EXTRACTION METHOD OF GOLD FROM GOLD-BEARING NATURAL RAW MATERIAL Russian patent published in 2012 - IPC C22B11/00 

FIELD: metallurgy.

SUBSTANCE: gold-bearing natural raw material is burnt in layer or cyclone units with possibility of formation of gaseous gold compounds in gaseous combustion products. Then, gaseous combustion products and solid dust particles contained in them are cooled down to 200°C with introduction of gaseous ammonia or ammonia water depending on percentage content sulphur in initial raw material. As a result of cooling process, gaseous gold compounds are condensed on solid dust particles, which are collected by dry entrapment performed in sleeve filter. Natural raw material can be pre-granulated or briquetted in order to reduce the output of solid dust particles at combustion. Besides, raw material is brought to total calorific capacity of not less than 9 MJ/kg by mixing it with liquid, gaseous or solid fuel.

EFFECT: higher gold concentration in finished products and complete gold collection is provided.

5 cl, 1 tbl