CN101597075B - Method for direct desulfurization in alumina production - Google Patents
Method for direct desulfurization in alumina production Download PDFInfo
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- CN101597075B CN101597075B CN2008100687649A CN200810068764A CN101597075B CN 101597075 B CN101597075 B CN 101597075B CN 2008100687649 A CN2008100687649 A CN 2008100687649A CN 200810068764 A CN200810068764 A CN 200810068764A CN 101597075 B CN101597075 B CN 101597075B
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- CN
- China
- Prior art keywords
- desulfurization
- alumina
- composite additive
- add
- alumina production
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000000034 method Methods 0.000 title claims abstract description 57
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 41
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 38
- 230000023556 desulfurization Effects 0.000 title claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 239000000654 additive Substances 0.000 claims abstract description 26
- 230000000996 additive effect Effects 0.000 claims abstract description 26
- 239000011593 sulfur Substances 0.000 claims abstract description 19
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 19
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 7
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 6
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims abstract description 4
- 238000001704 evaporation Methods 0.000 claims abstract description 4
- 230000008020 evaporation Effects 0.000 claims abstract description 4
- 239000002131 composite material Substances 0.000 claims description 25
- 229910001570 bauxite Inorganic materials 0.000 claims description 13
- 239000005864 Sulphur Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 8
- 238000001556 precipitation Methods 0.000 claims description 8
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 7
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 7
- 239000011021 lapis lazuli Substances 0.000 claims description 7
- 239000004571 lime Substances 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 5
- 229910021502 aluminium hydroxide Inorganic materials 0.000 claims description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 3
- 238000005304 joining Methods 0.000 claims description 2
- 238000002386 leaching Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 150000001875 compounds Chemical class 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000011701 zinc Substances 0.000 description 5
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 159000000009 barium salts Chemical class 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- 238000004131 Bayer process Methods 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229960001866 silicon dioxide Drugs 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229910001388 sodium aluminate Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
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- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention discloses a method for direct desulfurization in alumina production, comprising the following steps: in the alumina production, directly adopting high-sulfur alumyte containing the sulfur content of 1-3%, adding a compound additive used for desulfurization in the process of material proportioning, high pressure leaching, evaporation or decomposition and obtaining qualified finished aluminum hydroxide or alumina according to the prior process of the alumina production. Compared with the prior art, the invention has the advantages of direct application of the high-sulfur alumyte to the current alumina production, low cost, good desulfurization effect, simple operation, easy control, and the like.
Description
Technical field:
The invention belongs to the technical field of desulfurization in the alumina producing, particularly a kind of method of direct desulfurization in alumina production.
Background technology:
In the alumina producing Bayer process process, sulphur enters flow process meeting etching apparatus, increases the alkaline consumption energy consumption, hinder and produce normal operation, worsen the production control index, quality product is affected, therefore, high-sulfur bauxite can not be directly used in alumina producing, must carry out desulfurization and handle.At present, the method that high-sulfur bauxite is carried out desulfurization has ore dressing doctor treatment and desulfurization with roasting technique method.The ore dressing doctor treatment must drop into serial preparation equipment, the grinde ore degree is big, the organism type beneficiation reagent that uses also can cause secondary pollution, though desulfurization with roasting technique method energy effective elimination sulphur, but energy consumption is bigger, so these two kinds of sulfur methods are in the experimental study stage always, just because of the existence of factor like that, making high-sulphur alumyte desulfuration become alumina industry has technical barrier to be solved.
In alumina producing, the method for directly carrying out desulfurization has the barium salt of interpolation or zinc oxide.The price height of barium salt own adds to when carrying out desulfurization in the solution, and also inevitable the participation simultaneously of carbonate in the solution and silicon-dioxide reacted, and makes its consumption very big, causes its cost too high, can't realize aborning.
Adopt the method for adding zinc oxide desulfurization, though effect is good, it costs an arm and a leg, and cost is too high, and its application is restricted equally.For this reason, people select for use and contain zinc waste material such as blast-furnace dust or the powder that gathers dust and carry out desulfurization, and the plurality of impurities of carrying in these materials has caused bigger harm to alumina producing, and this method can not be realized in alumina producing equally.
