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 Electrorefining
An electrochemical technique suitable for refining metals produced by electrowinning or smelter.
The anode is the impure metal

3. Teknik elektrokimia
Electrorefining
a piece of impure metal is made the anode of the cell. It is oxidized to the cation and then reduced to the pure metal at the cathode.
Electrorefining technique is used to obtain ultrapure silver, lead and copper.

4. Teknik elektrokimia
Electrorefining
Impure metal is oxidized at the anode and pure metal is reduced at the cathode.

5. Teknik elektrokimia
Electrorefining

6. Teknik elektrokimia
Aqueous Electrorefining
aqueous processes presently predominate due to their ease of handling, more developed chemistry and familiarity with aqueous process liquors and electrolytes

7. Teknik elektrokimia
Aqueous Electrorefining

8. Teknik elektrokimia
Electrorefining of copper

9. Teknik elektrokimia
Electrorefining of copper
Main reaction

10. Teknik elektrokimia Electrorefining of copper
Metal distribution during electrorefining

11. Teknik elektrokimia Electrorefining of copper
Metal distribution during electrorefining

12. Teknik elektrokimia
Electrorefining of copper

13. Teknik elektrokimia
Electrorefining of copper
Electrolyte composition

14. Teknik elektrokimia
Electrorefining of copper
Operating condition

15. Teknik elektrokimia Electrorefining of copper Refining of electrolyte
removing copper, As and Sb by cathodic deposition in separate electrochemical cells with insoluble anodes
the neutralization of the free sulfuric acid by dissolving copper
the electrolyte is freed from Cu, As and Sb by electrolysis in a separate cell and from Ni, Zn and Fe by evaporation

16. Teknik elektrokimia Electrorefining of copper
Processing of anodic slime
Copper is removed from the anodic slime by dissolution in hot dilute sulfuric acid with air circulation
Silver of % purity is extracted from the alloy by the process of anodic dissolution in a solution of silver nitrate

17. Teknik elektrokimia Electrolytic preparation of inorganic compound
Fluorine (F)
Halogen family that has atomic number 9
an extremely reactive element and reacts with itself to form Fluorine Gas
the 13th most abundant element by weight

18. Teknik elektrokimia Electrolytic preparation of inorganic compound
Fluorine (F)
Fluorine is found in earth’s crust in different forms:
Fluorspar or Fluorite (CaF2)
Fluoroapatite [3(Ca3 (PO4)2.CaF2)]
Cryolite (Na3AlF6)

19. Teknik elektrokimia Electrolytic preparation of inorganic compound
Uses of Fluorine (F)
required for the preparation of uranium(VI) fluoride
used for manufacture of chlorofluorocarbons (CFCs) which are used as refrigerant, aerosol propellants and foaming agent in polymers
Fluoroalkene an important compound of Fluorine on polymerization gives Teflon

20. Teknik elektrokimia Electrolytic preparation of inorganic compound
Production of Fluorine (F)
Electrolysis is the only method for the isolation of the element fluorine
Overall reaction:

21. Teknik elektrokimia Electrolytic preparation of inorganic compound
Production of Fluorine (F)
Electrolysis is the only method for the isolation of the element fluorine

22. Teknik elektrokimia Electrolytic preparation of inorganic compound
Production of Fluorine (F)

23. Teknik elektrokimia Electrolytic preparation of inorganic compound
Production of Fluorine (F)

24. Teknik elektrokimia Electrolytic preparation of inorganic compound
Production of Fluorine (F)

25. Thank You !