CIL process is mainly include : decontaminate , concentrate before leaching , leaching and adsorption , desorption and electrowinning , hydrometallurgy , regeneration of activated carbon ， tailings filting , waste water treatement and so on .
1、Decontaminate impurity ：remove the impurity like the bits of mood before cyanide adsorption , avoid the bits of mood adsorb the gold from slurry , avoid the bits of mood block the carbon separator .
2、Concentrate before leaching , usually to reach a suitable leaching concentrate , the slurry should be dewatered through the thickener before leaching , the concentration could influence the leaching time and influence the float of activated carbon .
3、Leaching and adsorption : put the slurry after decontaminated and concentrated into the high-efficiency leaching tank , there are 5-8 tanks normally , add cyanide solution into the former two tanks , add activated carbon into the other five tanks , activated carbon adsorb gold become the loaded gold carbon , the loaded gold carbon lift into the lifting screen by air lifter , the lifting screen separate activated carbon and slurry .
4、Desorption and electrowinning : the desorption of activated carbon and electrowinning the liquid gold are completed in a closed system ， in a high temperature and high pressure , activated gold carbon after desorption and electrowinning become gold pulp and barren carbon . Main equipment including : desorption column , acide tank , heater , filter , desorption tank , electrowinning tank and so on .
5、Smelting : after acide washing and decontaminate , gold ingot will be smelted . With the method of hydrometallurgy , the gold grade could be 99.99%.
6、Application of the regenerated activated carbon : the activated carbon after desorption make acide washing to remove the carbonate accumulate , after times of using that need heating activated to regenerate the carbon , then for recycling . Main equipment including activated carbon regenerated tank , water quench tank , fine carbon separate screen .