Roasting and calcination: In metallurgy, the process of heating a concentrated ore in the presence of oxygen is known as roasting. Roasting is the process in which the ore is heated below its melting point in presence of air to oxidise the impurities. For ores containing carbonate or hydrated oxides, heating is done in the absence of air to melt the ores, and this process is known as calcination. a) Calcination and roasting are pre-treatments in metallurgy before metal extraction. This process is applied in the case of sulfide ores. This process can produce pure metals that are suitable for direct selling and alloys suitable as feed for further processing. The concentrate is mixed with other materials to facilitate the process. The process converts the ores to their oxides which can then be reduced. Roasting is a step of the processing of certain ores.More specifically, roasting is a metallurgical process involving gas–solid reactions at elevated temperatures with the goal of purifying the metal component(s). Ore is crushed and heated to a high temp using a strong blast of hot air. Often before roasting, the ore has already been partially purified, e.g. It is a process wherein the ore is heated either alone or with some other material in excess of air below the fusion point of the ore. Usually, this method is used for sulphide ores. In order to produce a mixed oxide-sulfate product Sulfation roastis preferred. eg: carbon, sulphur etc removed as their gaseous oxides. While roasting is a process that is used for converting sulphide ores, calcination is generally used in the oxidation of carbonates. Roasting is a metallurgical process involving gas–solid reactions at elevated temperatures with the goal of purifying the metal component(s). by froth floatation.The concentrate is mixed with other materials to facilitate the process. Roasting . by froth floatation.The concentrate is mixed with other materials to facilitate the process. b) Match the items of Column I with items of Column II. Metallurgical ContentChemistry of Oxidising RoastingIron Pyrites, FeS2Roasting Copper PyritesGalena, PbS – RoastingRoasting Arsenical Pyrites, FeAsSAntimonial Sulphide RoastingBlende, ZnS RoastingCarbonate of Lime, CaCO3Tellurides RoastingMetallic Gold, Silver RoastingRoasting to Eliminate Arsenic and AntimonyThe Use of Salt in RoastingLosses of Gold in RoastingCooling Roasted … Therefore, it is a branch of extractive metallurgy. Roasting. tion only partial roasting is practiced. Metallurgy concentration, roasting, smelting. In roasting, definite chemical changes take place to form oxide or chloride of the metal. Example: Roasting ZnS may yield ZnO; roasting HgS may yield free Hg . Roasting is a method of Metallurgy. by froth floatation. The process may convert a metal sulfide to a metal oxide or to a free metal. Often before roasting, the ore has already been partially purified, e.g. Calcination is the process of heating the ore below its melting point an absence of air to remove volatile impurities like arsenic etc. Often before roasting, the ore has already been partially purified, e.g. It converts an ore into its oxide by heating it above the melting point in the presence of excess air. Roasting is a step of the processing of certain ores.More specifically, roasting is a metallurgical process involving gas–solid reactions at elevated temperatures with the goal of purifying the metal component(s). mark as brainliest answer and follow me. 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