238000010000 carbonizing Methods 0.000 abstract description 4
- 238000002156 mixing Methods 0.000 abstract description 4
- 238000010521 absorption reaction Methods 0.000 abstract description 3
- 238000005507 spraying Methods 0.000 abstract description 3
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052593 corundum Inorganic materials 0.000 abstract 1
- 238000009776 industrial production Methods 0.000 abstract 1
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 1
- 238000003763 carbonization Methods 0.000 description 17
- 239000011734 sodium Substances 0.000 description 13
- 238000005406 washing Methods 0.000 description 13
- 239000000047 product Substances 0.000 description 10
- HUAUNKAZQWMVFY-UHFFFAOYSA-M sodium;oxocalcium;hydroxide Chemical compound [OH-].[Na+].[Ca]=O HUAUNKAZQWMVFY-UHFFFAOYSA-M 0.000 description 10
- 238000004131 Bayer process Methods 0.000 description 8
- 239000011449 brick Substances 0.000 description 8
- 229910018626 Al(OH) Inorganic materials 0.000 description 7
- 229910001570 bauxite Inorganic materials 0.000 description 6
- 239000002893 slag Substances 0.000 description 6
- 238000001914 filtration Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 238000010298 pulverizing process Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- 239000005864 Sulphur Substances 0.000 description 4
- 239000003513 alkali Substances 0.000 description 4
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 229910001388 sodium aluminate Inorganic materials 0.000 description 4
- 239000000725 suspension Substances 0.000 description 4
- 239000004566 building material Substances 0.000 description 3
- 239000000571 coke Substances 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 239000012452 mother liquor Substances 0.000 description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 235000017550 sodium carbonate Nutrition 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 2
- KMWBBMXGHHLDKL-UHFFFAOYSA-N [AlH3].[Si] Chemical compound [AlH3].[Si] KMWBBMXGHHLDKL-UHFFFAOYSA-N 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000404 calcium aluminium silicate Substances 0.000 description 1
- 238000005255 carburizing Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 229910001648 diaspore Inorganic materials 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005649 metathesis reaction Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 230000001698 pyrogenic effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
- C01F7/14—Aluminium oxide or hydroxide from alkali metal aluminates
- C01F7/141—Aluminium oxide or hydroxide from alkali metal aluminates from aqueous aluminate solutions by neutralisation with an acidic agent
- C01F7/142—Aluminium oxide or hydroxide from alkali metal aluminates from aqueous aluminate solutions by neutralisation with an acidic agent with carbon dioxide
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/16—Preparation of alkaline-earth metal aluminates or magnesium aluminates; Aluminium oxide or hydroxide therefrom
- C01F7/18—Aluminium oxide or hydroxide from alkaline earth metal aluminates
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
A novel method for producing aluminum hydroxide by mixing and sintering lime powder and aluminum ore powder. The method is that lime powder and aluminium ore powder are mixed according to a certain proportion to make into block form, then placed in tunnel kiln, ring kiln or down-draft kiln, and sintered by external coal-feeding at a certain temp. to obtain the invented calcium aluminate clinker (CaO. Al)2O3) Leaching with sodium carbonate, and carbonizing the leaching solution by spraying self-absorption to separate out A1(OH)3. Compared with the known technology, the method is used for preparing the total Al2O3High yield, low raw material consumption, low energy consumption, simple equipment, easy technology, low investment, quick effect and easy industrial production.
Description
The invention belongs to a kind of processing method of production of aluminum hydroxide.It is a kind of improved lime sinter process.This method is suitable for handling bauxite and produces chemical grade and metallurgical grade aluminium hydroxide.
Traditional lime sinter process is to compare CaO/Al with the high-silica diaspore ore (or clay) of low alumina silica ratio and lime (or Wingdale) by calcium
2O
3=12/7 the batching, through grinding, the system ball after in rotary kiln sintering, sinter Na
2CO
3The solution normal pressure leaches, and uses the carbonic acid gas carbonating of lime-kiln gas afterwards, separates out Al(OH)
3The mass flow of this method is big, Al
2O
3Total output capacity low, facility investment is big, the cost height rests on the pilot-plant test stage always.
Document CN1010578B discloses a kind of production aluminium hydroxide processing method, this method is a kind of Wingdale (lime) sintering process that is suitable for the high aluminium silicon ratio bauxite to produce hydroted alumina, this method is with bauxite and the Wingdale or the lime of high aluminium silicon ratio (A/S＞8), separated pulverizing compares CaO/Al by calcium below 60 orders
2O
3=1-2.0 mix adds sintering in the burning kiln behind the system ball, its temperature is 1200-1450 ℃, uses Na afterwards
2CO
3The solution normal pressure leaches, and carries out " carbonating fully " again.
