Overview The Carbon-In-Leach (CIL) process is a highly efficient method for extracting gold from ore by combining cyanidation and adsorption onto activated carbon in a single integrated circuit. Widely used in modern gold mining, CIL offers advantages such as high recovery rates, reduced operational costs, and environmental sustainability compared to traditional methods. Key Stages of the CIL Process 1. Ore Preparation Crushing & Grinding: Raw ore is crushed and ground into fine particles to maximize surface area for chemical reactions. Slurry Formation: The ground ore is mixed with water to form a slurry, which is fed into the CIL circuit. 2. Leaching & Cyanidation Gold Dissolution: Sodium cyanide (NaCN) is added to the slurry, dissolving gold into a liquid phase as a gold-cyanide complex (Au(CN)₂⁻). pH Adjustment: Lime (CaO) is used to maintain an alkaline environment (pH ~10–11) to optimize cyanide efficiency and minimize volatilization. 3. Adsorption onto Activated Carbon Carbon Addition: Activated carbon granules are introduced into the leaching tanks, where they adsorb the dissolved gold-cyanide complex. Counter-Current Flow: Slurry flows through a series of agitated tanks, while carbon moves in the opposite direction, maximizing gold recovery. 4. Carbon Separation & Elution Screening: Loaded carbon is separated from the slurry via screens and washed to remove residual ore. Elution (Gold Stripping): The gold is desorbed from the carbon using a hot (100–130°C) caustic-cyanide solution or the Zadra process. Electrowinning: The eluted solution is passed through an electrolytic cell, where gold is plated onto steel wool cathodes. 5. Carbon Regeneration & Smelting Carbon Reactivation: Stripped carbon is thermally regenerated (600–700°C) for reuse in the circuit. Gold Smelting: The electrowon gold sludge is dried and smelted into doré bars (typically 90–95% purity). 6. Tailings Management Detoxification: Residual cyanide in tailings is destroyed using oxidation (e.g., SO₂/air process) or natural degradation. Environmental Safeguards: Tailings are stored in lined ponds to prevent groundwater contamination. Advantages of CIL High Recovery Rates: >90% gold extraction efficiency. Lower Costs: Combines leaching and adsorption, reducing infrastructure needs. Flexibility: Effective for both free-milling and refractory ores (with pretreatment). Applications CIL is the standard for large-scale gold processing plants, particularly for ores with: Fine gold particles Low sulfide content High silver co-extraction Technical Support Our team provides end-to-end CIL plant design, optimization, and environmental compliance solutions. Contact us for a feasibility study. This draft balances technical accuracy with readability for a corporate audience. Let me know if you'd like to: Add a process flow diagram. Highlight specific equipment (e.g., leach tank designs). Include case studies/metrics from your operations. Would you also like a Chinese version for multilingual support?

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