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Method for producing hydrofluoric acid and waterless magnesium sulfate

An anhydrous magnesium sulfate, hydrofluoric acid technology, applied in magnesium sulfate, fluorine/hydrogen fluoride, silicon oxide and other directions, can solve the problems of high cost, complicated preparation process, etc., achieve good economic value and social value, and the process is simple and economical cost effect

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 preparation method is to react sulfuric acid and bitter earth powder (magnesite) to obtain magnesium sulfate monohydrate, and then undergo two stages of calcination to obtain anhydrous magnesium sulfate. The preparation process is more complicated and the cost is higher.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The method for producing hydrofluoric acid and anhydrous magnesium sulfate of the present invention, take fluosilicic acid, magnesium oxide as raw material, specifically comprise the following steps:

[0027] (1) reacting a fluorosilicate solution with a concentration of 15% and a magnesium oxide solid for 30 minutes, filtering to obtain a magnesium fluorosilicate solution, concentrating and crystallizing to obtain magnesium fluorosilicate hexahydrate;

[0028] (2) Decompose magnesium fluorosilicate hexahydrate at 200°C for 4 hours to generate magnesium fluoride solid, silicon tetrafluoride gas and water vapor;

[0029] (3) Absorb and hydrolyze silicon tetrafluoride gas and water vapor with water, filter to obtain 15% fluorosilicic acid solution, return to make magnesium fluorosilicate, wash and dry the silicon dioxide solid to obtain white carbon black;

[0030] (4) react the magnesium fluoride solid that step (2) generates and 98% sulfuric acid at a temperature of 150...

Embodiment 2

[0032] The method for producing hydrofluoric acid and anhydrous magnesium sulfate of the present invention, take fluosilicic acid, magnesium oxide as raw material, specifically comprise the following steps:

[0033] (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;

[0034] (2) Decompose magnesium fluorosilicate hexahydrate at 300°C for 3 hours to generate magnesium fluoride solid, silicon tetrafluoride gas and water vapor;

[0035] (3) absorb silicon tetrafluoride gas and water vapor with water and hydrolyze, filter to obtain 25% fluorosilicic acid solution, return to make magnesium fluorosilicate, wash and dry the silicon dioxide solid to obtain white carbon black;

[0036] (4) react the magnesium fluoride solid that step (2) generates with 99% sulfuric acid at a temperature of 250° C. for 3 hours, and the gas genera...

Embodiment 3

[0038] The method for producing hydrofluoric acid and anhydrous magnesium sulfate of the present invention, take fluosilicic acid, magnesium oxide as raw material, specifically comprise the following steps:

[0039] (1) react 35% fluosilicic acid solution and 20% magnesium oxide slurry for 30 minutes, filter to obtain magnesium fluosilicate solution, concentrate and crystallize to obtain magnesium fluosilicate hexahydrate;

[0040] (2) Decompose magnesium fluorosilicate hexahydrate at 400°C for 2 hours to generate solid magnesium fluoride and silicon tetrafluoride gas and water vapor;

[0041] (3) Absorb silicon tetrafluoride gas and water vapor with water and hydrolyze, filter to obtain 35% fluorosilicic acid solution, return to make magnesium fluorosilicate, wash and dry the silicon dioxide solid to obtain white carbon black;

[0042] (4) reacting the magnesium fluoride solid generated in step (2) with 100% sulfuric acid at a temperature of 300°C for 2 hours, the gas generat...

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PUM

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Abstract

The process of producing hydrofluoric acid and anhydrous magnesium sulfate with fluorosilicic acid and magnesia as material includes the following steps: 1. reacting fluorosilicic acid solution and magnesia for 10-60 min, filtering to obtain magnesium fluosilicate solution, and concentrating to obtain crystal magnesium fluosilicate hexahydrate; 2. decomposing magnesium fluorosilicate hexahydrate at 100-500 deg.c for 1-5 hr to produce solid magnesium fluoride, gaseous silicon tetrafluoride and water vapor; 3. absorbing gaseous silicon tetrafluoride and water vapor with water and hydrolyzing, and filtering to obtain fluorosilicic acid solution returned to the step 1 and silica, washing and drying to obtain carbon white; and 4. reacting the solid magnesium fluoride and 98 % over sulfuric acid, condensing the produced gas condensing and rectifying to obtain hydrofluoric acid, and obtaining anhydrous magnesium sulfate product.

Description

technical field [0001] The invention relates to a method for producing hydrofluoric acid and anhydrous magnesium sulfate, in particular to a method for producing hydrofluoric acid and anhydrous magnesium sulfate by using fluosilicic acid and magnesium oxide as raw materials. Background technique [0002] Hydrofluoric acid is used in the production of 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 , aluminum fluoride, uranium hexanitride, cryolite, etc.; it can also be used as a catalyst in etching glass, electroplating, reagents, fermentation, pottery treatment and petroleum industry; it can also be used in the manufacture of frosted bulbs, metal castings in addition to Sand, removal of graphite ash, cleaning of metals (pickling copper, brass, stainless steel, etc.) raw ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/19C01F5/40C01B33/113
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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