Method for enriching and recovering zinc-rich dust in zinc-containing gas

Abstract

The invention provides a method for enriching and recovering zinc-rich dust in zinc-containing coal gas, which comprises the following steps: (1) reducing and extracting zinc in zinc-containing solid waste in a solid waste treatment furnace, so that the reduced zinc enters high-temperature zinc-containing coal gas; (2) feeding the high-temperature zinc-containing coal gas into a primary coarse dust removal device for coarse dust removal so as to remove particles with the particle size of more than 150 microns in the coal gas; (3) feeding the coal gas subjected to coarse dust removal in the step (2) into a secondary dust removal device for secondary dust removal so as to remove particles with the particle size of 25-150 microns in the coal gas, thereby obtaining semi-purified coal gas; and (4) enabling the semi-clean gas to enter a fine dust removal device for fine dust removal so as to remove particles of which the particle sizes are less than 25 microns in the gas, thereby obtaining clean gas and zinc oxide-rich dust. According to the method, the multi-stage dust removal device is reasonably configured, so that the dust can be classified and collected, the dust removal efficiency is high, the operation is flexible, the running is stable, meanwhile, the collection of zinc oxide-rich dust can be realized, and a raw material is provided for the preparation of a high-purity zinc product.

Description

technical field [0001] The invention relates to a method for enriching and recovering zinc-rich dust in zinc-containing gas, and belongs to the technical field of smelting gas treatment. Background technique [0002] Based on the adverse effects of zinc-containing solid waste on the iron and steel production process, a lot of research has been carried out on the treatment of zinc-containing solid waste in the industry, mainly including wet process technology and pyrotechnic technology. In the actual production process, the coarse zinc oxide powder is generally recovered by pyro-enrichment, and then processed by wet leaching to obtain high-purity zinc products. Typical representatives of pyrotechnics include rotary kiln, rotary hearth furnace, small blast furnace, and shaft kiln. Newly built rotary kilns, rotary hearth furnaces, shaft kilns, etc. to treat zinc-containing solid waste have disadvantages such as complex process, high investment cost, and long recovery period, w...

AI Technical Summary

Problems solved by technology

[0014] The high-temperature flue gas only uses the cyclone dust collector for coarse dust removal. Although the dust removal efficiency is higher than that of the gravity dust collector, the collection efficiency of small particles of dust is low, and it cannot provide a reliable guarantee for the subsequent fine dust removal to enrich zinc-containing dust.

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