Electrowinning is different from the anode of the electrolysis is not the same, the electrolysis is soluble anode, which is a crude metal (e.g., crude copper) made, when energized electrolysis, the anode is gradually dissolved. The electrowinning is an insoluble anode. When the electrolysis is performed, the anode is not dissolved, but the metal to be extracted in the electrolyte is deposited on the cathode, so that the purpose of extracting the metal can be achieved.
For example, the copper sulfate solution is placed in an electrolytic cell, and the anode is made of an insoluble anode of an alloy. When an electric current is applied between the electrodes, the following reactions occur at the two poles:
1
At the anode H 2 O - 2e —→ 2H + + —O 2 ↑
2
At the cathode Cu2+ + 2e —→ Cu↓
1
The total reaction formula is CuSO 4 +H 2 O —→ Cu↓ + H 2 SO 4 + —O 2
2
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