RECOVERY OF VALUABLE METALS FROM LEAD FLUE DUST BY A INTERGRATED PROCESS

摘要

A intergrated process of sulfuric acid leaching, sodium chloride leaching, lead chloride crystallization, lead hydroxide synthesis and roasting was carried out for the recovery of lead, cadmium, copper and zinc from lead smelting dust containing various metals. The results showed that the separation of cadmium, zinc and copper from dust could be obtained after sulfuric acid leaching and corresponding leaching rate were 92.12%、 90.25% and 88.26% respectively. The subsequent sodium chloride leaching carried out for lead with optimized parameters as: sodium chloride concentration 250g/L, leaching temperature 90°C, leaching time 2h, pulp density 33g/L, 0.12mol/L CaCl_2; The lead compounds crystallization rate reached 86.67%, and then transferred into mPbO·nH_2O, the product of 98.66% β-PbO could be obtained through roasting under 502°C. In the end, a feasible method of β-PbO preparation from lead containing dust was put forward.