ctgoldbuyer said:
Looking for a HBS co. or similar 100oz per day electrowinning cell for silver. Also, any resin system that will remove copper and other base metals from solutions.
Reply here and send images if available.
Thank You,
Joe
When I used to design and setup plating facilities in L.A., I usually used HBS tanks, rectifiers, etc. because they were high quality but were less expensive than those of their competitors. I do remember that they sold a silver cell (a Moebius cell, if I recall), but I don't remember them making an electrowinning tank. I think HBS's name is now:
http://gggtech.com/
An electrowinning cell uses inert anodes and plates out (on the cathodes) the silver already dissolved in the solution from a previous process. The solution is usually re-circulated through the cell from a solution reservoir.
A Thum (horizontal electrodes ) or Moebius (vertical electrodes) silver cell uses impure silver anodes which electrolytically dissolve into the solution. Pure silver is simultaneously deposited on the cathode(s). In this case, the solution is made up to certain specs and only in the quantity needed to fill the cell (usually). Silver cells are electrorefining cells, not electrowinning cells,
Which type cell do you want, electrowinning or electrorefining? In any case, it would probably be less expensive to build your own, unless you can find a cheap used one, which is doubtful.
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Sort of off the subject but here's an interesting silver cell with a rotating cathode. Very similar to an electrolytic photo fixer tank (which probably could be adapted for use as a silver cell). I see no need for the membrane in this case - to me, it severely complicates a fairly simple arrangement. Of course, the anodes would have to be bagged, either individually or a large cloth on a framework might be used (like the membrane is pictured). There is more info on regular Ag cells starting on p.238, along with a fairly decent Thum cell diagram.
https://books.google.com/books?id=AnL7CAAAQBAJ&pg=PA243&dq=Fig+4.14+intitle:Industrial+intitle:Electrochemistry+inauthor:walsh&hl=en&sa=X&ved=0ahUKEwjp5Lj8s-PKAhUM8CYKHe0RDXgQ6AEIJjAA#v=onepage&q=Fig%204.14%20intitle%3AIndustrial%20intitle%3AElectrochemistry%20inauthor%3Awalsh&f=false