CN103663517B - A kind of method reducing Liquor of Ore Dressing Bayer process exsolution red mud sodium-silicon-rate - Google Patents
A kind of method reducing Liquor of Ore Dressing Bayer process exsolution red mud sodium-silicon-rate Download PDFInfo
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- CN103663517B CN103663517B CN201310602343.0A CN201310602343A CN103663517B CN 103663517 B CN103663517 B CN 103663517B CN 201310602343 A CN201310602343 A CN 201310602343A CN 103663517 B CN103663517 B CN 103663517B
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- red mud
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- sodium
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000004131 Bayer process Methods 0.000 title claims abstract description 26
- 238000004090 dissolution Methods 0.000 claims abstract description 37
- 239000003513 alkali Substances 0.000 claims abstract description 24
- 229910001570 bauxite Inorganic materials 0.000 claims abstract description 16
- 238000002386 leaching Methods 0.000 claims abstract description 11
- 238000009413 insulation Methods 0.000 claims abstract description 7
- 239000002002 slurry Substances 0.000 claims description 8
- 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
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 15
- 239000000377 silicon dioxide Substances 0.000 abstract description 14
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 13
- 239000002893 slag Substances 0.000 abstract description 13
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000000926 separation method Methods 0.000 abstract description 7
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 abstract description 2
- 230000014759 maintenance of location Effects 0.000 abstract 1
- 239000004570 mortar (masonry) Substances 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 7
- 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
- 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
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 3
- 235000011941 Tilia x europaea Nutrition 0.000 description 3
- 229910052593 corundum Inorganic materials 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000004571 lime Substances 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 229910001845 yogo sapphire Inorganic materials 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
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-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
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000029087 digestion Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- 230000009885 systemic effect Effects 0.000 description 2
- 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
- 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
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910001948 sodium oxide Inorganic materials 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
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- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
A kind of method reducing Liquor of Ore Dressing Bayer process exsolution red mud sodium-silicon-rate, relates to a kind of Liquor of Ore Dressing Bayer process and produces the improvement of alumina process mesohigh dissolving-out process.After it is characterized in that being respectively heated ore pulp after pre-desiliconizing and circulation alkali liquor, then mixing, mixed ore pulp is heated, is incubated stop dissolution.The present invention is not changing the raw material such as bauxite, Calx, when with dissolution molecular proportion, severe alkali concn, improve the programming rate of ore pulp, shorten the ore pulp time of staying in pre-heating temperature elevation section, carry out insulation after reaching leaching temperature and stop dissolution, ore pulp after dissolution is diluted solid-liquor separation, sends into follow-up Bayer process production process.The inventive method improves the ore pulp programming rate in pre-heating temperature elevation section, shortens mortar retention time, can reduce Sodium-silica slag content in red mud, reduces red mud sodium-silicon-rate, reduces alumina production cost.
Description
Technical field
A kind of method reducing Liquor of Ore Dressing Bayer process exsolution red mud sodium-silicon-rate, relates to a kind of Liquor of Ore Dressing Bayer process and produces the improvement of 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-silica slag (Na in process in leaching2O·Al2O3·2SiO2·2H2And calcium aluminosilicate hydrate (3CaO Al O)2O3·xSiO2·(6-2x)H2O), during dissolved mineral slurry solid-liquid separation, Sodium-silica slag and calcium-silicon slag enter row outside red mud, cause Na2O and Al2O3Loss.The Na that wherein Sodium-silica slag causes2O 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, control alumina production cost most important, and bauxite grade is deteriorated, A/S reduction makes high pressure digestion red mud N/S gradually rise, and production procedure alkaline consumption increases, and does not utilize reduction production cost.
For reducing Bayer process alkaline consumption in actual production, the sodium-silicon-rate reducing exsolution red mud exactly of most critical.Adopt the method adding Calx, utilize the calcium oxide in Calx and calcium aluminate at high temperature easily to generate the calcium aluminosilicate hydrate that dissolubility is little, reduce the growing amount of Sodium-silica slag, it is possible to decrease the sodium-silicon-rate of exsolution red mud.Reduce the sodium carbonate in process in leaching, reduce the content of carbon dioxide in the calcium carbonate in sodium carbonate source-circulation alkali liquor, Calx, improve process in leaching calcium aluminosilicate hydrate stability in the solution, reduce calcium aluminosilicate hydrate and be transformed into Sodium-silica slag by soda decomposition, it is possible to reduce the sodium-silicon-rate of exsolution red mud.Select the bauxite that alumina silica ratio is high, sampled to carry out high pressure digestion, reduce and Ore can be combined with sodium oxide the silicon mineral content generating Sodium-silica slag, it is possible to reduce the sodium-silicon-rate of exsolution red mud.
