Metal ores and concentration; extraction of crude metal — thermodynamic principles (iron, copper, zinc) and electrochemical principles (aluminium); cyanide process for silver and gold; refining methods.
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Q1 · Isolation of Metals · MEDIUM
In the extraction of copper from copper pyrite (CuFeS₂), the ore is roasted in a reverberatory furnace. During this roasting process, the major reaction occurring is:
Q2 · Isolation of Metals · MEDIUM
In the extraction of copper from its sulfide ore, the flux used to remove iron oxide impurity and the composition of slag formed are respectively:
Q3 · Isolation of Metals · HARD
During the extraction of copper from its sulfide ore by the self-reduction process (auto-reduction), the key intermediate compound formed is: