Technology for producing sodium fluosilicate

A sodium fluorosilicate and production process technology, applied in the field of sodium fluorosilicate production process, can solve the problems of difficult sewage treatment in phosphoric acid production enterprises, large consumption of sodium sulfate, etc., to reduce sodium ion content, save treatment costs, reduce The effect of consumption

Inactive Publication Date: 2013-01-02
贵州开磷氟硅化工有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to provide a production process of sodium fluorosilicate, which solves the problems of large consumption of sodium sulfate and difficult sewage treatment of phosphoric acid production enterprises in the existing production technology of sodium fluorosilicate. find new ways to exploit

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  • Technology for producing sodium fluosilicate

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Effect test

Embodiment 1

[0040] Sodium sulfate is prepared into sodium sulfate solution 12 with a mass fraction of 26% in the salt tank 1; the sodium sulfate solution 12 is sent to the synthesis tank 2 with a pump, and it is added from the fluosilicic acid storage tank 3 while stirring. The mass fraction is 8% fluosilicic acid 13; control the consumption of sodium sulfate solution 12, adjust the consumption of fluosilicic acid 13, make the consumption of fluosilicic acid 13 more than 4% of the theoretical dosage calculated according to the chemical equation; sulfuric acid The sodium fluorosilicate magma 14 obtained after the reaction of sodium 12 and fluorosilicate 13 in the synthesis tank 2 is fed into the first crystallizer 4 to grow crystals to obtain sodium fluorosilicate crystals 15, and then enters the second crystallizer 5 to grow crystal; after the crystal growth is finished, wash off excess free acid with appropriate amount of industrial clear water 19 in the washing tank 6 to ensure the cryst...

Embodiment 2

[0042] Sodium sulfate is prepared into sodium sulfate solution 12 with a mass fraction of 29% in the chemical salt tank 1; the sodium sulfate solution 12 is sent to the synthesis tank 2 with a pump, and it is added from the fluosilicic acid storage tank 3 while stirring. The mass fraction is 11% fluosilicic acid 13; control the consumption of sodium sulfate solution 12, regulate the consumption of fluosilicic acid 13, make the consumption of fluosilicic acid 13 more than 4% of the theoretical consumption calculated according to chemical equation; Sulfuric acid The sodium fluorosilicate magma 14 obtained after the reaction of sodium 12 and fluorosilicate 13 in the synthesis tank 2 is fed into the first crystallizer 4 to grow crystals to obtain sodium fluorosilicate crystals 15, and then enters the second crystallizer 5 to grow crystal; after the crystal growth is finished, wash off excess free acid with appropriate amount of industrial clear water 19 in the washing tank 6 to ens...

Embodiment 3

[0044] Sodium sulfate is prepared into sodium sulfate solution 12 with a mass fraction of 32% in the salt tank 1; the sodium sulfate solution 12 is sent to the synthesis tank 2 with a pump, and is added from the fluosilicic acid storage tank 3 while stirring. The mass fraction is 14% fluosilicic acid 13; control the consumption of sodium sulfate solution 12, regulate the consumption of fluosilicic acid 13, make the consumption of fluosilicic acid 13 more than 6% of the theoretical consumption calculated according to chemical equation; Sulfuric acid The sodium fluorosilicate magma 14 obtained after the reaction of sodium 12 and fluorosilicate 13 in the synthesis tank 2 is fed into the first crystallizer 4 to grow crystals to obtain sodium fluorosilicate crystals 15, and then enters the second crystallizer 5 to grow crystal; after the crystal growth is finished, wash off excess free acid with appropriate amount of industrial clear water 19 in the washing tank 6 to ensure the crys...

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Abstract

The invention discloses a technology for producing sodium fluosilicate. The technology comprises the following steps of 1, preparing a sodium sulfate solution having the mass content of 26 to 32%, 2, adding fluosilicic acid having the mass content of 8 to 14% into the sodium sulfate solution with stirring, 3, controlling a use amount of the sodium sulfate solution, adjusting a use amount of fluosilicic acid so that compared with a theoretical use amount calculated by a chemical equation, the use amount of fluosilicic acid is increased by 3 to 6%, 4, carrying out crystallization after a reaction of sodium sulfate and fluosilicic acid, 5, washing, separating sodium fluosilicate crystals, and carrying out centrifugal drying, and 6, recovering sulfuric acid and fluosilicic acid. The technology reduces unit consumption of sodium sulfate, reduces sodion content of sewage and realizes recovery of sulfuric acid in the sewage. Compared with the prior art, the technology has high efficiency, is environmentally friendly, simple and convenient, and has low salt consumption and a low cost. Sewage produced by the technology for producing sodium fluosilicate can be directly recovered and used.

Description

technical field [0001] The invention relates to a production process of sodium fluorosilicate, which belongs to the technical field of chemical industry. Background technique [0002] The production method of sodium fluorosilicate can be divided into sodium chloride method and sodium sulfate method according to different raw materials. In theory, sodium fluorosilicate can also be produced with other sodium salts, but due to the high production cost of other sodium salts, industrial Rarely used. Sodium sulfate method and sodium chloride method are adopted by most manufacturers because of their cheap price and mature technology. Both the sodium sulfate production process and the sodium chloride production process have a common feature: the method of adjusting acid and salt is adopted, that is, the amount of fluosilicic acid is not changed when feeding, and the excess coefficient of salt is adjusted to match the acid. quantity. [0003] Although the production cost of the so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/10C01B17/69
Inventor 徐魁穆劲陈彬廖吉星朱飞武戴凌云石秀明潘礼富彭宝林
Owner 贵州开磷氟硅化工有限责任公司
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