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Process of producing sodium hydrogenfluoride by using fluosilicic acid

A technology using fluosilicic acid and sodium bifluoride, which is applied in the chemical industry, can solve the problems of high cost of raw materials and insufficient quality of sodium bifluoride products, and achieve the effects of reducing raw material costs, increasing particle size, and ensuring quality

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

[0003] The traditional process of sodium bifluoride is produced by the reaction of anhydrous hydrogen fluoride and sodium hydroxide (or soda ash). The quality of sodium bifluoride obtained by the traditional method is not high enough, and the cost of raw materials is too high

Method used

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  • Process of producing sodium hydrogenfluoride by using fluosilicic acid
  • Process of producing sodium hydrogenfluoride by using fluosilicic acid

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Experimental program
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Effect test

Embodiment 1

[0030] 1. After beating the soda ash, pour 20% of the amount of fluorosilicic acid required by 0.9 times the amount of soda ash into the reaction kettle at a constant speed, start stirring, and add silicon complexing agent (sodium nitrilotriacetate) of 0.2% of the amount of fluorosilicic acid ), turn on the steam, fully react, and the pH value at the end of the reaction is 8.5-9.

[0031] 2. After the reaction in the reactor is complete, the solid-solid separation is carried out by using the specific gravity difference reaction solution, 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 centrifugation, it is dried and enters the next step.

[0032] 3. After drying, use sodium fluoride for beating, add 0.1% seed crystal (325 mesh sodium hydrogen fluoride), feed anhydrous hydrogen fluoride, and feed steam to control the temperature not lower than 60°C and co...

Embodiment 2

[0035] 1. After beating the soda ash, pour 20% of the amount of fluorosilicic acid required by 0.9 times the amount of soda ash into the reaction kettle at a constant speed, start stirring, and add silicon complexing agent (sodium nitrilotriacetate) of 0.2% of the amount of fluorosilicic acid ), turn on the steam, fully react, and the pH value at the end of the reaction is 8.5-9.

[0036] 2. After the reaction in the reactor is complete, the solid-solid separation is carried out by using the specific gravity difference reaction solution, 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 centrifugation, it is dried and enters the next step.

[0037] 3. After drying, use sodium fluoride for beating, add 0.15% seed crystal (325 mesh sodium hydrogen fluoride), feed anhydrous hydrogen fluoride, and feed steam to control the temperature not lower than 60°C and c...

Embodiment 3

[0040] 1. After beating the soda ash, pour 30% of the amount of fluorosilicic acid required by 0.9 times the amount of soda ash into the reaction kettle at a constant speed, start stirring, and add silicon complexing agent (sodium nitrilotriacetate) of 0.2% of the amount of fluorosilicic acid ), turn on the steam, fully react, and the pH value at the end of the reaction is 8.5-9.

[0041] 2. After the reaction in the reactor is complete, the solid-solid separation is carried out by using the specific gravity difference reaction solution, 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 centrifugation, it is dried and enters the next step.

[0042] 3. After drying, use sodium fluoride for beating, add 0.1% seed crystal (325 mesh sodium hydrogen fluoride), feed anhydrous hydrogen fluoride, and feed steam to control the temperature not lower than 60°C and co...

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Abstract

The invention provides a process of producing sodium hydrogenfluoride by using fluosilicic acid. Sodium hydrogenfluoride is produced and high purity silicon dioxide is co-produced by taking fluosilicic acid, sodium carbonate and hydrogen fluoride as main raw materials. According to the process provided by the invention, the quality of the sodium hydrogenfluoride product can be improved, the cost of the raw material sodium hydrogenfluoride can be lowered and the benefit of the sodium hydrogenfluoride production enterprise can be enhanced.

Description

technical field [0001] The invention belongs to the field of chemical industry, in particular to a process for producing sodium bifluoride by using fluosilicic acid. Background technique [0002] Sodium bifluoride is used as food preservative, animal specimen and anatomical specimen preservative and preservative. It is also used for etching glass and glass matting, tin plate manufacturing, acid washing treatment agent for textiles, rust removal, leather insect protection and raw material for tinplate production. Mixture with potassium hydrogen fluoride can be used as metal welding agent. It can also be used to generate anhydrous HF. [0003] The traditional process of sodium bifluoride is prepared by reacting anhydrous hydrogen fluoride and sodium hydroxide (or soda ash). The quality of sodium bifluoride obtained by the traditional method is not high enough, and the cost of raw materials is too high. Contents of the invention [0004] In view of the above-mentioned tech...

Claims

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Application Information

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IPC IPC(8): C01B9/08
Inventor 张军航
Owner JIANGXI QUCHENG CHEM
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