Industrial waste salt converting device and method

Abstract

The invention discloses an industrial waste salt converting device and method. On the basis of a high-rate particle circulation and heat dispersion technology and a self-heat-balance and mutual-material-supply system that is established through a core waste salt converting furnace system, efficient curing and stabilizing of heavy metals and easily-soluble elements in hybrid salt are synchronouslyrealized; the rigid limitation of a conventional high-temperature burning harmless disposal technology, especially a cement rotary kiln co-processing technology, to elements in the waste salt is broken through; on the basis of the unique structure design and operation conditions of core equipment of a waste salt converting furnace, there is no liquid slag blockage risk or corrosion of high-temperature molten salt to a refractory lining pipeline, and the continuous, safe and stable operation can be realized; and the efficient and stable curing harmless disposal of soluble salt and heavy metalsand efficient and harmless decomposition of toxic organic matter in the industrial waste salt are synchronously realized.

Description

technical field [0001] The invention belongs to the field of industrial waste salt and hazardous solid waste treatment, and in particular relates to a high-efficiency conversion device and method for industrial waste salt. Background technique [0002] Industrial waste salt mainly refers to the by-product crystalline salts produced in industrial production, and the main components are solid hazardous wastes of one or more inorganic salts such as sodium chloride, sodium sulfate, sodium sulfide, and calcium chloride. Generally speaking, The soluble salt (TDS) content in industrial waste salt can reach up to 90wt%, and also contains a large amount of heavy metals such as Hg, Cr, Cd, Pb, As and refractory toxic organic pollutants, such as chlorobenzenes, nitrobenzenes, Phenols, etc., are typical hazardous solid wastes according to the hazardous waste identification standards. At present, the treatment methods for industrial waste salt with complex composition mainly include hig...

AI Technical Summary

Problems solved by technology

According to the "Standards for Hazardous Waste Landfill Pollution Control" (GB18598-2019) and the latest "Law of the People's Republic of China on the Prevention and Control of Environmental Pollution by Solid Waste (Revised in 2019)" and other laws and regulations, from June 1, 2020, enter the flexible safety Hazardous solid waste for landfill disposal in landfill, if the total amount of water-soluble salt exceeds 10% or the content of arsenic exceeds 5%, it must enter the rigid hazardous waste landfill for rigid landfill, which further increases the current industrial The landfill cost of waste salt, and because the rigid landfill has very high requirements for site selection, and other existing industrial waste salt treatment methods such as warm carbonization, high-temperature incineration, plasma melting, and cement kiln co-processing The method, cement / asphalt / resin stabilization and solidification method, etc. have varying degrees of complicated process flow, high requirements on the composition of feed materials, low-temperature molten salt corrosion prone to occur, long-term stable operation of equipment, high processing costs, small processing scale, and industrial The harmless treatment of waste salt is not complete, and there are bottlenecks such as secondary pollution. Therefore, in view of the bottleneck problems existing in the current industrial waste salt hazardous solid waste treatment and disposal technology, it is urgent to develop a simple process, low investment and operating costs and can be used Industrial waste salt high-efficiency conversion device and method for realizing long-term stable operation

Images