Kiln-opened flue gas treatment process in zinc-leaching residue volatilization kiln

Abstract

The invention relates to a kiln-opened flue gas treatment process in a zinc-leaching residue volatilization kiln. The process comprises the following steps: preparing kiln-opened flue gas in the volatilization kiln, removing dust in the kiln-opened flue gas of the volatilization kiln, transferring dust removal gas in a kiln tail dust collection bag, transferring dust removal gas in a settling bin, treating kiln-opened flue gas in a main flue pipe volatilization kiln and treating kiln-opened flue gas of the volatilization kiln which is adsorbed by a desulfurization tower. According to the process disclosed by the invention, diesel oil serves as auxiliary fuel, so that the kiln-opened flue gas in the volatilization kiln carries diesel flue gas, the diesel flue gas is capable of well absorbing the dust in the kiln-opened flue gas of the volatilization kiln, the efficiency of treating the kiln-opened flue gas in the volatilization kiln is improved, and the energy is effectively saved; the kiln-opened flue gas is simultaneously subjected to dust removal treatment by utilizing the kiln tail dust collection bag and the settling bin, so that the treatment efficiency of the kiln-opened flue gas is improved, and the equipment failure occurrence rate is reduced; and moreover, after activated carbon is added into a desulfurization dust catcher, valuable metals such as zinc, lead, silver, indium, cadmium and the like and sulfur dioxide gas in the kiln-opened flue gas of the volatilization kiln can be effectively recovered by the desulfurization dust catcher.

Description

technical field [0001] The invention relates to a process for treating flue gas of a zinc leaching slag volatilization kiln. Background technique [0002] Zinc leaching slag belongs to the hazardous waste in the "National List of Hazardous Wastes". The collection, storage, transportation, utilization, treatment and disposal of zinc leaching slag must comply with the national regulations on solid waste treatment, so the clean production and non-toxic Harmful treatment is an important problem that zinc smelting enterprises need to solve, and zinc leaching slag contains valuable metals such as zinc, lead, gold, silver, indium, and cadmium, and effective treatment of them can improve the production efficiency of zinc smelting enterprises. At present, many zinc smelters in China choose to process the zinc leaching slag of wet zinc smelting through the volatilization kiln system, that is, to recover zinc, lead, silver, indium, cadmium and other valuable metals through the volatili...

AI Technical Summary

Problems solved by technology

When the volatilization kiln system processes the zinc leaching slag of the hydrometallurgy, a large amount of flue gas from the volatilization kiln of the zinc leaching slag will be generated. The flue gas from the volatilization kiln of the zinc leaching slag is usually directly connected to The electrostatic dust removal treatment causes combustible organic matter to accumulate on the cathode and anode plates of the electric dust collector. The accumulated matter is likely to cause a short circuit and affect the dust collection effect. Directly using electric dust collector to treat the flue gas of the volatilization kiln will have great safety hazards. In order to avoid the adverse effects of combustible organic matter in the flue gas of the volatilization kiln on the electric dust collection, some zinc smelters will The flue gas is directly discharged. At this time, the emission of flue gas from the volatilization kiln not only fails to meet the national waste gas emission standards, but also seriously affects the cleanliness of the environment.

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