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Extraction of Aluminium

During the el...

Question

During the electrolytic extraction of aluminium, purified alumina is mixed with $N a_{3} A l F_{6}$ and $C a F_{2}$ . Why?

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Solution

In the metallurgy of aluminium, purified alumina is mixed with $N a_{3} A l F_{6}$ and $C a F_{2}$ . Cryolite $N a_{3} A l F_{6}$ helps to dissolve alumina and lowers the melting point of this mix to about 1050 $^{0} C$ . Alumina melts at about 2100 $^{0} C$ . $C a F_{2}$ is added to enhance the conductivity.

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During the electrolytic extraction of Aluminium, purified alumina is mixed with $N a_{3}$ $A l F_{6}$ and $C a F_{2}$ . Why?

Q. Assertion :In the metallurgy of aluminium, purified

A l_{2} O_{3}

N a_{3} A l F_{6}

C a F_{2}

N a A l F_{6}

C a F_{2}

lowers the melting point of mixture and increases its conductivity.

Q. In the extraction of aluminium by Hall-Heroult process, purified

A l_{2} O_{3}

C a F_{2}

Q. The major role of fluorspar

(C a F_{2})

which is added in small quantities in the electrolytic reduction of alumina dissolved in fused cryolite

(N a_{3} A l F_{6})

Q. (i) Name the solution used to react with Bauxite as a first step in obtaining pure aluminium oxide, in the Baeyer's process.
(ii) Write the equation for the reaction where the aluminium oxide for the electrolytic extraction of aluminium is obtained by heating aluminium hydroxide.
(iii) Name the compound added to pure alumina to lower the fusion temperature during the electrolytic reduction of alumina.
(iv) Write the equation for the reaction that occurs at the cathode during the extraction of aluminium by electrolysis.
(v) Explain why it is preferable to use a number of graphite electrodes as anode instead of a single electrode, during the above electrolysis.

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Extraction of Aluminium

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