绿色矿冶

The leaching residues of zinc hydrometallurgy are different in composition, but all contain valuable metals such as zinc and silver, as well as heavy metals such as lead, cadmium and arsenic. They are hazardous wastes and need to be harmlessly treated and recovered. At present, the main zinc leaching residue treatment technologies in China include rotary kiln, fuming furnace, top blowing furnace and so on. These technologies have been applied for many years, and the technologies are mature and reliable, but there is still much room for improvement in energy conservation and environmental protection. In recent years, oxygen-enriched side-blowing technology has been successfully applied to the treatment of zinc leaching residue, mainly including the side-blowing submerged combustion technology of China ENFI and the Vanukov side-blowing technology. On the basis of summarizing the current situation of zinc leaching residue treatment technology, this paper introduced the melting mechanism of zinc leaching residue molten pool and the process flow of ' side blowing furnace + fuming furnace ', and introduced the application of two side blowing technologies of Vanukov side-blowing furnace and side-blowing submerged combustion furnace in China 's zinc smelting plant, and analyzed and compared the furnace structure, production operation and technical indicators. The side-blowing submerged combustion technology of China ENFI has the advantages of low energy consumption, controllable smelting temperature, simple operation, high degree of automation, low opening cost, stable flue gas and low nitrogen oxide content. In the future, it will become the mainstream treatment process of zinc smelting slag in China and even in the world.