Now because the alumina producing development is swift and violent, and bauxite has been given birth to crisis for mineral products, and high-sulfur bauxite will drop into application, so how the method for carrying out desulfurization in the alumina producing flow process also just becomes the essential difficult problem that solves of alumina producing development.
Summary of the invention:
The technical problem to be solved in the present invention is:
A kind of method of direct desulfurization in alumina production is provided, and main equipment, product are contaminated easily, desulphurization cost is high and energy consumption high-technology problem to need to increase in the solution prior art, and high-sulfur bauxite can directly be applied in the alumina producing.
The present invention takes following technical scheme:
In alumina producing, directly the employing sulphur content is 1～3% high-sulfur bauxite, in burden process, high pressure dissolving out process, evaporization process or decomposition process, add the composite additive that is used for desulfurization, can make qualified finished product aluminium hydroxide or aluminum oxide by former process for making alumina.(a kind of zinciferous ore, main chemical are Zn with lapis calaminaris
4(H
2O) [Si
2O
7] (OH)
2Usually also contain small amounts of Pb, Fe, Ca etc.) and lime in the ratio of 58%:42%, add in roll crusher, the disc refiner levigately, granularity is+100 orders≤10%; + 160 orders≤20%, the material thorough mixing after levigate promptly make the composite additive that is used for desulfurization after evenly.
Directly add composite additive when in burden process, joining the ore deposit, grind into raw pulp by former process for making alumina, after entering high pressure dissolving out process, enter red mud after sulphur and the composite additive reaction, the sodium aluminate solution that obtains continues to make finished product aluminium hydroxide or aluminum oxide by former process for making alumina.
The add-on of composite additive is 1～10% of a high-sulfur bauxite weight.
The composite additive that is used for desulfurization also can add in the mother liquid evaporation of the thick liquid of alumina producing stripping operation, evaporization process or in the seed precipitation solution of decomposition process.
The add-on of composite additive can be according to the content of sulphur in thick liquid, mother liquid evaporation or the seed precipitation solution, according to reaction Zn
2++ S
2-→ ZnS ↓ calculate, the add-on of composite additive is about 0.5～7.5g/l.。
The present invention compared with prior art has following advantage:
1, the present invention can directly be applied to high-sulfur bauxite current alumina producing, needn't increase operation and equipment.Compared with prior art, it need not carry out flotation, thereby has reduced cost, and has avoided organism to enter the secondary pollution that Production Flow Chart causes.In addition, do not need to carry out technologies such as roasting yet, can not cause the rising of energy consumption.
2, adopt the present invention to carry out desulfurization in alumina producing, cost is very low, but desulfurization is effective.
3, adopt the present invention to carry out desulfurization, easy and simple to handle, be easy to control, it can carry out at burden process, high pressure dissolving out process, evaporization process or decomposition process according to producing needs.Except the making of composite additive, increase the cost of production process hardly, solve people and wished the technical problem that directly applies to the high-sulfur ore deposit in the alumina producing and don't significantly increase production cost all the time.
Embodiment
Embodiments of the invention one:
Handle alumina silica ratio and be 10.8, when sulphur content is 1.92% high-sulfur ore deposit, at first preparation is used for the composite additive of desulfurization.In the ratio of lapis calaminaris 58%, lime 42%, add in roll crusher, the disc refiner levigately, granularity be+100 orders≤10% ,+160 orders≤20% after the material thorough mixing after levigate is even, is promptly made composite additive.With this composite additive and high-sulfur bauxite ratio in 2%: 98%, add in the alumina producing burden process, grind into raw pulp through the grid mill, enter high pressure dissolving out process.In the high pressure process in leaching, Zn
2+With S
2-Fully reaction generates the ZnS precipitation, and after sedimentation was filtered, the ZnS precipitation was effluxed with red mud, reaches the purpose of desulfurization.
Embodiments of the invention two:
With this composite additive and high-sulfur bauxite ratio in 5%: 95%, add in the alumina producing burden process, all the other steps are with embodiment one.
