New process for comprehensive utilization of hazardous waste resources containing heavy metal

Abstract

The invention discloses a new process for comprehensive utilization of hazardous waste resources containing heavy metal. The process comprises the following steps of S1, the hazardous waste containing the heavy metal is subjected to pretreatment and classified storage; S2, the hazardous waste containing the heavy metal, coke powder, bentonite, quartz sand or lime are mixed with water to form a mixture; S3, the mixture is subjected to ball pressing and drying; S4, pellets enter a rotary kiln after being screened, and powder returns to the step S2; S5, the operation temperature of the rotary kiln is reduced, and flue gas is treated to produce primary soot containing zinc and lead and secondary zinc oxide; S6, kiln slag is subjected to hot conveying o a melting electric furnace for smelting, residual zinc and lead are subjected to secondary reduction to volatilize to enter the flue gas, iron, nickel, chromium and manganese are reduced to produce molten iron, and molten slag is subjected to hot conveying to a step S7 for hardening and tempering; S7, solid waste is added into a hardening and tempering electric furnace to conduct hardening and tempering on the molten slag; and S8, a mineral wool board is produced from the qualified quenched and tempered molten slag. According to the method, the technical problems that thorough harmlessness and recycling of Waelz kiln slag and a waste catalyst are difficult, and ring formation is prone to occurring in the Waelz kiln are solved.

Description

technical field [0001] The present application relates to the technical field of comprehensive utilization of industrial solid waste resources, mainly the comprehensive utilization of heavy metal-containing dust, sludge, waste residue and waste catalyst resources, A new process for comprehensive utilization of hazardous waste resources containing heavy metals such as manganese. Background technique [0002] Zinc-containing dust, sludge and waste slag are of various types and large quantities, and most of them are hazardous wastes, mainly including zinc leaching slag, electric furnace soot, blast furnace bag ash, lead smelting blast furnace slag, zinc-containing electroplating sludge, hot-dip galvanizing dust ash, etc. In addition to containing higher zinc, it is usually accompanied by lead and iron. At present, the process of recovering zinc metal from these zinc-containing wastes at home and abroad is mainly the reduction and volatilization process of the rotary kiln, also...

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Problems solved by technology

[0008] The main purpose of this application is to provide a new process for the comprehensive utilization of hazardous waste resources containing heavy metals, so as to completely solve the defects of the Weltz process, and the high requirements for smelting waste catalysts, which cannot make better use of hazardous wastes containing heavy metals. Technical problems of environmental pollution and waste of resources

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