Chemistry - Metallurgy Question with Solution | TestHub

Extraction Of Tin From Cassiterite :

Cassiterite $\left({\mathrm{SnO}}_2\right)+$ Major impurities [(i) ${\mathrm{SiO}}_2$, (ii) Sulphides of $\mathrm{Fe}\&\mathrm{Cu}$, (iii) ${\mathrm{FeWO}}_4+{\mathrm{MnWO}}_4$ ]

(i) Crushing And Concentration :

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(ii) Electromagnetic Separation : remove magnetic impurity of Wolframite

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(iii) Roasting : The impurities of pyrites of copper and iron are converted into their respective oxides and sulphates.

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(iv) Leaching : + Washing : Sulphates of copper and iron are dissolved in water, washed off

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(vi) Carbon Reduction Method(Smelting) : 1500K in a reverberatory furnace ${\mathrm{SnO}}_2+\mathrm{C}\to \mathrm{SnO}+\mathrm{CO}$

${\mathrm{SnO}}_2+{\mathrm{SiO}}_2\to {\mathrm{SnSiO}}_3;\mathrm{CaO}+{\mathrm{SiO}}_2\to {\mathrm{CaSiO}}_3$ ${\mathrm{SnSiO}}_3+\mathrm{CaO}+\mathrm{C}\to \mathrm{Sn}+{\mathrm{CaSiO}}_3+\mathrm{CO}$

Hence A, C, D steps involved in tin metal extraction.