Question

Removal of the unwanted materials like sand, clays, etc. from the ore is known as _____, ______ or _____.

• A. concentration, dressing, benefaction
• B. separation, refining, gangue
• C. magnetic separation, Purification, gangue
• D. washing, refining, amalgamation

Answer 1

The correct option is A concentration, dressing, benefaction

• Removal of the unwanted materials (e.g., sand, clays, etc.) from the ore is known as concentration, dressing or benefaction.
  

• Before proceeding for concentration, ores are graded and crushed to a reasonable size.

• The concentration of ores involves several steps and the selection of these steps depends upon the differences in physical properties of the compound of the metal present and that of the gangue.