Mercury-Free Gold Processing with Solar Pumps in the DRC
Introduction
Mercury-free gold recovery is now a compliance requirement across Central Africa, and the water that drives it must be clean and steady. This article covers mercury-free gold processing with solar pumps in the DRC, using the country’s artisanal and small-scale (ASM) and growing industrial belts as the worked example, written by the solar-pumping specialists at KINBO. A well-sized solar pump keeps gravity and centrifugal concentrators fed, the process-water twin of our controller work.
Table of Contents
Why Mercury-Free Needs Steady Water
- Feed the concentrators—a steady flow from the pump keeps gravity spirals and centrifugal bowls at design throughput.
- Drop the mercury—mercury-free circuits rely on water, not amalgamation pans, so our diesel-retrofit guide shows how solar replaces the old generator feeding the pan.
- Protect recovery—our efficiency-audit guide shows surging water ruins fine-particle capture.
- Plan spares—our maintenance guide keeps the feed on line, under our O&M SLA guide.
DRC Site Conditions
The DRC’s equatorial climate brings heavy rain and high humidity, so a mercury-free plant needs water that runs clean through the wet season. Our dust-and-heat guide and sizing guide frame the duties; here the prize is a pump that holds concentrator feed instead of hunting with the clouds or stalling in a downpour.
Sizing the Process-Water Pump
- Read the circuit—from the sizing, set the water rate per tonne of ore for gravity and centrifugal stages.
- Buffer the swing—a small tank smooths solar variation before the pump lifts to the concentrators.
- Control the flow—the controller trims output to the duty, not the sun.
- Watch throughput—monitoring tracks feed against plan, per our efficiency-audit guide.
- Service it—our maintenance guide and O&M SLA guide keep recovery steady.
Mercury-Free vs Amalgamation
| Aspect | Mercury-free + solar | Mercury amalgamation |
|---|---|---|
| Compliance | Meets Minamata rules | Banned / penalised |
| Power | Solar, low running cost | Diesel generator |
| Recovery | Clean, traceable gold | Losses to tailings |
For the cost case, our TCO guide weighs solar capex against diesel and mercury penalties.
Frequently Asked Questions
Why does mercury-free need steady water?
Gravity and centrifugal concentrators capture fine gold on a water film; surging feed loses particles, so the controller holds the rate.
Can solar really replace the amalgamation generator?
Yes—our diesel-retrofit guide shows the PV array, battery and pump taking over the water duty with no mercury pan.
How do I confirm throughput?
Flow logging in monitoring shows the rate held, under our O&M SLA guide.
How do I start a DRC mercury-free feed?
Share your circuit duty and we size a buffered, controlled solar pump feed that meets Minamata rules.
Related Articles
- Diesel-to-Solar Retrofit for Gold-Mine Pumps in the DRC
- DC/AC Controllers for Gold-Mine Solar Pumps
- Energy Efficiency Audits for Gold-Mine Solar Pumps
- Explore KINBO Solar Pump Products
Run Your DRC Gold Plant Mercury-Free on Solar
Tell KINBO your concentrator duty, and we will size a buffered, controlled solar pump feed that meets Minamata rules. Contact our team for a tailored quote.
Published by KINBO · October 19, 2026 · Category: Application Cases