US 11,718,893 B2
Method for gold recovery and extraction from electronic waste or gold containing minerals, ores and sands
Igor Lubomirsky, Petach-Tikva (IL); Valery Kaplan, Rehovot (IL); Nurlan Dosmukhamedov, Rehovot (IL); and Erzhan Zholdasbay, Rehovot (IL)
Assigned to YEDA RESEARCH AND DEVELOPMENT CO. LTD., Rehovot (IL)
Appl. No. 16/759,751
Filed by YEDA RESEARCH AND DEVELOPMENT CO. LTD., Rehovot (IL)
PCT Filed Nov. 1, 2018, PCT No. PCT/IL2018/051167
§ 371(c)(1), (2) Date Apr. 28, 2020,
PCT Pub. No. WO2019/087193, PCT Pub. Date May 9, 2019.
Claims priority of provisional application 62/579,895, filed on Nov. 1, 2017.
Prior Publication US 2020/0332391 A1, Oct. 22, 2020
Int. Cl. C22B 11/06 (2006.01); C22B 1/00 (2006.01); C22B 11/02 (2006.01)
CPC C22B 11/06 (2013.01) [C22B 1/005 (2013.01); C22B 11/025 (2013.01)] 25 Claims
OG exemplary drawing
 
1. A method for recovery of gold from gold-containing material, the method comprising:
crushing said gold-containing material to obtain a gold-containing particulate material including particles having a predetermined grain size;
optionally subliming other metals from said material;
preheating said gold-containing particulate material in an oxygen-containing gas environment in a preheating zone to oxidize gold-containing particulate material;
mixing the oxidized gold-containing particulate material with a composition comprising chlorine-containing material and nano silica;
treating the mixture of the oxidized gold-containing particulate material with a chlorine-containing material in a reaction zone by (i) heating said mixture to provide thermal decomposition of the chlorine-containing material and produce a chlorine-containing gas mixture, (ii) applying an electromagnetic field to the chlorine-containing gas mixture to provide ionization of chlorine; thereby causing a chemical reaction between gold and chlorine ions and providing a volatile gold-containing chloride product in the reaction zone; and
cooling said volatile gold-containing chloride product to convert said volatile gold-containing chloride product into solid phase gold-containing materials.