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Method for production of sodium fluosilicate from fluorine-containing acidic wastewater

A technology of acidic wastewater and sodium fluorosilicate, applied in the direction of silicon halide compounds, etc., can solve the problems of increasing production costs and waste of resources, and achieve the effects of recycling, reducing production costs, large economic benefits and environmental protection benefits

Inactive Publication Date: 2014-04-23
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For the fluorine-containing acidic wastewater produced by phosphorus chemical enterprises, lime is mainly added to the acidic wastewater for treatment, and the treated liquid phase reaches the industrial discharge standard before being discharged, which not only increases production costs, but also causes waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A method for producing sodium fluorosilicate from fluorine-containing acidic wastewater. Weigh 1000g of fluorine-containing acidic wastewater. The main components are 0.92% fluorine, 0.18% silicon dioxide, 0.22% sulfate, and 1.7% phosphorus , and then add 20g of sodium carbonate, add 10g of diatomaceous earth, and the reaction temperature is controlled at 50°C. The reaction time is 2 hours. After the reaction is completed, the solution is filtered, and the filter cake is dried to obtain the sodium fluorosilicate product. The content of sodium fluorosilicate in the product reaches more than 95%. The content of fluorine in the treated acid wastewater is 0.16%, the content of phosphorus is 1.6%, the content of silicon dioxide is 0.07%, and the content of sulfate is 0.19%. The treated water is returned to the feed grade calcium hydrogen phosphate plant for use as raw materials for production.

Embodiment 2

[0017] A method for producing sodium fluorosilicate from fluorine-containing acidic wastewater. Weigh 1000g of fluorine-containing acidic wastewater. The main components are 0.78% fluorine, 0.20% silicon dioxide, 0.20% sulfate, and 1.9% phosphorus , and then add 22g of sodium carbonate, add 15g of diatomaceous earth, and the reaction temperature is controlled at 60°C. The reaction time is 2.5 hours. After the reaction is completed, the solution is filtered, and the filter cake is dried to obtain the sodium fluorosilicate product. The content of sodium fluorosilicate in the product reaches 92%. The fluorine content in the treated acid wastewater is 0.11%, the phosphorus content is 1.8%, the silicon dioxide content is 0.10%, and the sulfate content is 0.20%. The treated water is returned to the feed-grade calcium hydrogen phosphate plant as a raw material for production.

Embodiment 3

[0019] A method for producing sodium fluorosilicate from fluorine-containing acidic wastewater. Weigh 1000g of fluorine-containing acidic wastewater. The main components are 0.85% fluorine, 0.20% silicon dioxide, 0.19% sulfate, and 1.9% phosphorus , and then add 20g of sodium carbonate, add 1,5g of diatomaceous earth, the reaction temperature is controlled at 70°C. The reaction time is 2 hours. After the reaction is completed, the solution is filtered, and the filter cake is dried to obtain the sodium fluorosilicate product. The content of sodium fluorosilicate in the product reaches more than 97%. The content of fluorine in the treated acid wastewater is 0.09%, the content of phosphorus is 1.7%, the content of silicon dioxide is 0.06%, and the content of sulfate is 0.20%. The treated water is returned to the feed grade calcium hydrogen phosphate plant for use as raw materials for production.

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Abstract

The invention discloses a method for production of sodium fluosilicate from fluorine-containing acidic wastewater. The method includes: taking fluorine-containing acidic wastewater as a raw material, adding a proper amount of diatomite and a sodium carbonate solution, controlling the reaction temperature and reaction time, filtering the solution at the end of reaction, and drying the filter cake, thus obtaining a sodium fluosilicate product. The added sodium carbonate and the acidic wastewater are in a mass ratio of 2.0%-2.2%, the added diatomite and the acidic wastewater are in a mass ratio of 1.0%-1.5%, the reaction temperature is 50DEG C-70DEG C, and the reaction time is 2h-3h. With the method provided by the invention, the fluorine content of the acidic wastewater is reduced to 0.1%-0.2% after treatment, and the phosphorus content is almost unchanged. Meanwhile, after deep defluorination, the treated water can be used for production of feed grade calcium hydrogen phosphate, thus realizing recycling of phosphorus, fluorine, and silicon resources. The method provided reduces the production cost, realizes recycling of resources, and has great economic benefits and environmental protection benefits.

Description

technical field [0001] The invention relates to the technical field of wet process phosphoric acid production. Specifically relates to a method for producing sodium fluorosilicate from fluorine-containing acidic wastewater. Background technique [0002] At present, chemical enterprises are facing severe environmental protection pressure. In large phosphorus chemical production enterprises, there is a large amount of fluorine-containing acidic wastewater. How to make good use of these wastewater and realize the reuse of waste resources is an urgent problem to be solved. The production of sodium fluorosilicate is generally produced by the reaction of fluorine-containing tail gas in phosphoric acid in the production process of compound fertilizer or in the process of concentration of phosphoric acid with sodium sulfate or sodium chloride. Chinese patents CN101972584 and CN102153091 all mention fluorine The production method of sodium silicate. [0003] For the fluorine-contai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/10
Inventor 胡国涛
Owner WENGFU (GRP) CO LTD