Traditional lime sinter process and the disclosed lime sinter process of document CN1010578B all are a kind of system sphere sintering technologies, sintering kiln must be a kind of rotary kiln or vertical shaft kiln that is applicable to sintering spheroid material, sintering processing is a successive fluidization sintering processing, and there is following problem in the system sphere sintering technology: 1, facility investment is big; 2, easily cause sticking furnace wall and knot bulk phenomenon, bring unfavorable and cause sinter sintering inequality, occur leaking and burn and serious problems such as underburnt to production; 3, make fuel with coal, pit ash must mix among the sintered material, changed the ratio of each chemical ingredients in the former batching, not only can influence each composition of sinter reacts to each other temperature required, and can change chemical crystal structure in the sintered clinker, influence the solubility rate of aluminum oxide, also make operation thing amount increase in the production simultaneously; 4, make fuel with coal, sulphur in the coal must carry out chemical reaction with raw material, and the compound of the various sulphur of generation enters among the sintered material, not only can cause the alkaline consumption of producing aluminium hydroxide to strengthen, also can cause the solid-liquid separation difficulty in the production, have a strong impact on the alumina product quality simultaneously.
The objective of the invention is to produce the problems referred to above of aluminium hydroxide, provide a kind of lime sinter process of clamp dog sintering process to produce aluminium hydroxide in order to overcome former lime sinter process.
The present invention is achieved in that lime (or Wingdale) and aluminium ore is pressed CaO and Al
2O
3Molecular ratio be the 1-1 batch mixes after, more than smashing fineness to 150 order, add water and make brick-shaped material piece, in tunnel furnace, annular kiln or down-draft kiln with external putting-in coal or coal gas at 1250-1450 ℃ of following sintering, with the leaching of 150 grams per liter sodium carbonate solutions, its dissolution fluid solid-to-liquid ratio is 1: 5 to the sintered clinker piece after crushed, extraction temperature is 80-95 ℃, time is 30 minutes, and leaching liquid carries out carbonating with the carbonic acid gas that sprays the self-priming lime-kiln gas, separates out Al(OH)
3, Recycling Mother Solution is used.
Through our research, think that former lime sinter process thing amount flow is big, the reason that output capacity is low is that the improper and sintered material of sintering method does not find suitable proportioning.We think that lime and Bauxite Sintering are to form a series of mCaO, nAl
2O
3Gu fusant, is found behind the sintering of preparing burden with m=n the sinter that obtains finite concentration (150g/L) Na with lime and aluminium ore sintering under 1250-1450 ℃ of high temperature
2CO
3The solution leaching can obtain the Al more than 90%
2O
3Total output capacity has improved nearly one times than the total output capacity of lime sinter process in the past, and new improved lime sinter process is produced the thing amount and descended greatly, and with after yellow soda ash leaching and the carbonization circulation, the rate of loss of alkali is few, produces aluminium hydroxide Na per ton
2CO
3Consumption can be below 50 kilograms.
Simultaneously sintering and carbonization technique method have been done innovation, sintering is not to carry out in the rotary kiln of the big equipment complexity of investment, but raw material is made brick shapes, carries out sintering with the building materials same way as of baking bricks in tunnel furnace, annular kiln, down-draft kiln.Carbonization technique is with spraying CO in the self-priming lime-kiln gas
2Carry out carbonization, thereby make the equipment of producing aluminium hydroxide simple, investment is saved.Put into practice verified, producing aluminium hydroxide with this new process not only invests little, and from total raw material consumption, energy consumption, alkaline consumption, process cost are all low, improved lime sintering new process has not only been pushed to the commercial production scale stage to lime sinter process, and entered Bayer process and the comparable advanced level of soda-lime sintering process with industrial extensive employing, thereby, little factory broken a new approach for producing aluminium hydroxide.
This new process is produced aluminium hydroxide and is divided sintering, leaching, carbonization three phases, and the principle and the flow process in each stage are as follows:
1. sintering stage
Sintering be with aluminium ore and lime after crushed by CaO: Al
2O
3Molecular ratio is to carry out mixing after make brick shapes thing at 1: 1, carry out sintering then in tunnel furnace that building materials are baked bricks or annular kiln, the raw material fragment of brick is unworthy of feed coal, and sintering is to throw bunker coal (or coal gas) outside to carry out in certain high temperature fully, raw material behind sintering, Al
2O
3Form a kind of successive solid solution compound mCaOnAl with CaO
2O
3, sinter enters the leaching stage after crushed.
