Nepal class 11 chemistry of short question. Depending upon the nature of minerals present in the ores, calcination and roasting are mainly used for the conversion of ores into their respective oxides. (a) what do you mean by roasting and calcination in the metallurgical process? (b) name the vessel in which roasting is carried out. (c) write the name of two possible impurities that are removed in the roasting. by solution.
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a) While calcination is mostly used in the oxidation of carbonates, roasting is a method that is used for converting sulphide ores. During roasting, moisture and non-metallic impurities in the form of volatile gases are released. ... An example of roasting is when Zinc sulphide is converted into zinc oxide.
b) Reverbratory furnace.
c) Oxidation roasting is often used in sulfide ore smelting. It is used to remove the sulfur ore, arsenic, antimony, and other harmful impurities in ore. In oxidation roasting, the sulfide ore is first decomposed into low-valence sulfide and sulfur, and then the oxide is formed.
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