CN100450931C - Carbonate-removing method in alumina production - Google Patents
Carbonate-removing method in alumina production Download PDFInfo
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- CN100450931C CN100450931C CNB2005102002854A CN200510200285A CN100450931C CN 100450931 C CN100450931 C CN 100450931C CN B2005102002854 A CNB2005102002854 A CN B2005102002854A CN 200510200285 A CN200510200285 A CN 200510200285A CN 100450931 C CN100450931 C CN 100450931C
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- salt
- carbonate
- pump
- caustic alkali
- high density
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Abstract
The present invention discloses a method and a device for removing carbonate during the alumina production. The device comprises salt removing equipment (a forced-circulation evaporator or flash evaporation tank), a salt settling tank, a high-concentration caustic alkali tank, a salt seed crystal pump, a lye pump and corresponding pipes. In the salt-removing process of the forced-circulation and the flash evaporation, a right quantity of carbonate seed crystals and high-concentration caustic alkali are added so as to improve the salt removing efficiency and obtain most anhydrous sodium carbonate with good settling and filtering properties in the removed salts.
Description
Technical field:
The present invention relates to a kind of is carbonate (Na in the bayer's process alumina producing of raw material with diaspore or boehmite
2CO
3) method for removing, belong to alumina producing salt discharge technical field.
Technical background:
In the process of producing aluminium oxide by bayer that with diaspore or boehmite is raw material, carbonate is constantly accumulation in the round-robin sodium aluminate solution, cause the alumina producing cycle efficiency to reduce, output reduces, after running up to certain degree, can on the heat exchange surface of equipment such as stripping, seminal fluid heat exchange, evaporation, separate out, make heat transfer efficiency reduce (energy consumption rising), even more serious is pipeline, etc. in separate out, valve causes the obstruction of pipeline, valve and forces production to be interrupted, and therefore must manage salt discharge.
Existing salt discharge technology has: timeliness salt discharge, five kinds of lateral flow causticization salt discharge, barium salt causticization, flash distillation salt discharge and pump circulation salt discharges.First three is planted salt discharge method and has the salt discharge weak effect respectively, causes that alumina loss is big, the salt discharge cost is high and environment had shortcoming such as pollution, should not adopt; Generally adopt back two kinds now, though back two kinds of salt discharge methods have overcome the drawback of first three kind substantially, the salt of exist discharging is that particle is little, the aqueous carbonic acid sodium (Na of sedimentation and strainability difference
2CO
3NH
2O), this not only causes the operational difficulty of subsequent handling and makes carbonate filter cake liquid holdup height, and has the salt of partly separating out to turn back to again in the round-robin sodium aluminate solution, thereby has reduced the salt discharge effect.
Summary of the invention:
The objective of the invention is to: a kind of an amount of crystal seed (carbonate) and method of high density caustic alkali of adding in the process of salt discharge is provided, and is the good anhydrous sodium carbonate (Na of sedimentation and strainability with the salt majority that improves the salt discharge effect and crystallization is separated out
2CO
3), reach and reduce carbonate eqrilibrium concentration (Na in the circulation fluid
2O
cCarbon alkali and Na
2O
TThe ratio of full alkali), improve the sedimentation of salt and the purpose of strainability and the liquid holdup that reduces the salt filter cake.
The present invention is achieved in that and adds an amount of carbonate crystal seed that in existing pump circulation salt discharge vaporizer and flash drum the salt that crystallization is separated out is most to be sedimentation and the good anhydrous sodium carbonate of strainability; In pump circulation and flash distillation, add an amount of high density caustic alkali, make caustic alkali (Na in the solution
2O
k) concentration reaches more than the 320g/l, make after the salt discharge in the solution below the carbonate eqrilibrium concentration to 6%.
Set up a salt crystal seed pump and set up a lye pump in existing salt settling groove one side, adopt above-mentioned two pumps and crystal seed and high density caustic alkali are sent into the salt discharge system by pipeline in high density caustic tank one side.
The present invention compared with prior art, have that can to make the salt crystallization be thicker sedimentation of particle and the good anhydrous carbonate of strainability, thereby improved the salt discharge effect greatly, and can reduce the liquid holdup of salt filter cake and the concentration of carbonate in the salt discharge solution is reduced to 6% with inferior advantage.
Description of drawings:
Accompanying drawing 1 is flash distillation salt discharge synoptic diagram of the present invention;
Accompanying drawing 2 is pump circulation salt discharge synoptic diagram of the present invention.
Wherein, 1, flash drum 2, salt settling groove 3, high density caustic tank 4, salt crystal seed pump 5, lye pump 6, crystallisation chamber 7, heating chamber
Embodiment:
Embodiments of the invention: existing aborning salt settling groove (2) one sides are set up a salt crystal seed pump (4) and are set up a lye pump (5) in high density caustic tank (3) one sides, adopt above-mentioned two pumps and crystal seed and high density caustic alkali are sent into flash drum (1) or send in the crystallisation chamber (6) or heating chamber (7) of pump feed evaporator by pipeline, the salt that crystallization is separated out is most to be sedimentation and the good anhydrous sodium carbonate of strainability; In pump circulation and flash vaporization process, causticity Na in the solution
2O
kConcentration do not reach salt discharge when requiring, add an amount of high density caustic alkali, make caustic alkali (Na in the solution
2O
k) concentration reaches more than the 320g/l, makes after the salt discharge that the salt equilibrium concentration drops to below 6% in the solution.
