The gold recovery method according to the present invention includes a first step of preparing a first solution by leaching pulverized waste scrap with a first aqua regia; a second step of precipitating gold by adding zinc powder to the first solution; a third step of preparing a second ...
The polyurethane-containing material may be chosen from the group consisting of foam trimmings, foam buns and foam skin, changeover blocks, off-specification material, polyurethane powder, molding mushrooms, fabrication scrap and post-... Robert Donald Villwock,Bryan Louis Martel - US ...
METHOD OF RECOVERING GOLD FROM NON-METALLIC FRACTION OF ELECTRONIC SCRAPBEDNAREK ANDRZEJCIOSEK JANSTASIAK ROLANDWOJCIK STANISLAWBEDNAREK PIOTROKON LESLAWBRZEZINA EUGENIUSZZAKRZEWSKI JERZYBARSZCZ JERZYPRAJSNAR RYSZARD
A method of recovering gold and nickel from scrap and electronic waste materials, and particularly from rejected and utilized integrated circuits encapsulated with the use of epoxy materials, including leaching in a solution of the sulphuric acid in the presence of an oxidant, and further dissolving...
METHOD OF RECOVERING GOLD FROM NON-METALLIC FRACTION OF ELECTRONIC SCRAPBEDNAREK ANDRZEJCIOSEK JANSTASIAK ROLANDWOJCIK STANISLAWBEDNAREK PIOTROKON LESLAWBRZEZINA EUGENIUSZZAKRZEWSKI JERZYBARSZCZ JERZYPRAJSNAR RYSZARD
The present invention relates to a method for recovering copper and gold from waste printed circuit board scrap, comprising: a waste printed circuit board scrap cutting step (S100); a chlorine solution supplying step (S200); a copper leaching step (S300); and a gold recovering step (S400). ...