CN102464345B - Method for producing sandy alumina by using nepheline - Google Patents
Method for producing sandy alumina by using nepheline Download PDFInfo
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- CN102464345B CN102464345B CN 201010547656 CN201010547656A CN102464345B CN 102464345 B CN102464345 B CN 102464345B CN 201010547656 CN201010547656 CN 201010547656 CN 201010547656 A CN201010547656 A CN 201010547656A CN 102464345 B CN102464345 B CN 102464345B
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Abstract
The invention relates to a method for producing sandy alumina, in particular to a method for producing sandy alumina by using nepheline, which comprises the steps of: producing crude aluminium hydroxide from nepheline as a raw material by adopting a sintering method; and then producing the sandy alumina from the crude aluminium hydroxide by adopting a Bayer process. The invention has the advantages and beneficial effects that a serial connection production process for producing the sandy alumina by adopting sintering and Bayer processes is adopted, the sintering process is used for treating nepheline which can not be treated by adopting the Bayer process, the Bayer process is used for treating the crude aluminium hydroxide produced by adopting the sintering process, and by combining the sintering process with the Bayer process, the difficultly-treated nepheline is treated, and the alumina production with high quality is produced.
Description
Technical field
The present invention relates to a kind of method of producing sandy alumina, relate in particular to a kind of method of utilizing nepheline to produce sandy alumina.
Background technology
The method of present stage nepheline production aluminum oxide is take sintering process as main.What sintering process adopted till now is that process for desiliconizing crude liquid obtained by sinter is processed, and the seminal fluid after processing carries out simultaneously carbon and divides the method for dividing with the sintering process kind.The quality product of this technique is lower, cannot satisfy the production requirement of sandy alumina.
Summary of the invention
The present invention provides a kind of method of utilizing nepheline to produce sandy alumina in order to solve the problems of the technologies described above, it is high-quality that its purpose utilizes nepheline to produce exactly, is easy to the sandy alumina product that current Aluminum Electrolysis Production needs.
For reaching above-mentioned purpose, the present invention is achieved in that a kind of method of utilizing nepheline to produce sandy alumina, adopts the thick aluminium hydroxide of first sintering process output take nepheline as raw material, thicker aluminium hydroxide is produced sandy alumina with Bayer process.
Describedly adopt the thick aluminium hydroxide of first sintering process output to comprise take nepheline as raw material nepheline and lime are carried out clinkersintering, then carry out the grog stripping, separate and wash obtaining thick liquid after the grog stripping, thick liquid carries out the carbonating decomposition and obtains thick aluminium hydroxide.
Described carbonation decomposition course adds carbonic acid gas; Carbonating is decomposed the sodium carbonate solution that produces and is used for grog stripping step.
Describedly thick aluminium hydroxide is produced sandy alumina with Bayer process comprise thick aluminium hydroxide is carried out the low temperature stripping with the mixed liquid of alkali, the slurries of stripping obtain sodium aluminate solution after liquid-solid separating, washing slagging-off, simultaneously add the aluminium hydroxide of circulation do seed and solution is lowered the temperature in sodium aluminate solution, make it carry out decomposition of crystal seed, obtain aluminum hydroxide precipitation, aluminum hydroxide precipitation obtains aluminium hydroxide through separating, washing, then aluminium hydroxide is carried out obtaining sandy alumina after roasting.
The mixed liquid of described alkali is that new alkali and aluminum hydroxide precipitation are through the resulting circulation alkali of separating, washing.
Described aluminum hydroxide precipitation obtains aluminium hydroxide through separating, washing and partly does seed and carry out decomposition of crystal seed.
Advantage of the present invention and effect are as follows:
The present invention has adopted sintering and Bayer process to prepare the series connection production technique of sandy alumina, sintering process is processed the nepheline ore deposit that Bayer process can not be processed, Bayer process is processed the thick aluminium hydroxide of sintering process output, both have produced again high-quality alumina product in conjunction with both having processed reluctant nepheline ore deposit.
Description of drawings
Fig. 1 is schematic flow sheet of the present invention.
Embodiment
The below is described in detail by reference to the accompanying drawings to embodiments of the invention, but protection scope of the present invention is not limit by embodiment.
A kind of method of utilizing nepheline to produce sandy alumina, adopt the thick aluminium hydroxide of first sintering process output, thicker aluminium hydroxide produced sandy alumina with Bayer process take nepheline as raw material as shown in Figure 1.
Adopt the thick aluminium hydroxide of first sintering process output take nepheline as raw material, comprise nepheline and lime are carried out clinkersintering, carry out again the grog stripping, calcium-silicon slag to the grog stripping separates with hot water and washs, the separating, washing overflow is that thick liquid is sodium aluminate solution, the separating, washing underflow is red mud, and thick liquid carries out the carbonating decomposition and obtains thick aluminium hydroxide, adds carbonic acid gas at carbonation decomposition course; Carbonating is decomposed the sodium carbonate solution that produces and is divided two portions, and a part is through pervaporation, and another part is used for grog stripping step without evaporation after both collaborate.
thick aluminium hydroxide is produced sandy alumina with Bayer process to be comprised thick aluminium hydroxide is carried out the low temperature stripping with the mixed liquid of alkali, the slurries of stripping obtain sodium aluminate solution after liquid-solid separating, washing slagging-off, simultaneously add the aluminium hydroxide of circulation do seed and solution is lowered the temperature in sodium aluminate solution, make it carry out decomposition of crystal seed, obtain aluminum hydroxide precipitation, aluminum hydroxide precipitation obtains aluminium hydroxide through separating, washing, again aluminium hydroxide is carried out obtaining sandy alumina after roasting, the mixed liquid of alkali is that new alkali and aluminum hydroxide precipitation are through the resulting circulation alkali mixing solutions of separating, washing, aluminum hydroxide precipitation obtains aluminium hydroxide through separating, washing and partly does seed and carry out decomposition of crystal seed.
