For what it's worth, I'm just passing on some information.
There have been several discussions concerning the use of porous cups to make fizzer cells for the dissolving of gold in HCl to produce gold chloride solution. This is a common method for making the electrolyte for Wohlwill cells. It can also be used as a refining method to dissolve gold, without using aqua regia. In the past, the only porous cups I have seen were the very small ones made by Coors. I always assumed that someone made larger ones but, until now, I have never run across them.
This company makes what they call "porous pots" for the control of impurities in chrome plating baths. They make standard sizes and it seems they can make custom sizes and shapes. The largest standard size is 3" x 12" x 24" and costs about $400, whech doesn't seem too expensive to me. The link shows the replacement pots, themselves, at the bottom of the page.
http://www.hard-chromesystems.com/Catalog2000-10.htm
Here's their patent. It seems that the electode in the porous pot is cathodic and is located in a separate tank. The solution is circulated from the main tank directly into the pot.
http://www.google.com/patents?id=7G8DAAAAEBAJ&printsec=abstract&zoom=4&source=gbs_overview_r&cad=0#v=onepage&q&f=false
I can think of some neat applications for these large pots. I have no idea if the material of construction is usable for strong acid operations, but I assume it is. They do make a special pot for the use of fluoride solutions.
There have been several discussions concerning the use of porous cups to make fizzer cells for the dissolving of gold in HCl to produce gold chloride solution. This is a common method for making the electrolyte for Wohlwill cells. It can also be used as a refining method to dissolve gold, without using aqua regia. In the past, the only porous cups I have seen were the very small ones made by Coors. I always assumed that someone made larger ones but, until now, I have never run across them.
This company makes what they call "porous pots" for the control of impurities in chrome plating baths. They make standard sizes and it seems they can make custom sizes and shapes. The largest standard size is 3" x 12" x 24" and costs about $400, whech doesn't seem too expensive to me. The link shows the replacement pots, themselves, at the bottom of the page.
http://www.hard-chromesystems.com/Catalog2000-10.htm
Here's their patent. It seems that the electode in the porous pot is cathodic and is located in a separate tank. The solution is circulated from the main tank directly into the pot.
http://www.google.com/patents?id=7G8DAAAAEBAJ&printsec=abstract&zoom=4&source=gbs_overview_r&cad=0#v=onepage&q&f=false
I can think of some neat applications for these large pots. I have no idea if the material of construction is usable for strong acid operations, but I assume it is. They do make a special pot for the use of fluoride solutions.
