Treatment method for producing sodium silicofluoride as byproduct in inorganic fluoride production process

A technology for the production process of sodium silicofluoride, which is applied in the field of treatment of sodium silicofluoride by-product in the production process of inorganic fluorides. It can solve problems such as insufficient separation and low solubility of sodium fluoride, and achieve increased economic benefits and raw material utilization. High efficiency and good economic benefits

Active Publication Date: 2011-10-12
BAIYIN ZHONGTIAN CHEM
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  • Summary
  • Abstract
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Problems solved by technology

However, due to incomplete separation or pyrolysis during the production process, the by-product sodium fluoride will contain a large amount of silicon dioxide (i.e. silicon sodium fluoride), such as in the production of polysilicon by pyrolysis of fluorosilicic acid / sodium fluorosilicate Due to the limitation of reaction conditions during pyrolysis, the main components of pyrolysis residue are sodium fluoride and silicon dioxide; another example is the production of cryolite co-production of silica by fluosilicic acid / sodium fluosilicate method due to the relatively low solubility of sodium fluoride Small, resulting in the ammonolysis of silica slurry mixed with sodium fluoride solids, insufficient separation and a large amount of sodium silicofluoride by-product

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  • Treatment method for producing sodium silicofluoride as byproduct in inorganic fluoride production process
  • Treatment method for producing sodium silicofluoride as byproduct in inorganic fluoride production process
  • Treatment method for producing sodium silicofluoride as byproduct in inorganic fluoride production process

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Embodiment 1

[0019] Example 1 The treatment method of the by-product sodium silicofluoride in the production process of inorganic fluorides in this example is as follows:

[0020] (1) 1 ton containing 8% SiO 2 Sodium silicofluoride with 0.3 m 3 The sodium hydroxide solution with a concentration of 30% is reacted to generate sodium fluoride and sodium silicate solution, which is filtered and washed, and the filter cake is dried to obtain sodium fluoride; (2) the generated sodium silicate solution is mixed with 5 m 3 The reaction of the fluorine-containing acidic mother liquor, wherein the concentration of hydrochloric acid in the fluorine-containing acidic mother liquor is 5%, generates silicon dioxide and sodium chloride solution, and the liquid-solid separation is carried out through filtration; (3) the silicon dioxide generated in the previous step is mixed with the reaction A certain amount of fluorosilicic acid solution containing hydrofluoric acid reacts to produce fluorosilicic aci...

Embodiment 2

[0021] Embodiment 2 The treatment method of the by-product sodium silicofluoride in the production process of inorganic fluorides in this embodiment is:

[0022] (1) 1 ton containing 12% SiO 2 Sodium silicofluoride with 0.4 m 3 The sodium hydroxide solution with a concentration of 30% is reacted to generate sodium fluoride and sodium silicate solution, which is filtered and washed, and the filter cake is dried to obtain sodium fluoride; (2) the generated sodium silicate solution is mixed with 6 m 3 The reaction of the fluorine-containing acidic mother liquor, wherein the concentration of hydrochloric acid in the fluorine-containing acidic mother liquor is 10%, generates silicon dioxide and sodium chloride solution, and the liquid-solid separation is carried out through filtration; (3) the silicon dioxide generated in the previous step is mixed with the reaction A certain amount of fluorosilicic acid solution containing hydrofluoric acid reacts to produce fluorosilicic acid; ...

Embodiment 3

[0023] Embodiment 3 The treatment method of the by-product sodium silicofluoride in the production process of inorganic fluorides in this embodiment is:

[0024] (1) 1 ton containing 15% SiO 2 Sodium silicofluoride with 0.5 m 3 The sodium hydroxide solution with a concentration of 30% is reacted to form sodium fluoride and sodium silicate solution, which is filtered and washed, and the filter cake is dried to obtain sodium fluoride; (2) the resulting sodium silicate solution is mixed with 8 m 3 Fluorine-containing acidic mother liquor reaction, wherein the concentration of hydrochloric acid in the fluorine-containing acidic mother liquor is 15%, to generate silica and sodium chloride solution, which are separated from liquid and solid by filtration; Fluosilicic acid solution containing hydrofluoric acid is reacted to produce fluosilicic acid; (4) Fluosilicic acid solution is reacted with a reaction amount of sodium chloride solution, and part of the sodium chloride solution ...

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Abstract

The invention relates to a treatment method for producing sodium silicofluoride as a byproduct in an inorganic fluoride production process. The technical scheme comprises the following steps: reacting the sodium silicofluoride with a sodium hydroxide solution, filtering, and drying a filter cake so as to obtain sodium fluoride; reacting a filtrate with a fluoride-containing acidic mother liquid so as to generate silica and a sodium chloride solution, filtering, and adding the generated silica in a fluosilicic acid solution containing hydrofluoric acid for reacting the silica with the hydrofluoric acid so as to prepare fluosilicic acid; and reacting the fluosilicic acid with the sodium chloride solution so as to prepare the sodium silicofluoride. The sodium silicofluoride can be used for producing cryolite, and the generated hydrochloric acid solution can be circularly used for producing the cryolite with a clay bittern method. In the method, the used raw materials are fluoride-containing solids and liquids which are byproducts in the fluoride production process, the production process is simple, and the raw material utilization is high; the content of the produced inorganic fluoride salt impurity is low, which meets the national standard; and by using the method, waste is turned into wealth, and the production idea of resource comprehensive utilization as well as energy conservation and environmental protection is achieved.

Description

technical field [0001] The invention relates to a treatment method for sodium silicofluoride by-product in the production process of inorganic fluorides. Background technique [0002] Climate warming, environmental pollution and resource depletion are prominent problems facing the world today. With the development of the fluorine chemical industry and the gradual depletion of fluorine resources, in order to achieve sustainable development, it is necessary to solve various problems of resource sources and environmental governance. ", the fluorine chemical industry can achieve long-term development. [0003] With the rapid development of the electrolytic aluminum industry, the demand for fluoride salts has increased sharply. Making full use of low-grade fluorine-containing resources, reducing fluorine loss in the production process of fluorine chemicals, developing high-performance fluorides and effectively recycling downstream fluorine resources are the future. The inevitab...

Claims

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Application Information

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IPC IPC(8): C01D3/02
Inventor 侯红军韩世军李云峰周小平任抗战王庆陈以春
Owner BAIYIN ZHONGTIAN CHEM
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