A kind of industrial salt slag pretreatment system and its pretreatment method

Abstract

The invention discloses an industrial salt slag pretreatment system and a pretreatment method thereof, which include a crusher and a pulping tank. The salt slag particles crushed by the crusher fall into the pulping tank with stirring function. It is connected with an organic matter adjustment system to remove the organic matter floating in the slurry in the pulping tank. The slurry outlet of the pulping tank is connected to the centrifuge through a conveying pipeline, and a salt slurry conveying pump is installed on the conveying pipeline to convey the salt slurry; The feed port of the dryer is connected, and the discharge port of the dryer conveys the dried salt slag particles into the bag filter and the transition silo through the airflow, and the salt slag particles output from the discharge end of the transition silo enter the pyrolysis tower. The present invention carries out pretreatment through steps such as salt slag crushing, salt slag making, homogenization, salt slurry storage, salt slag dehydration, salt slag drying, etc. After entering the pyrolysis tower, the salt slag is finally restored to the original crystalline state, and the pyrolysis system The temperature is stable, the removal rate of organic matter in the salt residue is high, the product can be recycled and reused, and it is green and environmentally friendly.

Description

Technical field: [0001] The invention relates to the technical field of resource utilization of industrial salt slag, in particular to an industrial salt slag pretreatment system and a pretreatment method thereof. Background technique: [0002] Industrial salt slag mainly comes from pesticides, pharmaceuticals, fine chemicals (intermediates), coal chemicals, printing and dyeing and other industrial industries, mainly for chemical reactions under acid and alkali conditions, salting out, color fixing treatment and other chemical reactions. The high-salt wastewater produced is treated by evaporation and crystallization process to obtain NaCl, Na 2 SO 4 One or more inorganic salts and organic pollutants, and other salts, mixtures of mechanical impurities are hazardous wastes. [0003] National industrial production produces a large amount of by-product salt slag every year. In 2017, the country produced 200,000 tons of coal chemical salt slag, 2.73 million tons of pesticide sa...

AI Technical Summary

Problems solved by technology

Incineration and high-temperature pyrolysis can remove most of the organic matter in the salt residue, but the content of organic matter in the salt is still high, which cannot meet the requirements of the soda ash and chlor-alkali industries for raw salt

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