CPC C22B 11/06 (2013.01) [C22B 1/005 (2013.01); C22B 11/025 (2013.01)] | 25 Claims |
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.
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