Embodiments of the invention three:
Handle alumina silica ratio and be 10.9, when sulphur content is 2.62% high-sulfur ore deposit, at first preparation is used for the composite additive of desulfurization.In the ratio of lapis calaminaris 80%, lime 20%, add in roll crusher, the disc refiner levigately, granularity be+100 orders≤10% ,+160 orders≤20% after the material thorough mixing after levigate is even, is promptly made composite additive.With this composite additive and high-sulfur bauxite ratio in 9%: 91%, add in the alumina producing burden process, grind into raw pulp through the grid mill, enter high pressure dissolving out process.In the high pressure process in leaching, Zn
2+With S
2-Fully reaction generates the ZnS precipitation, and after sedimentation was filtered, the ZnS precipitation was effluxed with red mud, reaches the purpose of desulfurization.
Embodiments of the invention four:
When being used for the thick liquid desulfurization of high pressure dissolving out process, at first preparation is used for the composite additive of desulfurization.In the ratio of lapis calaminaris 60%, lime 40%, add in roll crusher, the disc refiner levigately, granularity be+100 orders≤10% ,+160 orders≤20% after the material thorough mixing after levigate is even, is promptly made composite additive.
Composite additive is added in the thick liquid after the high pressure stripping, and the amount of adding is 0.6g/l, 95～105 ℃ of temperature, after 30 minutes, can finish desulphurization reaction.After sedimentation was filtered, the ZnS precipitation effluxed with red mud, reaches the desulfurization purpose.
Claims (5)
1. the method for a direct desulfurization in alumina production, it is characterized in that: in alumina producing, directly the employing sulphur content is 1～3% high-sulfur bauxite, in burden process, high pressure dissolving out process, evaporization process or decomposition process, add the composite additive that is used for desulfurization, can make qualified finished product aluminium hydroxide or aluminum oxide by former process for making alumina; Described composite additive is the ratio in lapis calaminaris 58%, lime 42%, perhaps in the ratio of lapis calaminaris 60%, lime 40%, perhaps in the ratio of lapis calaminaris 80%, lime 20%, add in roll crusher, the disc refiner levigate, granularity is+100 orders≤10%, + 160 orders≤20%, the material thorough mixing after levigate promptly make after evenly.
2. the method for direct desulfurization in alumina production according to claim 1 is characterized in that: directly add composite additive when joining the ore deposit in burden process.
3. the method for direct desulfurization in alumina production according to claim 2, it is characterized in that: the add-on of composite additive is 1～10% of a high-sulfur bauxite weight.
4. the method for direct desulfurization in alumina production according to claim 1 is characterized in that: the composite additive that is used for desulfurization also can directly add in the mother liquid evaporation of the thick liquid of alumina producing high pressure dissolving out process, evaporization process or in the seed precipitation solution of decomposition process.
5. the method for direct desulfurization in alumina production according to claim 4, it is characterized in that: the add-on of composite additive is 0.5～7.5g/l.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100687649A CN101597075B (en) | 2008-06-06 | 2008-06-06 | Method for direct desulfurization in alumina production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100687649A CN101597075B (en) | 2008-06-06 | 2008-06-06 | Method for direct desulfurization in alumina production |
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| Publication Number | Publication Date |
|---|---|
| CN101597075A CN101597075A (en) | 2009-12-09 |
| CN101597075B true CN101597075B (en) | 2011-09-07 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102674415A (en) * | 2012-04-24 | 2012-09-19 | 中国铝业股份有限公司 | Sulphur removal method in aluminum oxide production by bauxite |
| CN103588233B (en) * | 2012-08-16 | 2015-12-16 | 贵阳铝镁设计研究院有限公司 | A kind of high-sulfur seed precipitation solution strengthening salt discharge and desulfurization production device and method |
| CN104140119A (en) * | 2013-05-10 | 2014-11-12 | 中国科学院过程工程研究所 | Method for low temperature desulphurization of sodium aluminate solution |
-
2008
- 2008-06-06 CN CN2008100687649A patent/CN101597075B/en active Active
Non-Patent Citations (1)
| Title |
|---|
| 兰军等.铝土矿生产氧化铝过程脱硫方法的研究进展.《应用化工》.2008,第37卷(第4期),第446-448，455页. * |
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| CN101597075A (en) | 2009-12-09 |
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