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Overview of General Metallurgical Processes

Roasting as w...

Question

Roasting as well as calcination of an ore is always doneits melting point.

A

above

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B

below

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C

at

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Solution

The correct option is B below
During roasting as well as calcination, the ore is always heated below its melting point. This is because if the ore melts, the impurities in them might get mixed, making it tough to remove them.

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Q. Roasting as well as calcination of an ore is always doneits melting point.

Q. In extractive metallurgy of zinc, partial fusion of ZnO with coke is called ______ and reduction of the ore to molten metal is called ______ (smelting, calcining, roasting, sintering).
1. Roasting; calcining
2. Roasting; smelting
3. Sintering; smelting
4. Sintering; calcining

Q. Choose the correct option for the following statements
Statement - 1: Sulphide ore is firstly converted to oxide and then it is subjected to reduction for the extraction of metal.
Statement - 2: In calcination, the ore is heated in a regular supply of air in a furnace at a temperature below melting point of the calcined product.
Statement - 3: Roasting involves heating in absence of air until volatile matter escapes.
Statement - 4: In the metallurgy of aluminium, purified

A l_{2} O_{3}

N a_{3} A l F_{6}

C a F_{2}

which increases the melting point of the mix.

Q. Differentiate between the following.
(i) Minerals and Ores
(ii) Calcination and Roasting

Q. Give the reaction involved during extraction of zinc from its ore by:

(a) roasting of zinc ore.
(b) calcination of zinc ore.

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