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Roasting

Roasting is u...

Question

Roasting is used to process which of the following ores?

A

Oxide ores

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B

Silicate ores

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C

Sulphide ores

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D

Carbonate ores

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Solution

The correct option is C
Sulphide ores

Roasting:The process of heating the ores strongly in presence of oxygen, during which Sulfide is converted to an oxide and sulfur is released as sulfur dioxide a gas.

$2 C u_{2} S + 3 O_{2} \to 2 C u_{2} O + 2 S O_{2}$

$2 Z n S + 3 O_{2} \to 2 Z n O + 2 S O_{2}$

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Q. Which of the following factors in of no significance for roasting sulphide ores to oxides & not subjecting the sulphide ores to carbon reduction directly?

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. A sulphide ore is converted into metal oxide by the process of:
(a) carbonation
(b) roasting
(c) calcination
(d) anodising

Q. Assertion :Roasting is a process in which the ore is heated strongly in absence of air. Reason: Concentration of sulphide ore is done by calcination.

Q. Sulphide ores partially oxidized during roasting in the extraction of copper are :

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