Choose the INCORRECT statement.
◦ Precipitation in hydrometallurgy is to precipitate the metal as an ionic solid or reduce it to the metal.
◦ Leaching for gold is done by the cyanidation process where Au(s) is complexed with cyanide ion.
◦ Electrolytic method is used to purify expensive metals.
◦ Pyrometallurgy uses low temperature to freeze out the metal from the ore.
◦ Hydrometallurgy uses water and aqueous solutions at moderate temperatures to handle materials.