A process and equipment for industrial waste salt grading decomposition carbonization and harmless treatment

Abstract

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. The process and equipment of the present invention are aimed at the diversification of organic matter contained in each industrial waste salt and its different physical and chemical properties. Several stages of decomposition and carbonization furnaces are set up to heat the industrial waste salt in stages. Decomposition and carbonization are completed in the carbonization temperature range, and the hot exhaust gas generated by decomposition and carbonization is used as a drying heat source. The exhaust gas generated by drying is introduced into the incinerator for incineration, and the hot gas generated by incineration is recycled. The invention realizes industrial continuous production, no waste salt melting, agglomeration or bonding during system operation, no secondary pollutants, no poisonous and harmful gas emissions, high thermal efficiency, energy saving and environmental protection, and investment cost lower than other methods , has strong practicability, is suitable for organic matter removal and harmless treatment of industrial waste salt in various fields, and is suitable for promotion 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 ...

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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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