Question

explain leaching during aluminium extraction​

Answer 1

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Leaching : It involves the treatment of the ore with a suitable reagent as to make it soluble while impurities remain insoluble. The ore is recovered from the solution by suitable chemical method. For example, the chief ore of aluminium, bauxite (Al2O3. ... Alumina dissolves forming soluble sodium aluminate.

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Answer 2

Answer:

Leaching is the chemical method used for the concentration of ores.

aluminium is generally extracted from bauxite ore,this ore contains SiO2 ,iron oxides and titanium oxide as impurities. it is concentrated by digesting the powdered ore with a concentrated solution of NaOH at 473-523 K and 35-36 bar pressure when Al2O3 gets leached out as sodium aluminte.The impurites are left behind.