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ZnS+2H + ==== Zn 2+ +H 2 S ↑
In the 1950s and 1960s, there was a report on the use of nitric acid as a catalyst for oxidizing sulfide concentrates. In 1978, the laboratory of the Australian Electric Zinc Company (EZ) conducted a lot of research on this, and the results showed that nitrogen oxides and oxygen were produced. the reaction mixture was readily suspended in dilute sulfuric acid in the zinc sulfide concentrates, smelter in Australia Wriston has successfully completed the small-scale test with zinc sulphide concentrate leaching of NO x and expanding test, not only to obtain the basic technical parameters, and proved that NO x gases can be reused, the residual NO 3 - can be completely removed from the leach solution, the cleaned leachate for electrowinning when current good results.
Direct acid leaching of sulfides without an oxidizing agent at normal pressure produces H 2 S, which is difficult to achieve industrialization.