Question

Write all the reactions involved in the extraction of Zn from ZnS.

Answer 1

Roasting: The sulphide ores are converted into oxides by heating strongly in the presence of excess air. This process is known as roasting.

\[\ce{2ZnS_{(s)} + 3O2_{(g)} ->[Heat] 2ZnO_{(s)} + 2SO2_{(g)}}\]

Calcination: The carbonate ores are changed into oxides by heating strongly in limited air. This process is known as calcination.

\[\ce{ZnCO3_{(s)} ->[Heat] ZnO_{(s)} + CO2_{(g)}}\]