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What is the reason for extracting copper from copper pyrites and not iron?

Chalcopyrite contains 34.5% Cu, 30.5% Fe, and 35.0% S. The mineral is the principal source of copper metal, and one of the major source of sulfur. Since copper is in majority, it is called "...
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What is the reason for extracting copper from copper pyrites and not iron?

Quoting from this source Copper pyrites contains only 2-3% of copper. The rest of ore contains iron as sulphide, silica, silicious materials, sulphur, arsenic etc as impurities. Froth floatation is ...
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