Claims (4)
1. a method of utilizing nepheline to produce sandy alumina, is characterized in that adopting the thick aluminium hydroxide of first sintering process output take nepheline as raw material, thicker aluminium hydroxide produced sandy alumina with Bayer process; Adopt the thick aluminium hydroxide of first sintering process output to comprise take nepheline as raw material nepheline and lime are carried out clinkersintering, then carry out the grog stripping, separate and wash obtaining thick liquid after the grog stripping, thick liquid carries out the carbonating decomposition and obtains thick aluminium hydroxide; Describedly thick aluminium hydroxide is produced sandy alumina with Bayer process comprise thick aluminium hydroxide is carried out the low temperature stripping with the mixed liquid of alkali, the slurries of stripping obtain sodium aluminate solution after liquid-solid separating, washing slagging-off, simultaneously add the aluminium hydroxide of circulation do seed and solution is lowered the temperature in sodium aluminate solution, make it carry out decomposition of crystal seed, obtain aluminum hydroxide precipitation, aluminum hydroxide precipitation obtains aluminium hydroxide through separating, washing, then aluminium hydroxide is carried out obtaining sandy alumina after roasting.
2. a kind of method of utilizing nepheline to produce sandy alumina according to claim 1, is characterized in that described carbonation decomposition course adds carbonic acid gas; Carbonating is decomposed the sodium carbonate solution that produces and is used for grog stripping step.
3. a kind of method of utilizing nepheline to produce sandy alumina according to claim 1, the mixed liquid that it is characterized in that described alkali are that new alkali and aluminum hydroxide precipitation are through the resulting circulation alkali of separating, washing.
4. a kind of method of utilizing nepheline to produce sandy alumina according to claim 1 is characterized in that described aluminum hydroxide precipitation obtains aluminium hydroxide through separating, washing and partly does seed and carry out decomposition of crystal seed.
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| CN 201010547656 CN102464345B (en) | 2010-11-17 | 2010-11-17 | Method for producing sandy alumina by using nepheline |
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| CN 201010547656 CN102464345B (en) | 2010-11-17 | 2010-11-17 | Method for producing sandy alumina by using nepheline |
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| CN102464345A CN102464345A (en) | 2012-05-23 |
| CN102464345B true CN102464345B (en) | 2013-11-06 |
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| CN110054207A (en) * | 2019-05-13 | 2019-07-26 | 贵州广铝氧化铝有限公司 | A kind of method of Bayer process production sandy alumina |
Citations (6)
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|---|---|---|---|---|
| SU460707A1 (en) * | 1973-03-29 | 1979-08-30 | Всесоюзный научно-исследовательский и проектный институт алюминиевой, магниевой и электродной промышленности | Process for the manufacture of aluminia |
| RU2043300C1 (en) * | 1992-11-20 | 1995-09-10 | Акционерное общество "Пикалевское объединение "Глинозем" | Method for production of alumina from nepheline materials |
| CN1562756A (en) * | 2004-03-19 | 2005-01-12 | 邝中 | Technique for extracting alumina from materiel containing calcium aluminate |
| CN101654271A (en) * | 2008-08-19 | 2010-02-24 | 沈阳铝镁设计研究院 | Method for producing sandy alumina from crude liquid by sintering method |
| CN101654267A (en) * | 2008-08-19 | 2010-02-24 | 沈阳铝镁设计研究院 | Method for preparing aluminum and coproducing cement from flyash |
| CN101845550A (en) * | 2010-04-12 | 2010-09-29 | 东北大学 | Method for extracting aluminum hydroxide and aluminum oxide from side product obtained by preparing magnesium metal by taking aluminum or aluminum alloy as reducing agent |
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2010
- 2010-11-17 CN CN 201010547656 patent/CN102464345B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU460707A1 (en) * | 1973-03-29 | 1979-08-30 | Всесоюзный научно-исследовательский и проектный институт алюминиевой, магниевой и электродной промышленности | Process for the manufacture of aluminia |
| RU2043300C1 (en) * | 1992-11-20 | 1995-09-10 | Акционерное общество "Пикалевское объединение "Глинозем" | Method for production of alumina from nepheline materials |
| CN1562756A (en) * | 2004-03-19 | 2005-01-12 | 邝中 | Technique for extracting alumina from materiel containing calcium aluminate |
| CN101654271A (en) * | 2008-08-19 | 2010-02-24 | 沈阳铝镁设计研究院 | Method for producing sandy alumina from crude liquid by sintering method |
| CN101654267A (en) * | 2008-08-19 | 2010-02-24 | 沈阳铝镁设计研究院 | Method for preparing aluminum and coproducing cement from flyash |
| CN101845550A (en) * | 2010-04-12 | 2010-09-29 | 东北大学 | Method for extracting aluminum hydroxide and aluminum oxide from side product obtained by preparing magnesium metal by taking aluminum or aluminum alloy as reducing agent |
Non-Patent Citations (3)
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| 冶金工业出版社《中国冶金百科全书》编辑部.霞石.《中国冶金百科全书：有色金属冶金》.冶金工业出版社,1999,899. * |
| 刘战伟等.霞石矿在氧化铝工业中的应用.《轻金属》.2008,(第12期),10-13. |
| 霞石矿在氧化铝工业中的应用;刘战伟等;《轻金属》;20081231(第12期);10-13 * |
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