CN103663517A - Method for reducing proportion of sodium and silicone in red mud dissolved out by ore dressing Bayer process - Google Patents
Method for reducing proportion of sodium and silicone in red mud dissolved out by ore dressing Bayer process Download PDFInfo
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- CN103663517A CN103663517A CN201310602343.0A CN201310602343A CN103663517A CN 103663517 A CN103663517 A CN 103663517A CN 201310602343 A CN201310602343 A CN 201310602343A CN 103663517 A CN103663517 A CN 103663517A
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- Prior art keywords
- red mud
- sodium
- silicon
- ore
- bayer process
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Links
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000004131 Bayer process Methods 0.000 title claims abstract description 27
- 239000011734 sodium Substances 0.000 title abstract description 17
- 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 title abstract description 14
- 229910052708 sodium Inorganic materials 0.000 title abstract description 14
- 229920001296 polysiloxane Polymers 0.000 title abstract 4
- 239000003513 alkali Substances 0.000 claims abstract description 25
- 229910001570 bauxite Inorganic materials 0.000 claims abstract description 16
- 239000002002 slurry Substances 0.000 claims abstract description 16
- 238000004090 dissolution Methods 0.000 claims abstract description 10
- 238000005115 demineralization Methods 0.000 claims description 4
- 230000002328 demineralizing effect Effects 0.000 claims description 3
- 239000004615 ingredient Substances 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 14
- 235000008733 Citrus aurantifolia Nutrition 0.000 abstract description 12
- 235000011941 Tilia x europaea Nutrition 0.000 abstract description 12
- 239000004571 lime Substances 0.000 abstract description 12
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000000926 separation method Methods 0.000 abstract description 7
- 239000007787 solid Substances 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract description 2
- 239000002893 slag Substances 0.000 abstract description 2
- 239000003518 caustics Substances 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 9
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 5
- 238000002386 leaching Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000010792 warming Methods 0.000 description 5
- 239000000404 calcium aluminium silicate Substances 0.000 description 4
- 235000012215 calcium aluminium silicate Nutrition 0.000 description 4
- WNCYAPRTYDMSFP-UHFFFAOYSA-N calcium aluminosilicate Chemical compound [Al+3].[Al+3].[Ca+2].[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O WNCYAPRTYDMSFP-UHFFFAOYSA-N 0.000 description 4
- 229940078583 calcium aluminosilicate Drugs 0.000 description 4
- 238000009413 insulation Methods 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 230000029087 digestion Effects 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- KMWBBMXGHHLDKL-UHFFFAOYSA-N [AlH3].[Si] Chemical compound [AlH3].[Si] KMWBBMXGHHLDKL-UHFFFAOYSA-N 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 description 1
- 235000011089 carbon dioxide Nutrition 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 229910001948 sodium oxide Inorganic materials 0.000 description 1
Abstract
A method for reducing the proportion of sodium and silicone in red mud dissolved out by an ore dressing Bayer process relates to an improvement on a high-pressure dissolution technology in the process of producing aluminium oxide by the ore dressing Bayer process. The method is characterized in that ore slurry subjected to pre-desilicication and circulating alkali liquor are heated respectively and then mixed, and the ore slurry mixed with circulating alkali liquor is heated, kept warm and stopped for dissolution. Under the condition of not changing raw materials such as bauxite and lime, the molecular proportion of dissolution and the concentration of caustic alkali, the method increases the temperature increase speed of the ore slurry, and shortens the residence time of the ore slurry at the preheating temperature increase stage; the ore slurry is kept warm and stopped for dissolution after reaching the dissolution temperature, and after being dissolved out, the ore slurry is diluted for liquid-solid separation and then sent into a Bayer-process production procedure. The method increases the temperature increase speed of the ore slurry at the preheating temperature increase stage, shortens the residence time of the ore slurry, and can reduce the content of sodium-silicone slag in the red mud, the proportion of sodium and silicone in the red mud and the production cost of aluminium oxide.
Description
Technical field
Reduce a method for Liquor of Ore Dressing Bayer process exsolution red mud sodium-silicon-rate, relate to the improvement that a kind of Liquor of Ore Dressing Bayer process is produced alumina process mesohigh dissolving-out process.
