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Method for preparing sodium hydrogen fluoride by using fluorosilicic acid, a by-product of phosphorus chemical industry

A technology of sodium hydrogen fluoride and by-products, applied in the direction of alkali metal fluoride, etc., can solve problems such as the inability to fully utilize economic value and the like

Active Publication Date: 2021-11-05
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 gas storage tank A to collect 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 component...

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Abstract

In order to solve the deficiencies in the prior art, the invention provides a method for preparing sodium bifluoride by using fluorosilicic acid, a by-product of phosphorus chemical industry, comprising: S1. reacting fluorosilicic acid, a by-product of phosphorus chemical industry, with ammonia water, and solidifying after the reaction is completed Liquid separation to obtain solid phase component A and liquid phase component A. S2. react the liquid phase component A with the slaked lime, and perform three-phase separation after the reaction to obtain the solid phase component B, the liquid phase component B and the gas phase component A. S3. React the solid phase component B with concentrated sulfuric acid, and perform three-phase separation after the reaction to obtain solid phase component C, liquid phase component C and gas phase component B. S4. React the gas phase component B with saturated sodium carbonate solution, and perform three-phase separation after the reaction to obtain solid phase component D, liquid phase component D and gas phase component C. S5. The solid phase component D is dried and pulverized in sequence to obtain the sodium bifluoride product. The invention can prepare fluosilicic acid into sodium hydrogen fluoride, which makes up for the vacancy in the prior art.

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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Patent Type & Authority Patents(China)
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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