A) gravity separation
B) roasting
C) electromagnetic separation
D) all the above
Correct Answer: D
Solution :
Cassiterite or tin stone \[(Sn{{O}_{2}})\] is a heavy ore of tin, which contains wolframite \[(FeW{{O}_{4}}\cdot MnW{{O}_{4}})\] as a magnetic impurity and some other impurities of non-metals (S etc.). Hence, it is concentrated by all the 3 methods given. Impurity of sulphur is removed as volatile oxide by roasting the ore. \[S+{{O}_{2}}\xrightarrow{\Delta }S{{O}_{2}}\]
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