Vanadium-chromium-titanium waste salt refining system and method for chlor-alkali

Abstract

The invention discloses a vanadium-chromium-titanium waste salt refining system and a method for chlor-alkali. The refining system comprises a water distribution barrel, the water distribution barrel is sequentially connected with a pipeline mixer, a gas-liquid separator and a salt dissolving pond, the salt dissolving pond is connected with a titanium filter screen, the titanium filter screen is sequentially connected with a baffling groove, a first-stage reaction tank, a filtering head tank, a first-stage filter and a liquid inlet buffer groove, the liquid inlet buffer groove is sequentially connected with a first-stage heat exchanger, a second-stage heat exchanger, a chlorate decomposer and a second-stage reaction tank, the second-stage reaction tank is sequentially connected with a coarse filter and a second-stage filter, the coarse filter and the second-stage filter are both connected with a second-stage deslagging tank, the second-stage deslagging tank is connected with a second-stage plate-and-frame filter press, the first-stage filter and the first-stage heat exchanger are both connected with a first-stage slag discharge tank. The invention further comprises a using method of the system. The produced vanadium, chromium and titanium waste salt is reused in the chlor-alkali production process, and the technical problems that heavy metal such as vanadium, chromium and titanium and chlorate ions are difficult to remove, and industrial production is difficult are effectively solved.

Description

technical field [0001] The invention belongs to the technical field of waste water and waste salt treatment, and in particular relates to a refining system and method for vanadium-chromium-titanium waste salt used in chlor-alkali. Background technique [0002] In recent years, titanium production enterprises (sponge titanium and chlorinated titanium dioxide) have promoted the reduction of waste and secondary resources at the source, clean and environmentally friendly production, and introduced wastewater treatment systems and waste residue treatment systems to treat the salty waste liquid produced by the tail gas treatment systems of each process. And the salty slag discharged from the molten salt chlorination furnace. Produce high-salt wastewater mainly composed of sodium chloride, which is concentrated, evaporated, centrifuged and dried to obtain solid waste salt (NaCl). Due to the low content of sodium chloride in vanadium-chromium-titanium solid waste salt (≤93%), the w...

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Problems solved by technology

[0004] In view of the above deficiencies, the present invention provides a vanadium-chromium-titanium waste salt refining system and method for chlor-alkali, reducing the content of heavy metals such as vanadium-chromium-titanium and chlorate content in the waste salt, and reusing the produced waste salt in the chlor-alkali production process , which effectively solves the technical problem of difficult removal of heavy metals such as vanadium chromium titanium and chlorate ions, and is difficult for industrial production

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