CN101070174A - Novel sodium aluminate dissolving out process - Google Patents
Novel sodium aluminate dissolving out process Download PDFInfo
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- CN101070174A CN101070174A CN 200710110567 CN200710110567A CN101070174A CN 101070174 A CN101070174 A CN 101070174A CN 200710110567 CN200710110567 CN 200710110567 CN 200710110567 A CN200710110567 A CN 200710110567A CN 101070174 A CN101070174 A CN 101070174A
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- China
- Prior art keywords
- sodium aluminate
- mother liquor
- bauxite
- circulating mother
- out process
- Prior art date
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Links
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 title claims abstract description 58
- 229910001388 sodium aluminate Inorganic materials 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims description 35
- 229910001570 bauxite Inorganic materials 0.000 claims abstract description 29
- 239000012452 mother liquor Substances 0.000 claims abstract description 27
- 239000011734 sodium Substances 0.000 claims abstract description 19
- 239000000203 mixture Substances 0.000 claims abstract description 14
- 239000007787 solid Substances 0.000 claims abstract description 13
- 239000013078 crystal Substances 0.000 claims abstract description 11
- 229910001648 diaspore Inorganic materials 0.000 claims abstract description 11
- 229910001679 gibbsite Inorganic materials 0.000 claims abstract description 10
- 229910001593 boehmite Inorganic materials 0.000 claims abstract description 8
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 claims abstract description 8
- 239000006210 lotion Substances 0.000 claims abstract description 5
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 239000008247 solid mixture Substances 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 13
- 238000005516 engineering process Methods 0.000 claims description 11
- 238000005406 washing Methods 0.000 claims description 11
- 238000001354 calcination Methods 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 238000000354 decomposition reaction Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- 230000007062 hydrolysis Effects 0.000 claims description 5
- 238000006460 hydrolysis reaction Methods 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 4
- 239000012141 concentrate Substances 0.000 claims description 4
- 230000018044 dehydration Effects 0.000 claims description 4
- 238000006297 dehydration reaction Methods 0.000 claims description 4
- 238000001704 evaporation Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 239000004411 aluminium Substances 0.000 claims description 2
- 229910001710 laterite Inorganic materials 0.000 claims description 2
- 239000011504 laterite Substances 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 239000011435 rock Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 abstract description 3
- 229910021502 aluminium hydroxide Inorganic materials 0.000 abstract description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 abstract description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 2
- 239000011707 mineral Substances 0.000 abstract description 2
- 229910052708 sodium Inorganic materials 0.000 abstract description 2
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 abstract 1
- 238000005265 energy consumption Methods 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 8
- 239000003513 alkali Substances 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000005245 sintering Methods 0.000 description 4
- HUAUNKAZQWMVFY-UHFFFAOYSA-M sodium;oxocalcium;hydroxide Chemical compound [OH-].[Na+].[Ca]=O HUAUNKAZQWMVFY-UHFFFAOYSA-M 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 3
- 240000006909 Tilia x europaea Species 0.000 description 3
- 235000011941 Tilia x europaea Nutrition 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 238000002386 leaching Methods 0.000 description 3
- 239000004571 lime 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
- 229910010413 TiO 2 Inorganic materials 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000011552 falling film Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000001694 spray drying Methods 0.000 description 2
- 239000006200 vaporizer Substances 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention offers a new kind of craft to separate out sodium aluminate, it mainly includes the following steps: mix bauxite(includes diaspore, boehmite and other aluminiferous mineral gibbsite) and circulating mother liquor at room temperature->pre-dewatering->accede to rotary kiln of external heating->get solid sodium aluminate->mix with lotion of red mud and Al(OH)3 and hydrolyze into desilication->filter and get Na2O and Al2O3->decompose sodium aluminate solution in the seed crystal and filter it to get Al(OH)3 and circulating mother liquor->get production after abstersion and calcination->Rionpone and alumina. Circulating mother liquor after concentration continues to mix with bauxite to operate circulatingly. The advantages of new craft of sodium aluminate in this invention are that the flow is simple, investment of equipment for once is small, energy consumption is distinctly reduced, and production cost is low.
Description
Technical field: the present invention relates to the field of production of aluminum oxide, particularly is raw material with bauxite, generates the production method of sodium aluminate solution.
