Production technology for producing sodium fluoride from sodium fluosilicate and co-producing white carbon black

A technology of sodium fluorosilicate and production process, which is applied in the fields of high-concentration salt-containing ammonia nitrogen wastewater treatment and fluorosilicon resource utilization, can solve the problem that it is difficult for white carbon black to reach the standard used in the rubber industry, and the purity of sodium fluoride is difficult to reach first-class products. requirements and other issues, to avoid frequent updates of mother liquor, prevent aggregation, and achieve good separation effects.

Inactive Publication Date: 2018-11-06
HUNAN UNIV OF TECH
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The separation of sodium fluoride and white carbon black is a key technology that affects the purity of the product. Sodium fluoride and silicon dioxide are easily entrained with each other, makin...

Method used

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  • Production technology for producing sodium fluoride from sodium fluosilicate and co-producing white carbon black

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Effect test

Embodiment 1

[0025] Embodiment 1: a kind of technique that utilizes sodium fluorosilicate to produce sodium fluoride to co-produce white carbon black, take sodium fluorosilicate and sodium carbonate as raw material, the molar ratio of sodium fluorosilicate and sodium carbonate is 1:1.05, It mainly includes the following steps:

[0026] (1) Pulping: Add sodium fluorosilicate to the feeding tank 1 with mother liquor according to the feeding ratio, stir and dissolve to form sodium fluorosilicate slurry, and transport it to the reactor through the head tank;

[0027] (2) Alkali dissolving: add sodium carbonate to the feeding tank 2, dissolve it with the mother liquor at the same time, stir to form a sodium carbonate solution of about 30%, filter to remove insoluble impurities, and transport it to the reactor through the head tank;

[0028] (3) Reaction: transport the sodium fluorosilicate slurry to the ultrasonic reactor, heat the steam to 90°C and slowly add the sodium carbonate solution to s...

Embodiment 2

[0032] Embodiment 2: A kind of technology that utilizes sodium fluorosilicate to produce sodium fluoride to co-produce white carbon black, take sodium fluorosilicate and sodium carbonate as raw material, the feeding molar ratio of sodium fluorosilicate and sodium carbonate is 1:1.25, It mainly includes the following steps:

[0033] (1) Pulping: Add urea (the amount is 1.0% of the mass of the mother liquor) to the feeding tank 1 with the mother liquor, add sodium fluorosilicate according to the feeding ratio, stir and dissolve to form a sodium fluorosilicate slurry, and transport it through the elevated tank to the reactor;

[0034] (2) Alkali dissolving: add sodium carbonate to the feeding tank 2, dissolve it with the mother liquor at the same time, stir to form a sodium carbonate solution of about 30%, filter to remove insoluble impurities, and transport it to the reactor through the head tank;

[0035] (3) Reaction: Transport the sodium fluorosilicate slurry to the ultrason...

Embodiment 3

[0039]Embodiment 3: A kind of technology that utilizes sodium fluorosilicate to produce sodium fluoride to co-produce white carbon black, take sodium fluorosilicate and sodium carbonate as raw material, the feeding molar ratio of sodium fluorosilicate and sodium carbonate is 1:1.20, It mainly includes the following steps:

[0040] (1) Pulping: Add urea (the amount is 2.5% of the mass of the mother liquor) to the feeding tank 1 containing the mother liquor, add sodium fluorosilicate according to the feeding ratio, stir and dissolve to form a sodium fluorosilicate slurry, and transport it through the elevated tank to the reactor;

[0041] (2) Alkali dissolving: add sodium carbonate to the feeding tank 2, dissolve it with the mother liquor at the same time, stir to form a sodium carbonate solution of about 30%, filter to remove insoluble impurities, and transport it to the reactor through the head tank;

[0042] (3) Reaction: Transport the sodium fluorosilicate slurry to the ult...

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Abstract

The invention relates to a production technology for producing sodium fluoride from sodium fluosilicate and co-producing white carbon black. Sodium fluorosilicate and byproduct white carbon black areobtained with sodium fluorosilicate and sodium carbonate or sodium carbonate decahydrate as raw materials through steps of pulping, alkali dissolution, reaction, settling separation, drying and the like. The reaction is conducted in an ultrasonic reactor and at least one ultrasonic generator is arranged in the reactor. The technology has the advantages as follows: reactants or products cannot scaron the wall of the reactor easily, the thermal resistance of the reactor is low, the heat transfer efficiency is high, and continuous production can be realized. The separation effect on sodium fluorosilicate and white carbon black is good, and the product purity is high; the refresh cycle of mother liquor is prolonged, the replacement amount of the mother liquor is reduced, waste liquor emissionis reduced, and the production is more environmentally friendly and more convenient.

Description

technical field [0001] The invention relates to a method for treating high-concentration salt-containing ammonia-nitrogen wastewater and resource utilization of fluorine and silicon, and is particularly suitable for the treatment and resource utilization of AC foaming agent wastewater. Background technique [0002] Sodium fluoride is an important chemical and pharmaceutical raw material, and is the main source of fluorine ions in fluorine compounds. White carbon black is a new type of inorganic material, which can be used as a reinforcing material in the rubber industry, and is widely used in the shoe industry and green tire industry. In industry, fluorosilicic acid, sodium fluorosilicate and soda ash are often used for metathesis reaction to produce sodium fluoride and white carbon black. The reaction products in the prior art are prone to scarring on the reactor wall, resulting in increased thermal resistance, reduced heat transfer efficiency, and greatly increased energy...

Claims

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Application Information

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IPC IPC(8): C01D3/02C01B33/12
CPCC01B33/12C01D3/02C01P2006/80
Inventor 李广利贺全国刘军罗小平
Owner HUNAN UNIV OF TECH
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