Question

Smelting is done to eradicate unwanted materials like ___________ to the fullest extent possible.

(a) copper

(b) copper and gangue minerals

(c) sulfur

(d) sulfur and gangue minerals

I have been asked this question by my college director while I was bunking the class.

Asked question is from Manufacturing Processes of Copper and its Alloys in chapter Copper and its Alloys of Aerospace Materials & Processes

Answer 1

Correct option is (d) sulfur and gangue minerals

To explain I would say: Smelting is done to eradicate unwanted materials like sulfur and gangue minerals to the fullest extent possible. The output of the smelting phase is called copper matte. It is a combination of sulfur, copper and iron.