HYDROMETALURGICAL PRODUCTION OF ZINC OXIDE FROM ROASTED ZINC CONCENTRATES

摘要

ABSTRACT OF THE DISCLOSUREA process is provided for obtaining high qualityhigh surface area zinc oxide from a roasted zinc sulphideconcentrate by leaching with an ammoniacal ammoniumcarbonate solution. The process utilizes optionalpreliminary oxidation and water leaching steps to removesoluble impurities and an optional aqueous sulphur dioxideleaching step to selectively remove readily soluble zincoxide. The process also includes an optional reducedpressure calcining step to produce zinc oxide with furtherincreased surface area.