Treatment method of industrial waste salt

Abstract

The invention discloses a treatment method of industrial waste salt. The treatment method comprises the following steps of crushing and homogenizing the waste salt and then feeding the waste salt intoa dryer; introducing air into a heat exchanger for heating by using a fan, filtering heated air and then feeding the filtered heated air from the bottom of the dryer to enable the waste salt positioned at the bottom of the dryer to float, and forming a gas lifting circulating flow in the dryer by the air; spraying a mist-shaped wall material into the dryer so as to wrap the waste salt to form microcapsule particles; and collecting the microcapsule particles. The treatment method realizes non-selective harmless treatment of the industrial waste salt by wrapping the industrial waste salt by thewall material to form microcapsules.

Description

technical field [0001] The invention relates to the technical field of environmental pollution control, in particular to a treatment method for industrial waste salt. Background technique [0002] Industrial waste salt also contains a large amount of organic or inorganic impurities. It cannot be used directly as industrial raw material salt, let alone for food or medical use. Most manufacturers pile it up; It has the characteristics of various types, complex components, high content of toxic and harmful substances, high processing costs, and great environmental hazards. The "National Hazardous Waste List" passed in 2016 has clearly included the waste salt produced in the chemical production process. At present, this situation has attracted great attention from relevant people at home and abroad, and due to the continuous high pressure on environmental protection in China, wastewater discharge Tend to zero discharge, and the industrial waste salt that finally achieves zero d...

AI Technical Summary

Problems solved by technology

The third treatment method is the most common, but due to the requirements of environmental protection policies and the unreasonable setting of landfills, the waste salt produced by many enterprises cannot be sent to landfills for disposal.

The harmless treatment of waste salt has been studied at present, but there are still many unresolved problems; for example, the Chinese patent document CN104344407A discloses a method for the harmless treatment of industrial waste salt slag, which uses microwave cracking to treat industrial waste salt. Although it can effectively remove the toxic and harmful organic substances contained in the waste residue, there is no explanation on how to deal with the waste residue after removing the toxic and harmful organic substances; The method of pyrolysis removes organic pollutants in waste salt, but it can only be used for toxic waste salt without heavy metals, and the energy consumption is high; or different methods need to be used to treat different substances contained in waste salt separately, such as Organic impurities are treated by heating and drying, and inorganic substances are recovered by other methods such as distillation, but there are many problems in temperature control, etc.

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