CN102417197A - Method for producing sandy alumina by fly ash - Google Patents
Method for producing sandy alumina by fly ash Download PDFInfo
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- CN102417197A CN102417197A CN2010102942678A CN201010294267A CN102417197A CN 102417197 A CN102417197 A CN 102417197A CN 2010102942678 A CN2010102942678 A CN 2010102942678A CN 201010294267 A CN201010294267 A CN 201010294267A CN 102417197 A CN102417197 A CN 102417197A
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Abstract
The invention relates to a method for producing sandy alumina, especially to a method for producing sandy alumina by high-alumina fly ash. The method for producing sandy alumina by fly ash comprises the following steps of: carrying out acid-leaching on the fly ash raw material by using acid, followed by desiliconization and crystal thermal decomposition to obtain crude alumina, carrying out alkali dissolution on the crude alumina by using an alkali regulating solution, carrying out liquid-solid separation on the dissolved slurry, filtering and removing slag to obtain a sodium aluminate solution, adding aluminium hydroxide as seed into the sodium aluminate solution, cooling the sodium aluminate solution for seed precipitation so as to obtain an aluminium hydroxide precipitate, carrying out liquid-solid separation on the aluminium hydroxide precipitate, followed by washing to obtain aluminium hydroxide, and roasting aluminium hydroxide to obtain sandy alumina. By a serial production technology of preparing crude alumina by an acid method and preparing sandy alumina by an alkali method, the material cycle for alumina extraction by the acid method is less with less amount of slag; energy consumption for low-temperature alkali dissolution is low; the flow and material adoption are simple; and the quality of aluminium hydroxide and the alumina product prepared by the seed precipitation technology is high.
Description
Technical field
The present invention relates to a kind of method of producing sandy alumina, relate in particular to the method that aluminous fly-ash is produced sandy alumina.
Background technology
Present stage flyash production method of alumina is main with acid system and alkaline process or using acid and alkali combination method.The aluminum oxide impurity that independent acid system flow process is produced is more; Soda-lime sintering process has a large amount of calcium-silicon slags to be difficult to handle; The aluminum oxide of existing soda acid combination producing all is that the alumina product that decomposes with carbonating is main, and quality product is lower, does not reach the requirement of producing sandy alumina.
Summary of the invention
The present invention is exactly the method that provides a kind of flyash to produce sandy alumina in order to solve the problems of the technologies described above, and its purpose is exactly to utilize flyash to produce high quality and be easy to the sandy alumina product that current Aluminum Electrolysis Production needs.
For reaching above-mentioned purpose, the present invention realizes through following technical proposals:
Flyash is produced the method for sandy alumina; Powdered coal ash is carried out acidleach with acid; Through obtaining thick aluminum oxide after desiliconization and the crystallization pyrolysis; And then use alkali liquor preparing liquid that thick aluminum oxide is carried out alkali to dissolve, the slurries of stripping are carried out liquid-solid separation and filter cleaner obtains sodium aluminate solution, add in sodium aluminate solution that white lake is done crystal seed and sodium aluminate solution cooling carrying out seed decomposed and obtain aluminum hydroxide precipitation; Aluminum hydroxide precipitation is carried out obtaining white lake after liquid-solid separation and the washing, and white lake carries out obtaining sandy alumina after the roasting.
The acid that described powdered coal ash carries out in the acidleach with acid is sulfuric acid or hydrochloric acid.
Described alkali liquor preparing liquid is to be allocated by the circulation alkali liquor that carries out obtaining in solid-liquid separation and the washing after new alkali and the seed decomposition to obtain.
Described thick aluminum oxide alkali dissolves and is meant the low temperature stripping process by Bayer process.
Described low temperature Bayer process stripping temperature is 110-150 ℃.
The concentration of described low temperature Bayer process stripping alkali is with Na
2O counts 150-250g/L.
The decomposition temperature of described sodium aluminate decomposition of crystal seed is 80-60 ℃.
The alkali concn of described sodium aluminate decomposition of crystal seed is with Na
2O counts 130-190g/L.
Described alkali liquor preparing liquid carries out lowering the temperature when alkali dissolves to thick aluminum oxide.
Crystal seed when the white lake part of carrying out obtaining in solid-liquid separation and the washing after described seed decomposes is decomposed as seed.
