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Method for extracting high-purity sodium sulfate and sodium chloride products from high-salt content wastewater in coal chemical industry

A technology for sodium chloride and coal chemical industry, which is applied in the field of extracting high-purity sodium sulfate and sodium chloride from high-salinity wastewater of coal chemical industry, can solve the problems of environmental impact on the surrounding environment of the factory area, affect the economic benefits of the factory, etc., and achieve the effect of ensuring purity

Inactive Publication Date: 2016-11-16
EAST CHINA ENG SCI & TECH
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Problems solved by technology

If these waste salts are not properly treated, they will have a great impact on the surrounding environment of the factory area; if they are sent to the hazardous waste disposal center, it will seriously affect the economic benefits of the factory

Method used

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  • Method for extracting high-purity sodium sulfate and sodium chloride products from high-salt content wastewater in coal chemical industry

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Embodiment

[0022] Example The flow rate of saline wastewater at the outlet and return water station of a factory is about 525m 3 / h, the TDS content is about 10000mg / L, the salt-nitrate ratio is about 1.55, after the pretreatment device removes impurities and pre-concentration, the concentrated water flow rate is about 175m 3 / h, TDS is about 30000mg / L, and then sent to the nanofiltration system;

[0023] After being treated by the nanofiltration system, the amount of water on the concentrated water side of the nanofiltration is about 35m 3 / h, the total salt content is about 93000mg / L, the salt-nitrate ratio is about 0.14, and the COD content is about 760mg / L; after electrolytic oxidation, the COD content is reduced to about 100mg / L; enter the crystallization device, and finally get the product sodium sulfate About 2.8t / h;

[0024] After the nanofiltration product water is concentrated in two stages by reverse osmosis and electrodialysis devices, the water volume is about 9m 3 / h, af...

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Abstract

The invention provides a method for extracting high-purity sodium sulfate and sodium chloride products from high-salt content wastewater in the coal chemical industry. The method comprises the following steps: firstly, pretreating the high-salt content wastewater in the coal chemical industry to reduce the hardness thereof and primarily concentrate the wastewater till the TDS content is about 30000mg / L, and primarily separating sodium sulfate and sodium chloride from the high-salt content wastewater in the coal chemical industry by a nanofiltration process to obtain nanofiltration concentrated water with the sodium sulfate as a main component and a nanofiltration produced water with the sodium chloride as a main component; secondly, removing a part of organic matters from the nanofiltration concentrated water to reduce the COD by an electrolytic oxidizing technology, and performing a hot crystallization technology and a freezing crystallizing technology to obtain a pure sodium sulfate product and a small amount of sodium chloride product; treating the nanofiltration produced water by a membrane concentration technology and a hot crystallizing technology to obtain a pure sodium chloride product. In the whole technical process, on the basis of achieving zero discharge of the wastewater, reuse of all water and maximized recycle of the salts in the wastewater are achieved, so that the economic efficiency is improved and the environment pollution is avoided.

Description

technical field [0001] The patent of the invention belongs to the technical field of "zero discharge" of coal chemical industry, specifically a method for extracting high-purity sodium sulfate and sodium chloride from high-salt wastewater of coal chemical industry. Background technique [0002] The coal chemical process is an industry that converts coal into gas, liquid and solid products or semi-products, and then further processes them into chemical and energy products. At the same time, my country's actual energy is characterized by lack of oil and gas, relatively abundant coal resources, and relatively low coal prices. Therefore, the coal chemical industry has huge market demand and development opportunities in China. The new coal chemical industry will play an important role in the sustainable process of China's energy. It is of great significance for China to reduce environmental pollution caused by coal burning, reduce dependence on imported oil, and develop the domes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01D3/04C01D5/00
CPCC01D3/04C01D5/00C01P2006/80C02F1/048C02F1/22C02F1/44C02F1/441C02F1/442C02F1/4672C02F1/4693C02F9/00C02F2209/08C02F2209/10C02F2301/08C02F2303/22Y02A20/131
Inventor 邢明皓
Owner EAST CHINA ENG SCI & TECH
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