Question

Explain the process of obtaining "blister copper" from "copper matte" with equations.

Answer 1

Copper matte is charged in to Bessemer convertor. Hot air blast is blown to convert $C{u}_{2}S$ to metallic copper.
$2C{u}_{2}S+3O_2\to 2C{u}_{2}O+2S{O}_2$

$2C{u}_{2}O+C{u}_{2}S\to 6Cu+S{O}_2$

Some $C{u}_{2}S$ is oxidized to $C{u}_{2}O$. The reaction between $C{u}_{2}S$ and $C{u}_{2}O$ gives metallic copper. The process is auto reduction. The solidified copper obtained has blisters on the surface due to the evolution of $S{O}_2$. It is about 99% pure.