Background technology
China's bauxite has the feature of high alumina, high silicon, and in the process of alumina producing Bayer process, the siliceous mineral in ore easily changes into sodium white residue (Na in process in leaching
2oAl
2o
32SiO
22H
2o) and calcium aluminosilicate hydrate (3CaOAl
2o
3xSiO
2(6-2x) H
2o), during dissolved mineral slurry solid-liquid separation, sodium white residue and calcium-silicon slag enter red mud and arrange outward, cause Na
2o and Al
2o
3loss.The Na that wherein sodium white residue causes
2o loss is the important component of Bayer process alkaline consumption, accounts for the 70-80% of Bayer process alumina producing alkaline consumption.In recent years, domestic alumina industry competition, controls alumina production cost most important, and bauxite grade variation, A/S reduction raises high pressure digestion red mud N/S gradually, and Production Flow Chart alkaline consumption increases, and does not utilize and reduces production costs.
In actual production for reducing Bayer process alkaline consumption, most critical be exactly the sodium-silicon-rate that reduces exsolution red mud.Adopt the method for adding lime, utilize calcium oxide and calcium aluminate in lime at high temperature easily to generate the calcium aluminosilicate hydrate that solubleness is little, reduce the growing amount of sodium white residue, can reduce the sodium-silicon-rate of exsolution red mud.Reduce the sodium carbonate in process in leaching, reduce the content of carbonic acid gas in the calcium carbonate in sodium carbonate source-circulation alkali liquor, lime, improve the stability of process in leaching calcium aluminosilicate hydrate in solution, reduce calcium aluminosilicate hydrate and be transformed into sodium white residue by soda decomposition, can reduce the sodium-silicon-rate of exsolution red mud.Select alumina silica ratio bauxite high, that sample to carry out high pressure digestion, in reduction ore, can be combined with sodium oxide the silicon mine content of generation sodium white residue, can reduce the sodium-silicon-rate of exsolution red mud.
These methods, by reducing the growing amount of sodium white residue in process in leaching, make less alkali enter exsolution red mud, have reduced Bayer process alkaline consumption, have reduced ton alumina production cost.But it is larger that these methods are affected by the factors such as ore kind and grade, lime quality, system fluctuation of concentration, when bauxite grade variation, exist exsolution red mud sodium-silicon-rate to reduce not obvious, red mud amount increases, and system red mud is processed the shortcomings such as load is large.
Summary of the invention
Object of the present invention is exactly the deficiency existing for above-mentioned prior art, provide that a kind of affected by bauxite kind and grade, lime quality, system concentration etc. less, when bauxite grade is poor, can effectively reduce the method for the reduction Liquor of Ore Dressing Bayer process exsolution red mud sodium-silicon-rate of process in leaching sodium white residue growing amount.
The object of the invention is to be achieved through the following technical solutions.
Reduce a method for Liquor of Ore Dressing Bayer process exsolution red mud sodium-silicon-rate, after it is characterized in that ore pulp after pre-desiliconizing and circulation alkali liquor to heat respectively, then mix, mixed ore pulp heats, is incubated and stops stripping.
A kind of method that reduces Liquor of Ore Dressing Bayer process exsolution red mud sodium-silicon-rate of the present invention, it is characterized in that its pre-desilicification process be will admittedly be contained in the bauxite slurry of 900-1000g/l, at 95-100 ℃, carry out the pre-desiliconizing of 8-10 hour.
A kind of method that reduces Liquor of Ore Dressing Bayer process exsolution red mud sodium-silicon-rate of the present invention, it is characterized in that ore pulp and circulation alkali liquor after pre-desiliconizing are heated to respectively 160-170 ℃ and 180-190 ℃, then mix, mixed ore pulp reheats to 260-265 ℃ and is incubated and stops stripping.
A kind of method that reduces Liquor of Ore Dressing Bayer process exsolution red mud sodium-silicon-rate of the present invention, is characterized in that pre-demineralization slurry and alkali lye are to collaborate after sleeve preheating.Improve the heat-up rate of the rear ore pulp in interflow preheating section before insulation stripping, reduce the growing amount of sodium white residue, reduce the sodium-silicon-rate of exsolution red mud.
A kind of method that reduces Liquor of Ore Dressing Bayer process exsolution red mud sodium-silicon-rate of the present invention, is characterized in that stripping ingredients molecular ratio is 1.50-1.60, and the severe alkali concn of stripping is 200-260g/l, and stripping temperature is 260-265 ℃, and dissolution time is 60-85min.