Background technology: the production process of existing commercial alumina mainly contains two portions and forms: 1. mixed by bauxite and alkali, reaction under certain conditions generates sodium aluminate; 2. sodium aluminate is decomposed under certain condition and generate l (OH)
3, Al (OH)
3The calcining back generates Al
2O
3
Existing commercial alumina production method mainly contains " Baeyer high pressure stripping method " and " soda-lime sintering process ":
The generation of the sodium aluminate in the Baeyer high pressure stripping method technology, be to adopt bauxite and NaOH solution to mix, enter then in the ore pulp storage tank, under 100 ℃～105 ℃, the insulation 8h～10h carry out pre-desiliconization, be sent in the high pressure digester of 230 ℃～280 ℃ of temperature, pressure 3.7MPa～6.5MPa with the ore pulp after the special pre-desiliconization of high-pressure pump handle again, make Al in the bauxite
2O
3Change into sodium aluminate, sodium aluminate can obtain aluminum oxide again after decomposing, wash, calcining.
Baeyer high pressure stripping method is owing to be to operate under high pressure, high temperature, and therefore, equipment materials, manufacture craft are strict, and support equipment is many, invest huge, and the potential safety hazard that exists the chemical medium high pressure to explode.
The generation of the sodium aluminate in the soda-lime sintering process technology is bauxite, white lime, Na
2CO
3Material such as solution and coal mix mutually wear into ore pulp after, with high-pressure spray gun ore pulp is delivered in the rotary kiln of 1250 ℃～1350 ℃ of temperature and is calcined.Al in the bauxite
2O
3At high temperature with Na
2CO
3Reaction generates sodium aluminate, and sodium aluminate can generate Al after decomposing through carbonization
2O
3
Soda-lime sintering process when proportioning raw materials owing to allocated subsidiary material such as a large amount of white limes, coal into, so mass flow is big comparatively speaking, the Al of grog per ton institute energy output
2O
3Quality is few.Because ore pulp is to react under 1250 ℃～1350 ℃ to generate sodium aluminate, therefore, exists many unfavorable factors such as fabrication cost height, energy-output ratio is big, production cost is high, quality product is low.
Content of the present invention:
The objective of the invention is to overcome the defective of above-mentioned prior art, a kind of novel sodium aluminate dissolving out process is provided, this technology is compared with bayer's process high pressure dissolving-out process, novel sour sodium dissolving-out process does not have ore pulp under 100 ℃～105 ℃, be incubated the pre-desiliconization program of 8h～10h, also do not have the high-tension apparatus of pressure 3.7MPa～6.5MPa, process in leaching is communicating with atmosphere, length is very short, heats outward to carry out in the rotary kiln.Reaction process is operated easily, particularly the bauxite of various crystal formations under design temperature, Al in the bauxite
2O
3Can in 1 minute, (refer under the theoretical extraction yield of bauxite) all change into the characteristics of sodium aluminate with alkali.This technology is compared aspect the proportioning raw materials with soda-lime sintering process technology, and novel sodium aluminate dissolving out process does not have the adding of subsidiary material such as a large amount of white lime, coal, aspect the stripping temperature, does not have 1250 ℃～1350 ℃ high temperature process in leaching.The process in leaching of novel sodium aluminate dissolving out process, for the diaspore that indissoluble goes out, the stripping temperature be just can be under 460 ℃ ± 30 ℃, 1 minute condition of weighing apparatus temperature bauxite in Al
2O
3Generate sodium aluminate with alkali reaction.
In sum: novel sodium aluminate dissolving out process have safety, environmental protection, energy-conservation, fabrication cost is low, quality product is high, production cost is low, production process is easy, simple operation and other advantages.
