20TPD Modular Gold CIL Plant

Core Process Principles

CIL stands for Carbon-in-Leach. The primary distinction between CIL and CIP (Carbon-in-Pulp) is that the leaching and adsorption processes are carried out simultaneously. The core workflow consists of three main steps:

• Leaching Preparation: The ore is ground to a fineness of 200 mesh to form a slurry; sodium cyanide is then added to dissolve the gold, converting it into gold cyanide complex ions.
• Simultaneous Adsorption: Activated carbon is added directly into the leaching tanks. As the gold cyanide complex ions dissolve, they are simultaneously adsorbed onto the activated carbon; the carbon and slurry flow in a counter-current direction to maximize efficiency.
• Gold Recovery: The gold-loaded carbon undergoes desorption and electrolysis, followed by smelting, to yield the final gold product; the stripped carbon is then recycled for reuse.

Core Advantages of Modular Plants

Compared to traditional, fixed-site beneficiation plants, the modular integrated design offers numerous benefits:

• Investment & Commissioning Advantages: Requires a smaller infrastructure footprint and a shorter construction cycle, resulting in lower initial capital investment. It allows for rapid project commencement and commissioning, saving over 30% of the time typically required for traditional construction methods.
• High Recovery Rates: Gold recovery rates can reach 90%–95%. This method is particularly well-suited for low-grade lode gold deposits (rock gold) with grades ranging from 2 to 5 g/ton, achieving recovery rates that are more than 10% higher than those of flotation processes.
• Strong Adaptability: Capable of processing a wide variety of complex ores—including oxidized ores, sulfide ores, arsenic-bearing sulfide gold ores, and high-clay gold ores—and remains robust and insensitive to fluctuations in ore properties.
• Low O&M Costs: Features a high degree of automation, and the modular design facilitates easy replacement of spare parts. Many components are designed to achieve energy savings of 15%–20%, resulting in significantly lower labor and operational maintenance costs.

Five Core Advantages of the Modular Solution

1. Rapid Deployment Capability: Containerized modules are pre-assembled, reducing on-site installation time by 70% (requiring only 7–10 days).

2. Intelligent Control System: A PLC-based system automatically regulates 12 key parameters, including cyanide concentration, pH levels, and oxygen content.

3. Water-Saving & Eco-Friendly Design: A closed-loop water circulation system limits water consumption to less than 3 m³ per ton of ore, achieving a wastewater reuse rate of over 95%.

4. Adaptability to Complex Ores: Capable of processing refractory gold ores—including those containing arsenic and copper—by adjusting the number of leaching stages (expandable up to 6 stages).

5. Mobile Configuration: The entire system occupies a footprint of less than 300 m², making it ideal for decentralized operations across dispersed mining sites.

Key Equipment Used in This Mobile Modular Gold CIL Plant 

• Leaching Tanks: Facilitate gold dissolution with cyanide under controlled conditions.
• Carbon & Slurry Separation Screen: Efficiently extracts gold-laden carbon for further refining.
• Roots Pump (Air Blower): Enhances leaching efficiency by aeration, improving gold dissolution.
• Chemical Pump: Precisely doses leaching agents (cyanide, lime) for optimal gold recovery.
• Slurry Pump: Transports ore slurry from grinding circuits to downstream processes.
• Mixing Tank: Ensures homogeneous blending of reagents and slurry before leaching.
• Cone Thickener: Concentrates slurry from the grinding mill, reducing water content.