CN102730725A - Method for improving caustic ratio of Barer process seeded precipitation mother solution - Google Patents
Method for improving caustic ratio of Barer process seeded precipitation mother solution Download PDFInfo
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- CN102730725A CN102730725A CN2012102058722A CN201210205872A CN102730725A CN 102730725 A CN102730725 A CN 102730725A CN 2012102058722 A CN2012102058722 A CN 2012102058722A CN 201210205872 A CN201210205872 A CN 201210205872A CN 102730725 A CN102730725 A CN 102730725A
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- mother solution
- barer
- mother liquor
- bayer
- seeded precipitation
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Abstract
The invention which discloses a method for improving the caustic ratio of a Barer process seeded precipitation mother solution relates to an improvement of a technology for producing alumina through a Barer process. The method is characterized in that lime is added to the Barer process seeded precipitation mother solution and subjected to a reaction, filter separation is carried out, the resulting separated filtrate is evaporated through an evaporation procedure, the evaporated filtrate is used to dissolve out a next batch of bauxite as a cycle mother solution, and a solid phase is separated through flushing with the cycle mother solution to a pre-desilicication adjustment tank to adjust the solid content in a desilicication slurry. The method of the invention, which allows calcium aluminate to be generated through adding lime to the Barer process seeded precipitation mother solution and reacting with a sodium aluminate solution, enables the concentration of alumina in the seeded precipitation mother solution to be reduced, so the caustic ratio of the seeded precipitation mother solution is improved, and a Barer process cycle efficiency improvement purpose is reached. Calcium aluminate generated in the reaction is settled and filtered, returns to the Barer process production flow, and is added to the pre-desilicication adjustment tank to substitute parts of lime. Energy consumed by evaporating the low-alumina-concentration seeded precipitation mother solution can be reduced.
Description
Technical field
A kind of method that improves the Bayer-process seed-separating mother liquor caustic ratio relates to a kind of improvement of alumina producing Bayer process technology.
Background technology
Along with developing rapidly of aluminum oxide industry, bauxite resource is fewer and feweri, and grade constantly descends, and the benefit of aluminum oxide enterprise constantly descends, the production and technical indication variation, and cost rises, and has seriously restricted the development of enterprise.The optimization production flow process is improved technic index, enhances productivity, and reducing to produce to consume becomes the important channel of improving enterprise competitiveness.
At present, reduce under the alumina silica ratio 5 following situation at bauxite grade, it is continuous to make Bayer process produce each working-procedure problem, and ordinary production receives very big influence, and technic index glides, and especially the Bayer process cycle efficiency is by original 160kg/m
3Drop to present 130kg/m
3About, the aluminum oxide output capacity reduces, and production efficiency descends.
Summary of the invention
The objective of the invention is deficiency to above-mentioned prior art existence; Provide a kind of and can effectively reduce alumina concentration in the solution, improve the caustic ratio of seed precipitation solution, improve the Bayer process cycle efficiency; Technology is simple, and outstanding effect improves the method for Bayer-process seed-separating mother liquor caustic ratio.
The present invention realizes through following technical scheme.
A kind of method that improves the Bayer-process seed-separating mother liquor caustic ratio; It is characterized in that it being, carry out filtering separation, after the evaporation of separating filtrate devaporation operation after interpolation lime reacts in the Bayer-process seed-separating mother liquor; As circulating mother liquor stripping next batch bauxite; Separate solid phase and dash to preparatory desiliconization adjustment groove, be used to adjust consolidating of desiliconization slurries and contain, and add effect after playing instead of part lime with the Bayer process circulating mother liquor.
A kind of method that improves the Bayer-process seed-separating mother liquor caustic ratio of the present invention is characterized in that in the Bayer-process seed-separating mother liquor adding the amount CaO:AL of lime
2O
3Molecular ratio 1:1 is to 3:1.
A kind of method that improves the Bayer-process seed-separating mother liquor caustic ratio of the present invention is characterized in that the time that interpolation lime reacts in the Bayer-process seed-separating mother liquor is 10-30 minute.
