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InLine Leach Reactor - Batch ILR
Batch InLine Leach Reactor Operation
The concentrates from the primary recovery device report to the feed cone for de-watering, with the water overflowing and returning to the mill circuit. Solids are stored in the feed cone until the beginning of each leach cycle.
The Batch InLine Leach Reactor works on the principal of the laboratory bottle roll to keep the solids in contact with the liquor. A horizontal drum rotating at low speed with a set of specially designed baffles and aeration system for maximum leach performance. Residence time is predicted in the laboratory and controlled by leach cycle time. During leaching solution is continually recirculated through the solids from the solution storage tank to ensure a fresh supply of reagents, including oxygen, is always available for leaching.
At the completion of the leach cycle the pregnant solution is clarified then pumped to the electrowinning circuit. Barren solids are emptied by reversing the drum rotation and pumped to the mill circuit. Pregnant liquor is pumped to the electrowinning circuit where it can be recovered in a dedicated electrowinning cell or mixed with the main elution solution. The barren solution from electrowinning is then pumped to the CIL/CIP circuit (optionally to the ILR) to reuse the residual cyanide.
The batch ILR accomplishes this by cycling through discrete steps.
- Load concentrate into Reactor Drum
- Adjust initial solution volume and add reagents
- Leach by re-circulating solution through reactor drum
- Drain drum and with floc clarify pregnant solution pumping into solution storage tank
- Wash solids with water
- Drain and clarify wash water to solution storage tank
- Empty solids from Reactor Drum and transfer to mill
- Drain remaining water to mill
- Transfer solution to electrowinning circuit
Specific Advantages Of The Batch Inline Leach Reactor
- Captures and leaches fine and coarse gold
- Engineered to prevent gold precipitation on mill scats
- Simple system with low component count; 1 drum; 1 pump; 1 sump; 2 tanks
- Low operating costs with no requirement for expensive chemical leach agents
- Low installed power of less than 10kW
- Dedicated clarification step reliably produces clear electrowinning solutions
- Pregnant solution is highly suitable for recovery by electrowinning
