CIL (Carbon In Leach) is a gold extraction method developed from the carbon-in-pulp (CIP) process. This technology integrates activated carbon into the cyanide leaching tank, enabling simultaneous adsorption and leaching of gold, significantly improving recovery and production efficiency. An eco-friendly and compliant mineral processing solution.
Rock Gold CIL Processing IntroductionCIL (Carbon In Leach) is a gold extraction method developed from the carbon-in-pulp (CIP) process. This technology integrates activated carbon into the cyanide leaching tank, enabling simultaneous adsorption and leaching of gold, significantly improving recovery and production efficiency. An eco-friendly and compliant mineral processing solution.
Application: The gold CIL process is suitable for beneficiating oxidized gold ores with low sulfur content and high mud content, fine-grained disseminated gold ores, gold tailings after amalgamation with gravity separation, difficult-to-treat gold ores containing arsenic or carbon, low-grade gold mines, and gold with associated silver and copper content.
Processing FlowFeeding, crushing, and screening system:
Dump trucks deliver gold ore into the hopper, where it passes through a vibrating feeder to a jaw crusher. A two-stage jaw crusher crushes the ore to less than 25mm. After classification on a vibrating screen, qualified material (<25mm) is conveyed to a ball mill via a conveyor.
Grinding system: Two-stage ball mill process:
After the primary milling process, the ore is separated by a spiral classifier, and the coarse sand is returned for re-grinding. The overflow slurry enters a hydrocyclone. The cyclone underflow enters a secondary ball mill, ultimately ensuring that 90% of the ore fines reach a 200-mesh fineness, meeting leaching requirements.
Pre-Leaching Pretreatment:
The cyclone overflow slurry is screened for impurities before entering a thickener, where a flocculant is added to accelerate settling. The thickener underflow slurry is pumped into an agitator tank and then into the primary leaching tank for initial leaching.
Leaching and activated carbon adsorption:
Eight dual-impeller agitator tanks, equipped with activated carbon and Roots blowers, simultaneously perform leaching and adsorption. The number and size of the tanks can be adjusted based on the processing volume and ore characteristics.
Gold-loaded carbon desorption and electrolysis:
The gold-loaded carbon is vibrated to remove impurities. Desorption and electrolysis are then performed under normal temperature and pressure.
Tailings water treatment:
The tailings are first screened to remove activated carbon. After concentration adjustment in a thickener, they are dewatered using a plate and frame filter press. The water is recycled, and the dry tailings are transported away. If water is not recycled, bleaching powder is added to neutralize the acidic agents before discharge.
Advantages
- Wide Applicability: Suitable for all types of gold ores and tailings.
- Efficient Crushing: Two-stage jaw crusher + vibrating screen form a closed-circuit system for high crushing efficiency.
- Premature Recovery of Free Gold: quickly recover a part of liberated gold from ball mill with a gravity separation machine.
- Process Optimization: Two-stage grinding + classification ensures leaching fineness and improves subsequent recovery.
- Maximized Recovery: Gold recovery rate up to 95%.
