White carbon black production process for producing sodium fluoride and co-producing cryolite by using fluorosilicic acid

A production process, sodium fluoride technology, applied in the production process of sodium fluoride co-production cryolite white carbon black with fluorosilicic acid, can solve the problem of sodium fluoride yield, crystallinity, aluminum fluoride conversion rate is not high enough, waste water Can not be fully utilized, sodium fluoride raw material cost is high, etc., to achieve the effect of improving the efficiency of production enterprises, ensuring quality, increasing yield and enterprise efficiency

Active Publication Date: 2014-09-10
JIANGXI QUCHENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The traditional process of sodium fluoride is produced by the reaction of sodium fluorosilicate, a by-product of the phosphate fertilizer plant, with soda ash. The traditional process of cryolite is produced by the reaction of hydrofluoric acid, aluminum hydroxide and soda ash. The traditional process wastewater cannot be fully recovered. Utilization, the cost of treating wastewater is high, the yield of sodium fluoride, crystallinity and the conversion rate of aluminum fluoride are not high enough, and the cost of raw materials for sodium fluoride and cryolite is high

Method used

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  • White carbon black production process for producing sodium fluoride and co-producing cryolite by using fluorosilicic acid
  • White carbon black production process for producing sodium fluoride and co-producing cryolite by using fluorosilicic acid
  • White carbon black production process for producing sodium fluoride and co-producing cryolite by using fluorosilicic acid

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Effect test

Embodiment 1

[0029] 1. After dissolving sodium carbonate decahydrate with water or sodium fluoride mother liquor, pour 20% fluorosilicic acid into the reaction kettle at a constant speed of 0.9 times the reaction ratio, start stirring, turn on the steam, fully react, and the pH value at the end of the reaction is 8 -9.

[0030] 2. After the reaction of the solution in the reactor is complete, use the specific gravity difference reaction solution to carry out solid-solid separation after flotation, and the solid-solid separation is sodium fluoride and silicon dioxide. Silica can be sold as white carbon black after pressure filtration and drying. After sodium fluoride is centrifuged and dried, it is the finished product of sodium fluoride. Part of the sodium fluoride mother liquor is dissolved in sodium carbonate decahydrate, and the excess sodium fluoride mother liquor is filtered and then enters the sodium fluoride mother liquor storage tank as a raw material for producing cryolite.

[0...

Embodiment 2

[0034] 1. After dissolving sodium carbonate decahydrate with water or sodium fluoride mother liquor, pour 30% fluosilicic acid into the reaction kettle at a constant speed of 0.9 times the reaction ratio, start stirring, turn on the steam, and fully react. The pH value at the end of the reaction is 8 -9.

[0035] 2. After the reaction of the solution in the reactor is complete, use the specific gravity difference reaction solution to carry out solid-solid separation after flotation, and the solid-solid separation is sodium fluoride and silicon dioxide. Silica can be sold as white carbon black after pressure filtration and drying. After sodium fluoride is centrifuged and dried, it is the finished product of sodium fluoride. Part of the sodium fluoride mother liquor is dissolved in sodium carbonate decahydrate, and the excess sodium fluoride mother liquor is filtered and then enters the sodium fluoride mother liquor storage tank as a raw material for producing cryolite.

[003...

Embodiment 3

[0039] 1. After dissolving sodium carbonate decahydrate with water or sodium fluoride mother liquor, pour 40% fluorosilicic acid into the reaction kettle at a constant speed of 0.9 times the reaction ratio, start stirring, turn on the steam, fully react, and the pH value at the end of the reaction is 8 -9.

[0040] 2. After the reaction of the solution in the reactor is complete, use the specific gravity difference reaction solution to carry out solid-solid separation after flotation, and the solid-solid separation is sodium fluoride and silicon dioxide. Silica can be sold as white carbon black after pressure filtration and drying. After sodium fluoride is centrifuged and dried, it is the finished product of sodium fluoride. Part of the sodium fluoride mother liquor is dissolved in sodium carbonate decahydrate, and the excess sodium fluoride mother liquor is filtered and then enters the sodium fluoride mother liquor storage tank as a raw material for producing cryolite.

[0...

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Abstract

The invention provides a white carbon black production process for producing sodium fluoride and co-producing cryolite by using fluorosilicic acid. The production process is used for producing sodium fluoride and co-producing high-purity silicon dioxide and cryolite by using fluorosilicic acid, sodium carbonate decahydrate and aluminum hydroxide as main raw materials. The white carbon black production process provided by the invention can be used for reducing the cost of sodium fluoride and cryolite raw materials and further improving the benefits of sodium fluoride production enterprises.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a production process for producing sodium fluoride from fluosilicic acid and co-producing cryolite white carbon black. Background technique [0002] Sodium fluoride is mainly used as a phosphating accelerator in the coating industry to stabilize the phosphating solution, refine the phosphating film, and improve the performance of the phosphating film. The sealing of aluminum and its alloys in the phosphating has a very harmful negative catalytic effect Al 3+ , so that the smooth progress of phosphating wood preservatives, agricultural insecticides, brewing fungicides, pharmaceutical preservatives, welding flux, alkaline zincate galvanizing additives and enamel, paper, etc. [0003] Cryolite is mainly used as a flux for aluminum electrolysis; it is also used as a wear-resistant additive for grinding products, which can effectively improve the wear resistance, cutting ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/02C01B33/12C01F7/54
Inventor 张军航
Owner JIANGXI QUCHENG CHEM
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