CIL Gold Beneficiation Process

A. Raw materials preparation:
Raw ores are sent to primary crusher by vibrating feeder, the crushed ores will be send to vibrating screen for separating. Under screen ores will be sent to powder silo. Upper screen ores will be returned back to second crusher by belt conveyor for re-crushing. It is named two step one closed circle crushing work flow.
Raw material from powder silo will be sent to ball mill by feeder and belt conveyor, ball mill discharges to spiral classifier, bigger size will be returned back for re-grinding. Overflow will be pumped to hydro cyclone by slurry pump for second classifier: bigger size will be returned to ball mill for re-grinding. It is named one step two closed circle grinding flow chart. Overflow from hydro cyclone will be sent to trash screen and thickener.
B. Leaching and adsorption:
The slurry will enter into 8 sets of double impeller leaching tank; well-mixed sodium cyanide agents are added to the first tank; active carbon is added to the tanks from the second to the eighth; active carbon from the second agitator is lifted to carbon screen to get gold-loaded carbon, and after cleaning, the gold-loaded carbon enters into the desorption&electrolysis system; while the slurry left goes back to the second tank; active carbon is lifted by air lifter from the tank next to the tank before against the current; the tailing goes through safety screen to recycle fine-size gold-loaded carbon, and then goes to tail water treatment stage.
C. Tail water treatment:
The tailings are lifted to the filter press, and the filter cake is so called tailings, which are transported by belt conveyor and truck to the yard, while filter liquor goes to circulating water tank for recycling, which helps save the lime and sodium cyanide.
D. Gold-loaded carbon treatment:
The gold-loaded carbon is processed by Desorption&Electrolysis equipment in batches to get gold-dust. The gold-dust goes to gold melting furnace and turns to gold bar. The gold-loaded carbon after Electrolysis process could return to last stage in the flow chart for reprocessing.