Answer to Question #74561 in Inorganic Chemistry for srikant behera

Question #74561
In which cases is hydrometallurgy applicable? In such cases, how are the leached out
metals recovered from solution? Explain with suitable examples.
1
Expert's answer
2018-03-15T09:04:05-0400
Hydrometallurgy is used in cases where the ore you want to extract can go into a soluble form. For example, bauxite containing aluminum can be washed with alkalis

Al2O3 + 6NaOH + 3H2O = 2Na3Al(OH)6

The solution is then acidified and the alumina

2Na3Al (OH) 6 + 6HCl = 6NaCl + Al2O3 + 6H2O
The alumina is then dissolved in cryolite (Na3AlF6) and electrolysis of the melt is carried out

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