Method for recycling industrial waste salt

Abstract

The invention discloses a method for recycling industrial waste salt. The method comprises the following steps: taking waste salt containing relatively high ammonium chloride and organic waste salt for compatibility; heating and pyrolyzing the compatible waste salt to remove organic matters; cooling the pyrolyzed waste salt, and adding water for dissolving to prepare a solution; filtering the solution, and evaporating to obtain a mixed salt solid; preparing a plurality of tanks of saturated sodium chloride solutions, and performing salt washing on the mixed salt to obtain an industrial productsodium chloride; and adding sulfuric acid into the replaced saturated sodium chloride solution of sodium sulfate, absorbing hydrogen chloride gas in a reaction product by water to be converted into hydrochloric acid, filtering the sodium sulfate solution, and drying to prepare industrial sodium sulfate. The waste salt used in the method mainly contains ammonium chloride waste salt and organic waste salt, so that the problems that high-salt leachate is difficult to treat and the like after the waste salt is buried can be solved, meanwhile, sodium chloride and sodium sulfate are recycled, and resource recycling is achieved.

Description

technical field [0001] The invention relates to a method for resource recycling of industrial waste salt, which belongs to the field of environmental protection. Background technique [0002] In the fields of pesticides, pharmaceuticals, fine chemicals, organic chemicals, dyestuffs, coal chemicals and other chemical industries, a large amount of industrial waste salt is produced in industrial production. Traditional stacking or landfill methods not only occupy a large amount of land resources, but also require high processing costs. Improper use will also cause serious pollution of land and groundwater resources, posing a great threat to human life and the living environment. With the improvement of people's awareness of the hazards of industrial waste, the strengthening of the state's efforts to remediate industrial hazardous waste, and the development of related technical means, the harmless treatment and methods of industrial waste salt have attracted people's attention. ...

AI Technical Summary

Problems solved by technology

High-temperature incineration method: high-temperature incineration of industrial waste salt to achieve the purpose of removing organic matter in waste salt; due to the high-temperature treatment method, energy consumption is large, and investment and operating costs are high

Washing method: Wash the industrial waste salt with water and chemical detergent, neutralize and wash away the organic matter and impurities in the waste salt. This method can be used for industrial waste salt with a single organic component, low value, and fixed content. For industrial waste salt with many types of organic matter, high value and unstable content, it is difficult to moderately and reasonably control the amount of detergent, and it is difficult to completely remove organic matter in waste salt; in addition, after using this method to treat industrial waste salt, In the liquid, toxic and harmful organic substances or secondary pollutants may remain, and they still need to be treated harmlessly, and the treatment process becomes more and more complicated; therefore, it is not suitable for promotion and use in industrial production

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