A hydrometallurgical process for recovering zinc in sulfur media starting from zinc sulfide concentrate

摘要

The zinc concentrate is subjected to the following stages: a. Roasting of at least part of the zinc concentrate. b. Neutral leaching where zinc oxide is dissolved. c. Acid leaching where zinc ferrites are leached. d. Reduction of the Fe +++ contained in the solution to Fe ++ by means of the addition of zinc concentrate. e. Neutralization of the acidity in the solution with calcine. h. Oxidation of iron and precipitation of jarosite, free of contaminating solids, by means of the injection of oxygen or oxygen-enriched air and the addition of an alkali or an alkaline salt. Additionally, following the neutralization stage (e), it is possible to incorporate a stage (f) to re-leach the residue for the precipitation of arsenic and allied impurities, and a stage (g) of cementation of Cu, and following stage (c) a stage (i) of reduction of iron and direct leaching.