The objective of the invention is to realize that by following technical proposals novel sodium aluminate dissolving out process provided by the present invention comprises the steps:
1), bauxite (diaspore, boehmite, gibbsite) and circulating mother liquor are prepared burden;
2), in the whipping appts that plain carbon stool is made, bauxite and circulating mother liquor, under uncovered, room temperature, stirred 10～20 minutes;
3), mixed ore pulp is dewatered with being pumped in the pre-dehydration device, make ore pulp become water ratio less than 10% solid mixture;
4), solid mixture is sent to outer heating rotary kiln internal heating, solid mixture top temperature place operation after 1 minute in the heating rotary kiln outside, contained Al in the bauxite
2O
3, change into solid sodium aluminate; Al
2O
3(1 or 3) H
2O+2NaOH+H
2O
2NaAlO
2+ 2H
2O ↑
5), the solid sodium aluminate mixture that comes out in the rotary kiln directly enters by red mud wash liquor and Al (OH)
3In the whipping appts that washing lotion is formed, desiliconization is hydrolyzed under normal pressure:
2NaAlO
2+H
2O+aq=2NaOH+Al
2O
3+aq
6), the sodium aluminate mixing solutions after hydrolysis, the desiliconization is filtered, make sodium aluminate solution and red mud, send red mud dump behind the laterite washing;
7), sodium aluminate solution is sent in the decomposition of crystal seed groove, add the crystal seed sodium aluminate and decompose, generate Al (OH)
3And circulating mother liquor;
8), obtain solid Al (OH) by filtration
3, after through washing, calcination procedure, can get product level Al (OH)
3And Al
2O
3
9), liquid---the circulating mother liquor that obtains after filtering, deliver in the multi-effect evaporating device and concentrate, circulating mother liquor concentration is increased, circulating mother liquor and bauxite after concentrating are then proceeded mix;
10), the operation capable of circulation of above-mentioned technology, can produce product～Al (OH) continuously
3And Al
2O
3
The above-mentioned the 1st) batching in the step requires to be Na
2O: Al
2O
3Mol ratio MR=1.36～1.52;
The above-mentioned the 4th) in the step when used bauxite is diaspore, heat outward in the scope that top temperature place temperature in the rotary kiln is controlled at 460 ℃ ± 30 ℃; When used bauxite is a water aluminium soft rock, gibbsite, heats the interior top temperature place of rotary kiln temperature outward and be controlled in 330 ℃～400 ℃ scopes;
The above-mentioned the 6th) prepared sodium aluminate solution and its Na of red mud in the step
2O: Al
2O
3Mol ratio MR=1.52～1.56, siliceous modulus A/S＞250;
Require fineness as follows when preparing burden at above-mentioned (in the batching program) bauxite: diaspore is in 120～160 order scopes; Boehmite and gibbsite are in 60～100 order scopes;
Circulating mother liquor in above-mentioned (in the batching program) is meant: by H
2O, NaOH, Na
2CO
3, Na
2SO
4, Al
2O
3And a small amount of SiO
2, Fe
2O
3The liquid mixture of forming.
Below with regard to technology contents of the present invention and describe conjunction with figs. in detail and given embodiment describes as follows.
Description of drawings
Fig. 1 is a novel sodium aluminate dissolving out process schema of the present invention.
Embodiment:
Referring to accompanying drawing, novel sodium aluminate dissolving out process provided by the present invention mainly comprises the steps:
Bauxite (comprising diaspore, boehmite, gibbsite and other aluminum-containing mineral) and circulating mother liquor are stirred at normal temperatures → dewater in advance → join in the outer heating rotary kiln → obtain solid sodium aluminate → with red mud wash liquor and Al (OH)
3Obtain Na after mixed hydrolysis desiliconization → filtration
2O and Al
2O
3→ sodium aluminate solution filters after decomposition of crystal seed and makes Al (OH)
3And can obtain product → aluminium hydroxide and aluminum oxide after circulating mother liquor → washing calcining.
Embodiment 1
Use novel sodium aluminate dissolving out process, moulding the continent diaspore with Shanxi is that raw material is produced, and ore is composed as follows:
| Al 2O 3 | SiO 2 | Fe 2O 3 | TiO 2 | CaO | A/S |
| 68.62 | 9.68 | 2.33 | 1.86 | 1.73 | 7.09 |
Implementation step is as follows:
1, diaspore was crushed to 150 mesh sieves (screen over-size is less than 8%) and circulating mother liquor and (pressed Na
2O: Al
2O
3Mol ratio 1.50～1.52 prepare burden (remarks: when operating for the first time, during no circulating mother liquor, the liquid NaOH in the available chlorine industry or use solid NaOH+H
2The O dissolving is produced);
2, in the whipping appts that plain carbon stool is made, under uncovered, room temperature, stirred 10～20 minutes;
3, mixed ore pulp is dewatered in advance the solid mixture of ore pulp is become moisture≤10% with being pumped in hig h-speed centrifugal spray drying device or other drying installation and the ore pulp evaporation equipment;
4, the solid mixture through pre-dehydration is entered into length 6m～9m, in the outer heating rotary kiln that diameter increases with the increase of output, top temperature place temperature is controlled in 460 ℃ ± 30 ℃ the scope in the outer heating rotary kiln, solid mixture is 10～16 minutes working times in the heating rotary kiln outside, can finish Al in the bauxite
2O
3Reaction process with alkali reaction generation sodium aluminate;
5, the sodium aluminate solid mixture that comes out from rotary kiln running can directly enter by red mud wash liquor and Al (OH)
3Washing lotion is formed, plain carbon stool is made, in whipping appts that atmosphere communicates.Make solution temperature be controlled at 85 ℃～95 ℃, whipping appts rotating speed and be controlled at 90r/min～110r/min, Al
2O
3Content reaches 128g/L～130g/L, Na
2O content reaches the desiliconization that is hydrolyzed in the scope of 120g/L～123g/L, stops to stir behind whipping appts operation 3h～4h;
6, the sodium aluminate solution liquid mixture after the hydrolysis desiliconization is filtered, can obtain Na
2O: Al
2O
3Mol ratio MR=1.52～1.56, the sodium aluminate solution of siliceous modulus A/S＞250;
7, sodium aluminate solution is entering the decomposition of crystal seed groove through behind the leaf filter, stirs under the condition of adding crystal seed and can make solid Al (OH)
3And circulating mother liquor;
8, solid Al (OH)
3Behind washing, calcining supervisor, can obtain product level Al (OH)
3And Al
2O
3
9, circulating mother liquor is concentrated through the multiple-effect falling film vaporizer, and the circulating mother liquor after process concentrates returns the continuation of the 1st program and ore carries out mix, stripping next batch product.
