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Method for preparing sodium hydrogen fluoride from phosphorus chemical byproduct fluosilicic acid

A technology of sodium bifluoride and fluosilicic acid, which is applied in the direction of alkali metal fluoride, etc., can solve the problems of not being able to make full use of economic value

Active Publication Date: 2021-01-15
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Fluorosilicic acid is a common by-product in the phosphorus chemical industry. The existing treatment methods are generally harmless treatment, which cannot make full use of its economic value.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for preparing sodium bifluoride by using fluorosilicic acid, a by-product of phosphorus chemical industry, comprising:

[0023] S1. Reacting fluosilicic acid, a by-product of phosphorus chemical industry, with ammonia water, and performing solid-liquid separation after the reaction, to obtain component A in solid phase and component A in liquid phase.

[0024] S2. React the liquid phase component A with the slaked lime, and perform the first three-phase separation after the reaction to obtain the solid phase component B, the liquid phase component B and the gas phase component A.

[0025] S3. React the solid phase component B with concentrated sulfuric acid, and perform a second three-phase separation after the reaction to obtain solid phase component C, liquid phase component C and gas phase component B.

[0026] S4. React the gas phase component B with saturated sodium carbonate solution, and perform the third three-phase separation after the reaction to obta...

Embodiment 2

[0030] Based on the method of preparing sodium bifluoride by using fluosilicic acid, a by-product of the phosphorous chemical industry, described in Example 1, the solid-liquid separation method described in step S1 is as follows: firstly, use a 80-100 mesh PTFE filter to perform the first filtration. Then take the filtrate part, dry and concentrate under negative pressure at 40-45°C for 15-20 minutes, and then filter for the second time with a 200-220 mesh PTFE filter. Finally, the filtrate part of the second filtration is taken to obtain the liquid phase component A, and the filter residue part of the first filtration and the second filtration is combined to obtain the solid phase component A.

[0031] By adopting the above solid-liquid separation method, the yield of the final product can be effectively improved. Compared with the single filtration of 80-100 mesh PTFE filter, the yield of the final product is increased from 94.5% to 96.2% on the basis of the rest of the tre...

Embodiment 3

[0033] Based on the method of preparing sodium bifluoride by using fluorosilicic acid, a by-product of the phosphorous chemical industry, described in Example 1, the method for the first three-phase separation described in step S2 is as follows: firstly, a condensing device is installed at the exhaust port of the reactor during the reaction , in parallel with the gas storage tank A to collect the gas phase components. Then after the reaction is completed, the mixture is filtered for the first time with a 60-80 mesh PTFE filter. Then take the filtrate part, dry and concentrate under negative pressure at 40-45°C for 60-70 minutes, collect the vapor product and combine it with the gas phase components in the gas storage tank to form gas phase component A. Then carry out second filtration with 120-150 mesh PTFE strainer successively, carry out third filtration with 200-220 mesh PTFE strainer. Finally, the filtrate part of the third filtration is taken to obtain the liquid phase c...

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Abstract

In order to overcome the defects in the prior art, the invention provides a method for preparing sodium hydrogen fluoride from a phosphorus chemical byproduct fluosilicic acid, which comprises the following steps of: S1, reacting the phosphorus chemical byproduct fluosilicic acid with ammonia water, and carrying out solid-liquid separation after the reaction is completed, thereby obtaining a solid-phase component A and a liquid-phase component A; S2, reacting the liquid-phase component A with slaked lime, and carrying out three-phase separation after the reaction is completed, so as to obtaina solid-phase component B, a liquid-phase component B and a gas-phase component A; S3, reacting the solid-phase component B with concentrated sulfuric acid, carrying out three-phase separation after the reaction is completed, so as to obtain a solid-phase component C, a liquid-phase component C and a gas-phase component B; S4, reacting the gas-phase component B with a saturated sodium carbonate solution, and carrying out three-phase separation after the reaction is completed to obtain a solid-phase component D, a liquid-phase component D and a gas-phase component C; and S5, sequentially dryingand crushing the solid-phase component D to obtain a sodium hydrogen fluoride product. Fluorosilicic acid can be prepared into sodium hydrogen fluoride, and the vacancy in the prior art is made up.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for preparing sodium hydrogen fluoride by using fluosilicic acid, a by-product of phosphorus chemical industry. Background technique [0002] Sodium hydrogen fluoride can be used for etching glass, tin plate manufacturing, textile processing, rust removal, and production of anhydrous hydrogen fluoride. It is also used as an anatomical specimen preservative and preservative, food protection agent, and can be used as a welding agent for metals when mixed with potassium hydrogen fluoride. It is a chemical preparation with wide application and high added value. [0003] Fluorosilicic acid is a common by-product in the phosphorus chemical industry. The existing treatment methods are generally harmless treatment, which cannot make full use of its economic value. Therefore, if a method can be provided that can prepare fluorosilicic acid, a by-product of t...

Claims

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Application Information

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IPC IPC(8): C01D3/02
CPCC01D3/02
Inventor 马业梅苏毅刘玉蒙韩乐裴婉莹胡亮
Owner KUNMING UNIV OF SCI & TECH
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