2. leaching stage
Sinter after the pulverizing leaches with finite concentration soda ash liquid, utilizes the metathesis chemical reaction, generates the CaCO of indissoluble
3Precipitation is with the Al in the solid solution compound
2O
3Form NaAlO
2Enter solution, its reaction formula is as follows:
mCaO·nAl
2O
3+mNa
2CO
3＝2nNaAlO
2+mCaCO
3↓
Find that through experiment when the m=n in the soluble solids, above-mentioned reaction will quantitatively be carried out, thereby obtains Al to the right
2O
3Very high output capacity.
3. carbonation stage
Leach the NaAlO of back gained
2Solution feeds CO
2, make its Al(OH)
3Precipitation is separated out the Na that regenerates simultaneously
2CO
3, Na
2CO
3Mother liquor can be recycled again, and its carburizing reagent formula is as follows:
2NaAlO
2+CO
2+3H
2O＝2Al（OH）
3↓+Na
2CO
3
Now the carbonization technique of using on the technology is to use the expense height, the CO in the big compressor compresses lime-kiln gas of energy consumption
2In sodium aluminate solution.This new process is to adopt at certain high-order injector of installing, with pump with NaAlO
2Solution is with certain pressure, flow input, to spray the CO in the self-priming lime-kiln gas
2Carbonization, its carbonization mainly are to carry out CO in pipe conveying procedure
2Specific absorption is higher than compressor compresses CO
2Specific absorption.The facility investment expense of novel process only quite about 1/10th of the compressor investment cost, and equipment is convenient to management and maintenance.Promptly 1 kiln gas that comes out 2 enters once washing device 3 from the limestone kiln for this law carbonization technique flow process such as Fig. 1, kiln gas 4 behind the once washing enters secondary washing device 5, kiln gas 6 after secondary washing enters injector 7, mix with leaching liquid, by recycle pump 10 leaching liquid 8 is pumped into injector 7, flow into carbonization groove 9 again, the reciprocation cycle carbonization, about sodium aluminate is carbonized 90% till.
Find that through test in carbonization process, jet orifice and inner-walls of duct have scale formation, for this reason, injector and pipe applications plastics and acid and alkali-resistance material are made, and are convenient to pickling.
The characteristics of this novel method
1. this law is to belong to improved lime sinter process, and it and former lime sinter process dissimilarity are: former lime sinter process is by generating 12CaO7Al
2O
3The sintering of preparing burden is used Na
2CO
3Liquid leaches Al
2O
3With last total output Al
2O
3Efficient is all low, the a large amount of desiliconization slag of output in the flow process of former lime sinter process of while, in order to reclaim alkali and the aluminium in the white residue, desiliconization slag must return the sintering again of preparing burden, valuable mineral is except that calcium aluminate in the grog, also have sodium aluminate, this is lime and alkali-lime mixed-sintering method in fact still, and this lime sinter process novel process is by CaO and Al
2O
3Molecular ratio is that 1: 1 batching generates CaOAl
2O
3Gu fusant, its Al
2O
3Solubility rate and total output capacity improve nearly one times than former lime sinter process, reach more than 90%, thing amount flow is significantly reduced, make lime sinter process enter commercial production levels, simultaneously its Al
2O
3Total output capacity, raw materials consumption, energy consumption all can be compared see the following form (table sees the literary composition back) with Bayer process with soda-lime sintering process with tooling cost
2. Bayer process is produced aluminium hydroxide needs the molten device of High Temperature High Pressure, soda-lime sintering process and former lime sinter process all must be carried out sintering in widely different rotary kiln, and being sintering, the distinguishing feature of the sintering method of this law in widely different rotary kiln, do not carry out, but being made brick shapes thing and the building materials identical method of piece of baking bricks, raw material in tunnel furnace or annular kiln or down-draft kiln, carries out sintering, alkali is sintering in pyrogenic process not, therefore alkaline consumption is low, these kiln type equipment are all simple, facility investment is the most honest and the cleanest, simultaneously simple to operate, be convenient to management, the sinter quality is stable, Al
2O
3Total output capacity height, its slag also is easy to filter and washing.
3. this law grog sintering method is that coal is not mixed in the raw material, and carry out sintering with external putting-in coal, therefore eliminate in the coal sulphur to the harm of production of aluminum hydroxide, thereby the various common coal that sintering coal available rates is cheap, needn't use doctor negative metallurgical coke, and soda-lime sintering process or former lime sinter process all must be made fuel with low sulphur coal (S%＜1%) or metallurgical coke.Soda-lime sintering process is at widely different rotary kiln SINTERING PRODUCTION Al per ton simultaneously
2O
3The consumption metallurgical coke is generally about 500 kilograms, and this law sintering in annular kiln and tunnel furnace is produced Al per ton
2O
3Sintering consumes common coal only about 200 kilograms.
