Metals and Ores

The followings are very important details in Kerala Public Service Examination point of view.Study tem with utmost care those who are preparing for forthcoming LDC &LGS Examination conducted by Kerala Public Service Commission

• Ore is a naturally occurring solid material from which a metal or valuable mineral can be extracted profitably.
• Metallurgy is the process of extracting metal in a pure state on a large scale from its ore by physical and chemical means.
• Gerog Agricola is author of De re Metallica, and important early book on metal extraction.
• Gangue is the impurity present in the ore.
• Calcination is the process of heating the ore below its melting point in the absence of air to remove volatile impurities like Arsenic.
• Roasting is the process in which the ore is heated below its melting point in the presence of air to oxidize the impurities. Eg: carbon, sulphur etc removed as their gaseous oxides.