Method for producing aluminun fluoride

A production method, aluminum fluoride technology, applied in the direction of aluminum fluoride, aluminum halide, etc., can solve the problems of high raw material prices and high production costs in the production process

Inactive Publication Date: 2008-03-05
DO FLUORIDE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The raw material price of the above-mentioned production process is high, the productio

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The production method of aluminum fluoride of the present invention, take fluosilicic acid, aluminum hydroxide as raw material, comprise the following steps:

[0023] (1) reacting the 15% fluosilicic acid solution and the sodium sulfate solid for 30 minutes, filtering to obtain the sodium fluosilicate solid after the reaction, and treating and discharging the sulfuric acid waste liquid;

[0024] (2) Decompose sodium fluorosilicate at 350°C for 4 hours to generate sodium fluoride solid and silicon tetrafluoride gas;

[0025] (3) Absorb and hydrolyze silicon tetrafluoride gas with water, filter to obtain 15% fluorosilicic acid solution, return to make sodium fluorosilicate, wash and dry the silicon dioxide solid to obtain white carbon black;

[0026] (4) The sodium fluoride solid generated in step (2) reacted with 98% sulfuric acid at a temperature of 150°C for 5 hours, and the gas produced was condensed and rectified to obtain anhydrous hydrofluoric acid, and the solid s...

Embodiment 2

[0029] The production method of aluminum fluoride of the present invention, take fluosilicic acid, aluminum hydroxide as raw material, comprise the following steps:

[0030] (1) Reacting a 25% fluosilicic acid solution and sodium sulfate solid for 30 minutes, filtering to obtain the sodium fluosilicate solid, and treating and discharging the sulfuric acid waste liquid;

[0031] (2) Decompose sodium fluorosilicate at 450°C for 4 hours to generate sodium fluoride solid and silicon tetrafluoride gas;

[0032] (3) Absorb and hydrolyze silicon tetrafluoride gas with water, filter to obtain 25% fluorosilicic acid solution, return to make sodium fluorosilicate, wash and dry the silicon dioxide solid to obtain white carbon black;

[0033] (4) The sodium fluoride solid prepared in step (2) reacted with 99% sulfuric acid at a temperature of 250°C for 3 hours, and the gas produced was condensed and rectified to obtain anhydrous hydrofluoric acid, and the solid sodium sulfate was returned...

Embodiment 3

[0036] The production method of aluminum fluoride of the present invention, take fluosilicic acid, aluminum hydroxide as raw material, comprise the following steps:

[0037] (1) Reacting a 35% fluosilicic acid solution and sodium sulfate solid for 30 minutes, filtering to obtain the sodium fluosilicate solid, and treating and discharging the sulfuric acid waste liquid;

[0038] (2) Decompose sodium fluorosilicate at 750°C for 2 hours to generate sodium fluoride solid and silicon tetrafluoride gas;

[0039] (3) Absorb silicon tetrafluoride gas with water and hydrolyze it, filter to obtain 45% fluorosilicic acid solution, return to make sodium fluorosilicate, wash and dry the silicon dioxide solid to obtain white carbon black;

[0040] (4) The sodium fluoride solid prepared in step (2) reacted with 100% sulfuric acid at a temperature of 300°C for 2 hours, and the gas produced was condensed and rectified to obtain anhydrous hydrofluoric acid, and the solid sodium sulfate was retu...

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PUM

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Abstract

The present invention relates to process of producing aluminum fluoride with fluorosilicic acid and aluminum hydroxide as material. The process includes the following steps: 1. reacting fluorosilicic acid solution and sodium sulfate for 10-60 min, filtering to obtain solid sodium fluorosilicate and waste sulfuric acid solution to be treated and drained; 2. decomposing aluminum fluorosilicate at 300-800 deg.c for 1-5 hr to produce solid sodium fluoride and silicon tetrafluoride gas; 3. absorbing silicon tetrafluoride gas with water and hydrolyzing, filtering to obtain fluorosilicic acid solution to be returned to the step 1 and solid silica, and washing and drying silica to obtain carbon white; 4. reacting solid sodium fluoride and sulfuric acid, condensing, rectifying to obtain anhydrous hydrofluoric acid and solid sodium sulfate returned to the step 1; and 5. reacting anhydrous hydrofluoric acid and aluminum hydroxide to produce aluminum fluoride product. The process is environment friendly.

Description

technical field [0001] The invention relates to a method for producing aluminum fluoride, in particular to a method for producing aluminum fluoride by using fluorosilicic acid and aluminum hydroxide as raw materials. 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 trifluoride is generated at the bottom of the reactor, and the aluminum trifluoride is sent to the drum to cool to obtain the finished p...

Claims

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Application Information

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IPC IPC(8): C01F7/50
Inventor 李世江侯红军杨华春皇甫根利闫春生张金保张良
Owner DO FLUORIDE CHEM CO LTD
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