Case

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1200 TPD Gold Processing Plant in East Africa (Kenya, Tanzania, Sudan)

Raw Ore: Mixed Oxide and Sulfide Gold Ore

Gold Grade: 3.5 g/t

Gold Recovery Rate: 92%

Capacity: 1200 tons per day

Work Scope: Engineering Design, Equipment Supply, and Installation Guidance

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Crushing Section:

Two-stage crushing circuit: Primary crushing with a jaw crusher to reduce ore to below 200 mm, followed by a cone crusher for secondary crushing to obtain a product size of 25 mm below.
Vibrating screen for closed-circuit crushing to ensure controlled feed size for the grinding mill.

Gravity Concentration (Optional Pre-concentration):

A centrifugal concentrator is installed to recover coarse free gold from the ball mill discharge, improving overall recovery and reducing downstream processing load.

Gold Desorption & Refining:

Gold-loaded carbon is transferred to the elution column where high-temperature and high-pressure solution strips the gold from the carbon.
The rich eluate is then sent to the electrowinning system to deposit gold onto steel wool cathodes.
The gold-loaded cathodes are smelted in a furnace to produce gold doré bars.

Auxiliary & Control System:

A complete reagent preparation and dosing system.
A PLC-based central control system is provided for monitoring and optimizing the entire process, ensuring stable operation and ease of management.

Grinding & Classification Section:

A closed-circuit grinding system with a ball mill as the core component.
The ball mill grinds the crushed ore with water to form a slurry.
A spiral classifier is equipped to separate the ground slurry; oversized particles are returned to the ball mill for further grinding, while the overflow (target product) achieves a fine particle size of 74㎛ and D80.

Leaching & Adsorption (CIL System):

The fine slurry flows into a series of Leaching and Adsorption tanks (Carbon-in-Leach, CIL).
Sodium cyanide is added to dissolve the gold.
Activated carbon is introduced to adsorb the dissolved gold from the slurry.
The leaching and adsorption process is designed with a total retention time of over 20 hours to ensure high gold recovery.

Tailing Management & Water Recycling:

The barren slurry from the CIL circuit is pumped to a thickener for dewatering.
The underflow from the thickener is further dewatered by a filter press to form dry cake for safe, eco-friendly dry stack disposal.
The clarified water from the thickener is recycled back into the process, minimizing fresh water consumption.