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Why roasting of FeS is done?

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Why roasting of FeS is done?

(a) Removal of arsenic

(b) Recovery of H2S

(c) Immune to poisons

(d) Recovery of SO2

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This interesting question is from Inorganic Chemical in portion Inorganic Chemical Industries of Chemical Technology

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The correct answer is (d) Recovery of SO2

Best explanation: Roasting of FeS is done in Finnish process to recovery of SO2 from pyrrhotite. Removal of arsenic is done in order to protect vanadium by contacting molten sulfur with milk of lime in a continuous autoclave.

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