A METHOD FOR RECOVERY AND PRODUCTION OF ULTRAFINE ZINC POWDER

摘要

A method for recovery and production of ultrafine zinc powder from zinc-containing dust involves steps as follows: adding zinc-containing dust into alkaline solution, stirring the solution at the temperature 20?~60? and separating the solid and the liquid after zinc is leached into the solution; primary electrolyzing the obtained solution at the condition of a lower voltage and a lower current density to reduce the metals whose electro-positivity is higher than that of zinc and recovering the reduced metals; increasing the voltage and the current density to electrolyze intensively the solution obtained after the primary electrolysis so as to zinc powder being deposited on the cathode, and recycling the alkaline solution to the leaching stage; treating the obtained zinc powder with highly volatile liquid to dehydrolyze and dry it so as to obtaining pure and dry ultrafine zinc powder with different particle diameters, and recycling the highly volatile liquid; intensively leaching the metals that have not been leached by alkali and recovering them as raw material in smelting, while recycling the leach solution that contains lower content of zinc to the leaching stage.