4. this law adopts and sprays self-priming kiln gas carbonization technique, and its carbonization mainly is to carry out CO in pipeline
2Be convenient to absorb, its carbonation rate height, facility investment simultaneously is few, and the carbonization power consumption is low.The carbonizing apparatus investment of same ability, spraying self-priming carbonizing apparatus expense only is about 1/10th of compression carbonizing apparatus.
5. because this law adopts that former material is made in the annular kiln of brick-shaped thing or the tunnel furnace sintering method and sprayed the self-priming carbonization technique, make total facility investment expense of producing aluminium hydroxide greatly reduce with this law.The installation cost of Bayer process and soda-lime sintering process is produced the ton investment per year and is about 5,000 yuan/ton to 10,000 yuan/ton, and it only is 1/5th to 1/10th of Bayer process or soda-lime sintering process that the annual output ton investment of this law is about 1,000 yuan/ton to 2,000 yuan/ton.
6. the scale of founding the factory of Bayer process and soda-lime sintering process must be built and be produced Al per year
2O
350,000 tons of above factories of scale could obtain remarkable economic efficiency, therefore big with Bayer process and the soda-lime sintering process scale of founding the factory, investment is big, cycle is long, be difficult to start, this law is produced aluminium hydroxide or aluminum oxide, because technology is simple, equipment is also simple, less investment, cycle is short, just can obtain remarkable economic efficiency as long as build the little factory that produces per year more than 1 kiloton, the scale of founding the factory is changeable, particularly can transform the small cement plant of more existing stopping productions, little chemical plant, little Bricks and Tiles Plant produces aluminium hydroxide.Simultaneously because small scale, invest for a short time, factory can be accomplished near some little aluminum mines, the squat that the inconvenience exploitation of big factory utilizes is done in utilization, from making rational use of resources, the material of gathering materials on the spot all is beneficial to, and is particularly suitable for some township and village enterprises and does the factory that produces aluminium hydroxide.
Embodiment:
As Fig. 2, aluminium ore 1 and lime 2 are pressed CaO and Al
2O
3Molecular ratio was prepared burden the SiO in the aluminium ore in the scope in 1: 1 to 1.1: 1
2, Fe
2O
3, TiO
2Proportion scale Deng impurity and CaO is undertaken by the lime sintering method, does not add bunker coal in the raw material.The compound for preparing enters pulverizing 3 and is crushed to more than 150 orders.Powder 4 after the pulverizing enters evenly mixing device 5.Raw material 6 behind the mixing enter clamp dog operation 7, and powder is admixed less water (generally press raw material about 15%), and the shape of clamp dog and big I decide according to the sintering oven type, generally can be made into close with common building usefulness standard square shape size.The block raw material of making 8 is sent into sintering 9, and sintering oven can be used tunnel furnace, perhaps annular kiln, perhaps down-draft kiln all can, for fuel saving, optimal kiln type is tunnel furnace and annular kiln.Sintering temperature is at 1250～1450 ℃.The grog piece 10 that sinters enters 11 and pulverizes, more than smashing fineness to 120 order.Chamotte powder 12 after the pulverizing enters and leaches operation 13, and leach liquor is the Na with 150 grams per liters
2CO
3Solution, its solid-to-liquid ratio are to be advisable at 1: 5, and extraction temperature is 80 ℃～95 ℃, and the time is 30 minutes, stir simultaneously, leach Na
2CO
3Usually be to decompose Al(OH) with carbonating
3Back regenerated mother liquor solution 14 after evaporation concentration is supplied with, when its concentration does not reach 150 grams per liters, by 15 solid Na
2CO
3Replenish.Suspension 17 after leaching is finished enters and filters 18, solution desilicification after the filtration is handled by existing normal pressure secondary desilication method, its flow process is that the washing water 23 that the solution 19 after filtering and filter residue 20 enter washing 21 are all entered desiliconization slot 24 one time, and the slag 22 after washing discards (also can produce cement raw material).The slag 25 of secondary desiliconization adds a desiliconization slot 24 and makes the desiliconization crystal, with being steam heated to more than 95 ℃, boils about 5 hours, and the suspension 26 after the desiliconization enters 27, desiliconization filter residues 16 of filtration while hot and sends into leaching vat 13, its objective is and uses Na
2CO
3Calcium aluminosilicate hydrate (the 3CaOAl that solution generates when decomposing desiliconization
2O
3XSiO
2(6-2x) H
2O) recyclable Al wherein
2O
3, the filtrate 28 of a desiliconization enters secondary desiliconization slot 29, and the secondary desiliconization need add lime 30, and its amount is to contain SiO in the solution after the desiliconization
220 to 30 times, boil with being steam heated to, kept about 2 hours.The suspension 31 of secondary desiliconization enters filter 23 2, and the secondary desiliconization slag 25 that gets after the filtration is sent into a desiliconization slot and made a desiliconization crystal seed, and its limpid sodium aluminate solution 33 enters carbonating decomposition process 34, and it is to use the CO that sprays 44 generations of self-priming limestone kiln that carbonating is decomposed
235 enter carbonization decomposites Al(OH)
3(as previously mentioned).44 lime that produce are as raw material 2.The Al(OH that carbonating is decomposed the back gained)
3 Suspension 36 enters filter 23 7, the Al(OH of gained)
339 through washing 40, draws product 41, filters back mother liquor 38 and washing Al(OH)
3Washing water 42 enter evaporation concentration 43(after merging and filter with washing and can in the automatic filtration washing machine, carry out simultaneously).Solution 14 after the evaporation concentration returns leaching 13 and recycles.
