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Concentration of Aluminium Ore

It is given t...

Question

It is given that Bayer's process is employed. Which of the following steps are observed in this process?

A

Concentration of ore

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B

Conversion of ore into its oxide form

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C

Reduction of metal oxide to metal

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D

Refining of metal

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Solution

The correct options are
A
Concentration of ore

B
Conversion of ore into its oxide form

The chemical formula of bauxite is $A l_{2} O_{3} .2 H_{2} O$ . Bayer's process is used for the concentration of bauxite or oxide ores of aluminium using sodium hydroxide $N a O H$ . The final product obtained from the Bayer's process is relatively pure, concentrated alumina( $A l_{2} O_{3}$ ).

This means that the metal oxide is not yet converted into aluminium. Also, there is no refining step either.

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Q. (a) Name two metals which are found in free state in nature.
(b) What chemical process is used for extracting a metal from its oxide ore? Name one metal which is extracted by this method.
(c) Describe the extraction of zinc metal from its sulphide ore as well as its carbonate ore. Write equations of all the reactions involved.

Name:

(a) the processes involved in

(i) concentration (ii) refining of ores.

(b) two metallic oxides which cannot be reduced by carbon, carbon monoxide or hydrogen.

Q. Choose the correct sequence for extraction of metal from its ore
i) Concentration of ore.
ii) Reduction of metallic oxides
iii) Conversion of the ore into its oxide
iv) Refining of impure metal

Arrange the following general metallurgical processes in their proper order.

(a) Reduction of ore

(b) Concentration of ore

(c) Conversion of ore to oxide

(d) Dressing of ore

(e) Refining of ore

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.

The metal extracted by electrolysis of its fused salt is :

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