Embodiment 2
Using novel sodium aluminate dissolving out process, is that raw material is produced with the Henan boehmite, and composition of ores is as follows:
| Al 2O 3 | SiO 2 | TiO 2 | Fe 2O 3 | CaO | A/S |
| 65.86 | 11.63 | 3.26 | 2.11 | 1.68 | 5.66 |
Implementation step is as follows:
1, the circulating mother liquor of boehmite being pulverized after being 100 mesh sieves (its screen over-size must not surpass 10%) back and (in the above-mentioned example in the 7th program) and concentrating is pressed Na
2O: Al
2O
3Prepare burden in mol ratio MR=1.48～1.51;
2, in the whipping appts that plain carbon stool is made, under uncovered, room temperature, stirred 10～20 minutes;
3, mixed ore pulp is dewatered in advance the solid mixture of ore pulp is become moisture≤10% with being pumped in hig h-speed centrifugal spray drying device or other drying installation and the ore pulp evaporation equipment;
4, the solid mixture through pre-dehydration is entered into length 6m～9m, in the outer heating rotary kiln that diameter increases with the increase of output, top temperature place temperature is controlled in 380 ℃ ± 30 ℃ the scope in the outer heating rotary kiln, solid mixture is 10～16 minutes working times in the heating rotary kiln outside, can finish Al in the bauxite
2O
3Reaction process with alkali reaction generation sodium aluminate;
5, the sodium aluminate solid mixture that comes out from rotary kiln running can directly enter by red mud wash liquor and Al (OH)
3Washing lotion is formed, plain carbon stool is made, in whipping appts that atmosphere communicates.Make solution temperature be controlled at 85 ℃～95 ℃, whipping appts rotating speed and be controlled at 90r/min～110r/min, Al
2O
3Content reaches 128g/L～130g/L, Na
3O content reaches the desiliconization that is hydrolyzed in the scope of 120g/L～123g/L, stops to stir behind whipping appts operation 3h～4h;
6, the sodium aluminate solution liquid mixture after the hydrolysis desiliconization is filtered, can obtain Na
2O: Al
2O
3Mol ratio MR=1.52～1.56, the sodium aluminate solution of siliceous modulus A/S＞250;
7, sodium aluminate solution is entering the decomposition of crystal seed groove through behind the leaf filter, stirs under the condition of adding crystal seed and can make solid Al (OH)
3And circulating mother liquor;
8, solid Al (OH)
3Behind washing, calcining supervisor, can obtain product level Al (OH)
3And Al
2O
3
9, circulating mother liquor is concentrated through the multiple-effect falling film vaporizer, and the circulating mother liquor after process concentrates returns the continuation of the 1st program and ore carries out mix, stripping next batch product.
The above then is specific embodiments of the invention and the technique means used, can derive according to the exposure of this paper or instruction and to derive many changes and correction, if the equivalence of having done according to conception of the present invention changes, when the effect that it produced does not exceed specification sheets and the graphic connotation of containing yet, all should be considered as within technology category of the present invention.
