Question #74561
In which cases is hydrometallurgy applicable? In such cases, how are the leached out
metals recovered from solution? Explain with suitable examples.
metals recovered from solution? Explain with suitable examples.
Expert's answer
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
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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#339914 on Dec 2023
#339914 on Dec 2023