Integrated utilization method for phosphorus chemical industry byproduct fluorosilicic acid

A technology of fluorosilicic acid and by-products, applied in the field of phosphorus chemical industry, can solve the problems of single use of sodium fluorosilicate and limited sales of sodium fluorosilicate, and achieve the effects of high equipment utilization rate, inhibition of agglomeration and high reaction efficiency

Inactive Publication Date: 2008-07-09
YUNNAN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, most phosphate fertilizer manufacturers mainly use fluosilicic acid to produce sodium fluosilicate, while sodium fluosilicate has a single use, and the sales volume of sodium fluosilicate is very limited.

Method used

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  • Integrated utilization method for phosphorus chemical industry byproduct fluorosilicic acid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] At a temperature of 0°C, add 100 g of fluorosilicic acid solution with a concentration of 18% into the reactor, start stirring, and at the speed of 3000 rpm, add 150 g of ammonia water with a concentration of 13% dropwise at the same time, and remove the heat of reaction during the ammoniation reaction , After the reaction is completed, filter to obtain a silica gel filter cake, and the filter cake is washed and dried to obtain white carbon black. The main economic indicator of white carbon black is that the specific surface area is 350m 2 / g; DBP absorption value is 2.10.

Embodiment 2

[0024] At a temperature of 30°C, add 60g of a solution of 30% fluosilicic acid into the reactor, start stirring, and at a speed of 4000rpm, add 70g of ammonia water with a concentration of 30% dropwise at the same time to remove the heat of reaction while the ammoniation reaction is in progress. , After the reaction is completed, filter to obtain a silica gel filter cake, and the filter cake is washed and dried to obtain white carbon black. The main economic indicator of white carbon black is that the specific surface area is 160m 2 / g; DBP absorption value is 2.00.

Embodiment 3

[0026] At a temperature of 20°C, add 100g of fluorosilicic acid solution with a concentration of 18% into the reactor, start stirring, and at the speed of 1000rpm, add 105g of ammonia water with a concentration of 20% dropwise at the same time, and remove the heat of reaction during the ammoniation reaction , After the reaction is completed, filter to obtain a silica gel filter cake, and the filter cake is washed and dried to obtain white carbon black. The main economic indicator of white carbon black is that the specific surface area is 240m 2 / g; DBP absorption value is 2.15.

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Abstract

The invention discloses a comprehensive utilization method of hydrofluosilicic acid which is by-product of phosphorus chemical engineering. The method is that hydrofluosilicic acid solution with concentration of 18%-35% is added to a container with intense agitation and rapid heat withdrawing under -5 DEG C to 30 DEG C, the agitation is started with an agitation speed of 500rmp-10000rmp, simultaneously ammonia with concentration of 13%-37% is added, or ammonia gas is added. Silica gel is obtained by filtration, after the silica gel is washed and dried, finished product of white carbon black with surface area of 160-350m2 / g is obtained. The filtering liquid is ammonium fluoride solution with concentration larger than 20%, and the ammonification recovery ratio can reach more than 98%. The invention is simple in technique, the hydrofluosilicic acid is made good use of, and the produced white carbon black has good quality.

Description

technical field [0001] The invention relates to the technical field of phosphorus chemical industry, more specifically, the invention relates to a method for preparing white carbon black and ammonium fluoride by using high-concentration fluorosilicic acid, a by-product of phosphorus chemical industry. Background technique [0002] Fluorosilicic acid is a harmful by-product in the production process of phosphorus chemical industry, and its direct discharge will cause serious harm to the environment. Therefore, how to use the by-product fluorine resources of phosphorus chemical production, improve the comprehensive utilization of fluorine resources, and reduce the emission of by-product fluorine, Protecting the environment and creating more products with high added value are extremely important strategic guidelines for the development of fluorine chemical industry. However, in the prior art, most phosphate fertilizer manufacturers mainly use fluosilicic acid to produce sodium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12C01C1/16
Inventor 梁雪松吴立群梅毅杨亚斌王汝春朱严瑾
Owner YUNNAN CHEM RES INST
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