process of corrosion nd formation of oxide film is just reverse as in extractive metallurgy of metals.

Metallurgy is broadly divided into following branches :

1. Mechanical Metallurgy

2. Physical Metallurgy

3. Extractive Metallurgy

These are the basic divisions and these branches are further divided into various sub categories.

Paul Queneau has written:

'Extractive metallurgy of copper, nickel and cobalt'

Joseph Newton has written:

'Studies on the production of antimony oxide' -- subject(s): Antimony

'Extractive metallurgy' -- subject(s): Metallurgy

Carbonates are studied in chemistry. People do PhDs in this field. They are particularly studied in extractive metallurgy and geology.