Invention Grant
- Patent Title: Method for gold recovery and extraction from electronic waste or gold containing minerals, ores and sands
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Application No.: US16759751Application Date: 2018-11-01
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Publication No.: US11718893B2Publication Date: 2023-08-08
- Inventor: Igor Lubomirsky , Valery Kaplan , Nurlan Dosmukhamedov , Erzhan Zholdasbay
- Applicant: YEDA RESEARCH AND DEVELOPMENT CO. LTD.
- Applicant Address: IL Rehovot
- Assignee: YEDA RESEARCH AND DEVELOPMENT CO. LTD.
- Current Assignee: YEDA RESEARCH AND DEVELOPMENT CO. LTD.
- Current Assignee Address: IL Rehovot
- Agency: Pearl Cohen Zedek Latzer Baratz LLP
- Agent Mark S. Cohen
- International Application: PCT/IL2018/051167 2018.11.01
- International Announcement: WO2019/087193A 2019.05.09
- Date entered country: 2020-04-28
- Main IPC: C22B11/06
- IPC: C22B11/06 ; C22B1/00 ; C22B11/02

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.
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