MetallurgyMedium
Question
Which is not correct statement ?
Options
A.Cassiterite, chromite and haematite are concentrated by hydraulic washing (Tabling).
B.Pure Al2O3 is obtained from the bauxite ore by leaching in the Bayer′s process.
C.Sulphide ore is concentrated by calcination method.
D.Roasting can convert sulphide into oxide or sulphate and part of sulphide may also act as a reducing agent.
Solution
Sulphide ore is roasted in presence of excess of air or O2 below its melting point to convert into the oxide and to remove the impurities of S, P, Sb etc., as their volatile oxides. In some cases roasting of certain sulphide ores provide directly the metals.
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