CN102992368A - 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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- CN102992368A CN102992368A CN2012104669218A CN201210466921A CN102992368A CN 102992368 A CN102992368 A CN 102992368A CN 2012104669218 A CN2012104669218 A CN 2012104669218A CN 201210466921 A CN201210466921 A CN 201210466921A CN 102992368 A CN102992368 A CN 102992368A
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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 the 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, through filter separate, hot water secondary backflush and getting.The height of sodium content has determined the quality of aluminium hydroxide product.In seed precipitation process, contain some crystalline alkali in the aluminum hydroxide crystals, some adheres to alkali its surface.Can make by washing methods and to adhere to alkali and significantly reduce, but the crystalline alkali in the aluminum hydroxide crystals then is difficult to remove, and becomes one of major impurity that affects product quality.
Ordinary hydrogen alumina product granularity is large, and the attached water amount is about 15%, and it is easy that alkali is adhered in cleaning; And fine aluminum hydroxide powder attached water amount is about 30-40%, cleans and adheres to then difficulty relatively of alkali, and 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 the bath water amount is generally 6～10m
3
Summary of the invention:For the defects that exists in the prior art, the present invention aim to provide a kind of except sodium is effective, efficient is high, the bath water amount is few fine aluminum hydroxide powder except the sodium purifying method.
In order to realize the foregoing invention purpose, the present invention by the following technical solutions:
1) the fine aluminum hydroxide powder dope filtration that the decomposing sodium aluminate solution reaction is obtained gets filtrate;
2) change in the hot water of 70～90 ℃ of above-mentioned filtrate addings is loose, get mixed solution;
3) add the permeate agent of 0.005～0.01 times of weight in the mixed solution, fully stir, react the dispersion agent that adds again 0.0005～0.005 times of weight after 3 hours, 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, the tartrate, a kind of in described dispersion agent nitric acid, hydrochloric acid, sulfuric acid, phosphoric acid, hypochlorous acid, perchloric acid, the acetic acid.
Compared with the prior art, the present invention since added can with fine aluminum hydroxide powder in the permeate agent that fully reacts of lattice alkali, therefore can significantly reduce the content of lattice alkali in the fine aluminum hydroxide powder, thereby reach the purpose of removing lattice alkali in the fine aluminum hydroxide powder; And dispersion agent can increase the mobile and dispersed of fine aluminum hydroxide powder, make fine aluminum hydroxide powder non-agglomerate or few agglomerate in washing process, thereby easier in washing process the alkali in the attached alkali in fine aluminum hydroxide powder surface and the attached liquid is removed, reduced water consumption, improved except the sodium effect.Facts have proved, adopt the fine aluminum hydroxide powder of the inventive method preparation, its sodium oxide content＜0.1%, bath water amount＜3m
3
Embodiment:The invention will be further described below in conjunction with specific embodiment:
Embodiment 1
1) the fine aluminum hydroxide powder dope filtration that the decomposing sodium aluminate solution reaction is obtained gets filtrate;
2) hot waterization that above-mentioned filtrate is added 70 ℃ is fallen apart, and gets mixed solution, and described using amount of hot water is advisable so that filtrateization is fallen apart;
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 filtration after 1 hour, wash, namely get 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 dope filtration that the decomposing sodium aluminate solution reaction is obtained gets filtrate;
2) change in the hot water of 90 ℃ of above-mentioned filtrate addings is loose, get mixed solution, described using amount of hot water is advisable so that filtrateization is fallen apart;
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 filtration after 1 hour, wash, namely get 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, the tartrate, a kind of in described dispersion agent nitric acid, hydrochloric acid, sulfuric acid, phosphoric acid, hypochlorous acid, perchloric acid, the acetic acid.