These methods, by reducing the growing amount of Sodium-silica slag in process in leaching, make less alkali enter exsolution red mud, reduce Bayer process alkaline consumption, reduce a ton alumina production cost.But, these methods are affected relatively big by factors such as Ore kind and grade, lime quality, systemic concentration fluctuations, when bauxite grade is deteriorated, there is exsolution red mud sodium-silicon-rate and reduce inconspicuous, and red mud amount increases, and system red mud processes the shortcomings such as load is big.
Summary of the invention
The purpose of the present invention is aiming at the deficiency that above-mentioned prior art exists, one is provided to be affected less by bauxite kind and grade, lime quality, systemic concentration etc., when bauxite grade is poor, the method that can effectively reduce the reduction Liquor of Ore Dressing Bayer process exsolution red mud sodium-silicon-rate of process in leaching Sodium-silica slag growing amount.
It is an object of the invention to be achieved through the following technical solutions.
A kind of method reducing Liquor of Ore Dressing Bayer process exsolution red mud sodium-silicon-rate, it is characterised in that after ore pulp after pre-desiliconizing and circulation alkali liquor being respectively heated, then mix, mixed ore pulp is heated, is incubated stop dissolution.
A kind of method reducing Liquor of Ore Dressing Bayer process exsolution red mud sodium-silicon-rate of the present invention, it is characterised in that the bauxite slurry by being admittedly contained in 900-1000g/l being of its pre-desilicification process, carries out the pre-desiliconizing of 8-10 hour at 95-100 DEG C.
A kind of method reducing Liquor of Ore Dressing Bayer process exsolution red mud sodium-silicon-rate of the present invention, it is characterized in that the ore pulp after pre-desiliconizing and circulation alkali liquor are separately heated to 160-170 DEG C and 180-190 DEG C, then mixing, mixed ore pulp is again heated to 260-265 DEG C and carries out insulation stop dissolution.
A kind of method reducing Liquor of Ore Dressing Bayer process exsolution red mud sodium-silicon-rate of the present invention, it is characterised in that pre-demineralization slurry and alkali liquor are to collaborate after sleeve preheating.Improve ore pulp programming rate of preheating section before insulation dissolution after collaborating, reduce the growing amount of Sodium-silica slag, reduce the sodium-silicon-rate of exsolution red mud.
A kind of method reducing Liquor of Ore Dressing Bayer process exsolution red mud sodium-silicon-rate of the present invention, it is characterised in that dissolution ingredients molecular ratio is 1.50-1.60, the severe alkali concn of dissolution is 200-260g/l, and leaching temperature is 260-265 DEG C, and dissolution time is 60-85min.
A kind of method reducing Liquor of Ore Dressing Bayer process exsolution red mud sodium-silicon-rate of the present invention, do not change the raw material such as bauxite, Calx, when with dissolution molecular proportion, the severe alkali concn of dissolution, leaching temperature and dissolution time, it is achieved reduce exsolution red mud sodium-silicon-rate, reduce the purpose of Bayer process alkali loss.Pre-demineralization slurry and alkali liquor are to collaborate after sleeve preheating, improve ore pulp programming rate of preheating section before insulation dissolution after collaborating, reduce the growing amount of Sodium-silica slag, reduce the sodium-silicon-rate of exsolution red mud, before insulation dissolution, the programming rate of preheating section is more fast, and exsolution red mud sodium-silicon-rate is more low.
A kind of method reducing Liquor of Ore Dressing Bayer process exsolution red mud sodium-silicon-rate of the present invention, gives demineralization slurry and alkali liquor in the method for the time of staying of pre-heating temperature elevation section after sleeve preheating with reducing, reduces Sodium-silica slag growing amount, effectively reduce exsolution red mud sodium-silicon-rate.Not changing the indexs such as dissolution molecular proportion, the severe alkali concn of dissolution, leaching temperature and dissolution time simultaneously, affected by bauxite grade, lime quality etc. less, being also absent from red mud amount increases, and system red mud processes the problem that load is big.