Advantageous effect of the present invention: the present invention has adopted acid system to prepare the series connection production technique that thick aluminum oxide and alkaline process prepare sandy alumina; The material circulation that acid system extracts aluminum oxide is few; The quantity of slag is little; Low-temperature alkaline stripping energy consumption is low, and flow process and materials are simple, adopts the white lake of seed decomposition technique preparation and alumina product quality high.
Description of drawings
Fig. 1 is a schema of the present invention.
Embodiment
Combine accompanying drawing to describe in detail in the face of embodiments of the invention down, but protection scope of the present invention is not limit by embodiment.
As shown in Figure 1; Flyash of the present invention is produced the method for sandy alumina; Adopt ordinary method that powdered coal ash is carried out acidleach with acid, through obtaining thick aluminum oxide after ordinary method desiliconization and the crystallization pyrolysis, and then use alkali liquor preparing liquid that thick aluminum oxide is carried out alkali to dissolve; The slurries of stripping are carried out liquid-solid separation and filter cleaner obtains sodium aluminate solution; Add in sodium aluminate solution that white lake is done crystal seed and sodium aluminate solution cooling carrying out seed decomposed and obtain aluminum hydroxide precipitation, aluminum hydroxide precipitation is carried out obtaining white lake after liquid-solid separation and the washing, white lake carries out obtaining sandy alumina after the roasting.
The acid that powdered coal ash carries out in the acidleach with acid is sulfuric acid or hydrochloric acid; Alkali liquor preparing liquid is that the circulation alkali that carries out obtaining in solid-liquid separation and the washing after being decomposed by new alkali and seed is allocated gained; Thick aluminum oxide alkali dissolves and is meant the low temperature stripping process by Bayer process, and low temperature Bayer process stripping temperature is 110-150 ℃, and the concentration of low temperature Bayer process stripping alkali is with Na
2O counts 150-250g/L; The decomposition temperature of sodium aluminate decomposition of crystal seed is 80-60 ℃, and the alkali concn of sodium aluminate decomposition of crystal seed is with Na
2O counts 130-190g/L; Alkali liquor preparing liquid carries out lowering the temperature when alkali dissolves to thick aluminum oxide; Crystal seed when the white lake part of carrying out obtaining in solid-liquid separation and the washing after seed decomposes is decomposed as seed.
Claims (10)
1. flyash is produced the method for sandy alumina; It is characterized in that powdered coal ash is carried out acidleach with acid; Through obtaining thick aluminum oxide after desiliconization and the crystallization pyrolysis; And then use alkali liquor preparing liquid that thick aluminum oxide is carried out alkali to dissolve, the slurries of stripping are carried out liquid-solid separation and filter cleaner obtains sodium aluminate solution, add in sodium aluminate solution that white lake is done crystal seed and sodium aluminate solution cooling carrying out seed decomposed and obtain aluminum hydroxide precipitation; Aluminum hydroxide precipitation is carried out obtaining white lake after liquid-solid separation and the washing, and white lake carries out obtaining sandy alumina after the roasting.
2. flyash according to claim 1 is produced the method for sandy alumina, it is characterized in that the acid that described powdered coal ash carries out in the acidleach with acid is sulfuric acid or hydrochloric acid.
3. flyash according to claim 1 is produced the method for sandy alumina, it is characterized in that described alkali liquor preparing liquid is that the circulation alkali that carries out obtaining in solid-liquid separation and the washing after being decomposed by new alkali and seed is allocated gained.
4. flyash according to claim 1 is produced the method for sandy alumina, it is characterized in that the molten low temperature stripping process by Bayer process that is meant of described thick aluminum oxide alkali.
5. flyash according to claim 4 is produced the method for sandy alumina, it is characterized in that described low temperature Bayer process stripping temperature is 110-150 ℃.
6. flyash according to claim 4 is produced the method for sandy alumina, and the concentration that it is characterized in that described low temperature Bayer process stripping alkali is with Na
2O counts 150-250g/L.
7. flyash according to claim 1 is produced the method for sandy alumina, and the decomposition temperature that it is characterized in that described sodium aluminate decomposition of crystal seed is 80-60 ℃.
8. flyash according to claim 1 is produced the method for sandy alumina, and the alkali concn that it is characterized in that described sodium aluminate decomposition of crystal seed is with Na
2O counts 130-190g/L.
9. flyash according to claim 1 is produced the method for sandy alumina, it is characterized in that described alkali liquor preparing liquid carries out lowering the temperature when alkali dissolves to thick aluminum oxide.
