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
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[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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