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Method for preparing aluminun fluoride, waterless magnesium sulfate and sodium fluoride

A technology of anhydrous magnesium sulfate and sodium fluoride, which is applied in the field of anhydrous magnesium sulfate and sodium fluoride to prepare aluminum fluoride, can solve the problems of high production cost, achieve low production cost, easy operation, and realize the effect of recycling

Active Publication Date: 2008-03-05
BAIYIN ZHONGTIAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional production process of sodium fluoride uses sodium fluorosilicate and soda ash as raw materials, reacts sodium fluorosilicate and soda ash in the water phase to form a mixture slurry of sodium fluoride and silicon dioxide, and separates the two according to gravity sedimentation , to obtain sodium fluoride products, the production cost is relatively high with soda ash as raw material

Method used

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Embodiment 1

[0031] The method for preparing aluminum fluoride, anhydrous magnesium sulfate, and sodium fluoride of the present invention uses sodium fluorosilicate, magnesium oxide, and aluminum hydroxide as raw materials, comprising the following steps:

[0032] (1) Decompose sodium fluorosilicate at a temperature of 350° C. for 4 hours to generate sodium fluoride solid product and silicon tetrafluoride gas;

[0033] (2) Silicon tetrafluoride gas is absorbed and hydrolyzed with water, and the obtained 15% fluorosilicate solution is filtered to prepare magnesium fluorosilicate, and the silica solid is washed and dried to obtain white carbon black;

[0034] (3) react 15% fluosilicic acid solution with magnesium oxide solid for 30 minutes, filter to obtain magnesium fluosilicate solution, concentrate and crystallize to obtain magnesium fluosilicate hexahydrate;

[0035] (4) Magnesium fluorosilicate hexahydrate was decomposed at 200°C for 4 hours to generate solid magnesium fluoride and sili...

Embodiment 2

[0040] The method for preparing aluminum fluoride, anhydrous magnesium sulfate, and sodium fluoride of the present invention uses sodium fluorosilicate, magnesium oxide, and aluminum hydroxide as raw materials, comprising the following steps:

[0041] (1) Decomposing sodium fluorosilicate at a temperature of 450° C. for 3 hours to generate sodium fluoride solid product and silicon tetrafluoride gas;

[0042] (2) Silicon tetrafluoride gas is absorbed and hydrolyzed with water, filtered and the obtained 25% fluorosilicate solution is used to prepare magnesium fluorosilicate, and the silica solid is washed and dried to obtain white carbon black;

[0043] (3) react 25% fluosilicic acid solution with 30% magnesium oxide slurry for 30 minutes, filter to obtain magnesium fluosilicate solution, concentrate and crystallize to obtain magnesium fluosilicate hexahydrate;

[0044] (4) Decompose magnesium fluorosilicate hexahydrate at 300°C for 3 hours to generate solid magnesium fluoride a...

Embodiment 3

[0049] The method for preparing aluminum fluoride, anhydrous magnesium sulfate, and sodium fluoride of the present invention uses sodium fluorosilicate, magnesium oxide, and aluminum hydroxide as raw materials, comprising the following steps:

[0050] (1) Decompose sodium fluorosilicate at a temperature of 750° C. for 2 hours to generate sodium fluoride solid product and silicon tetrafluoride gas;

[0051](2) Silicon tetrafluoride gas is absorbed and hydrolyzed with water, and the obtained 35% fluosilicic acid solution is filtered to prepare magnesium fluosilicate, and the silica solid is washed and dried to obtain white carbon black;

[0052] (3) react 35% fluorosilicic acid solution with 20% magnesium oxide slurry for 30 minutes, filter to obtain magnesium fluorosilicate solution, concentrate and crystallize to obtain magnesium fluorosilicate hexahydrate;

[0053] (4) Magnesium fluorosilicate hexahydrate was decomposed at 400°C for 2 hours to generate solid magnesium fluorid...

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Abstract

The process of preparing aluminum fluoride, anhydrous magnesium sulfate and sodium fluoride includes the following steps: 1. decomposing sodium fluorosilicate to produce sodium fluoride solid and silicon tetrafluoride gas; 2. absorbing silicon tetrafluoride gas with water and hydrolyzing, and washing and drying silica to obtain carbon white; 3. reacting fluorosilicic acid solution and magnesia, filtering and concentrating to obtain crystal magnesium fluorosilicate hexahydrate; 4. decomposing magnesium fluorosilicate hexahydrate to produce magnesium fluoride solid, silicon tetrafluoride gas and water vapor; 5. absorbing silicon tetrafluoride gas and water vapor with water and hydrolyzing, and washing and drying silica to obtain carbon white; 6. reacting magnesium fluoride and sulfuric acid to produce anhydrous magnesium sulfate, condensing and rectifying to obtain anhydrous hydrofluoric acid; and 7. reacting anhydrous hydrofluoric acid and aluminum hydroxide to produce aluminum fluoride.

Description

technical field [0001] The invention relates to a method for preparing aluminum fluoride, anhydrous magnesium sulfate, and sodium fluoride, in particular to a method for preparing aluminum fluoride, anhydrous magnesium sulfate, and fluoride by using sodium fluorosilicate, magnesium oxide, and aluminum hydroxide as raw materials. Sodium method. Background technique [0002] Aluminum fluoride is used as an additive in the production of electrolytic aluminum to lower the melting point of the electrolyte and increase the conductivity of the electrolyte. Its traditional production process is hydrofluoric acid-dry process and hydrofluoric acid-wet process. Hydrofluoric acid - the raw materials of the dry process are hydrogen fluoride and aluminum hydroxide, and its production process includes pretreatment of aluminum hydroxide to remove crystal water, and then powdered aluminum hydroxide and hydrogen fluoride gas The reaction is fully mixed under the reactor, and aluminum triflu...

Claims

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Application Information

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IPC IPC(8): C01F7/50C01F5/40C01D3/02C01B33/113
Inventor 李世江侯红军杨华春皇甫根利闫春生刘海霞范晓磊
Owner BAIYIN ZHONGTIAN CHEM
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