Question

What is roastinh write the equation for reaction in roasting of copper pyrite?

Answer 1

Explanation:

For the ores Cu2S (chalcocite) and ZnS (sphalerite), balanced equations for the roasting are: ... 2 ZnS + 3 O2 → 2 ZnO + 2 SO. The gaseous product of sulfide roasting, sulfur dioxide (SO2) is often used to produce sulfuric acid.

Answer 2

Answer:

In roasting we change some of the CuFeS2 to copper oxide and remove some of the sulphur as sulphur dioxide. Chalcopyrite is a copper iron sulfide mineral that crystallizes in the tetragonal system. It has the chemical formula CuFeS2.

Roasting is done by heating the concentrated ore from froth floatation. It is heated to betweem 500 °C and 700 °C in air. The product from the roaster is called calcine. It is a solid mixture of oxides, sulphides and sulphates. One reaction that takes place is:

2CuFeS2(s) + 3O2(g) → 2FeO(s) + 2CuS(s) + 2SO2(g)