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Method for preparing high-purity ammonium salts from high-impurity ammonium salt waste liquor

A technology of pure ammonium salt and ammonium salt, which is applied in the direction of ammonium salt preparation, chemical instruments and methods, metallurgical wastewater treatment, etc., can solve the problems of high cost and complicated treatment process, and achieve high recovery rate, low cost and energy saving Effect

Active Publication Date: 2016-04-13
赣州逸豪优美科实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of the traditional treatment process of high-impurity and high-concentration ammonia-nitrogen wastewater produced by non-ferrous metal hydrometallurgy and high-concentration ammonia-nitrogen wastewater, the technical problem to be solved by the present invention is to provide a method with simple process, low cost, and high impurity concentration through reasonable treatment. High ammonia nitrogen wastewater, to achieve the purpose of zero discharge of wastewater while recovering ammonium salt

Method used

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  • Method for preparing high-purity ammonium salts from high-impurity ammonium salt waste liquor
  • Method for preparing high-purity ammonium salts from high-impurity ammonium salt waste liquor
  • Method for preparing high-purity ammonium salts from high-impurity ammonium salt waste liquor

Examples

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Effect test

Embodiment 1

[0032] Contains NH 4 + The high-impurity ammonium chloride wastewater with a concentration of 8g / L is deoiled to less than 1ppm by a CNO high-efficiency degreaser. Quicklime, adjust the final pH of the solution to 11, and the overflow velocity is 20m 3 / h, starting from the second-stage reaction tank to start heating and ventilation in sequence, the wind speed is 200m 3 / h, the temperature is 85°C, and the ammonia nitrogen at the overflow of the fourth-stage reaction tank is less than 8mg / L, then filter it, and use the membrane method ammonia recovery technology to recover NH in the absorption tower 3 , using secondary countercurrent 5% dilute hydrochloric acid to spray to prepare a high-concentration ammonium chloride solution. Finally enter the three-effect evaporator for concentration and crystallization. The primary steam temperature is above 95°C. MVR is used to provide the secondary heat source for the three-effect booster. The secondary steam temperature is above 90°...

Embodiment 2

[0036] Contains NH 4 + The high-impurity ammonium sulfate wastewater with a concentration of 24g / L is deoiled by a CNO high-efficiency degreaser to below 1ppm. After degreasing, the liquid enters a continuous four-stage pH adjustment reaction tank, and slaked lime is added to the first-stage reaction tank under stirring conditions. , adjust the final pH of the solution to 12, and the overflow velocity to 25m 3 / h, starting from the second-stage reaction tank to start heating and ventilation in sequence, the wind speed is 250m 3 / h, the temperature is 85°C, and the ammonia nitrogen at the overflow of the fourth-stage reaction tank is less than 8mg / L, then filter it, and use the membrane method ammonia recovery technology to recover NH in the absorption tower 3 , using secondary countercurrent 8% dilute sulfuric acid to spray to prepare a high-concentration ammonium sulfate solution. Finally, enter the three-effect evaporator for concentration and crystallization. The tempera...

Embodiment 3

[0040] Contains NH 4 + The high-impurity ammonium nitrate wastewater with a concentration of 25g / L is deoiled to below 1ppm by a CNO high-efficiency degreaser. After degreasing, the liquid enters a continuous four-stage pH adjustment reaction tank, and quicklime is added to the first-stage reaction tank under stirring conditions. , adjust the final pH of the solution to 12, and the overflow velocity to 35m 3 / h, starting from the second-stage reaction tank to start heating and ventilation in sequence, the wind speed is 400m 3 / h, the temperature is 85°C, and the ammonia nitrogen at the overflow of the fourth-stage reaction tank is less than 8mg / L, then filter it, and use the membrane method ammonia recovery technology to recover NH in the absorption tower 3 , using secondary countercurrent 8% dilute nitric acid spraying to prepare a high-concentration ammonium nitrate solution. Finally enter the three-effect evaporator for concentration and crystallization. The temperature ...

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Abstract

The invention relates to the field of sewage treatment, in particular to a technology for effectively treating high-impurity high-ammonia-nitrogen wastewater to recycle ammonium salts by combining multiple techniques. The ammonium salts comprise the ammonium chloride salt, the ammonium sulfate salt, the ammonium nitrate salt, the ammonium phosphate salt and the like, after efficient degreasing is performed on the high-impurity high-ammonia-nitrogen wastewater generated in the production process through a CNO degreaser, four stages of continuous overflow reaction equipment are adopted, a pH regulator is added in the first-stage reaction tank to regulate solutions, and corresponding high-concentration and high-purity ammonium salt solutions are generated in the second-stage reaction tank, the third-stage reaction tank and the fourth-stage reaction tank through treatment. The ammonium salt solutions are pumped into a triple effect evaporator, crystallized ammonium salts are separated out through a centrifugal machine and dried, the ammonium salt products are obtained, and condensate water and effluent ammonia nitrogen of the fourth-stage reaction tank are used for production or discharged out. The ammonium salt products produced through the technology are high in purity, and zero discharge of the ammonia-nitrogen wastewater is achieved. The technology has the advantages of being easy to operate, low in labor intensity, free of environmental pollution, capable of meeting the cleaner production standard and suitable for scale production.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a process for effectively treating waste water with high impurities and high ammonia nitrogen in combination with multiple technologies. Background technique [0002] In the process of non-ferrous metal hydrometallurgy, such as in the extraction process of cobalt, ammonia water is often used to saponify the organic phase; concentrated ammonia nitrogen wastewater. Due to its large discharge volume, complex composition, strong toxicity, great harm to the environment, and difficult treatment, if the ammonia nitrogen wastewater is discharged directly into the environment, it will inevitably pollute rivers and soil, cause a wide range of pollution to the environment, and cause water pollution. Waste of resources. At present, the technologies for treating high-concentration ammonia-nitrogen wastewater and recovering ammonium sulfate include extraction and purification, che...

Claims

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Application Information

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IPC IPC(8): C01C1/28C02F9/10C02F103/16C02F101/16
CPCC01C1/28C01P2006/80C02F1/047C02F1/048C02F1/40C02F1/66C02F9/00C02F2101/16C02F2103/16
Inventor 熊以俊刘东辉
Owner 赣州逸豪优美科实业有限公司
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