Method for sanitary production of sodium fluosilicate
A sodium fluorosilicate and clean production technology, applied in the direction of silicon halide compounds, etc., can solve the problems of not being able to meet the raw material requirements of high-end fluorine chemical products, increase the cost of sewage treatment, and not make good use of it, so as to reduce the cost of sewage treatment and reduce Production cost and effect of reducing sulfuric acid consumption
Inactive Publication Date: 2013-02-13
WENGFU (GRP) CO LTD
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Problems solved by technology
Most small and medium-sized wet-process phosphoric acid plants recover fluosilicic acid with a low concentration of only 8-12%, which cannot meet the raw material requirements of high-end fluorine chemical products. They are often directly discharged to sewage treatment or used to produce sodium fluosilicate and other products, which causes resour
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Embodiment
[0014] A factory adopts the method of the present invention to purchase 4,400 tons of sodium sulfate, prepare a solution containing 8-12% sodium sulfate by mass, and control the temperature at 35-60°C; the fluorosilicic acid used is: 80,000 tons of wet In the French phosphoric acid plant, the mass percent of fluosilicic acid obtained by absorbing phosphoric acid with water and overflowing fluorine from the concentration system is 8%-20%, the density is 1.06-1.18g / ml, and the fluosilicic acid is converted to pure (calculated as pure fluosilicic acid) The final mass totaled 3400 tons;
[0015] Specific operation: Add the prepared sodium sulfate solution into the fluosilicic acid at a speed from slow to fast while stirring, and the feeding time is controlled at 10-15 minutes, and the molar ratio of sodium sulfate to fluosilicic acid is controlled as follows: 1.1:1; After the sodium sulfate solution is added, continue to stir for 10 minutes, and then let it stand for 15-20 minutes...
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The invention discloses a method for sanitary production of sodium fluosilicate. Mirabilite is adopted by the method as raw materials to react with fluosilicic acid to form the sodium fluosilicate and dilute sulphuric acid. The dilute sulphuric acid is used as wet process phosphoric acid to filter dilute acid to digest. In the process of combination, firstly, water and the dilute sulphuric acid are added to the mirabilite, and then the mirabilite is put into a salt melting groove to dissolve, and after dissolving, the mirabilite contains sodium sulfate solutions ranging from 5% to 40%, and the mirabilite is put in a salt water groove to keep warm through steam to be used. Fluosilicic acid is added to a crystallization groove, and then sodium sulfate salt solutions are added to the crystallization groove, and so that sodium fluosilicate and the dilute sulphuric acid are prepared. After being filtered, the sodium fluosilicate and the dilute sulphuric acid are dried to prepare a sodium fluosilicate end product. The dilute sulphuric acid returns to a wet process phosphoric acid device to be used as washing water. The method for sanitary production of the sodium fluosilicate uses mother liquor which is generated in the production of the sodium fluosilicate as wet process phosphoric acid washing water, so that in the production of the sodium fluosilicate, pollution and sewage processing cost is not only reduced, but also in the process of extraction of the wet process phosphoric acid, consumption of sulfuric acid is simultaneously reduced. Therefore, production cost of the sodium fluosilicate and the wet process phosphoric acid is reduced.
Description
technical field [0001] The invention relates to compounds containing silicon, fluorine and other elements, in particular to a method for producing sodium fluorosilicate. Background technique [0002] A large amount of fluorine-containing gas is produced in the process of producing phosphoric acid from phosphate rock. At present, fluorosilicic acid is produced by absorbing it with water, and then processed into other products to recover fluorine resources from phosphate rock. Due to the reliable process and advanced equipment, the large-scale wet-process phosphoric acid plant can recover high-end fluorine chemical products such as anhydrous hydrogen fluoride and aluminum fluoride with a concentration of 18-20% of recovered fluosilicic acid. Most small and medium-sized wet-process phosphoric acid plants recover fluosilicic acid with a low concentration of only 8-12%, which cannot meet the raw material requirements of high-end fluorine chemical products. They are often directly...
Claims
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Inventor 刘海
Owner WENGFU (GRP) CO LTD
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