CN102992368B - Purification method for removing sodium in aluminum hydroxide micropowder - Google Patents
Purification method for removing sodium in aluminum hydroxide micropowder Download PDFInfo
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- CN102992368B CN102992368B CN201210466921.8A CN201210466921A CN102992368B CN 102992368 B CN102992368 B CN 102992368B CN 201210466921 A CN201210466921 A CN 201210466921A CN 102992368 B CN102992368 B CN 102992368B
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Abstract
The invention discloses a purification method for removing impurity sodium in aluminum hydroxide micropowder and belongs to a method for improving the purity of the aluminum hydroxide micropowder. The method comprises the following steps of: filtering aluminum hydroxide micropowder slurry obtained by decomposition reaction of a sodium aluminate solution; adding the filtered material into hot water for dispersing to obtain a mixed solution; adding a penetrating agent with the weight being 0.005-0.01 time that of the mixed solution, stirring, and reacting for 3h; and adding a dispersing agent with the weight being 0.0005-0.005 time that of the mixed solution, stirring, reacting for 1h, filtering, and washing, wherein the reaction temperature is 70-90 degrees, the penetrating agent is selected from one of pyrophosphoric acid, oxalic acid, benzenesulfonic acid, formic acid, dicarboxylic acid, tannic acid, citric acid and tartaric acid, the dispersing agent is selected from one of nitric acid, hydrochloric acid, sulfuric acid, phosphoric acid, hypochlorous acid, perchloric acid and acetic acid, and the concentrations of the penetrating agent and the dispersing agent meet the chemical agent concentration. According to the method, the sodium removal effect is good, the water consumption is small and the cost is low, so that the method can be used for improving the purity of the aluminum hydroxide micropowder.
Description
Technical field
The present invention relates to a kind of method that improves fine aluminum hydroxide powder purity, relate in particular to a kind of method of removing impurity natrium in fine aluminum hydroxide powder.
background technology:fine aluminum hydroxide powder is widely used in the industries such as filler, pottery, medicine and coating as a kind of inorganic chemical industry material; The aluminum hydroxide slurry that it is obtained by decomposing sodium aluminate solution, carries out separation, hot water secondary backflush and obtains through filter.The height of sodium content has determined the quality of aluminium hydroxide product.In seed precipitation process, in aluminum hydroxide crystals, containing some crystalline alkali, some adheres to alkali its surface.By washing methods, can make to adhere to alkali and significantly reduce, but the crystalline alkali in aluminum hydroxide crystals is difficult to remove, and becomes one of major impurity affecting product quality.
Ordinary hydrogen alumina product granularity is large, and attached water amount is in 15% left and right, and it is easy that alkali is adhered in cleaning; And fine aluminum hydroxide powder attached water amount is in about 30-40%, clean that to adhere to alkali more difficult, water consumption is large.Its sodium oxide content of the fine aluminum hydroxide powder that common washing methods obtains is 0.1～0.3%, and bath water amount is generally 6～10m
3.
summary of the invention:for the above-mentioned defect existing in prior art, the present invention aims to provide a kind of except sodium is effective, efficiency is high, bath water amount is few fine aluminum hydroxide powder is except sodium purifying method.
In order to realize foregoing invention object, the present invention by the following technical solutions:
1) the fine aluminum hydroxide powder slurries that decomposing sodium aluminate solution reaction obtained filter, and obtain filtrate;
2) above-mentioned filtrate is added and in the hot water of 70～90 ℃, change loosely, obtain mixed solution;
3) to the permeate agent that adds 0.005～0.01 times of weight in mixed solution, fully stir, react after 3 hours and add again the dispersion agent of 0.0005～0.005 times of weight, fully stir, react filtration after 1 hour, wash; The temperature of two secondary responses is 70～90 ℃, described permeate agent is a kind of in tetra-sodium, oxalic acid, Phenylsulfonic acid, formic acid, dioctyl phthalate, tannic acid, citric acid, tartrate, a kind of in described dispersion agent nitric acid, hydrochloric acid, sulfuric acid, phosphoric acid, hypochlorous acid, perchloric acid, acetic acid.
Compared with the prior art, the present invention, owing to having added the permeate agent that can fully react with the lattice alkali in fine aluminum hydroxide powder, therefore can significantly reduce the content of lattice alkali in fine aluminum hydroxide powder, thereby reaches the object of removing lattice alkali in fine aluminum hydroxide powder; And dispersion agent can increase mobility and the dispersiveness of fine aluminum hydroxide powder, make fine aluminum hydroxide powder non-agglomerate or few agglomerate in washing process, thereby in washing process, more easily the alkali in the fine aluminum hydroxide powder attached alkali in surface and attached liquid is removed, reduced water consumption, improved except sodium effect.Facts have proved the fine aluminum hydroxide powder that adopts the inventive method to prepare, its sodium oxide content < 0.1%, bath water amount < 3m
3.
embodiment:below in conjunction with specific embodiment, the invention will be further described:
Embodiment 1
1) the fine aluminum hydroxide powder slurries that decomposing sodium aluminate solution reaction obtained filter, and obtain filtrate;
2) above-mentioned filtrate is added the hot waterization of 70 ℃ loose, obtain mixed solution, described using amount of hot water is to fall apart filtrateization to be advisable;
3) get mixed solution 1000Kg and mix with permeate agent 5Kg, fully stir, react and add again dispersion agent 0.5Kg after 3 hours, fully stir, react after 1 hour and filter, wash, obtain the fine aluminum hydroxide powder of sodium oxide content < 0.1%; The temperature of two secondary responses is 70 ℃.
