WRITE ONE SIMILARITY AND DISIMILARITY BETWEEN ROASTING AND CALCINATION

Both the methods are used for the conversion of ores into their corresponding oxide. 
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https://www.meritnation.com/ask-answer/question/explain-with-example-calcination-and-roasting/metals-and-non-metals/2955692

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Roasting is a process in metallurgy in which a sulfide ore is heated in air. The process may convert a metal sulfide to a metal oxide or to a free metal.Example: Roasting ZnS may yield ZnO; roasting HgS may yield free Hg metal.Calcination is a thermal treatment process in presence of air applied to ores and other solid materials to bring about a thermal decomposition, phase transition, or removal of a volatile fraction. The calcination process normally takes place at temperatures below the melting point of the product materials.

Example, in limestone calcination, a decomposition process, the chemical reaction isCaCO3 → CaO + CO2(g)
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