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A novel hydrothermal process was developed to extract zinc from pure zinc ferrite(ZnFe_2O_4) nanopowder and zinc-containing electric arc furnace(EAF) dust using hexahydrated ferric chloride(FeCl_3-6H_2O) as a decomposing agent.The effects of solid FeCl_3-6H_2O to ZnFe_2O_4 ratio by mass(R_(F/Z)),hydrothermal reaction temperature,and time on zinc extraction were systematically investigated.In the results,when the hydrothermal reaction is conducted at 150℃ for 2 h with R_(F/Z) of 15:20,the efficiency of zinc extraction from ZnFe_2O_4 reaches97.2%,and the concentration of ferric ions(Fe~(3+)) in the leaching solution is nearly zero,indicating a high selectivity for zinc.In addition,the zinc extraction efficiency from the EAF dust reaches 94.5%in the case of the hydrothermal reaction performed at 200℃ for 10 h with the solid FeCl_3-6H_2O to EAF dust ratio by mass(R_(F/EAF dust)) of 15:10.Zinc and iron separation is achieved by adjusting the pH value of the leaching solution according to the different precipitation pH values of metal hydroxides.
A novel hydrothermal process was developed to extract zinc from pure zinc ferrite (ZnFe_2O_4) nanopowder and zinc-containing electric arc furnace (EAF) dust using hexahydrated ferric chloride (FeCl_3-6H_2O) as a decomposing agent. These effects of solid FeCl_3-6H_2O to ZnFe2O4 ratio by mass (R_ (F / Z)), hydrothermal reaction temperature, and time on zinc extraction were systematically investigated. In the results, when the hydrothermal reaction is conducted at 150 ° C for 2 h with R_ (F / Z) of 15:20, the efficiency of zinc extraction from ZnFe_2O_4 reaches 97.2%, and the concentration of ferric ions (Fe ~ (3+)) in the leaching solution is nearly zero, indicating a high selectivity for zinc. In addition, the zinc extraction efficiency from the EAF dust reached 94.5% in the case of the hydrothermal reaction performed at 200 ° C for 10 h with the solid FeCl_3-6H_2O to EAF dust ratio by mass (R_ (F / EAF dust)) of 15: and iron separation is achieved by adjusting the pH value of the leaching solution according t o the different precipitation pH values of metal hydroxides.