A kind of method that reduces Liquor of Ore Dressing Bayer process exsolution red mud sodium-silicon-rate of the present invention, do not change the raw materials such as bauxite, lime, under the condition of stripping molecular ratio, the severe alkali concn of stripping, stripping temperature and dissolution time, realize and reduce exsolution red mud sodium-silicon-rate, reduce the object of Bayer process alkali loss.Pre-demineralization slurry and alkali lye are to collaborate after sleeve preheating, improve the heat-up rate of the rear ore pulp in interflow preheating section before insulation stripping, reduce the growing amount of sodium white residue, reduce the sodium-silicon-rate of exsolution red mud, before insulation stripping, the heat-up rate of preheating section is faster, and exsolution red mud sodium-silicon-rate is lower.
A kind of method that reduces Liquor of Ore Dressing Bayer process exsolution red mud sodium-silicon-rate of the present invention, gives demineralization slurry and alkali lye in the method for the residence time of pre-heating temperature elevation section after sleeve preheating with reducing, and reduces sodium white residue growing amount, effectively reduces exsolution red mud sodium-silicon-rate.Do not change the indexs such as stripping molecular ratio, the severe alkali concn of stripping, stripping temperature and dissolution time, affected by bauxite grade, lime quality etc. less, also do not exist red mud amount to increase, system red mud is processed the problem that load is large simultaneously.
Embodiment
Reduce a method for Liquor of Ore Dressing Bayer process exsolution red mud sodium-silicon-rate, after ore pulp after pre-desiliconizing and circulation alkali liquor are heated respectively, then mix, mixed ore pulp heats, is incubated and stops stripping; Its pre-desilicification process be will admittedly be contained in the bauxite slurry of 900-1000g/l, at 95-100 ℃, carry out the pre-desiliconizing of 8-10 hour; Ore pulp after pre-desiliconizing and circulation alkali liquor are heated to respectively 160-170 ℃ and 180-190 ℃, then mix, and mixed ore pulp reheats to 260-265 ℃ and is incubated and stops stripping; Its stripping ingredients molecular ratio is 1.50-1.60, and the severe alkali concn of stripping is 200-260g/l, and stripping temperature is 260-265 ℃, and dissolution time is 60-85min.
Embodiment 1
1, bauxite SiO
2content 9.3%, Al
2o
3content 63.7%, the severe alkali concn 230g/l of stripping, stripping molecular ratio 1.08, lime batching calcium is than 1.05.
2, by batching index, bauxite, circulation alkali liquor, lime are mixed into ore pulp, mixed ore pulp is warming up to 265 ℃ from 175 ℃ in 55min, at 265 ℃, be incubated stripping 80min, then carry out liquid-solid separation.
3, exsolution red mud is carried out to chemical composition analysis, its sodium-silicon-rate is 0.441.
Embodiment 2
1, the present embodiment is identical with above-described embodiment 1 process, and different is mixed ore pulp is warming up to 265 ℃ from 175 ℃ in 30min, is incubated stripping 80min at 265 ℃, then carries out liquid-solid separation.
2, exsolution red mud is carried out to chemical composition analysis, its sodium-silicon-rate is 0.364.
Embodiment 3
1, the present embodiment is identical with above-described embodiment 1 process, and different is mixed ore pulp is warming up to 265 ℃ from 175 ℃ in 5min, is incubated stripping 80min at 265 ℃, then carries out liquid-solid separation.
2, exsolution red mud is carried out to chemical composition analysis, its sodium-silicon-rate is 0.351.
Embodiment 4
1, bauxite aluminium-silicon ratio is 5.46, the severe alkali concn 230g/l of stripping, and stripping molecular ratio 1.08, lime batching calcium is than 1.05.
2, by batching index, bauxite, circulation alkali liquor, lime are mixed into ore pulp, mixed ore pulp is warming up to 265 ℃ from 175 ℃ in 55min, at 265 ℃, be incubated stripping 80min, then carry out liquid-solid separation.
3, exsolution red mud is carried out to chemical composition analysis, its sodium-silicon-rate is 0.35.
Embodiment 5
1, the present embodiment is identical with above-described embodiment 4 processes, and different is mixed ore pulp is warming up to 265 ℃ from 175 ℃ in 5min, is incubated stripping 80min at 265 ℃, then carries out liquid-solid separation.
