Question

Information on fire refining of copper

Answer 1

Explanation:

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Answer...

Fire refining

The initial product of copper smelting was impure black copper, which was then repeatedly melted to purify it, alternately oxidizing and reducing it.

In one of the melting stages, lead was added. ...

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The repeated application of such fire-refining processes was capable of producing copper that was 99.25% pure.