Gold CIL Production Line

Process Introduction

Workflow Introduction

1. Crushing and Grinding

Coarse Crushing: Jaw Crusher crushes the raw ore to <150mm.

Fine Crushing: Cone Crusher + High Pressure Roller Mill crushes the ore to <25mm.

Ultra-fine Grinding: Closed circuit of Ball Mill and Cyclone produces a slurry with a P80=75μm (200 mesh) to ensure the full dissociation of gold.

2. Leaching and Cyanidation

At the end of the crushing and milling stage, the slurry is fed into nine high-efficiency cyanide leach tanks arranged in a stepped configuration. The first two leach tanks carry out cyanidation of the gold slurry, while the last six or seven leach tanks carry out counter-current adsorption operations (cyanidation and activated carbon addition at the same time).

3. Carbon desorption

In the step of adding activated carbon, coconut shell activated carbon (small pore size, high activity, wear-resistant and renewable) is added to the slurry. According to the characteristics of gold and silver adsorption, coconut shell activated carbon can dissolve and adsorb gold and silver ions to form gold-carrying carbon.

4.Carbon treatment

Vibrating screen and dewatering screen are the key equipments for reverse movement of slurry and carbon. The filter press and high-frequency dewatering screen researched and developed by Central Asia can effectively reduce the wear and tear of carbon on the surface of vibrating screen and in the process of continuous pumping of slurry, reduce the cost, and facilitate the maintenance and operation.

5. Desorption electrolysis

The desorption electrolysis system is to carry out high-temperature desorption and electrolysis of gold in the gold-carrying charcoal through the mix of sodium cyanide and sodium hydroxide, and after the removal of wood chips and other sundries through the washer, it is used to carry out gold desorption using high-temperature high-pressure desorption method (150 degrees Celsius, 0.5 Mpa) for the desorption of gold, 99% of the gold can be dissolved within 2-6 hours.

Process advantage

• High-efficiency integration：
  Synchronization of leaching and adsorption, shortening the process by 30% and reducing the investment by 20%+ .
• Recovery rate jumped：
  Dynamic adsorption makes the gold recovery rate break through 96% (the traditional process is only 85-90%) .
• Reducing costs and increasing efficiency：
  Cyanide consumption is reduced by 40%, and the consumption of activated carbon is <0.5kg/tonne of ore .
• The nemesis of difficult-to-process minerals：
  It has strong adaptability to high mud content and fine-grained gold ores.

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