CN102718239A - Method for improving cycle efficiency of Bayer alumina production - Google Patents
Method for improving cycle efficiency of Bayer alumina production Download PDFInfo
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- CN102718239A CN102718239A CN2012102058826A CN201210205882A CN102718239A CN 102718239 A CN102718239 A CN 102718239A CN 2012102058826 A CN2012102058826 A CN 2012102058826A CN 201210205882 A CN201210205882 A CN 201210205882A CN 102718239 A CN102718239 A CN 102718239A
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- cycle efficiency
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Abstract
The invention relates to a method for improving cycle efficiency of Bayer alumina production. The method is a production method for Bayer alumina, and particularly is used for improving the cycle efficiency of the Bayer process by changing treatment processes of primary washing liquor. The method is characterized in that the primary washing liquor of a red mud washing process of a Bayer alumina production process is divided into two parts, one part is added into dissolved-out ore pulp for ore pulp dilution, and the other part interflows with refined liquor of the Bayer alumina production process after being filtered for decomposition to produce alumina. By means of shunting of the primary washing liquor, control lower limit of the caustic ratio of dissolution serous is lowered, hydrolysis loss of a separation process is reduced, seed precipitation rate is improved, and accordingly the cycle efficiency of the Bayer alumina production is improved.
Description
Technical field
A kind of method that improves Bayer process alumina producing cycle efficiency relates to a kind of working method of Bayer process aluminum oxide, particularly through changing the treating processes of primary wash liquor, reaches the target that improves the Bayer process cycle efficiency.
Background technology
The Bayer process alumina producing is to make sodium aluminate solution with aluminum oxide in the caustic solution stripping bauxite, is lowering the temperature, is adding under crystal seed, the stirring condition, from solution, divides to parse white lake, and roasting obtains alumina product.Its result of extraction and rate of decomposition affect Bayer process alumina producing cycle efficiency.
At present, the growing tension of bauxite resource, the continuous decline of the ore grade of entering production process causes the red mud amount of alumina producing to increase greatly, and Bayer process key technical index cycle efficiency declines to a great extent.In order to realize the economic low consumption of Bayer process alumina producing, how under existence conditions, to improve cycle efficiency and become the key technique that everybody pays close attention to.
Summary of the invention
A kind of method that improves Bayer process alumina producing cycle efficiency is characterized in that the primary wash liquor of the laterite washing process of Bayer process aluminum oxide production process is divided into two portions, and a part wherein joins carries out the ore pulp dilution in the dissolved mineral slurry; Another part decomposes the production aluminum oxide through the seminal fluid interflow of filtration with the Bayer process aluminum oxide production process.
A kind of method that improves Bayer process alumina producing cycle efficiency of the present invention, it is characterized in that it joins carries out ore pulp dilution and is the 65%-80% of primary wash liquor total amount in the dissolved mineral slurry.
A kind of method that improves Bayer process alumina producing cycle efficiency of the present invention, it is characterized in that its through filter with seminal fluid interflow of Bayer process aluminum oxide production process be the 20%-35% of primary wash liquor total amount.
A kind of method that improves Bayer process alumina producing cycle efficiency of the present invention, through reduce dilution high causticity ratio value add-on, for the lower limit that reduces stripping slurries caustic ratio creates favorable conditions, stripping α k can be according to 1.30 ~ 1.38 controls; Primary wash liquor goes to decompose after the leaf filter is handled separately again with behind the seminal fluid interflow, reduces the concentration of decomposing stoste, helps the raising of rate of decomposition.Handle through the primary wash liquor shunting, reduce the lower limit of stripping slurries caustic ratio, reduced the hydrolysising loss of sepn process, improved and planted the branch rate of decomposition, thereby improve Bayer process alumina producing cycle efficiency.
Description of drawings
Fig. 1 is the process flow sheet of method of the present invention.
Embodiment
A kind of method that improves Bayer process alumina producing cycle efficiency at first adopts bayer's process to handle middle-low bauxite, reduces the add-on 20% ~ 35% of the primary wash liquor of high causticity ratio's value in the high pressure stripping slurry dilution process, obtains high density (N
K185 ~ 205g/l) Bayer process dilution ore pulp; Sepn process adopts swirler-to separate 20% ~ 50% dilution ore pulp; Separation tank is returned in the swirler-overflow; Realize low contain admittedly efficiently settlement separate of high density, create favorable conditions, reduce the hydrolysising loss of sepn process simultaneously for Bayer process stripping α k reduces; 20 ~ 35% primary wash liquor goes to decompose after the leaf filter is handled separately again with behind the seminal fluid interflow, can reduce the concentration of decomposing stoste, helps the raising of rate of decomposition.
