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What is roasting in metallurgy?...

What is roasting in metallurgy?

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In metallurgy, roasting is a process of extracting less reactive metals like zonc, silver, mercury etc. from their sulphate ores. In roasting the ore is heated in a regular supply of air in a furnace at a temperature below the melting point of metal. Then, metal sulphide gets converted into metal oxide which are then subject to thermal decomposition to obtain pure metal.
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