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General methods of extraction for metals

Answer Text:
General methods of extraction
-Very few metal ores are concentrated enough for metal to be extracted without first purifying the ore to concentrate it. The process of concentrating an ore are:
(i) Removing any magnetic materials with a magnetic
(ii) Dissolving the mineral in a suitable solvent
(iii) Washing with water to remove earthy matter.
(iv) Froth floatation- this one of the method used in purifying metal ores.
-The ore is ground into a fine powder. It is then mixed with water containing special oils such pine oil as a frothing agent. A froth rich in minerals is
formed at the top while impurities sink to the bottom. The froth is skimmed and dried.