1. Teknik Elektrokimia Instructor: Rama Oktavian
15/16 Semester genap
Teknik Elektrokimia
Instructor: Rama Oktavian
Office Hr.: T , Th ; 13-15, F ; 13-15

2. Teknik elektrokimia
Production of metal

3. Teknik elektrokimia
Production of metal

4. Teknik elektrokimia Production of metal Electrowinning
Electrowinning – a process where impure metals can be purified in electrolytic cells.
an electrochemical process used to reduce (win or deposit) metal cations on the surface of a cathode sheet from an aqueous solution prepared by a leaching chemical process
The cations of molten salts or aqueous solutions are reduced at the cathode to give very pure metals.
The metal is recovered by electrodeposition in the form of cathodes, which are normally rectangular shapes (plates).

5. Teknik elektrokimia Production of metal Electrowinning
When metals are made by electrolysis it is sometimes called electrowinning as the metal is won from the ion as it is reduced.

6. Teknik elektrokimia Production of metal Electrowinning
Electrowinning of a metal is based on the electrolysis of aqueous solutions or melts of metal salts with insoluble anode

7. Teknik elektrokimia
Electrowinning
Aluminum production from bauxite

8. Teknik elektrokimia Electrowinning Aluminum production from bauxite
The carbon lining, connected to a direct current, serves as the cathode. The anode consists of carbon rods dipped into the tank.
At the cathode, Al3+ ions are reduced, forming molten aluminum. At the anode, carbon is oxidized, forming carbon dioxide gas.

9. Teknik elektrokimia
Electrowinning
Aluminum production from bauxite

10. Teknik elektrokimia
Electrowinning

11. Teknik elektrokimia
Electrowinning

12. Teknik elektrokimia
Electrowinning

13. Teknik elektrokimia Electrowinning
Electrowinning production of atomic Zn, Cu, and Ni

14. Teknik elektrokimia Electrowinning
Electrowinning production of atomic Zn, Cu, and Ni

15. Teknik elektrokimia Mathematics of Electrowinning
the amount of a species that is gained or liberated on the electrode surface during the electrochemical process is directly proportional to the quantity of electric charge (Q) that passes through the aqueous electrolyte
the electric charge is

16. Teknik elektrokimia Mathematics of Electrowinning
the amount of a species is defined as the Faraday’s weight gained or liberated due to the flowing electric current during a period of time

17. Teknik elektrokimia
Mathematics of Electrowinning
Combining:

18. Teknik elektrokimia
Mathematics of Electrowinning
Solution

19. Teknik elektrokimia
Mathematics of Electrowinning
Solution

20. Teknik elektrokimia Production rate of Electrowinning process
Actual electrochemical cells do not operate at 100% efficiency

21. Teknik elektrokimia Production rate of Electrowinning process
Efficiency in electrochemical cell
Efficiency in electrochemical cell
The potential E is the sum of electrode potentials and overpotentials, including the ohmic effect

22. Teknik elektrokimia Production rate of Electrowinning process
Another definition of E
According to Ohm’s law

23. Teknik elektrokimia Production rate of Electrowinning process

24. Teknik elektrokimia
Production rate of Electrowinning process
Solution

25. Teknik elektrokimia
Production rate of Electrowinning process
Solution

26. Thank You !