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Preparation method of sodium hexafluoroaluminate

A technology for sodium hexafluoroaluminate and aluminum ash, which is applied in the field of preparation of sodium hexafluoroaluminate, can solve the problems of high energy consumption, waste of available resources, environmental hazards, etc. , Easy to operate, low energy consumption

Active Publication Date: 2020-06-30
郑州轻大产业技术研究院有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dry method of recycling aluminum consumes a lot of energy, requires a lot of investment, and will cause secondary pollution.
After recycling the aluminum, there is still secondary aluminum ash that has not been processed. The secondary aluminum ash still contains toxic substances such as fluorine and heavy metals, which will still cause harm to the environment.
In addition, the secondary aluminum ash contains a lot of alumina, if it is directly landfilled after harmless treatment, it is also a waste of available resources

Method used

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  • Preparation method of sodium hexafluoroaluminate
  • Preparation method of sodium hexafluoroaluminate
  • Preparation method of sodium hexafluoroaluminate

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preparation example Construction

[0028] The invention provides a sodium hexafluoroaluminate (cryolite, Na 3 AlF 6 ) preparation method, comprising the following steps:

[0029] The denitrified aluminum ash is mixed with sodium hydroxide to carry out alkali leaching reaction, and then separated to obtain a supernatant solution;

[0030] The supernatant solution was crystallized to obtain sodium hexafluoroaluminate.

[0031] In the present invention, unless otherwise specified, the raw materials used are conventional commercially available products in this field.

[0032] In the invention, the denitrified aluminum ash is mixed with sodium hydroxide to carry out alkaline leaching reaction, and then separated to obtain a supernatant solution.

[0033] In the present invention, denitrification is preferably performed after the aluminum ash is crushed to obtain a denitrified solution, and the denitrified solution includes the denitrified aluminum ash. In the embodiment of the present invention, the denitrified ...

Embodiment 1

[0045] Effect of different crystallization pH values ​​on the preparation of sodium hexafluoroaluminate

[0046] Grind 10g of aluminum ash into a powder with a particle size of 300 mesh, add 100mL of sodium hydroxide solution with a mass concentration of 10%, and denitrify at a temperature of 100-110°C and a stirring speed of 150r / min, then recover Add 6g of sodium hydroxide to the ammonia gas obtained by denitrification, and carry out alkali leaching reaction at a temperature of 75°C and a stirring speed of 150r / min. After the alkali leaching reaction, centrifuge to obtain a supernatant solution and filter residue. After adding 3g of sodium fluoride to the supernatant solution, use NaOH with a molar concentration of 5mol / L to adjust the pH value of the supernatant solution to 6.07, 8.09, 10.06 and 13.18 respectively, and crystallize at 25°C. After filtering, Dry at 65°C to obtain sodium hexafluoroaluminate, which can be obtained through analysis, and the purity of the prepare...

Embodiment 2

[0052] Effect of Different Crystallization Temperatures on the Preparation of Sodium Hexafluoroaluminate

[0053] Grind 10g of aluminum ash into a powder with a particle size of 300 mesh, add 100mL of sodium hydroxide solution with a mass concentration of 10%, and denitrify at a temperature of 100-110°C and a stirring speed of 150r / min, then recover The ammonia gas obtained by denitrification is added with a sodium hydroxide solution with a mass concentration of 8%, and the alkali leaching reaction is carried out at a temperature of 75° C. and a stirring speed of 150 r / min. After the alkali leaching reaction, centrifugation is carried out to obtain the above After adding 3g sodium fluoride to the supernatant solution and the filter residue, use NaOH with a molar concentration of 5mol / L, adjust the pH value of the supernatant solution to 10, and set the temperature at 2°C, 25°C, 50°C and 75°C respectively. Crystallize under the condition of ℃, filter and dry at 65℃ to obtain so...

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Abstract

The invention provides a preparation method of sodium hexafluoroaluminate, and belongs to the technical field of preparation of sodium hexafluoroaluminate. The preparation method provided by the invention comprises the following steps: mixing denitrified aluminum ash with sodium hydroxide, carrying out alkaline leaching reaction, and separating to obtain a supernatant solution; and crystallizing the supernatant solution to obtain the sodium hexafluoroaluminate. According to the method, the denitrified aluminum ash is used as a raw material, and the F element in the aluminum ash is fixed whilethe Al element in the aluminum ash is finely taken through alkaline leaching reaction, so that aluminum and aluminum oxide in the aluminum ash can be utilized at the same time, and the aluminum ash can be harmlessly treated; and the sodium hexafluoroaluminate is prepared through crystallization, and the purity of the sodium hexafluoroaluminate is high.

Description

technical field [0001] The invention belongs to the technical field of sodium hexafluoroaluminate preparation, in particular to a preparation method of sodium hexafluoroaluminate. Background technique [0002] With the increase of electrolytic aluminum output, how to deal with aluminum ash is imminent. At present, the methods for processing aluminum ash mainly include physical methods and chemical methods. The physical method of processing aluminum ash mainly utilizes the aluminum in the recovered aluminum ash, and separates the molten aluminum from the aluminum ash under high temperature or high pressure conditions. The chemical treatment of aluminum ash is mainly to leach the aluminum element in the aluminum ash by alkali leaching or acid leaching, and then use the leaching solution to prepare aluminum-containing products. In addition, the heat-resistant components in aluminum ash can be used as fireproof materials, and after the harmless treatment of aluminum ash, it ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/54
CPCC01F7/54C01P2006/80
Inventor 张宏忠李聪王綮陈文亮王兰宋亚丽张赛张欢周航航钱旭辉
Owner 郑州轻大产业技术研究院有限公司
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