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Method for preparing aluminun fluoride and waterless magnesium sulfate

A technology of anhydrous magnesium sulfate and aluminum fluoride, applied in the direction of aluminum fluoride, magnesium sulfate, aluminum halide, etc., can solve the problems of high raw material prices and high production costs in the production process, achieve good economic value and social value, and save costs , the effect of alleviating pollution

Inactive Publication Date: 2010-09-15
DO FLUORIDE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The raw material price of the above-mentioned production process is high, the production cost is high, and the country's precious strategic resource - fluorite mineral is used

Method used

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  • Method for preparing aluminun fluoride and waterless magnesium sulfate

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Embodiment 1

[0027] The present invention prepares the method for aluminum fluoride, anhydrous magnesium sulfate, comprises the following steps:

[0028] (1) Reacting a 15% fluosilicic acid solution with a magnesium oxide solid for 30 minutes, filtering to obtain a magnesium fluosilicate solution, concentrating and crystallizing to obtain magnesium fluosilicate hexahydrate;

[0029] (2) Decompose magnesium fluorosilicate hexahydrate at 200°C for 4 hours to generate magnesium fluoride solid, silicon tetrafluoride gas and water vapor;

[0030] (3) absorb and hydrolyze silicon tetrafluoride gas and water vapor with water, filter to obtain a concentration of 15% fluosilicic acid solution, return it to make magnesium fluosilicate, wash the silicon dioxide solid, and dry to obtain white carbon black;

[0031] (4) The magnesium fluoride solid generated in step (2) and the sulfuric acid with a concentration of 98% were reacted at a temperature of 150°C for 5 hours, and the generated gas was conden...

Embodiment 2

[0034] The present invention prepares the method for aluminum fluoride, anhydrous magnesium sulfate, comprises the following steps:

[0035] (1) React 25% fluosilicic acid solution and 30% magnesium oxide slurry for 30 minutes, filter to obtain magnesium fluosilicate solution, concentrate and crystallize to obtain magnesium fluosilicate hexahydrate;

[0036] (2) Decompose magnesium fluorosilicate hexahydrate at 300°C for 3 hours to generate magnesium fluoride solid, silicon tetrafluoride gas and water vapor;

[0037] (3) Absorb and hydrolyze silicon tetrafluoride gas and water vapor with water, filter to obtain 25% fluorosilicic acid solution, return to make magnesium fluorosilicate, wash the silicon dioxide solid, and dry to obtain white carbon black;

[0038] (4) React the magnesium fluoride solid generated in step (2) with 99% sulfuric acid at a temperature of 250°C for 3 hours, and the gas generated is condensed and rectified to obtain anhydrous hydrofluoric acid, and the ...

Embodiment 3

[0041] The present invention prepares the method for aluminum fluoride, anhydrous magnesium sulfate, comprises the following steps:

[0042] (1) React 35% fluosilicic acid solution with 20% magnesium oxide slurry for 30 minutes, filter to obtain magnesium fluosilicate solution, concentrate and crystallize to obtain magnesium fluosilicate hexahydrate;

[0043] (2) Decompose magnesium fluorosilicate hexahydrate at 400°C for 2 hours to generate solid magnesium fluoride and silicon tetrafluoride gas and water vapor;

[0044] (3) absorb and hydrolyze silicon tetrafluoride gas and water vapor with water, filter to obtain 35% fluorosilicic acid solution, return to prepare magnesium fluorosilicate, wash and dry the silicon dioxide solid to obtain white carbon black;

[0045] (4) The magnesium fluoride solid generated in step (2) and the sulfuric acid with a concentration of 100% were reacted at a temperature of 300°C for 2 hours, and the generated gas was condensed and rectified to ob...

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Abstract

The process of producing aluminum fluoride and anhydrous magnesium sulfate with fluorosilicic acid, magnesia and aluminum hydroxide as material includes the following steps: 1.reacting fluorosilicic acid solution and magnesia, filtering to obtain magnesium fluorosilicate solution, concentrating to obtain crystal magnesium fluorosilicate hexahydrate; 2. decomposing magnesium fluorosilicate hexahydrate at 100-500 deg.c to produce magnesium fluoride solid, silicon tetrafluoride gas and water vapor; 3. absorbing silicon tetrafluoride gas and water vapor with water and hydrolyzing, filtering to obtain fluorosilicic acid solution for reuse, and washing and drying silica to obtain carbon white; 4. reacting magnesium fluoride and sulfuric acid to produce anhydrous magnesium sulfate, condensing and rectifying to obtain anhydrous hydrofluoric acid; and 5. 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 and anhydrous magnesium sulfate, in particular to a method for preparing aluminum fluoride and anhydrous magnesium sulfate by using fluosilicic acid, magnesium oxide 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, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/50C01F5/40C01B33/113
Inventor 李世江侯红军杨华春皇甫根利闫春生贾雪枫范晓磊
Owner DO FLUORIDE CHEM CO LTD
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