Claims (6)
1, a kind of novel sodium aluminate dissolving out process is characterized in that its technology comprises the steps:
1), bauxite (diaspore, boehmite, gibbsite) and circulating mother liquor are prepared burden;
2), in the whipping appts that plain carbon stool is made, bauxite and circulating mother liquor, under uncovered, room temperature, stirred 10～20 minutes;
3), mixed ore pulp is dewatered with being pumped in the pre-dehydration device, make ore pulp become water ratio less than 10% solid mixture;
4), solid mixture is sent to outer heating rotary kiln internal heating, solid mixture top temperature place operation after 1 minute in the heating rotary kiln outside, contained Al in the bauxite
2O
3Change into solid sodium aluminate;
Al
2O
3(1 or 3) H
2O+2NaOH+H
2O
2NaAlO
2+ 2H
2O ↑
5), the solid sodium aluminate mixture that comes out in the rotary kiln directly enters by red mud wash liquor and Al (OH)
3In the whipping appts that washing lotion is formed, desiliconization is hydrolyzed under normal pressure:
2NaAlO
2+H
2O+aq＝2NaOH+Al
2O
3+aq
6), the sodium aluminate mixing solutions after hydrolysis, the desiliconization is filtered, make sodium aluminate solution and red mud, send red mud dump behind the laterite washing;
7), sodium aluminate solution is sent in the decomposition of crystal seed groove, add the crystal seed sodium aluminate and decompose, generate Al (OH)
3And circulating mother liquor;
8), obtain solid Al (OH) by filtration
3, after through washing, calcination procedure, can get product level Al (OH)
3And Al
2O
3
9), liquid---the circulating mother liquor that obtains after filtering, deliver in the multi-effect evaporating device and concentrate, circulating mother liquor concentration is increased, circulating mother liquor and bauxite after concentrating are then proceeded mix;
10), the operation capable of circulation of above-mentioned technology, can produce product～Al (OH) continuously
3And Al
2O
3
2, novel sodium aluminate dissolving out process according to claim 1 is characterized in that the above-mentioned the 1st) batching in the step requires to be Na
2O: Al
2O
3Mol ratio MR=1.36～1.52.
3, novel sodium aluminate dissolving out process according to claim 1 is characterized in that the above-mentioned the 4th) in the step, when used bauxite is diaspore, heat outward in the scope that top temperature place temperature in the rotary kiln is controlled at 460 ℃ ± 30 ℃; When used bauxite is a water aluminium soft rock, gibbsite, heats the interior top temperature place of rotary kiln temperature outward and be controlled in 330 ℃～400 ℃ scopes.
4, novel sodium aluminate dissolving out process according to claim 1 is characterized in that the above-mentioned the 6th) in the step, its Na of prepared sodium aluminate solution and red mud
2O: Al
2O
3Mol ratio MR=1.52～1.56, siliceous modulus A/S＞250.
5, novel sodium aluminate dissolving out process according to claim 1 is characterized in that above-mentioned (in the batching program) bauxite requires fineness as follows when batching: diaspore is in 120～160 order scopes; Boehmite and gibbsite are in 60～100 order scopes.
6, novel sodium aluminate dissolving out process according to claim 1 is characterized in that the circulating mother liquor of above-mentioned (in the batching program) is meant: by H
2O, NaOH, Na
2CO
3, Na
2SO
4, Al
2O
3And a small amount of SiO
2, Fe
2O
3The liquid mixture of forming.
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|---|---|---|---|
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|---|---|---|---|
| CNB2007101105674A CN100463856C (en) | 2007-06-06 | 2007-06-06 | Novel sodium aluminate dissolving out process |
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|---|---|
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104817100A (en) * | 2015-04-15 | 2015-08-05 | 中南大学 | Method for preparing sand-shaped aluminum oxide |
| CN108745332A (en) * | 2018-07-03 | 2018-11-06 | 贵州大学 | A kind of method of ardealite and high-sulfur bauxite dechlorination catalyst |
| CN113929123A (en) * | 2021-10-13 | 2022-01-14 | 靖西天桂铝业有限公司 | Production process for high-low temperature dissolution combination of multiple bauxite sources |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1214982C (en) * | 2002-11-12 | 2005-08-17 | 中国铝业股份有限公司 | Dissolving-out method for beauxite type bauxite |
| CN1792801A (en) * | 2006-01-10 | 2006-06-28 | 中国铝业股份有限公司 | Process for producing aluminium hydroxide |
-
2007
- 2007-06-06 CN CNB2007101105674A patent/CN100463856C/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104817100A (en) * | 2015-04-15 | 2015-08-05 | 中南大学 | Method for preparing sand-shaped aluminum oxide |
| CN108745332A (en) * | 2018-07-03 | 2018-11-06 | 贵州大学 | A kind of method of ardealite and high-sulfur bauxite dechlorination catalyst |
| CN113929123A (en) * | 2021-10-13 | 2022-01-14 | 靖西天桂铝业有限公司 | Production process for high-low temperature dissolution combination of multiple bauxite sources |
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