A kind of method that improves the Bayer-process seed-separating mother liquor caustic ratio of the present invention is added lime in Bayer-process seed-separating mother liquor, stir, and reaction generates the calcium aluminate material, reduces the alumina content in the seed precipitation solution, thereby improves the caustic ratio of seed precipitation solution.Filtering separation calcium aluminate material dashes to adjusting groove after the desiliconization in advance with circulation alkali liquor, adds effect after playing instead of part lime, and minimizing lime consumption, and the seed precipitation solution devaporation of lower concentration can improve steam capability.
Description of drawings
Fig. 1 is the process flow sheet of method of the present invention.
Embodiment
A kind of method that improves the Bayer-process seed-separating mother liquor caustic ratio; After interpolation lime reacts in the Bayer-process seed-separating mother liquor; Carry out filtering separation, after the evaporation of separating filtrate devaporation operation, as circulating mother liquor stripping next batch bauxite; Separate solid phase and dash to desiliconization in advance with the Bayer process circulating mother liquor and adjust groove, be used to adjust consolidating of desiliconization slurries contain and play instead of part lime after add effect.
Embodiment 1
Seed precipitation solution behind the bayer process seed adds lime (molecular ratio CaO:AL
2O
3Be 1:1); In the hybrid reaction groove, carry out 30 minutes stirring reaction time; Get into filter and filter, after the evaporation of filtrating devaporation operation, as circulating mother liquor stripping next batch bauxite; The solid matter calcium aluminate dashes to desiliconization adjustment groove in advance with the Bayer process circulating mother liquor, the consolidating of adjustment desiliconization slurries contain and play instead of part lime after add effect.
Embodiment 2
Seed precipitation solution behind the bayer process seed adds lime (molecular ratio CaO:AL
2O
3Be 2:1); In the hybrid reaction groove, carry out 20 minutes stirring reaction time; Get into filter and filter, after the evaporation of filtrating devaporation operation, as circulating mother liquor stripping next batch bauxite; The solid matter calcium aluminate dashes to desiliconization adjustment groove in advance with the Bayer process circulating mother liquor, the consolidating of adjustment desiliconization slurries contain and play instead of part lime after add effect.
Embodiment 3
Seed precipitation solution behind the bayer process seed adds lime (molecular ratio CaO:AL
2O
3Be 3:1); In the hybrid reaction groove, carry out 10 minutes stirring reaction time; Get into filter and filter, after the evaporation of filtrating devaporation operation, as circulating mother liquor stripping next batch bauxite; The solid matter calcium aluminate dashes to desiliconization adjustment groove in advance with the Bayer process circulating mother liquor, the consolidating of adjustment desiliconization slurries contain and play instead of part lime after add effect.
Claims (3)
1. method that improves the Bayer-process seed-separating mother liquor caustic ratio; It is characterized in that it being with after interpolation lime reacts in the Bayer-process seed-separating mother liquor; Carry out filtering separation, after the evaporation of separating filtrate devaporation operation, as circulating mother liquor stripping next batch bauxite; Separate solid phase and dash to preparatory desiliconization adjustment groove, be used to adjust consolidating of desiliconization slurries and contain with the Bayer process circulating mother liquor.
2. a kind of method that improves the Bayer-process seed-separating mother liquor caustic ratio according to claim 1 is characterized in that the amount of interpolation lime in the Bayer-process seed-separating mother liquor is CaO:AL
2O
3Molecular ratio=1:1 is to 3:1=.
