What happens to the mass of anode during electrorefining?
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The copper anode contains many soluble and insoluble impurities. During the electrorefining insoluble anode impurities, amounting about 3 to 5 kg/tonne of anode, fall to the bottom of the cell as slimes, which contain Cu, Ni, Se, Te, Ag, Au, platinum group metals (PGM) along with some amount of Fe, Pb, Ba, etc.
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The anode is a reducing agent because its behaviour will reduce ions at the cathode. Mass decreases as the reacting anode material becomes aqueous
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