Worlds of David Darling
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In metallurgy, the process of extracting a metal from its ore in a blast furnace or reverbatory furnace (one in which a shallow hearth is heated by radiation from a low roof heated by flames from the burning fuel). A reducing agent, usually coke, is used, and a flux is added to remove impurities. Sulfide ores are generally roasted to convert them to oxides before melting.

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