Claims (2)
1. the method for removing of carbonate in the alumina producing is characterized in that: in existing pump circulation salt discharge vaporizer or flash drum, add an amount of carbonate crystal seed, the salt that crystallization is separated out is most to be sedimentation and the good anhydrous sodium carbonate of strainability; In pump circulation or flash vaporization process, add an amount of high density caustic alkali, caustic alkali in the solution (Na20k) concentration is reached more than the 320g/l, make after the salt discharge that salt concn drops to below 6% in the solution.
2. according to the method for removing of carbonate in the described alumina producing of claim 1, it is characterized in that: set up a salt crystal seed pump and set up a lye pump in existing salt settling groove one side, adopt above-mentioned two pumps and crystal seed and high density caustic alkali are sent into the salt discharge system by pipeline in high density caustic tank one side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005102002854A CN100450931C (en) | 2005-05-18 | 2005-05-18 | Carbonate-removing method in alumina production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005102002854A CN100450931C (en) | 2005-05-18 | 2005-05-18 | Carbonate-removing method in alumina production |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1865148A CN1865148A (en) | 2006-11-22 |
| CN100450931C true CN100450931C (en) | 2009-01-14 |
Family
ID=37424321
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005102002854A Expired - Fee Related CN100450931C (en) | 2005-05-18 | 2005-05-18 | Carbonate-removing method in alumina production |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100450931C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100572278C (en) * | 2007-07-12 | 2009-12-23 | 中国铝业股份有限公司 | The method of expelling carbonate in a kind of alumina producing |
| CN104743586B (en) * | 2013-12-27 | 2017-11-14 | 中国科学院过程工程研究所 | The combine production method of the leaching of aluminium alkali and alumina decomposition mother liquid evaporation salt discharge in a kind of Bayer process red mud |
| CN111252790B (en) * | 2020-03-16 | 2022-05-13 | 中国铝业股份有限公司 | Improved method for evaporation and salting-out process of Bayer process high-carbon alkali solution |
| CN114105178A (en) * | 2020-12-23 | 2022-03-01 | 中铝中州铝业有限公司 | Method for improving organic carbon removal rate of Bayer process evaporation mother liquor |
| CN113213515A (en) * | 2021-05-10 | 2021-08-06 | 中国铝业股份有限公司 | Method and equipment for reducing carbon alkali |
| CN113912093B (en) * | 2021-09-29 | 2022-09-09 | 靖西天桂铝业有限公司 | Method for thickening evaporation mother liquor and discharging sodium carbonate salt in alumina production |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5624489A (en) * | 1995-01-23 | 1997-04-29 | National Research Council Of Canada | Conversion-preventing additive for high alumina cement products |
| CN1215697A (en) * | 1998-09-09 | 1999-05-05 | 贵州铝厂 | Method for boiling primary liquid of evaporator in production of aluminium oxide |
| CN1389400A (en) * | 2002-07-23 | 2003-01-08 | 中国铝业股份有限公司 | Alkali replenishing method during alumina production |
| CN1597528A (en) * | 2004-05-14 | 2005-03-23 | 中国铝业股份有限公司 | Carbon decomposed mother liquor high concentration crystallization evaporation method |
-
2005
- 2005-05-18 CN CNB2005102002854A patent/CN100450931C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5624489A (en) * | 1995-01-23 | 1997-04-29 | National Research Council Of Canada | Conversion-preventing additive for high alumina cement products |
| CN1215697A (en) * | 1998-09-09 | 1999-05-05 | 贵州铝厂 | Method for boiling primary liquid of evaporator in production of aluminium oxide |
| CN1389400A (en) * | 2002-07-23 | 2003-01-08 | 中国铝业股份有限公司 | Alkali replenishing method during alumina production |
| CN1597528A (en) * | 2004-05-14 | 2005-03-23 | 中国铝业股份有限公司 | Carbon decomposed mother liquor high concentration crystallization evaporation method |
Non-Patent Citations (2)
| Title |
|---|
| 山西铝厂拜耳法系统碳酸钠的危害及排除措施. 丁安平等.有色冶炼，第29卷第5期. 2000 |
| 山西铝厂拜耳法系统碳酸钠的危害及排除措施. 丁安平等.有色冶炼，第29卷第5期. 2000 * |
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|---|---|
| CN1865148A (en) | 2006-11-22 |
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| C14 | Grant of patent or utility model | ||
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| C56 | Change in the name or address of the patentee |
Owner name: GUIYANG ALUMINUM AND MAGNESIUM DESIGN INSTITUTE CO Free format text: FORMER NAME: GUIYANG ALUMINIUM AND MAGNESIUM DESIGN INST. |
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| CP03 | Change of name, title or address |
Address after: 550081 Guiyang Province, Jinyang New District, Zhu Zhu Road, No. 2 Patentee after: Guiyang Aluminum & Magnesium Design Institute Co., Ltd. Address before: 550004 No. 208, Beijing Road, Guiyang, Guizhou Patentee before: Guiyang Aluminium and Magnesium Design Inst. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
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