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Method for comprehensive treatment of chemical strong brine

A technology for comprehensive treatment of concentrated brine, applied in chemical instruments and methods, multi-stage water treatment, water/sewage treatment, etc. The effect of economic advantages

Inactive Publication Date: 2017-06-20
科莱环保(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method not only solves the problem that chemical concentrated brine is difficult to handle, but also realizes the recycling of salt in concentrated brine, meets the requirements of sustainable development, and conforms to the concept of green environmental protection

Method used

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  • Method for comprehensive treatment of chemical strong brine

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 1) Membrane separation: pass the concentrated brine through the primary nanofiltration membrane and the secondary nanofiltration membrane to separate sodium sulfate and sodium chloride. The sodium produced water is further concentrated through the reverse osmosis membrane, the produced water is reused in the plant area, and the concentrated solution enters the concentrated brine storage tank;

[0044] 2) Evaporation and concentration of liquid salt: the sodium chloride concentrate in the concentrated brine storage tank is passed into the circulation pipe in the sodium chloride evaporation concentration device, and the feed liquid is pumped into the heating chamber by the circulation pump for heating. The upper limit of the saturated steam temperature is 158°C, and the upper limit of the pressure of the heating chamber is 0.6MPa. The heated feed liquid is evaporated and concentrated in the evaporation chamber. The sodium salt slurry is discharged from the salt leg into t...

Embodiment 2

[0051] 1) Membrane separation: pass the concentrated brine through the primary nanofiltration membrane and the secondary nanofiltration membrane to separate sodium sulfate and sodium chloride. The sodium produced water is further concentrated through the reverse osmosis membrane, the produced water is reused in the plant area, and the concentrated solution enters the concentrated brine storage tank;

[0052] 3) baking soda is made: the sodium sulfate concentrated water produced in step 1) is crystallized by cooling in a crystallization tower, adding mass ratio of sodium sulfate concentrated water and water of 1:1.5 in the crystallization tower in the crystallization process, carries out crystallization by cooling, Stir and crystallize for 30 minutes, then stand for crystallization for 20 minutes, and finally, stir and crystallize for 70 minutes to obtain sodium sulfate salt slurry. After the sodium sulfate salt slurry is washed with saturated sodium sulfate, it is stored in a c...

Embodiment 3

[0055] 1) Membrane separation: pass the concentrated brine through the primary nanofiltration membrane and the secondary nanofiltration membrane to separate sodium sulfate and sodium chloride. The sodium produced water is further concentrated through the reverse osmosis membrane, the produced water is reused in the plant area, and the concentrated solution enters the concentrated brine storage tank;

[0056]3) baking soda is made: the sodium sulfate concentrated water produced in step 1) is cooled and crystallized in a crystallization tower, and in the crystallization process, it is 1:0.5 sodium sulfate concentrated water and water to add mass ratio in the crystallization tower, carry out cooling crystallization, Stir and crystallize for 40 minutes, then stand for crystallization for 30 minutes, and finally, stir and crystallize for 80 minutes to obtain sodium sulfate salt slurry. After the sodium sulfate salt slurry is washed with saturated sodium sulfate, it is stored in a co...

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Abstract

Belonging to the technical field of resource recycling, the invention discloses a method for comprehensive treatment of chemical strong brine. According to the method, chemical strong brine is separated by a nanofiltration membrane to obtain a sodium chloride solution and a sulfuric acid solution, the sulfuric acid solution is then subjected to nitrate freezing purification in a cold way, then the product reacts with ammonia water and carbon dioxide gas to prepare sodium bicarbonate and ammonium sulfate products. The method provided by the invention solves the problem of difficult treatment of chemical strong brine, realizes recycling of miscellaneous salts in strong brine, and satisfies the requirements of sustainable development. At the same time, compared with salt method for preparation of sodium bicarbonate, the method can reduce the anticorrosion requirement of equipment and save the project investment for preparation of sodium bicarbonate, the byproduct ammonium sulfate has a value higher than ammonium chloride, thus having obvious advantages in economic benefit.

Description

technical field [0001] The invention belongs to the technical field of resource reuse, and in particular relates to a method for comprehensively treating chemical concentrated brine. Background technique [0002] High-salt wastewater refers to wastewater with a total salt content of at least 1%. It comes from a wide range of sources, mainly in industries such as electric power, oil refining, chemical industry, metallurgy, papermaking, and pesticides. Among them, the high-concentration salt wastewater in the coal chemical industry mainly comes from the coal gas washing wastewater in the production process, the drainage of the circulating water system, and the drainage of chemical water stations. It is characterized by high salt content, mostly Cl - , SO 4 2- 、Na + The pollutants are mainly total salt content (TDS). The density of this high-salt wastewater is high, and the activated sludge is easy to float and lose, which seriously affects the purification effect of the bio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01D7/18C01C1/242
CPCC01C1/242C01D7/18C01P2006/80C02F1/04C02F1/42C02F1/441C02F1/442C02F9/00C02F2301/08
Inventor 薛春水薛京宁李素青
Owner 科莱环保(北京)有限公司
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