Embodiment 1
Adopting A/S is 4.5 diaspore ore, and the control of Bayer process stripping slurries caustic ratio can 0.05 control on the low side, is reduced to 1.35, and back dilution operation reduces by 30% primary wash liquor amount, dilution ore pulp N
K198g/l.30% primary wash liquor decomposes with the seminal fluid interflow after the leaf filter is refining, and rate of decomposition improves 0.97%, and the Bayer process cycle efficiency improves 7.2kg/m
3
Embodiment 2
Employing A/S is 5 diaspore ore, and the control of Bayer process stripping slurries caustic ratio can be reduced to 1.36, and back dilution operation reduces by 25% primary wash liquor amount, dilution ore pulp N
K195g/l.30% primary wash liquor decomposes with the seminal fluid interflow after the leaf filter is refining, and rate of decomposition improves 0.95%, and the Bayer process cycle efficiency improves 5.8kg/m
3
Claims (3)
1. method that improves Bayer process alumina producing cycle efficiency is characterized in that the primary wash liquor of the laterite washing process of Bayer process aluminum oxide production process is divided into two portions, and a part wherein joins carries out the ore pulp dilution in the dissolved mineral slurry; Another part decomposes the production aluminum oxide through the seminal fluid interflow of filtration with the Bayer process aluminum oxide production process.
2. a kind of method that improves Bayer process alumina producing cycle efficiency according to claim 1, it is characterized in that it joins carries out ore pulp dilution and is the 65%-80% of primary wash liquor total amount in the dissolved mineral slurry.
3. a kind of method that improves Bayer process alumina producing cycle efficiency according to claim 1, it is characterized in that its through filter with seminal fluid interflow of Bayer process aluminum oxide production process be the 20%-35% of primary wash liquor total amount.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102058826A CN102718239A (en) | 2012-06-21 | 2012-06-21 | Method for improving cycle efficiency of Bayer alumina production |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012102058826A CN102718239A (en) | 2012-06-21 | 2012-06-21 | Method for improving cycle efficiency of Bayer alumina production |
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| CN102718239A true CN102718239A (en) | 2012-10-10 |
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| CN2012102058826A Pending CN102718239A (en) | 2012-06-21 | 2012-06-21 | Method for improving cycle efficiency of Bayer alumina production |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104058431A (en) * | 2014-06-27 | 2014-09-24 | 中国铝业股份有限公司 | Method for increasing aluminum oxide low-aluminum-silicon-ratio clinker dissolution rate |
| CN105836771A (en) * | 2016-03-23 | 2016-08-10 | 山东天维膜技术有限公司 | Method for improving seed decomposition rate and cycle efficiency in alumina production |
| CN112499656A (en) * | 2020-12-16 | 2021-03-16 | 贵州华锦铝业有限公司 | Treatment method of discharged salt causticization slurry in alumina production |
| CN113247925A (en) * | 2021-04-13 | 2021-08-13 | 广西田东锦鑫化工有限公司 | Process for reducing hydrolysis loss of alumina |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0618882B1 (en) * | 1991-12-27 | 1996-11-27 | Alcan International Limited | Improved process for separating red mud in production of alumina from bauxite |
| CN101264906A (en) * | 2008-04-25 | 2008-09-17 | 河南未来铝业（集团）有限公司 | Method for producing aluminum hydroxide or aluminum oxide by Bayer process |
| CN101648769A (en) * | 2008-08-12 | 2010-02-17 | 沈阳铝镁设计研究院 | Flow separation and leaf filtration process for red mud settlement separating coarse liquid and red mud washing liquid and system therefor |
-
2012
- 2012-06-21 CN CN2012102058826A patent/CN102718239A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0618882B1 (en) * | 1991-12-27 | 1996-11-27 | Alcan International Limited | Improved process for separating red mud in production of alumina from bauxite |
| CN101264906A (en) * | 2008-04-25 | 2008-09-17 | 河南未来铝业（集团）有限公司 | Method for producing aluminum hydroxide or aluminum oxide by Bayer process |
| CN101648769A (en) * | 2008-08-12 | 2010-02-17 | 沈阳铝镁设计研究院 | Flow separation and leaf filtration process for red mud settlement separating coarse liquid and red mud washing liquid and system therefor |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104058431A (en) * | 2014-06-27 | 2014-09-24 | 中国铝业股份有限公司 | Method for increasing aluminum oxide low-aluminum-silicon-ratio clinker dissolution rate |
| CN105836771A (en) * | 2016-03-23 | 2016-08-10 | 山东天维膜技术有限公司 | Method for improving seed decomposition rate and cycle efficiency in alumina production |
| CN112499656A (en) * | 2020-12-16 | 2021-03-16 | 贵州华锦铝业有限公司 | Treatment method of discharged salt causticization slurry in alumina production |
| CN113247925A (en) * | 2021-04-13 | 2021-08-13 | 广西田东锦鑫化工有限公司 | Process for reducing hydrolysis loss of alumina |
| CN113247925B (en) * | 2021-04-13 | 2022-11-01 | 广西田东锦鑫化工有限公司 | Process for reducing hydrolysis loss of alumina |
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Application publication date: 20121010 |