Claims (1)
1. a fine aluminum hydroxide powder is characterized in that except the sodium purifying method step is as follows:
1) the fine aluminum hydroxide powder dope filtration that the decomposing sodium aluminate solution reaction is obtained gets filtrate;
2) change in the hot water of 70～90 ℃ of above-mentioned filtrate addings is loose, get mixed solution;
3) add the permeate agent of 0.005～0.01 times of weight in the mixed solution, fully stir, react the dispersion agent that adds again 0.0005～0.005 times of weight after 3 hours, 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, the tartrate, a kind of in described dispersion agent nitric acid, hydrochloric acid, sulfuric acid, phosphoric acid, hypochlorous acid, perchloric acid, the acetic acid.
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| CN102992368A true CN102992368A (en) | 2013-03-27 |
| CN102992368B CN102992368B (en) | 2014-12-10 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103204530A (en) * | 2013-05-14 | 2013-07-17 | 昆明冶金研究院 | Method for removing sodium in preparation of high-purity alumina |
| CN103214013A (en) * | 2013-04-27 | 2013-07-24 | 昆明冶金研究院 | Preparation method of high-purity alumina powder |
| CN103496728A (en) * | 2013-09-25 | 2014-01-08 | 贵州大学 | Method for reducing content of potassium in alumina |
| CN109368675A (en) * | 2018-12-10 | 2019-02-22 | 贵州博汇联润铝业有限公司 | A kind of ultra-fine ultrawhite aluminum hydroxide micro mist removes sodium purification method |
| CN109399677A (en) * | 2018-12-10 | 2019-03-01 | 贵州博汇联润铝业有限公司 | One kind grinding water mill crystal seed as raw cell using pelite and prepares aluminium hydroxide method |
| CN109437268A (en) * | 2018-12-10 | 2019-03-08 | 贵州博汇联润铝业有限公司 | A kind of ultra-fine ultrawhite aluminum hydroxide micro mist activity ameliorative way |
| CN109437269A (en) * | 2018-12-10 | 2019-03-08 | 贵州博汇联润铝业有限公司 | It is a kind of to improve ultra-fine ultrawhite aluminum hydroxide micro mist comprehensive performance method |
| CN109502615A (en) * | 2018-12-10 | 2019-03-22 | 贵州博汇联润铝业有限公司 | A kind of ultra-fine heat-resisting method of ultrawhite aluminum hydroxide micro mist of enhancing |
| CN115818685A (en) * | 2021-09-15 | 2023-03-21 | 姜进涛 | Preparation method of spherical easily-dispersible alumina for diaphragm |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103214013A (en) * | 2013-04-27 | 2013-07-24 | 昆明冶金研究院 | Preparation method of high-purity alumina powder |
| 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 |
| CN103204530A (en) * | 2013-05-14 | 2013-07-17 | 昆明冶金研究院 | Method for removing sodium in preparation of high-purity alumina |
| 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 |
| CN109399677A (en) * | 2018-12-10 | 2019-03-01 | 贵州博汇联润铝业有限公司 | One kind grinding water mill crystal seed as raw cell using pelite and prepares aluminium hydroxide method |
| CN109368675A (en) * | 2018-12-10 | 2019-02-22 | 贵州博汇联润铝业有限公司 | A kind of ultra-fine ultrawhite aluminum hydroxide micro mist removes sodium purification method |
| CN109437268A (en) * | 2018-12-10 | 2019-03-08 | 贵州博汇联润铝业有限公司 | A kind of ultra-fine ultrawhite aluminum hydroxide micro mist activity ameliorative way |
| CN109437269A (en) * | 2018-12-10 | 2019-03-08 | 贵州博汇联润铝业有限公司 | It is a kind of to improve ultra-fine ultrawhite aluminum hydroxide micro mist comprehensive performance method |
| CN109502615A (en) * | 2018-12-10 | 2019-03-22 | 贵州博汇联润铝业有限公司 | A kind of ultra-fine heat-resisting method of ultrawhite aluminum hydroxide micro mist of enhancing |
| 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 |
| 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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