Study of the process of obtaining zinc chloride from zinc-containing concentrate

The article presents data on the production of zinc chloride by autoclave leaching of zinc from zinc concentrate with hydrochloric acid. The influence of the Zn : HCl ratio on the chemical composition of the liquid and solid phases, and the degree of zinc extraction by 28 % hydrochloric acid at a process duration of 10 hours was studied. The liquid phase contains mainly zinc chloride, concentrate impurities, of which calcium, iron, copper, cadmium, and lead predominate, with the their contents of 0.181–0.314 % for calcium and 0.951–1.654 % for lead. The temperature of the leaching process in this case is 65-75°C, the pressure is 1.72 MPa. The recovery rate at these parameters is 71.22–90.10 % depending on the Zn:HCI ratio. The optimal ratio is 1 : 1.1. It has been established that the interaction of zinc concentrate occurs in the kinetic region and continues in the diffusion region, where the duration of the process has a significant effect. The reaction rate constant versus temperature obeys the Arrhenius equation and the average activation energy is 4.05 kJ/mol.

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