Method for producing hydrofluoric acid, waterless magnesium sulfate and sodium fluoride

A technology of anhydrous magnesium sulfate and sodium fluoride, which is applied in the field of production of hydrofluoric acid, anhydrous magnesium sulfate and sodium fluoride, can solve the problems of high cost, achieve low production cost, simple process, and realize the effect of recycling

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 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 generate a

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The method for producing hydrofluoric acid, anhydrous magnesium sulfate, sodium fluoride of the present invention, is raw material with sodium fluorosilicate, magnesium oxide, comprises the following steps:

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

[0033] (2) absorb and hydrolyze silicon tetrafluoride gas with water, filter and obtain 15% fluorosilicic acid solution to prepare magnesium fluorosilicate, wash and dry the silicon dioxide solid to obtain white carbon black;

[0034] (3) reacting the fluorosilicate solution with magnesium oxide for 30 minutes, filtering to obtain the magnesium fluorosilicate solution, concentrating and crystallizing to obtain magnesium fluorosilicate hexahydrate;

[0035] (4) Magnesium fluorosilicate hexahydrate is decomposed at a temperature of 200° C. for 4 hours to generate magnesium fluoride solid and silicon tetrafluoride gas ...

Embodiment 2

[0039] The method for producing hydrofluoric acid, anhydrous magnesium sulfate, sodium fluoride of the present invention, is raw material with sodium fluorosilicate, magnesium oxide, comprises the following steps:

[0040] (1) Decompose sodium fluorosilicate at a temperature of 450° C. for 3 hours to generate sodium fluoride product and silicon tetrafluoride gas;

[0041] (2) absorb and hydrolyze silicon tetrafluoride gas with water, filter and obtain 25% fluorosilicic acid solution to prepare magnesium fluorosilicate, wash the silicon dioxide solid, and dry to obtain white carbon black;

[0042] (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;

[0043] (4) Magnesium fluorosilicate hexahydrate is decomposed at a temperature of 300° C. for 3 hours to generate magnesium fluoride solid and silicon tetrafluoride gas and ...

Embodiment 3

[0047] The method for producing hydrofluoric acid, anhydrous magnesium sulfate, sodium fluoride of the present invention, is raw material with sodium fluorosilicate, magnesium oxide, comprises the following steps:

[0048] (1) Decompose sodium fluorosilicate at a temperature of 750°C for 2 hours to generate sodium fluoride product and silicon tetrafluoride gas;

[0049] (2) absorb and hydrolyze silicon tetrafluoride gas with water, filter and obtain 35% fluorosilicic acid solution to prepare magnesium fluorosilicate, wash and dry the silicon dioxide solid to obtain white carbon black;

[0050] (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;

[0051] (4) Magnesium fluorosilicate hexahydrate is decomposed at a temperature of 400° C. for 2 hours to generate magnesium fluoride solid and silicon tetrafluoride gas a...

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PUM

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Abstract

The process of producing hydrofluoric acid, anhydrous magnesium sulfate and sodium fluoride with sodium fluorosilicate and magnesia as material includes the following steps: 1. decomposing sodium fluorosilicate to produce sodium fluoride product and silicon tetrafluoride gas; 2. absorbing the gas with water, filtering to prepare fluorosilicic acid solution for preparing magnesium tetrafluoride, washing silica and drying to obtain carbon white; 3. reacting fluorosilicic acid solution and magnesia, filtering to obtain magnesium fluorosilicate solution, 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 the gas with water and hydrolyzing, filtering to obtain fluorosilicic acid solution returned to the step 3, washing silica and drying to obtain carbon white; and 6. reacting magnesium fluoride and sulfuric acid, condensing and rectifying to obtain hydrofluoric acid, and obtaining anhydrous magnesium sulfate.

Description

technical field [0001] The invention relates to a method for producing hydrofluoric acid, anhydrous magnesium sulfate and sodium fluoride, in particular to a method for producing hydrofluoric acid, anhydrous magnesium sulfate and sodium fluoride using sodium fluorosilicate and magnesium oxide as raw materials . Background technique [0002] Hydrofluoric acid can be used to produce fluorine refrigerants, fluorine-containing resins, organic synthesis (polymerization, condensation, alkylation) promoted fusion fluorine resins, flame retardants, dye synthesis, and the manufacture of organic or inorganic fluorides, such as fluorocarbons Compounds, aluminum fluoride, uranium hexanitride, cryolite, etc.; can also be used for etching glass, electroplating, reagents, fermentation, pottery treatment, catalysts in the petroleum industry, and the manufacture of frosted bulbs, and desanding of metal castings , the removal of graphite ash, the cleaning of metals (pickling copper, brass, s...

Claims

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Application Information

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IPC IPC(8): C01B7/19C01F5/40C01D3/02
Inventor 李世江侯红军杨华春皇甫根利闫春生张梅贾雪枫
Owner DO FLUORIDE CHEM CO LTD
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