METHOD OF GOLD EXTRACTION FROM SULFIDE AND ARSENO-SULFUR CONCENTRATES Russian patent published in 2009 - IPC C22B11/02 

FIELD: metallurgy.

SUBSTANCE: invention relates to noble metals metallurgy and can be used for selective gold extraction from gravitational and flotation concentrates of gold-extraction factories at finishing of gold-bearing products up to requirements of parting. Method of gold extraction from sulfide and arseno-sulfur concentrates into lead alloy includes loading of concentrate into alkali melt (NaOH) and lead at the temperature 400-550°. Additionally and after it is implemented intensive mechanical agitation by blade mixer of the system concentrate - alkali melt - lead melt with gold extraction by lead into lead alloy. Separation of lead alloy is implemented by means of sedimentation. At the stage of concentrate loading it is simultaneously fed industrial oxygen in amount 1.5-2.7% wt from weight of loaded concentrate at loading duration, corresponding 25-30% of extraction duration.

EFFECT: excluding of effervescence of solid-liquid system of the process.

2 ex