Detailed description of the invention
A kind of method reducing Liquor of Ore Dressing Bayer process exsolution red mud sodium-silicon-rate, after ore pulp after pre-desiliconizing and circulation alkali liquor being respectively heated, then mixes, and mixed ore pulp is heated, is incubated stop dissolution；The bauxite slurry by being admittedly contained in 900-1000g/l being of its pre-desilicification process, carries out the pre-desiliconizing of 8-10 hour at 95-100 DEG C；Ore pulp and circulation alkali liquor after pre-desiliconizing are separately heated to 160-170 DEG C and 180-190 DEG C, then mix, and mixed ore pulp is again heated to 260-265 DEG C and carries out insulation stop dissolution；Its dissolution ingredients molecular ratio is 1.50-1.60, and the severe alkali concn of dissolution is 200-260g/l, and leaching temperature is 260-265 DEG C, and dissolution time is 60-85min.
Embodiment 1
1, bauxite SiO2Content 9.3%, Al2O3Content 63.7%, the severe alkali concn 230g/l of dissolution, dissolution molecular proportion 1.08, Calx dispensing calcium ratio 1.05.
2, by dispensing index, bauxite, circulation alkali liquor, Calx are mixed into ore pulp, mixed ore pulp is warming up to 265 DEG C from 175 DEG C in 55min, at 265 DEG C, be incubated dissolution 80min, then carry out solid-liquor separation.
3, exsolution red mud being carried out chemical composition analysis, its sodium-silicon-rate is 0.441.
Embodiment 2
1, the present embodiment is identical with above-described embodiment 1 process, the difference is that mixed ore pulp is warming up to 265 DEG C from 175 DEG C in 30min, is incubated dissolution 80min, then carries out solid-liquor separation at 265 DEG C.
2, exsolution red mud being carried out chemical composition analysis, its sodium-silicon-rate is 0.364.
Embodiment 3
1, the present embodiment is identical with above-described embodiment 1 process, the difference is that mixed ore pulp is warming up to 265 DEG C from 175 DEG C in 5min, is incubated dissolution 80min, then carries out solid-liquor separation at 265 DEG C.
2, exsolution red mud being carried out 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 dissolution, dissolution molecular proportion 1.08, Calx dispensing calcium ratio 1.05.
2, by dispensing index, bauxite, circulation alkali liquor, Calx are mixed into ore pulp, mixed ore pulp is warming up to 265 DEG C from 175 DEG C in 55min, at 265 DEG C, be incubated dissolution 80min, then carry out solid-liquor separation.
3, exsolution red mud being carried out chemical composition analysis, its sodium-silicon-rate is 0.35.
Embodiment 5
1, the present embodiment is identical with above-described embodiment 4 process, the difference is that mixed ore pulp is warming up to 265 DEG C from 175 DEG C in 5min, is incubated dissolution 80min, then carries out solid-liquor separation at 265 DEG C.
2, exsolution red mud being carried out chemical composition analysis, its sodium-silicon-rate is 0.33.
Claims (4)
1. the method reducing Liquor of Ore Dressing Bayer process exsolution red mud sodium-silicon-rate, it is characterised in that after ore pulp after pre-desiliconizing and circulation alkali liquor being respectively heated, then mix, mixed ore pulp is heated, is incubated stop dissolution；Dissolution ingredients molecular ratio is 1.50-1.60, and the severe alkali concn of dissolution is 200-260g/l, and leaching temperature is 260-265 DEG C, and dissolution time is 60-85min.
2. a kind of method reducing Liquor of Ore Dressing Bayer process exsolution red mud sodium-silicon-rate according to claim 1, it is characterised in that its pre-desilicification process is the bauxite slurry by being admittedly contained in 900-1000g/l, carries out the pre-desiliconizing of 8-10 hour at 95-100 DEG C.
3. a kind of method reducing Liquor of Ore Dressing Bayer process exsolution red mud sodium-silicon-rate according to claim 1, it is characterized in that the ore pulp after pre-desiliconizing and circulation alkali liquor are separately heated to 160-170 DEG C and 180-190 DEG C, then mixing, mixed ore pulp is again heated to 260-265 DEG C and carries out insulation stop dissolution.
4. a kind of method reducing Liquor of Ore Dressing Bayer process exsolution red mud sodium-silicon-rate according to claim 1, it is characterised in that pre-demineralization slurry and alkali liquor are to collaborate after sleeve preheating.
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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 |
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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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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 |