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Electrolytic Refining

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Question

Find the number of metals which are commercially reduced by self reduction from the given metals:
Fe, AI, Zn, Sn, Pb, Hg, Cu

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Solution

Three metals (Pb, Hg, Cu) are commercially reduced by self reduction. Note: Self reduction method is used for sulphide ores of less electropositive metals.

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Q. Find the number of metals which are commercially reduced by carbon reduction method from the given metals:
Ag, Cr, Mn, Sn, Zn, Fe

How many of the following metals are extracted by self reduction process?
$P b, A u, M g, S n, F e, A l, A g, H g, N a, Z n, C u, C a$

Q. How many metals are commercially reduced by Goldschmidt alumino-thermic process from the given metals?
Na, Pb, AI, Mn, Cr, Sn

F e_{2} O_{3}, S n O_{2}, P b S, M g C l_{2}, H g S, Z n S, A l_{2} O_{3}, A g_{2} S, C u_{2} S

Consider given ores and calculate the value of expression

(\frac{Q + R}{P \times S})

, where,
P = Number of ores from which the metal is commercially extracted by Hydrometallurgy.
Q = Number of ores from which the metal is commercially extracted by Self-reduction.
R = Number of ores from which the metal is commercially extracted by carbon reduction.
S = Number of ores from which metal is commercially extracted by electrolyitc reduction.

Q. How many metals are commercially extracted by pyrometallurgy from the given metals?
( Cu, Fe, Sn, Au, K, Na )

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