Novel process and device for treating carnallite

Abstract

The invention discloses a novel process and device for treating carnallite, the device comprises a pulverized coal bunker, a conveying bunker, a gasification furnace, a melting furnace, a slag cooling tank and a slag lock hopper, the conveying bunker is located below the pulverized coal bunker, the melting furnace is located below the gasification furnace, the slag cooling tank is located below the melting furnace, the slag lock hopper is positioned below the slag cooling tank; the conveying bin is connected with the gasification furnace through a pipeline; the gasification furnace is provided with an inlet end and an outlet end, the inlet end of the gasification furnace is connected with a pipeline for conveying steam and oxygen, the pipeline for conveying the oxygen is provided with a heat exchanger, and the inlet end of the gasification furnace is also connected with a pipeline for conveying crude synthesis gas. The impurity-containing inorganic salt is solidified into the coal cinder, harmless treatment of the impurity-containing inorganic salt can be achieved, the solidification quality is stable, the problems of leakage, leaching and the like are avoided, the treatment cost is low, and obvious economic benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of processing inorganic and impurity-containing organic salts, in particular to a novel process and device for processing miscellaneous salts. Background technique [0002] In recent years, my country's coal chemical industry has developed rapidly, and a large amount of high-salt wastewater is produced in the production process. The wastewater has a large output and is difficult to treat, causing great environmental pollution. Generally, evaporative crystallization technology is used to process concentrated brine to obtain coal chemical crystallization salt. [0003] Because the salt has a large yield, is easily soluble in water, is not easy to solidify, and is easy to cause secondary pollution; therefore, the coal chemical industry crystalline salt is often required to be sent to the landfill as a hazardous waste for solidification treatment, and then landfilled. Curing technologies include cement curing, ...

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Problems solved by technology

Vitrification technology for crystalline salt solidification pretreatment has the advantages of large salt capacity, strong corrosion resistance to sulfuric acid salts, and good curing effect, but the vitrification technology is complex and requires high materials and high costs; the cement curing technology is simple and cost-effective. The operation is simple, the source of materials is wide, the price is cheap, and the strength of the cured product is high. However, the crystalline salt of the coal chemical industry contains a large amount of sulfuric acid salts, chlorides and organic substances, which will reduce its curing effect; Using 1 / 4-inch thick polypropylene or high-density polyethylene HDPE to encapsulate the crystalline salt can greatly reduce the leaching of the solidified body; however, no matter what method is used, the organic salt containing impurities in the crystallization of coal chemical industry is also easy to landfill. It is leached, and it is also possible that after 30-50 years, the curing measures and anti-seepage measures will age to cause leakage of organic salts containing impurities in landfills.

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