Stainless construction
Stainless bodies and cathodic shell protection.
CGS / MINING EQUIPMENT
Every component.
A considered design.
Explore the equipment behind your recovery process. Rotate the models, understand the design approach, and discuss your project with our team.
01 / PRECIOUS METAL RECOVERY
ELECTROWINNING CELLSElectrowinning
cells.
Modeled around your process. Sized around your recovery requirements.
Elution modeling & cell sizing
CGS begins each job by mathematically modeling the solution entering the cell during every minute of its simulated operation.
The CGS elution and electrowinning model combines first principles with years of staff experience. It predicts the rate at which precious metals are desorbed from activated carbon and removed from pregnant solution, informing cell sizing and system design.
ELECTROWINNING CELL / INTERACTIVE 3D
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3D model from CGS’s supplied equipment CAD. Configuration varies by project.
Tails grades lower than .5 ppm
Equipment designed around CGS electrowinning requirements.
In-cell washing
CGS’s in-cell washing approach avoids a separate wash bay and overhead crane.
02 / THERMAL SYSTEMS
HEATER SKIDRecover heat.
Reduce energy input.
CGS heater skid technology recovers energy from the electrowinning circuit while maintaining the process temperature profile.
Energy savings technology
The CGS heater skid uses a third heat exchanger to recuperate energy from the electrowinning cells. The same temperature profile as the traditional pressure Zadra process can be maintained across the barren tank, elution vessel and electrowinning cells, with substantially lower immersion heater energy input.
CGS attributes the reduction primarily to eliminating energy losses through cooling water during the heating cycle.
HEATER SKID / INTERACTIVE 3D
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Illustrative model based on CGS heater skid renders and photography. Not a dimensional specification.
A CONTROLLED TEMPERATURE PROFILE
Keep the process in balance.
A traditional pressure Zadra circuit maintains the following temperatures. The CGS skid is designed to retain that profile while reducing energy input.
| Process stage | Temperature | Why control matters |
|---|---|---|
| Barren tank | 65°C | Higher temperatures increase cyanide destruction. |
| Elution vessel | 148.9°C | Lower temperatures lengthen elution cycles. |
| Electrowinning | 88°C | Lower temperatures reduce current efficiency and recovery; higher temperatures can cause cell vaporization. |
INDIRECT COOLING
A different approach
to cooling the circuit.
A traditional Zadra process cools through flashing and cooling sprays inside the elution vessel, typically taking 1–2 hours. Calcium precipitation can plug vessel screens and reduce carbon activity. Rapid steam discharge also creates an operator hazard.
The CGS skid uses an oversized trim heat exchanger and a primary heat exchanger bypass line to cool indirectly. The described CGS sequence takes approximately 30 minutes:
- 01
Activate the trim exchanger
The operator opens the cooling water valve to the trim heat exchanger, which has remained off during the heating cycle. Solution leaving the elution vessel is cooled by 100°F in a single pass.
- 02
Bypass the primary exchanger
The 300°F solution leaving the elution column is routed into the trim exchanger, cooled by 140°F and returned to the barren tank.
- 03
Displace the hot solution
The 300°F solution in the elution column is displaced by 150°F solution from the barren tank. Indirect cooling avoids precipitation inside the elution column and venting steam to atmosphere.
03 / DESORPTION SYSTEMS
ADR / ELUTION PLANTSADR / Elution plants.
Integrated by design.
A modular approach to the recovery circuit.
CGS elution design brings single-point control for heating and cooling and an approach designed to minimize cyanide consumption. Discuss vessel design, equipment integration and complete plant pricing with our team.
The MOD-BLOC approach uses common dimensions, standard connections and dimensions in even multiples to support integration and expansion.
ADR / ELUTION PLANTS / INTERACTIVE 3D
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Illustrative model based on CGS elution equipment renders. Not a dimensional specification.
04 / CARBON REGENERATION
CARBON REGENERATION KILNRegenerate carbon.
Protect its performance.
Efficient, reliable regeneration with a focus on low oxygen ingress and minimal carbon attrition.
The CGS carbon regeneration kiln is designed to keep oxygen levels low, helping minimize carbon attrition during regeneration.
A seal designed for its service life
The CGS proprietary seal uses a wear-based system to maintain a proper seal throughout its operating life. Unlike a standard seal that can wear unevenly and allow increasing oxygen ingress, the CGS design accommodates wear over time.
When the seal reaches the end of its service life, its removable design makes replacement a matter of minutes rather than requiring a conventional tail-end rebuild.
CARBON REGENERATION KILN / INTERACTIVE 3D
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Illustrative model based on both supplied CGS kiln photographs. Not a dimensional specification.
Low oxygen ingress
A proprietary seal designed to maintain sealing performance and help minimize carbon attrition.
Simple seal replacement
A removable seal design for quick replacement without a standard tail-end rebuild.
Heavy insulation
Insulation reduces power and fuel consumption. The exterior is designed to remain cool to the touch, reducing exposed hot-surface hazards in the ADR plant.
05 / MERRILL CROWE SYSTEMS
ZINC FEEDERZinc addition.
Ready to integrate.
A complete, easy-to-install skid for precious metal precipitation.
In a Merrill Crowe plant, zinc powder precipitates silver and gold from the cyanide process solution. Proper clarification keeps suspended solids to a minimum, while deaeration helps minimize zinc consumption and optimize precipitation.
Once the solution is clarified and deaerated, it is ready for zinc addition and precious metal precipitation.
A complete zinc addition system
The CGS skid includes an appropriately sized hopper, head tank, mix cone, turntable, motor, control panel and variable-frequency drive (VFD) controls.
ZINC FEEDER / INTERACTIVE 3D
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Illustrative model based on the supplied CGS zinc feeder image. Not a dimensional specification.
Solution preparation
Clarification and deaeration prepare the process solution for efficient zinc addition.
Integrated skid
Hopper, head tank, mix cone, turntable and motor together in an easy-to-install system.
Controlled addition
Control panel and VFD controls to support the zinc addition process.
LET’S DISCUSS YOUR PROCESS
The right equipment.
Starts with a conversation.
YOUR CGS CONTACTCameron Barton
cameron.barton@cgsmining.com