Preparation method of hydrofluoric acid
A technology of hydrofluoric acid and fluorosilicic acid, applied in the directions of fluorine/hydrogen fluoride, silicon oxide, etc., can solve the problems of complex hydrofluoric acid process, non-renewable fluorite, and high raw material cost, and achieve easy popularization and application and good economic value. and social value, the effect of reducing production costs
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Embodiment 1
[0022] The preparation method of hydrofluoric acid of the present invention, take fluosilicic acid as raw material, comprises the following steps:
[0023] (1) reacting a fluorosilicic acid solution with a concentration of 15% and a solid sodium sulfate for 30 minutes, filtering to obtain a sodium fluorosilicate solid, 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) React the sodium fluoride solid generated in step (2) with 98% sulfuric acid at a temperature of 150°C for 5 hours, the gas produced is condensed and rectified to obtain hydrofluoric acid, and the solid sodium sulfate is returned to pro...
Embodiment 2
[0028] The preparation method of hydrofluoric acid of the present invention, take fluosilicic acid as raw material, comprises the following steps:
[0029] (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;
[0030] (2) Decomposing sodium fluorosilicate at a temperature of 450° C. for 4 hours to generate sodium fluoride solid and silicon tetrafluoride gas;
[0031] (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;
[0032] (4) React the sodium fluoride solid generated in step (2) with 99% sulfuric acid at a temperature of 250°C for 3 hours, the gas produced is condensed and rectified to obtain hydrofluoric acid, and the solid sodium sulfate is returned to produce fl...
Embodiment 3
[0034] The preparation method of hydrofluoric acid of the present invention, take fluosilicic acid as raw material, comprises the following steps:
[0035] (1) react 35% fluorosilicic acid solution and sodium sulfate solid for 30 minutes, filter to obtain sodium fluorosilicate solid, and discharge the sulfuric acid waste liquid;
[0036] (2) Decomposing sodium fluorosilicate at a temperature of 750° C. for 2 hours to generate sodium fluoride solid and silicon tetrafluoride gas;
[0037] (3) Absorb silicon tetrafluoride gas with water and hydrolyze it, filter to obtain 35% fluorosilicic acid solution, return to make sodium fluorosilicate, wash and dry the silicon dioxide solid to obtain white carbon black;
[0038] (4) React the sodium fluoride solid generated in step (2) with 100% sulfuric acid at a temperature of 300°C for 2 hours, the gas produced is condensed and rectified to obtain hydrofluoric acid, and the solid sodium sulfate is returned to produce fluorosilicic acid s...
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