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Method for recycling fluorine-containing waste gas in phosphorus chemical industry production

A phosphorus chemical and exhaust gas technology, which is applied in the direction of silicon oxide, silicon dioxide, fluorine/hydrogen fluoride, etc., can solve the problems of unfavorable industrial application, and achieve the effects of easy industrial application, low pollution, and simple process

Inactive Publication Date: 2014-05-21
武汉工程大学邮电与信息工程学院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] To sum up, the water absorption purification method and the adsorption purification method have their own advantages, but there are still certain defects, which are not conducive to industrial application. The alkali absorption purification method can overcome these shortcomings and has broad application prospects.

Method used

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  • Method for recycling fluorine-containing waste gas in phosphorus chemical industry production
  • Method for recycling fluorine-containing waste gas in phosphorus chemical industry production
  • Method for recycling fluorine-containing waste gas in phosphorus chemical industry production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add a sufficient amount of industrial ammonia water into the absorption tower to absorb fluorine-containing waste gas, control the reaction temperature in the tower to 45°C, and the reaction time is 1 hour, then filter the residue to obtain 937kg of ammonium fluorosilicate solution with a concentration of 12%; Add 3 kg of ammonia water with a concentration of 11% to the acid solution, . The ammonolysis reaction was carried out under the condition of 0, and the reaction was performed for 1 hour. After filtration, 334kg of silica precipitate and 685kg of ammonium fluoride solution were obtained. After the silica precipitate was washed with water, it was dried at a temperature of 110°C for 40 minutes to obtain a surface area of ​​750㎡ / g of white carbon black product 328kg; 685kg of ammonium fluoride solution (accounting for 40%) is returned to the absorption system for recycling to absorb fluorine-containing waste gas, and the rest is neutralized with 928kg of industrial g...

Embodiment 2

[0026] Add a sufficient amount of industrial ammonia water into the absorption tower to absorb fluorine-containing waste gas, control the reaction temperature in the tower to 50°C, and the reaction time to 2 hours, then filter the residue to obtain 1048kg of ammonium fluorosilicate solution with a concentration of 15%; Add 4kg of ammonia water with a concentration of 15% to the acid solution, . Under the condition of 5, carry out ammonolysis reaction, reaction 1 . Filtrate after 5 hours, obtain silica precipitation 368kg and ammonium fluoride solution 739kg, silica precipitation obtains the white carbon black product 362kg that surface area is 794㎡ / g under the condition of 115 ℃ of temperature after washing; 739kg of ammonium fluoride solution (accounting for 40%) is returned to the absorption system for recycling to absorb fluorine-containing waste gas, and the rest is neutralized with 985kg of industrial-grade slaked lime, the reaction temperature is controlled at 30°C, and ...

Embodiment 3

[0028]Add a sufficient amount of industrial ammonia water into the absorption tower to absorb fluorine-containing waste gas, control the reaction temperature in the tower to 55°C, and the reaction time to 3 hours, then filter the residue to obtain 1027kg of ammonium fluorosilicate solution with a concentration of 20%; Add 3kg of ammonia water with a concentration of 18% to the acid solution, . Ammonolysis reaction was carried out under the condition of 0, and after 2 hours of reaction, it was filtered to obtain 362kg of silica precipitate and 714kg of ammonium fluoride solution. The silica precipitate was washed with water and dried for 45 minutes at a temperature of 120°C to obtain a surface area of ​​805㎡ / g of white carbon black product 357kg; 714kg of ammonium fluoride solution (accounting for 45%) is returned to the absorption system for recycling to absorb fluorine-containing waste gas, and the rest is neutralized with 928kg of industrial grade slaked lime, and the reacti...

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Abstract

The invention discloses a method for recycling fluorine-containing waste gas in phosphorus chemical industry production. Originally, industrial ammonium hydroxide is utilized to absorb fluorine-containing waste gas to prepare ammonium fluosilicate solution which is soluble to water and high in stability, then ammonolysis reaction is carried out between ammonium hydroxide and ammonium fluosilicate solution and silicon dioxide sediment and ammonium fluoride solution are obtained after filtration; and the silicon dioxide sediment is washed with water and dried to obtain a white carbon black product. The prepared ammonium fluoride solution is partly fed to an absorption system for circulation, neutral reaction is carried out on the rest of prepared ammonium fluoride solution with industrial-grade slaked lime to prepare water-insoluble calcium fluoride and ammonium hydroxide, the ammonium hydroxide is fed to an aminolysis section for circulation, and finally, the high-purity calcium fluoride reacts with electronic-grade sulfuric acid obtained after twice rectification to prepare high-purity anhydrous hydrogen fluoride. The method is simple in process and low in investment and pollution, can be used for effectively recycling fluorine-containing waste gas, thereby solving the problem of environmental pollution, obtaining anhydrous hydrogen fluoride and white carbon black with high economic value; therefore, the method can be put into industrial application easily.

Description

Technical field [0001] The invention involves a method of recycling fluoride in the production of phosphorus chemical production, which belongs to the field of chemical technology. Background technique [0002] In recent years, affected by factors such as resources and environment, macroeconomic, and other factors, the country has paid more and more attention to energy conservation and emission reduction and comprehensive utilization of resource resource use, encouraging full use of scientific and technological innovation to drive industrial transformation and upgrading, and build ecological civilizations that circular economy and clean production.The top priority.Phosphate fertilizer is the pillar industry of the national economy. In 2012 2 0 5 The content meter), the output of one ammonium phosphate was 6.03 million tons, accounting for about 30.8%of the total output.At present, most factories use water to absorb fluoride -containing exhaust gas. On the one hand, the absorption...

Claims

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Application Information

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IPC IPC(8): C01B33/12C01B7/19
Inventor 徐旺生康顺吉赵俊华陈华郭勇李丽冯程程陈玺
Owner 武汉工程大学邮电与信息工程学院
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