US Patent Issued to Yava International on Sept. 22 for "Integrated recovery of metals from complex substrates" (Canadian Inventor)

ALEXANDRIA, Va., Sept. 24 -- United States Patent no. 12,742,224, issued on Sept. 22, was assigned to Yava International Inc. (Fonthill, Canada).

"Integrated recovery of metals from complex substrates" was invented by Madhav Dahal (Toronto).

According to the abstract* released by the U.S. Patent & Trademark Office: "Described is a method of recovering a metal from a substrate having a metal sulphide, metal oxide, or combination thereof, by contacting the substrate with an aqueous oxidant to oxidize the metal sulphide to elemental sulphur and oxidized metal or convert the complex metal oxide to a metal salt, contacting the oxidized metal or simple metal oxide with ammonium hydroxide to form soluble a ammine complex of the metal to obtain a...