A method for continuous production of sodium fluoride

A sodium fluoride and sodium fluoride-containing technology, applied in the direction of alkali metal fluoride, silicon oxide, silicon dioxide, etc., can solve the problems of poor quality sodium fluoride, high labor intensity, high raw material consumption, etc., and achieve low raw material consumption , reduce labor intensity, the effect of excellent product quality

Active Publication Date: 2018-08-07
湖南新晶富新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims at the disadvantages of poor quality sodium fluoride and silicon dioxide products, intermittent operation, high labor intensity and high raw material consumption in the traditional method for producing sodium fluoride products.

Method used

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  • A method for continuous production of sodium fluoride
  • A method for continuous production of sodium fluoride

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Embodiment 1

[0037] The process block diagram of the continuous production of sodium fluoride in this embodiment is as follows figure 2 As shown, the specific steps are as follows:

[0038](1) Put the solid soda ash into the silo, put it into the dissolving tank at a speed of 1000kg / h with a screw conveyor, continuously add the mother liquor of the subsequent process into the dissolving tank, add the flow rate of 3600-4000kg / h, and heat it with steam under stirring Dissolve the soda ash at 75°C-78°C, keep the concentration (mass fraction) of the dissolved soda ash solution at 20-22%, and pump it continuously into the tubular reactor;

[0039] (2) Put solid sodium fluorosilicate (water content 6%) into the silo, add it into the pulping tank at a speed of 900kg / h with a screw conveyor, continuously add the mother liquor of the subsequent process in the pulping tank, and add the flow rate 2400-2600kg / h, heat to 75°C-78°C with steam under stirring, keep the solid-liquid ratio (mass fraction ...

Embodiment 2

[0048] The process block diagram of the continuous production of sodium fluoride in this embodiment is as follows figure 2 As shown, the specific steps are as follows:

[0049] (1) Put the solid soda ash into the silo, put it into the dissolving tank at a speed of 1000kg / h with a screw conveyor, continuously add the mother liquor of the subsequent process into the dissolving tank, add the flow rate of 3600-4000kg / h, and heat it with steam under stirring Dissolve the soda ash at 80°C-85°C, keep the concentration (mass fraction) of the dissolved soda ash solution at 26-28%, and pump it continuously into the tubular reactor;

[0050] (2) Put solid sodium fluorosilicate (water content 6%) into the silo, add it into the pulping tank at a speed of 900kg / h with a screw conveyor, continuously add the mother liquor of the subsequent process in the pulping tank, and add the flow rate 2400-2600kg / h, heat it with steam to 80°C-85°C under stirring, keep the solid-liquid ratio (mass fract...

Embodiment 3

[0059] The process block diagram of the continuous production of sodium fluoride in this embodiment is as follows figure 2 As shown, the specific steps are as follows:

[0060] (1) Put the solid soda ash into the silo, put it into the dissolving tank at a speed of 1000kg / h with a screw conveyor, continuously add the mother liquor of the subsequent process into the dissolving tank, add the flow rate of 3600-4000kg / h, and heat it with steam under stirring Dissolve the soda ash at 60°C-65°C, keep the concentration (mass fraction) of the dissolved soda ash solution at 23-25%, and pump it continuously into the tubular reactor;

[0061] (2) Put solid sodium fluorosilicate (water content 6%) into the silo, add it into the pulping tank at a speed of 900kg / h with a screw conveyor, continuously add the mother liquor of the subsequent process in the pulping tank, and add the flow rate 2400-2600kg / h, heat to 60°C-65°C with steam under stirring, keep the solid-liquid ratio (mass fraction...

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Abstract

The invention discloses a method of continuously producing sodium fluoride. The method comprises the following steps of: sequentially adding a sodium fluosilicate solution with mass fraction being 20-30% and a soda pollution with mass fraction being 20-30% into a tubular type reactor, controlling a reaction temperature to 60-100 DEG C, performing double decomposition reaction to generate sodium fluoride and silicon dioxide slurry, continuously introducing sodium fluoride and silicon dioxide slurry into a multi-stage floatator to perform flotation, thereby obtaining slurry containing sodium fluoride and slurry containing silicon dioxide after floating, and separately performing centrifuging, washing and drying, thereby obtaining a sodium fluoride product and a silicon dioxide product, wherein solutions obtained by centrifuging per time are combined for being recycled as a mother solution. According to the method disclosed by the invention, soda is excessively added in a reaction process, so that sodium fluosilicate sufficiently reacts, and therefore, a conversion rate is 100%. Purity of sodium fluoride produced by the method disclosed by the invention is higher than 98.5%, and purity of silicon dioxide is higher than 98.0%. According to the method disclosed by the invention, production scale investment is less, automatic control can be realized, labor intensity of staff is relieved, product quality is excellent and raw material consumption is low.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for continuously producing sodium fluoride. Background technique [0002] The traditional method of producing sodium fluoride and silicon dioxide using sodium fluorosilicate and soda ash as raw materials is a batch method, which has small production scale, high labor intensity, high consumption and poor product quality. The specific realization process is: (1) put the mother liquor or water into the dissolving tank, put in solid soda ash under stirring, after heating and dissolving, transfer it to the high level tank with a concentration of 20-22% soda ash solution; (2) put the mother liquor or water into the preparation Put solid sodium fluorosilicate into the slurry tank under stirring to prepare sodium fluorosilicate slurry with a solid content of 20-30%, and transfer it to the reactor; (3) start the reactor agitator and heat to 60- 80°C, add the soda ash s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D3/02C01B33/12
CPCC01B33/12C01D3/02C01P2006/80
Inventor 陈湘青罗小平付永宽张群志
Owner 湖南新晶富新材料有限公司
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