Salt and sodium sulfate separation method for treating high-concentration coal chemical industry brine by membrane-process and hot-process combined technology
A technology of combined process and separation method, which is applied in the field of thermal combined process for the separation of salt and nitrate of high-concentration brine in coal chemical industry and membrane method, which can solve the problems of environmental impact, large investment in spray drying, unseparated salt components, etc., and achieve Reduce investment and land occupation, realize resource utilization, simple and stable operation
Inactive Publication Date: 2017-11-14
EAST CHINA ENG SCI & TECH
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Problems solved by technology
Spray drying requires large investment, large land occupation, complex process and high energy consumption
[0007] As far as coal chemical projects currently in operation in China are concerned, two or three coal chemical projects have achieved "zero discharge of waste water", but there are also serious defects; for a project in Inner Mongolia that has been successfully operated, due to organic matter in the The zero discharge process is not well separated, the stable operation of the terminal crystallization process is difficult to be guaranteed, the water quality of the recovered condensate is difficult to meet the standard, the output crystalline salt is brown, and the main salt components are not separated, and the resource utilization of crystalline salt cannot be realized
If this situation is not effectively improved, it will not only affect the environment, but also seriously affect the economic benefits of the factory.
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Embodiment 1
[0037] The saline wastewater flow rate of a factory's return water station is 200m 3 / h, the total salt content is 20000mg / L, the chemical oxygen demand content is 100mg / L, the salt-to-nitrification ratio is 1.71, after the reverse osmosis process I is concentrated, the concentrated brine flow rate is 80m 3 / h, the total salt content is about 50000mg / L and sent to the electrodialysis system.
[0038] After electrodialysis concentration and separation of organic matter and inorganic salts, the volume of concentrated brine produced in the electrodialysis concentration chamber is 20 m 3 / h, the total salt content is 200g / L, the salt-to-nitrification ratio is still 1.71, the chemical oxygen demand content is ≤100mg / L, and it is pumped into the denitrification crystallization process. In the denitrification crystallization process, the concentrated brine is heated, evaporated and crystallized to obtain about 1.4t / h of sodium sulfate product. The denitrification mother liquor after...
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The invention discloses a salt and sodium sulfate separation method for treating high-concentration coal chemical industry brine by a membrane-process and hot-process combined technology. The method comprises the following process steps: (1) a reverse osmosis process I; (2) macroporous resin adsorption; (3) electrodialysis; (4) a reverse osmosis process II; (5) evaporation; (6) denitration crystallization; (7) desalting crystallization; and (8) drying. According to the method, steam condensate creatively serves as electrodialysis chamber inlet water, so that separation between organic matters and salt in the high-concentration coal chemical industry brine is realized; the mother solution is discharged by adopting a scraper film evaporator, the drying process route is greatly simplified, and investment in the drying process is reduced. With the adoption of the method, the water recycling rate can reach 99%, the recycling rate of sodium chloride can reach 96%, and the recycling rate of sodium sulfate can reach 96%. According to the method, resource utilization of the coal chemical industry wastewater can be realized to the greatest degree, environmental pollution is avoided, and the economic benefits are increased.
Description
technical field [0001] The invention relates to the technical field of coal chemical industry, in particular to a salt and nitrate separation method for treating high-concentration brine in coal chemical industry through a combination process of membrane method and thermal method. Background technique [0002] The coal chemical process is an industry that converts coal into gas, liquid, solid products or semi-products, and then further processes them into chemical and energy products. The actual characteristics of my country's energy resources are 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 devel...
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Login to View More IPC IPC(8): C02F9/10
CPCC02F1/048C02F1/08C02F1/285C02F1/441C02F1/4693C02F9/00C02F2001/5218C02F2301/08Y02A20/131
Inventor 袁良正邢明皓喻军吴越峰
Owner EAST CHINA ENG SCI & TECH