2, exsolution red mud is carried out to chemical composition analysis, its sodium-silicon-rate is 0.33.
Claims (5)
1. reduce a method for Liquor of Ore Dressing Bayer process exsolution red mud sodium-silicon-rate, after it is characterized in that ore pulp after pre-desiliconizing and circulation alkali liquor to heat respectively, then mix, mixed ore pulp heats, is incubated and stops stripping.
2. a kind of method that reduces Liquor of Ore Dressing Bayer process exsolution red mud sodium-silicon-rate according to claim 1, it is characterized in that its pre-desilicification process be will admittedly be contained in the bauxite slurry of 900-1000g/l, at 95-100 ℃, carry out the pre-desiliconizing of 8-10 hour.
3. a kind of method that reduces Liquor of Ore Dressing Bayer process exsolution red mud sodium-silicon-rate according to claim 1, it is characterized in that ore pulp and circulation alkali liquor after pre-desiliconizing are heated to respectively 160-170 ℃ and 180-190 ℃, then mix, mixed ore pulp reheats to 260-265 ℃ and is incubated and stops stripping.
4. a kind of method that reduces Liquor of Ore Dressing Bayer process exsolution red mud sodium-silicon-rate according to claim 1, is characterized in that pre-demineralization slurry and alkali lye are to collaborate after sleeve preheating.
5. a kind of method that reduces Liquor of Ore Dressing Bayer process exsolution red mud sodium-silicon-rate according to claim 1, it is characterized in that stripping ingredients molecular ratio is 1.50-1.60, the severe alkali concn of stripping is 200-260g/l, and stripping temperature is 260-265 ℃, and dissolution time is 60-85min.
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|---|---|---|---|
| CN201310602343.0A CN103663517B (en) | 2013-11-26 | 2013-11-26 | A kind of method reducing Liquor of Ore Dressing Bayer process exsolution red mud sodium-silicon-rate |
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|---|---|---|---|
| CN201310602343.0A CN103663517B (en) | 2013-11-26 | 2013-11-26 | A kind of method reducing Liquor of Ore Dressing Bayer process exsolution red mud sodium-silicon-rate |
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| Publication Number | Publication Date |
|---|---|
| CN103663517A true CN103663517A (en) | 2014-03-26 |
| CN103663517B CN103663517B (en) | 2016-07-13 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1324765A (en) * | 2000-05-19 | 2001-12-05 | 郑州轻金属研究院 | Alumina producing process with hydraulic duralumin-type bauxite concentrate |
| CN1887714A (en) * | 2006-08-01 | 2007-01-03 | 中国铝业股份有限公司 | Lime slaking process for alumina production |
| CN101264909A (en) * | 2008-04-25 | 2008-09-17 | 河南未来铝业（集团）有限公司 | Technique for producing aluminum hydroxide or aluminum oxide by Bayer process |
| CN101343074A (en) * | 2008-08-25 | 2009-01-14 | 中南大学 | Bauxite dissolving out method for reducing caustic alkali combined in prepared red mud |
-
2013
- 2013-11-26 CN CN201310602343.0A patent/CN103663517B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1324765A (en) * | 2000-05-19 | 2001-12-05 | 郑州轻金属研究院 | Alumina producing process with hydraulic duralumin-type bauxite concentrate |
| CN1887714A (en) * | 2006-08-01 | 2007-01-03 | 中国铝业股份有限公司 | Lime slaking process for alumina production |
| CN101264909A (en) * | 2008-04-25 | 2008-09-17 | 河南未来铝业（集团）有限公司 | Technique for producing aluminum hydroxide or aluminum oxide by Bayer process |
| CN101343074A (en) * | 2008-08-25 | 2009-01-14 | 中南大学 | Bauxite dissolving out method for reducing caustic alkali combined in prepared red mud |
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| CN103663517B (en) | 2016-07-13 |
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Effective date of registration: 20170602 Address after: 454171 Henan city of Jiaozuo province Xiuwu County Qixian town Zhongzhou aluminum plant Patentee after: Chalco Zhongzhou Aluminium Industry Co., Ltd. Address before: 100082 Beijing, Xizhimen, North Street, No. 62, No. Patentee before: Aluminum Corporation of China Limited |
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