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Gold/Mining/Energy : A New Age In Gold Refining

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To: Chuck Bleakney who wrote (513)	1/22/1998 7:19:00 PM
From: Bill Jackson	Read Replies (2) of 672

Chuck; by controlling the current density and voltage drop across the cell you can get most contaminating metals to drop to the bottom as a sludge. This sludge is then further purified(usually by specialists) and you sell the copper as first stage refined, or plate it one more time to get it purer. I suspect you would avoid the voltages that would disassociate water, as that energy is usually lost unless you sell the H2 and O2 to others. Some disassociation occurs as you up the current density to get a faster rate, and the gradient breaks some water also. In fact you must control the cell voltage with care to get the purest copper, and kep other metals from also plating over. I used to know more of this, but I have forgotten it. Any industrial book and electrorefining at a library will give you the information. It might also be webbed? From first principals you need to keep the anode and cathode close to minimize the cell resistance. The pipe idea would have all the copper streaming as an ion current quite a long way, and that makes losses. With the plates an inch or so aprt you have minimum losses and best control of EMF. Bill

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