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

Explain the leaching of:
$(i)$ Alumina from Bauxite (Bayer's Process)
$(ii)$ Gold and Silver (Cyanide Process)

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:

In metallurgy,the term "gangue" is used for:

In the purification of bauxite by Hall's process:

Wolframite ore is separated from tinstone $(SnO_2)$ by which of the following processes?