The quality product that obtains according to the present embodiment is as follows:
Index name is the product after the Industrial products desiliconization of desiliconization not
Al（OH）
3% 97.4% 99.5%
Al
2O
3% 97.0% 99.2%
Water-soluble salt 0.17% undetermined
Iron (Fe) % 0.02% 0.017%
SiO
2% 0.44% 0.017%
Na
2O% 0.05% 0.40%
Annotate: the desiliconization product is the laboratory product
The desiliconization product is not Industrial products
From above-mentioned quality as can be known, product can reach aluminum oxide national standard one-level, and aluminium hydroxide far surpasses existing chemical grade company standard.
Table one
This lime of the former lime of soda-lime
Mode of production Bayer process
Sintering process sintering process sintering process
Be suitable for bauxite grade
More than 8 about 3～8 3 3～8, all be fit to more than 8
（A/S）
Bauxite consumption about 1.8
About 2 about 2～3 about 3～5
(t/tAl
2O
3) (more than 8)
Total Al
2O
3Output capacity % about 70 about 70 about 40 is more than 80
The chemistry alkaline consumption
About 110 about 100 below 50 about 150
KgNa
2CO
3/tAl
2O
3
Total alkali consumption
About 200 about 200 about 300 about 100
KgNa
2CO
3/tAl
2O
3
Energy consumption
4.3 5 6 4
1,000,000 kilocalories/tAl
2O
3
Claims (1)
1, a kind of lime sinter process of producing aluminium hydroxide, this method comprises: lime (or Wingdale) and aluminium ore are pressed CaO and Al
2O
3Molecular ratio be 1-1, after 1 batch mixes, more than smashing fineness to 150 order, add water and make brick-shaped material piece, in tunnel furnace, annular kiln or down-draft kiln, carry out external putting-in coal or coal gas, at 1250-1450 ℃ of following sintering, with the leaching of 150 grams per liter sodium carbonate solutions, leaching liquid carries out carbonating with the carbonic acid gas that sprays the self-priming lime-kiln gas to the sintered clinker piece after crushed; Separate out Al (OH)
3, Recycling Mother Solution is used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN90110019.6A CN1024177C (en) | 1990-12-19 | 1990-12-19 | Novel method for producing aluminum hydroxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN90110019.6A CN1024177C (en) | 1990-12-19 | 1990-12-19 | Novel method for producing aluminum hydroxide |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1062885A CN1062885A (en) | 1992-07-22 |
| CN1024177C true CN1024177C (en) | 1994-04-13 |
Family
ID=4881726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN90110019.6A Expired - Lifetime CN1024177C (en) | 1990-12-19 | 1990-12-19 | Novel method for producing aluminum hydroxide |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1024177C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1070463C (en) * | 1995-07-10 | 2001-09-05 | 贵州大学 | calcining method of solid material |
| CN1433964B (en) * | 2003-03-12 | 2010-10-06 | 湖南化工研究院 | Process for preparing superfine aluminium hydroxide |
| CN101555031A (en) * | 2009-05-25 | 2009-10-14 | 贵州师范大学 | Intensified lime-sintering method for preparing alumina clinker by adopting medium or high-grade alumyte |
| CN102502737A (en) * | 2011-11-03 | 2012-06-20 | 沈阳铝镁设计研究院有限公司 | Method for dissolving out alumina clinker |
-
1990
- 1990-12-19 CN CN90110019.6A patent/CN1024177C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CN1062885A (en) | 1992-07-22 |
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