10. flyash according to claim 1 is produced the method for sandy alumina, it is characterized in that the crystal seed when the white lake part of carrying out obtaining in solid-liquid separation and the washing after described seed decomposes is decomposed as seed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2010102942678A CN102417197A (en) | 2010-09-28 | 2010-09-28 | Method for producing sandy alumina by fly ash |
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| CN2010102942678A CN102417197A (en) | 2010-09-28 | 2010-09-28 | Method for producing sandy alumina by fly ash |
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| CN102417197A true CN102417197A (en) | 2012-04-18 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102732662A (en) * | 2012-06-02 | 2012-10-17 | 胡长春 | Slag-free production process using bauxite or red mud |
| CN103693665A (en) * | 2012-12-28 | 2014-04-02 | 中国神华能源股份有限公司 | Method for preparing high-purity aluminum oxide from fly ash |
| CN104787788A (en) * | 2015-01-15 | 2015-07-22 | 北京矿冶研究总院 | Method for producing alumina from high-alumina fly ash |
| CN104787789A (en) * | 2015-01-15 | 2015-07-22 | 北京矿冶研究总院 | Method for producing alumina by using coal-based solid waste |
| CN104944457A (en) * | 2015-06-18 | 2015-09-30 | 淄博鹏丰铝业有限公司 | Preparation method of aluminum hydroxide micro powder with high thermal stability |
| CN106966415A (en) * | 2017-03-29 | 2017-07-21 | 西安航天动力试验技术研究所 | The process of aluminum oxide in a kind of acidity extraction coal-powder boiler flyash |
| CN107385224A (en) * | 2017-08-04 | 2017-11-24 | 攀钢集团研究院有限公司 | It is a kind of that the method that aluminium is reclaimed in corundum slag is smelted from vanadium iron |
| CN108455638A (en) * | 2018-01-25 | 2018-08-28 | 大唐国际发电股份有限公司高铝煤炭资源开发利用研发中心 | A method of producing aluminum and coproducing 4A zeolite molecular sieves |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101397146A (en) * | 2007-09-29 | 2009-04-01 | 沈阳铝镁设计研究院 | Method for preparing alumina by using fly ash |
-
2010
- 2010-09-28 CN CN2010102942678A patent/CN102417197A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101397146A (en) * | 2007-09-29 | 2009-04-01 | 沈阳铝镁设计研究院 | Method for preparing alumina by using fly ash |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102732662A (en) * | 2012-06-02 | 2012-10-17 | 胡长春 | Slag-free production process using bauxite or red mud |
| CN103693665A (en) * | 2012-12-28 | 2014-04-02 | 中国神华能源股份有限公司 | Method for preparing high-purity aluminum oxide from fly ash |
| CN103693665B (en) * | 2012-12-28 | 2015-11-18 | 中国神华能源股份有限公司 | A kind of coal ash for manufacturing is for the method for high purity aluminium oxide |
| CN104787788A (en) * | 2015-01-15 | 2015-07-22 | 北京矿冶研究总院 | Method for producing alumina from high-alumina fly ash |
| CN104787789A (en) * | 2015-01-15 | 2015-07-22 | 北京矿冶研究总院 | Method for producing alumina by using coal-based solid waste |
| CN104787788B (en) * | 2015-01-15 | 2016-03-02 | 北京矿冶研究总院 | Method for producing alumina from high-alumina fly ash |
| CN104787789B (en) * | 2015-01-15 | 2016-03-30 | 北京矿冶研究总院 | Method for producing alumina by using coal-based solid waste |
| CN104944457A (en) * | 2015-06-18 | 2015-09-30 | 淄博鹏丰铝业有限公司 | Preparation method of aluminum hydroxide micro powder with high thermal stability |
| CN106966415A (en) * | 2017-03-29 | 2017-07-21 | 西安航天动力试验技术研究所 | The process of aluminum oxide in a kind of acidity extraction coal-powder boiler flyash |
| CN107385224A (en) * | 2017-08-04 | 2017-11-24 | 攀钢集团研究院有限公司 | It is a kind of that the method that aluminium is reclaimed in corundum slag is smelted from vanadium iron |
| CN107385224B (en) * | 2017-08-04 | 2019-04-26 | 攀钢集团研究院有限公司 | A method of it is smelted from vanadium iron and recycles aluminium in corundum slag |
| CN108455638A (en) * | 2018-01-25 | 2018-08-28 | 大唐国际发电股份有限公司高铝煤炭资源开发利用研发中心 | A method of producing aluminum and coproducing 4A zeolite molecular sieves |
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Application publication date: 20120418 |