Process and equipment for graded decomposition and carbonization harmless treatment of industrial waste salt

Abstract

The invention belongs to the field of environmental protection, and particularly relates to a process and equipment for graded decomposition and carbonization harmless treatment of industrial waste salt. According to the process and the equipment disclosed by the invention, aiming at the characteristics that each kind of industrial waste salt contains various organic materials and has different physicochemical properties, a plurality of grades of decomposition and carbonization furnaces are arranged to perform graded heating on the industrial waste salt; the heating process is reasonable; the organic materials are decomposed and carbonized within the respective decomposition and carbonization temperature range; the heat-containing exhaust gas generated by decomposition and carbonization is used as a dry heat source; the exhaust gas generated by drying is introduced into an incinerator for incineration; and the hot gas generated by incineration is recycled. According to the process and equipment disclosed by the invention, continuous industrial production is realized, and during the operation of the system, no melting, agglomeration or bonding of the waste salt occurs, no secondary pollutants are generated, no toxic and harmful gas is exhausted, thermal efficiency is high, energy is saved, environmental protection is achieved, and the investment cost is lower than that of other methods; and the process and equipment have the advantages that the process and equipment are high in practicality, are suitable for the removal and harmless treatment of the organic materials of the industrial waste salt in various fields, and are suitable for popularization in industrial production.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a process and equipment for graded decomposition, carbonization and harmless treatment of industrial waste salt. 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. Contains a variety of toxic and harmful organic substances or impurities. Using traditional stacking or landfill methods not only takes up a lot of land resources, but also requires high processing costs. If not handled properly, it will also cause serious pollution of land and groundwater resources. pose a great threat. [0003] 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 ...

AI Technical Summary

Problems solved by technology

[0004] Membrane separation method: use membrane treatment technology for industrial saline wastewater to filter out organic matter and impurities in industrial wastewater, and then concentrate or evaporate and crystallize the filtered saline wastewater. In addition to treatment, the treated brine may still contain a small amount of toxic and harmful organic substances or impurities. If it is necessary to meet national environmental protection requirements or reuse resources, it is still necessary to perform secondary harmless treatment on the treated liquid. Therefore, the treatment process is complicated , high investment and operating costs

[0005] 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, affected by factors such as temperature and technology, waste salt is prone to melting or softening and agglomeration, and sticks to the equipment In this process, the equipment will be severely corroded or obstructed, making the equipment unable to operate continuously; therefore, it is difficult to apply it to industrial production technology

In addition, due to the high temperature treatment method, the energy consumption is large, and the investment and operation costs are high

[0006] 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 is becoming more and more complicated; therefore, it is not suitable for promotion and use in industrial production

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