Calcination is a thermal decomposition process performed in the absence or limited supply of air. Its primary purpose is to drive off volatile substances like water (from hydrated ores) or carbon dioxide (from carbonate ores). For example, heating hydrated bauxite (Al2O3.nH2O) yields Al2O3 and H2O, while heating limestone (CaCO3) yields CaO and CO2.
During calcination process
Asked in MPSC CS Prelims 2019 · Topic: Metals, Minerals, Ores: Properties, Uses (Extraction of metals from concentrated ores (roasting, calcination, smelting, electrolytic reduction))
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Answer: C. (1) or (2), depending on type of ore
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