Method and equipment for impurity removal and enrichment of valuable metal zinc through zinc hypoxide

Abstract

The invention discloses a method for impurity removal and enrichment of valuable metal zinc through zinc hypoxide. The method is characterized by comprising two processes of a calcination section and a purification section, wherein in the calcination section, zinc hypoxide smoke raw materials with high fluoride and chlorine levels are fed into a fluidized bed combustion boiler and subjected to calcination, decarbonization, impurity removal and enrichment to recycle zinc oxide. According to the method, waste of zinc resources can be reduced, the cost advantage is obvious, and energy conservation and environment protection are realized.

Description

technical field [0001] The invention relates to the technical field of recycling high-fluorine chlorine suboxide fumes and impurities, and more specifically relates to a recovery method and equipment for removing high-fluorine chlorine suboxide zinc oxide fumes and removing impurities to enrich valuable metal zinc. Background technique [0002] Most of the lead-zinc mineral raw materials are symbiotic lead-zinc ores, and it is difficult to achieve complete separation of lead and zinc through preferential flotation. Lead-zinc ore smelting is to enrich zinc in slag, and then process the slag with a fuming furnace to produce zinc oxide or sub-zinc oxide. In addition, the leaching slag produced by the wet zinc smelting plant and the lean zinc oxide ore are fumed in a rotary kiln to obtain zinc oxide or sub-zinc oxide. The main component of secondary zinc oxide is ZnO, but the grade is generally 45% to 65%. The so-called "inferior" refers to the grade. In my country's Guangxi, ...

AI Technical Summary

Problems solved by technology

However, because such ash contains many impurities such as iron, carbon, chloride and a very small amount of fluoride, it cannot be directly used in smelting enterprises, and the fluorine and chloride ions contained in the high-fluorine chlorine suboxide zinc oxide dust have a great impact on the zinc electrolysis process. It has very adverse effects and brings great technical difficulties to the recycling process

This kind of soot has been processed and enriched by the rotary kiln process. The content of chloride ion in the produced product is between 0.9-1%, the content of fluoride ion is between 0.1-0.8%, and it contains high carbon and iron content. Zinc smelters are still not available

Some are directly treated as toxic waste, discarded and stacked at will, which brings great difficulty to the iron and steel regeneration smelting enterprises using electric arc furnaces, and causes waste of resources, and also pollutes the environment

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