The document discusses methods for extracting and purifying metals from their ore, including the Hall-Heroult process which uses electrolysis to extract aluminum from molten cryolite. It also mentions leaching agents like sodium or potassium cyanide solutions being used to separate metals from ores, as well as fractional crystallization and column chromatography as purification methods.

3. ?

7. Combined state Native state

24. Also Called

33. Working-

44. filtered

45. filtered
Hall process

47. Leaching agent- Diluted solution of
NaCN or KCN in presence of air.

61. Same diagram

78. determine conditions such as the necessary temperature needed to reduce the ores
of essential metals.

98. This method use
for Cu, tin which
contain oxide
impurities.
Eg. Cu before
impurity 98% after
purity 99.5%.

99. Also called
fractional
crystallization
method

101. It undergo
decomposition to
give pure metal.

104. Column chromatography

119. Molten Al