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Electrolysis in industries

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Electrolysis in industries

  1. 1. 4S4 08 July 2010 Electrolysis in industries Purification of metals Electroplating of metals Extraction of metals
  2. 2. Learning outcomes At the end of the lesson, you should able to: • state uses of electrolysis in industries, • explain the extraction, purification and electroplating of metals involving electrolysis in industries, • write chemical equations to represent the electrolysis process in industries, • justify uses of electrolysis in industries, • describe the problem of pollution from electrolysis in industry.
  3. 3. 200 million yen ($1817,355)
  4. 4. Pure copper
  5. 5. Purification Of Copper
  6. 6. Electroplating of metals
  7. 7. References-Video clip • Gold, Silver & Chrome Plating Before & After Pics. http://www.youtube.com/watch?v=GQS4Tg9 2WmM&feature=related
  8. 8. Electroplating of metals
  9. 9. Cu → Cu2+ + 2e- Cu2+ + 2e- → Cu
  10. 10. Tin Can Sn • Expensive • Very thin coating (<0.0005 mm thick)
  11. 11. Extraction of metals • Reactive metals : Al, Mg, Na • Extracted from ores by electrolysis • Electrolysis of Molten compounds / concentrated solutions o salts / hydroxide solutions • Cathode: Metals formed
  12. 12. Extraction of ALUMINIUM • Extracted from ores, ALUMINIUM OXIDE, Al2O3 • Electrolyte: Molten aluminium oxide, Al2O3 • + CRYOLITE, Na3AlF6 (to Lower the melting point) • Cathode: Aluminium, Al Metals formed
  13. 13. Extraction of aluminium
  14. 14. Uses of ALUMINIUM • kitchen utensils, • exterior decorations • thousands of industrial applications • ALLOYS OF ALUMINUM • = Duranium (Al+Cu+Mg+Mn) -used in aircraft, bullet train.
  15. 15. Recycling ALUMINIUM • Saves 91 % energy • From extraction of Al from bauxite
  16. 16. Effects of the uses of electrolysis in industries • Pollution • Poisonous heavy metal ions , cyanide ions • Eg.: aluminum, arsenic, cadmium, lead, and mercury,… • Effects? Nervous system • Waste chemicals – alter pH of water resources

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