In the process of metallurgy, the ores used are first crushed and powdered, and then concentrated by various methods. Following the concentration, the metal is now extracted from the ore. To achieve this, the ore is first converted into a compound which is easy to reduce. This is achieved by various methods including calcination. Calcination is a process of converting an ore into its metal oxide, by heating the ore in limited supply or absence of air, at a temperature which is just below its melting point. In this process, the moisture is removed, the volatile impurities get expelled, and the carbonate ores are converted into oxide ores since they are easy to reduce.

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Heating a mixture of $C u_{2} O$ and $C u_{2} S$ will give

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Important Questions on General Principles and Processes of Isolation of Elements (Metallurgy)

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Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Elements (Metallurgy)>Extraction of Crude Metals from Concentrated Ores

Define roasting of ores. For what type of ores is it used?

MEDIUM

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Elements (Metallurgy)>Extraction of Crude Metals from Concentrated Ores

Giving examples, differentiate between roasting and calcination.

HARD

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Elements (Metallurgy)>Extraction of Crude Metals from Concentrated Ores

What is a Furnace? Draw reverberatory furnace and label its parts.

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Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Elements (Metallurgy)>Extraction of Crude Metals from Concentrated Ores

In the isolation of metals, calcination process usually results in:

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Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Elements (Metallurgy)>Extraction of Crude Metals from Concentrated Ores

The pair that does not require calcination is

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Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Elements (Metallurgy)>Extraction of Crude Metals from Concentrated Ores

Extraction of gold and silver involves leaching with

C N^{-}

ion. Silver or gold is later recovered by:

HARD

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Elements (Metallurgy)>Extraction of Crude Metals from Concentrated Ores

The carbon-based reduction method is NOT used for the extraction of

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Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Elements (Metallurgy)>Extraction of Crude Metals from Concentrated Ores

The idea of froth flotation method came from a person

X

and this method is related to the process

Y

of ores.

X a n d Y,

respectivity, are:

HARD

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Elements (Metallurgy)>Extraction of Crude Metals from Concentrated Ores

Differentiate between 'Roasting' and 'Calcination'

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Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Elements (Metallurgy)>Extraction of Crude Metals from Concentrated Ores

The process that involves the removal of sulphur from the ores is :

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Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Elements (Metallurgy)>Extraction of Crude Metals from Concentrated Ores

Which one of the following ores is best concentrated by froth flotation method?

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Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Elements (Metallurgy)>Extraction of Crude Metals from Concentrated Ores

Sulphide ore on roasting gives a gas

X

X

reacts with

{Cl}_{2}

in the presence of activated charcoal to give

Y

Y

is :

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Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Elements (Metallurgy)>Extraction of Crude Metals from Concentrated Ores

Extraction of copper by smelting uses silica as an additive to remove.

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Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Elements (Metallurgy)>Extraction of Crude Metals from Concentrated Ores

Match items of column-I with the items of column-II and assign the correct code:

	Column I		Column II
$(a)$	Cyanide process	$(i)$	Ultrapure $Ge$
$(b)$	Froth floatation process	$(ii)$	Dressing of $ZnS$
$(c)$	Electrolytic reduction	$(iii)$	Extraction of $Al$
$(d)$	Zone refining	$(iv)$	Extraction of $Au$
		$(v)$	Purification of $Ni$