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Distillation and Liquation

Metallurgical...

Question

Metallurgical process of zinc involves roasting of zinc sulphide followed by reduction. Metallic zinc distills over as it is volatile and impurities like Cu, Pd and Fe gets condensed. The crude metal obtained is called spelter, which may be purified by:

A

electrolysis process

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B

fractional distillation

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C

polling

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D

heating with iodine

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Solution

The correct options are
A fractional distillation
D electrolysis process
Spelter Zn is purified by both distillation and electro fining process(here we get more pure Zn).

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Reduction to free metal: some of the methods commonly used to get free metal from the concentrates ore are below.

Smelting: The process of extracting a metal in the state of fusions is called smelting. In this process, the ore is mixed with carbon and heated in a suitable furnace

Electrolytic reduction process: This process is used in the extraction of the alkali and alkaline earth metals, zinc and aluminium.

Self-reduction process: The sulphide ores of less electropositive metals like Hg, Pb, Cu etc., are heated in the air so as to convert part of the ore into oxide or sulphate which then reacts with the remaining sulphide ore to give the metal.

In the metallurgical extraction of zinc from ZnO, the reducing agent used is :

Q. In the conversion of a zinc ore to zinc metal, the process of roasting involves:

Reduction to free metal: some of the methods commonly used to get free metal from the concentrates ore are below.

Smelting: The process of extracting a metal in the state of fusions is called smelting. In this process the ore is mixed with carbon and heated in suitable furnace

Electrolytic reduction process: This process is used in the extraction of the alkali and alkaline earth metals, zinc and aluminium.

Self reduction process: The sulphide ores of less electropositive metals like Hg, Pb, Cu etc., are heated in air so asto convert part of the ore into oxide or sulphate which then reacts with the remaining sulphide ore to give the metal.

After partial roasting, the sulphide of copper is reduced by :

Q. The volatile impurities associated with zinc spelter are _______ .

Q. STATEMENT-1: Extraction of zinc from sphalerite ore involves the roasting followed by reduction with coke.
STATEMENT-2 : Zinc can be commercially extracted by hydrometallurgy.

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