This link provides some info on iodine leaching http://www.prospectorsparadise.com/html/leaching.html
It is rather vague...
I think the process is to get some iodine salt, add a little bleach to partially precipitate some elemental iodine which turns the solution blue, and add gold bearing materials.
The gold ladden solution is red brown, and it is filtered clean. A solution of lye is added to precipitate the gold as black powder.
The iodine is recovered by adding a lot of bleach to precipitate the iodine to be recovered for later use. Elemental iodine is converted to gold etching solution again by adding lye solution.
Does anyone have experience with iodine leaching? It seems to be an interesting way to process low grade scrap effciently. I don't know how copper or other metals will affect the process though....
It is rather vague...
I think the process is to get some iodine salt, add a little bleach to partially precipitate some elemental iodine which turns the solution blue, and add gold bearing materials.
The gold ladden solution is red brown, and it is filtered clean. A solution of lye is added to precipitate the gold as black powder.
The iodine is recovered by adding a lot of bleach to precipitate the iodine to be recovered for later use. Elemental iodine is converted to gold etching solution again by adding lye solution.
Does anyone have experience with iodine leaching? It seems to be an interesting way to process low grade scrap effciently. I don't know how copper or other metals will affect the process though....