Embodiment 2
1) the fine aluminum hydroxide powder slurries that decomposing sodium aluminate solution reaction obtained filter, and obtain filtrate;
2) above-mentioned filtrate is added and in the hot water of 90 ℃, change loosely, obtain mixed solution, described using amount of hot water is to be advisable filtrateization is loose;
3) get mixed solution 1000Kg and mix with permeate agent 10Kg, fully stir, react and add again dispersion agent 5Kg after 3 hours, fully stir, react after 1 hour and filter, wash, obtain the fine aluminum hydroxide powder of sodium oxide content < 0.1%; The temperature of two secondary responses is 90 ℃.
In the various embodiments described above, described permeate agent is a kind of in tetra-sodium, oxalic acid, Phenylsulfonic acid, formic acid, dioctyl phthalate, tannic acid, citric acid, tartrate, a kind of in described dispersion agent nitric acid, hydrochloric acid, sulfuric acid, phosphoric acid, hypochlorous acid, perchloric acid, acetic acid.
Claims (1)
1. fine aluminum hydroxide powder, except a sodium purifying method, is characterized in that step is as follows:
1) the fine aluminum hydroxide powder slurries that decomposing sodium aluminate solution reaction obtained filter, and obtain filtrate;
2) above-mentioned filtrate is added and in the hot water of 70～90 ℃, change loosely, obtain mixed solution;
3) to the permeate agent that adds 0.005～0.01 times of weight in mixed solution, fully stir, react after 3 hours and add again the dispersion agent of 0.0005～0.005 times of weight, fully stir, react filtration after 1 hour, wash; The temperature of two secondary responses is 70～90 ℃, described permeate agent is a kind of in tetra-sodium, oxalic acid, Phenylsulfonic acid, formic acid, dioctyl phthalate, tannic acid, citric acid, tartrate, a kind of in described dispersion agent nitric acid, hydrochloric acid, sulfuric acid, phosphoric acid, hypochlorous acid, perchloric acid, acetic acid.
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| CN201210466921.8A CN102992368B (en) | 2012-11-19 | 2012-11-19 | Purification method for removing sodium in aluminum hydroxide micropowder |
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| CN201210466921.8A CN102992368B (en) | 2012-11-19 | 2012-11-19 | Purification method for removing sodium in aluminum hydroxide micropowder |
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| CN102992368A CN102992368A (en) | 2013-03-27 |
| CN102992368B true CN102992368B (en) | 2014-12-10 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103214013B (en) * | 2013-04-27 | 2015-08-05 | 昆明冶金研究院 | A kind of preparation method of high purity alumina powder |
| CN103204530B (en) * | 2013-05-14 | 2014-10-22 | 昆明冶金研究院 | Method for removing sodium in preparation of high-purity alumina |
| CN103496728A (en) * | 2013-09-25 | 2014-01-08 | 贵州大学 | Method for reducing content of potassium in alumina |
| CN109437269B (en) * | 2018-12-10 | 2021-02-19 | 贵州博汇联润铝业有限公司 | Method for improving comprehensive performance of superfine ultra-white aluminum hydroxide micro powder |
| CN109368675B (en) * | 2018-12-10 | 2021-02-19 | 贵州博汇联润铝业有限公司 | Sodium removal and purification method for superfine ultra-white aluminum hydroxide micro powder |
| CN109502615B (en) * | 2018-12-10 | 2021-06-04 | 贵州博汇联润铝业有限公司 | Method for enhancing heat resistance of superfine and ultra-white aluminum hydroxide micro powder |
| CN109437268B (en) * | 2018-12-10 | 2021-02-19 | 贵州博汇联润铝业有限公司 | Method for improving activity of superfine and ultra-white aluminum hydroxide micro powder |
| CN109399677B (en) * | 2018-12-10 | 2021-04-13 | 贵州博汇联润铝业有限公司 | Method for preparing aluminum hydroxide by using aluminum rock as raw material cell grinding and water milling seed crystal |
| CN115818685A (en) * | 2021-09-15 | 2023-03-21 | 姜进涛 | Preparation method of spherical easily-dispersible alumina for diaphragm |
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| US3389975A (en) * | 1967-03-10 | 1968-06-25 | Sinclair Research Inc | Process for the recovery of aluminum values from retorted shale and conversion of sodium aluminate to sodium aluminum carbonate hydroxide |
| CN1286725C (en) * | 2004-05-14 | 2006-11-29 | 山东铝业股份有限公司 | Method for preparing high-pruity alumina powder |
| CN101182025B (en) * | 2007-11-28 | 2010-08-25 | 蹬口县欧凯红柱石矿业有限公司 | Method for preparing chemical aluminum oxide by using andalusite as raw material |
| CN102020302A (en) * | 2010-12-15 | 2011-04-20 | 中国铝业股份有限公司 | Method for reducing content of sodium in aluminum hydroxide |
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