3. a kind of method that improves the Bayer-process seed-separating mother liquor caustic ratio according to claim 1 is characterized in that the time that interpolation lime reacts in the Bayer-process seed-separating mother liquor is 10-30 minute.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012102058722A CN102730725A (en) | 2012-06-21 | 2012-06-21 | Method for improving caustic ratio of Barer process seeded precipitation mother solution |
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| CN2012102058722A CN102730725A (en) | 2012-06-21 | 2012-06-21 | Method for improving caustic ratio of Barer process seeded precipitation mother solution |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103030161A (en) * | 2012-12-21 | 2013-04-10 | 中南大学 | Application of filter cake of leaf filter |
| CN103934258A (en) * | 2014-04-30 | 2014-07-23 | 东北大学 | Method for recycling alkali and aluminum in process of treating bayer red mud by calcification-carbonization method |
| CN103950960A (en) * | 2014-04-30 | 2014-07-30 | 东北大学 | Method for producing aluminum oxide without evaporating by calcification-carbonization process |
| CN103964478A (en) * | 2014-04-30 | 2014-08-06 | 东北大学 | Calcification-carbonization method for treating low-middle grade aluminiferous raw material and aluminum cycle |
| RU2560412C2 (en) * | 2013-11-15 | 2015-08-20 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Национальный минерально-сырьевой университет "Горный" | Method of aluminate solutions desiliconisation |
| CN103936046B (en) * | 2014-04-30 | 2015-11-25 | 东北大学 | The method of ore deposit calcification transition is added after in a kind of aluminum oxide production process |
| CN110866659A (en) * | 2019-12-09 | 2020-03-06 | 东北大学 | On-line prediction method for caustic ratio in dissolution process of high-pressure pipeline in Bayer-process alumina production |
| CN111204787A (en) * | 2020-02-05 | 2020-05-29 | 中铝中州铝业有限公司 | Method for joint production of aluminum oxide and steel refining slag |
| CN113856507A (en) * | 2021-10-18 | 2021-12-31 | 中铝矿业有限公司 | Imported bauxite pulp preparation device and method |
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| CN1217294A (en) * | 1997-11-07 | 1999-05-26 | 中南工业大学 | Wet chemical pretreatment process |
| CN1405092A (en) * | 2002-11-12 | 2003-03-26 | 中国铝业股份有限公司 | Bayer combination production method for aluminium and calcium aluminate cement |
| CN1405088A (en) * | 2002-11-12 | 2003-03-26 | 中国铝业股份有限公司 | Alkali-compensating method in process of aluminium oxide |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103030161B (en) * | 2012-12-21 | 2015-04-08 | 中南大学 | Application of filter cake of leaf filter |
| CN103030161A (en) * | 2012-12-21 | 2013-04-10 | 中南大学 | Application of filter cake of leaf filter |
| RU2560412C2 (en) * | 2013-11-15 | 2015-08-20 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Национальный минерально-сырьевой университет "Горный" | Method of aluminate solutions desiliconisation |
| CN103964478B (en) * | 2014-04-30 | 2015-11-04 | 东北大学 | The method of a kind of calcification-carborization process middle-low grade aluminum-containing raw material and aluminium circulation |
| CN103964478A (en) * | 2014-04-30 | 2014-08-06 | 东北大学 | Calcification-carbonization method for treating low-middle grade aluminiferous raw material and aluminum cycle |
| CN103950960A (en) * | 2014-04-30 | 2014-07-30 | 东北大学 | Method for producing aluminum oxide without evaporating by calcification-carbonization process |
| CN103934258A (en) * | 2014-04-30 | 2014-07-23 | 东北大学 | Method for recycling alkali and aluminum in process of treating bayer red mud by calcification-carbonization method |
| CN103936046B (en) * | 2014-04-30 | 2015-11-25 | 东北大学 | The method of ore deposit calcification transition is added after in a kind of aluminum oxide production process |
| CN103950960B (en) * | 2014-04-30 | 2016-01-20 | 东北大学 | A kind of method of producing aluminum oxide without evaporation based on calcification-carborization |
| CN103934258B (en) * | 2014-04-30 | 2016-04-06 | 东北大学 | The recovery method of alkali and aluminium in calcification-carbonizatin method process Bayer process red mud process |
| CN110866659A (en) * | 2019-12-09 | 2020-03-06 | 东北大学 | On-line prediction method for caustic ratio in dissolution process of high-pressure pipeline in Bayer-process alumina production |
| CN110866659B (en) * | 2019-12-09 | 2023-08-15 | 东北大学 | On-line prediction method for caustic ratio in high-pressure pipeline digestion process of Bayer process alumina production |
| CN111204787A (en) * | 2020-02-05 | 2020-05-29 | 中铝中州铝业有限公司 | Method for joint production of aluminum oxide and steel refining slag |
| CN113856507A (en) * | 2021-10-18 | 2021-12-31 | 中铝矿业有限公司 | Imported bauxite pulp preparation device and method |
| CN113856507B (en) * | 2021-10-18 | 2024-04-02 | 中铝矿业有限公司 | Imported bauxite pulp preparation device and method |
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Application publication date: 20121017 |