You are going to extract Zinc from Zinc Sulphide. Will you carry out the oxidation of ore? Support your answer with an appropriate reason. Also, which oxidation method will you use if your answer is ‘yes’?
Solution
Yes, we will need to carry out the oxidation of zinc sulfide (ZnS) to extract zinc.
The reason for this is that zinc sulphide is typically converted into zinc oxide (ZnO) before the actual reduction process. The oxidation step is essential because it transforms the sulfide ore, which is not directly reducible to metallic zinc, into an oxide form that can be easily reduced to obtain the metal.
The appropriate oxidation method to use for zinc sulfide is roasting as roasting is carried out to treat sulphide ores.
In this process, zinc sulfide is heated in the presence of oxygen, which causes it to react and convert into zinc oxide and sulfur dioxide gas. The chemical reaction can be represented as follows:
\(\rm ZnS\) + \(\ 3O_{2}\) → \(\rm 2ZnO\) + \(\rm 2SO_{2}\)