公开(公告)号：US11718893B2

公开(公告)日：2023-08-08

申请号：US16759751

申请日：2018-11-01

Applicant: YEDA RESEARCH AND DEVELOPMENT CO. LTD.

Inventor： Igor Lubomirsky ,  Valery Kaplan ,  Nurlan Dosmukhamedov ,  Erzhan Zholdasbay

IPC: C22B11/06 ,  C22B1/00 ,  C22B11/02

CPC classification number: C22B11/06 ,  C22B1/005 ,  C22B11/025

Abstract: A method for recovery of gold from gold-containing materials, such as electronic waste material, minerals and sands is described. The method includes crushing the gold containing material to obtain a particulate material. The particulate material is then preheated in an oxygen-containing gas environment in a preheating zone. The method also includes mixing the oxidized particulate material with a chlorine-containing material and treating the mixture in a reaction zone. The treatment is carried out by heating the mixture to provide thermal decomposition of the chlorine-containing material and produce a chlorine-containing gas mixture, and by applying an electromagnetic field to the chlorine-containing gas mixture to provide ionization of chlorine. A volatile gold-containing chloride product, produced in the reaction zone as a result of a chemical reaction between gold and chlorine ions, is then cooled to convert the volatile gold-containing chloride product into solid phase gold-containing materials.