Asked by  | 27th Dec, 2009, 06:29: PM

Expert Answer:

refer to Ellingham diagram:

In the graph of delta G0 vs T for formation of oxides, the Cu2O line is almost at the top. So it is quite easy to reduce oxide ores of copper directly to the metal by heating with coke (both the lines of C, CO and C, CO2 are at much lower positions in the graph particularly after 500 – 600K.

However, since most of the ores of copper are sulphide ores, these are first converted to oxides. The oxide is then easily reduced to metallic copper with coke.

Answered by  | 28th Dec, 2009, 09:50: AM

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