# Activators for non-sulphide compounds in froth floatation

I was recently studying about Metallurgy.

Concise Inorganic Chemistry by J. D. Lee claims the process of froth floatation can also be applied to non-sulfide ores such as Malachite ($$\ce{CuCO3.Cu(OH)2}$$) and Anglesite ($$\ce{PbSO4}$$) by using $$\ce{Na2S}$$ as an activator.

The coatings formed are $$\ce{CuS}$$ and $$\ce{PbS}$$ respectively. However, in a previous example, they used $$\ce{CuSO4}$$ as the activator over a $$\ce{ZnS}$$ surface and a coating of $$\ce{CuS}$$ was formed.

Therefore, going by the same co-relation in the case of Malachite and Anglesite, shouldn't the coating be a sodium compound instead?

• – Loong Aug 11 at 17:39
• Sodium compounds are soluble, they won't stay. – Ivan Neretin Aug 16 at 19:40