Cassiterite is concentrated by

Copper pyrites are concentrated by

The substance which is mixed with the ore for the removal of impurities is termed as

Identify the product formed when bauxite ore is treated with sodium hydroxide?

For the purification of alumina,the modern processes most useful when $(i)$ the impurity present is a lot of iron oxides and $(ii)$ the impurity present is a lot of silica,are:

$NaCN$ is sometimes added in the froth flotation process as a depressant when $ZnS$ and $PbS$ minerals are expected because