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Method of producing aluminium fluoride

A technology for producing aluminum fluoride and aluminum fluoride, which is applied in the direction of aluminum fluoride and aluminum halide, etc., can solve the problems of large investment in dry process equipment, complicated process, high production cost, etc., and achieve abundant reserves, easy mining and low cost Effect

Inactive Publication Date: 2007-11-14
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 production process is high, the production cost is relatively high, the dry process equipment investment is large, and the process is complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The method for producing aluminum fluoride in this embodiment is as follows: mother liquor (dilute sulfuric acid) and concentrated sulfuric acid are prepared into a sulfuric acid solution with a concentration of 200g / l, and react with kaolinite in a pressurized reactor at a reaction temperature of 135°C. The time is 1 hour; after the reaction is finished, filter to obtain an aluminum sulfate solution with an aluminum ion content of 42g / l; react the aluminum sulfate solution with hydrofluoric acid to crystallize, after the crystallization is completed, filter and wash to obtain aluminum fluoride trihydrate, and then dry Dehydration to produce aluminum fluoride products.

Embodiment 2

[0016] The method for producing aluminum fluoride of the present embodiment is as follows: mother liquor (dilute sulfuric acid) and concentrated sulfuric acid are mixed into the sulfuric acid solution that concentration is 250g / , react with kaolinite in pressurized reactor, reaction temperature 140 ℃, reaction time 1.5 hours; after the reaction, filter to obtain an aluminum sulfate solution with an aluminum ion content of 55g / l; react the aluminum sulfate solution with hydrofluoric acid to crystallize, and after the crystallization is completed, filter and wash to obtain aluminum fluoride trihydrate, and then dry and dehydrate , to produce aluminum fluoride products.

Embodiment 3

[0018] The method for producing aluminum fluoride in this embodiment is as follows: the mother liquor (dilute sulfuric acid) and concentrated sulfuric acid are prepared into a sulfuric acid solution with a concentration of 300g / l, and react with kaolinite in a pressurized reactor at a reaction temperature of 145°C. The time is 2 hours; after the reaction is completed, filter to obtain an aluminum sulfate solution with an aluminum ion content of 60g / l; react the aluminum sulfate solution with hydrofluoric acid to crystallize, and after the crystallization is completed, filter and wash to obtain aluminum fluoride trihydrate, and then dry Dehydration to produce aluminum fluoride products.

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PUM

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Abstract

A process for preparing aluminum fluoride from kaolinite and hydrofluoric acid includes such steps as pulverizing kaolinite, reaction between sulfuric acid solution and said kaolinite, filtering to obtain aluminum sulfate solution, reacting on dyrofluoric acid, crystallizing, filtering, washing and drying. It has low cost.

Description

technical field [0001] The present invention relates to a method for producing aluminum fluoride with kaolinite and hydrofluoric acid. 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 method and hydrofluoric acid-wet method. Hydrofluoric acid - the dry process uses hydrogen fluoride and aluminum hydroxide as raw materials. Its production method includes pretreatment of aluminum hydroxide to remove crystal water, and then powdered aluminum hydroxide and hydrogen fluoride gas at 500-600 ° C Under the temperature conditions, the reaction is fully mixed, and aluminum trifluoride is generated at the bottom of the reactor, and the aluminum trifluoride is sent to the drum for cooling to obtain the finished product. Hydrofluoric acid - the raw materials of the wet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/50
Inventor 李世江侯红军杨华春皇甫根利刘顺兴刘海霞张金保
Owner DO FLUORIDE CHEM CO LTD