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Non-Chemical Pulp Carbon

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I saw a recent TV show 'How Do they Do It' where they used electrowinning with steel to harvest the gold that was absorbed onto carbon.

Here's a portion of the video.

http://www.youtube.com/watch?v=hl7KZFrgRVc

Steve
 
The video didn't cover the process for stripping the gold from the carbon. This is called elution and there are several different solutions that can be used. The gold is then recovered from the solution by electrowinning.

http://www.google.com/search?q=cip+process+gold+elution&sourceid=navclient-ff&ie=UTF-8&rlz=1B3GGGL_enUS259US259&aq=t
 
Chris, does boiling the carbon in caustic soda work?

I don't know but I would doubt it if it's used alone. I've never done this but have just searched the internet. There were several references that used a hot solution of caustic soda and ethylene glycol (antifreeze).
 

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