The STLB series gold centrifugal concentrator represents a proven mercury-free solution for fine gold recovery in alluvial and hard rock mining operations. Designed specifically for the demanding conditions of Colombia's Antioquia and Chocó gold regions, this equipment achieves recovery rates of 90-98% on gold particles down to 200 mesh, effectively replacing traditional mercury amalgamation methods prohibited under the Minamata Convention. The fluidized bed centrifugal technology generates gravitational forces up to 60G, enabling the capture of ultra-fine gold that conventional gravity equipment such as shaking tables and jigs would otherwise lose to tailings.

This concentrator operates on a principle of enhanced gravity separation combined with fluidized water injection. Feed slurry enters the rotating bowl where centrifugal force stratifies particles by density. High-density gold particles are trapped within the riffled bowl lining while lighter gangue minerals are continuously flushed out by counter-flow fluidization water. The unique water jacket design ensures uniform fluidization pressure distribution across the entire bowl surface, preventing channeling and maximizing particle-to-riffle contact efficiency. The intermittent concentrate discharge mechanism can be programmed via PLC control to match the specific ore characteristics and desired concentrate grade.

• Mercury-Free Gold Recovery: Fully compliant with Minamata Convention requirements, eliminating the environmental and health hazards associated with mercury amalgamation. The purely physical separation process produces clean gold concentrate without any chemical additives.
• High Recovery for Fine Gold: The 60G centrifugal force field captures gold particles as fine as 200 mesh (74 microns) that escape conventional gravity circuits. Verified recovery rates of 90-98% on fine-grained alluvial and hard rock gold ores across Latin American operations.
• Variable Frequency Drive Control: The bowl rotation speed is adjustable via VFD, allowing operators to optimize G-force settings for specific ore types. Higher speeds enhance fine particle recovery while lower speeds improve concentrate grade for coarse gold deposits.
• Automatic Intermittent Discharge: PLC-controlled concentrate discharge sequence reduces manual labor and ensures consistent operation. Discharge intervals can be programmed from 30 minutes to 4 hours based on ore grade and accumulation rate.
• Compact Modular Design: The skid-mounted configuration with integrated feed pump and control panel enables rapid deployment at remote mining sites. Minimal foundation requirements reduce installation time and civil engineering costs by up to 60% compared to conventional gravity circuits.
• Anti-Abrasion Bowl Lining: The riffled bowl interior is lined with high-chromium white iron or polyurethane wear plates, extending service life to over 8,000 operating hours in abrasive ore conditions typical of Andean alluvial deposits.
• Low Water Consumption Optimization: The closed fluidization circuit minimizes fresh water make-up requirements to 5-150m³/h depending on model size. Recirculation-compatible design supports water-scarce or seasonally dry operation environments.

The STLB centrifugal concentrator is purpose-built for fine gold recovery across multiple ore types and mining environments. Primary applications include alluvial gold placer deposits in the Antioquia and Chocó regions of Colombia where fine-grained gold below 100 mesh constitutes the majority of recoverable values. For hard rock gold operations, the STLB serves as an effective scavenger unit processing grinding circuit cyclone underflow to capture liberated gold before it reports to flotation or leaching circuits. The equipment also demonstrates strong performance in tailings retreatment projects, recovering gold values from legacy mine dumps and tailings ponds that contain residual fine gold particles. In polymetallic operations, the STLB can be installed ahead of flotation to pre-concentrate free gold, reducing reagent consumption and improving overall circuit economics. Additional applications encompass gold-bearing eluvial and colluvial deposits, riverbed gravel processing, and small-scale artisanal mining operations transitioning from mercury-based extraction to environmentally compliant gravity methods.

Each STLB centrifugal concentrator undergoes comprehensive factory testing before shipment, including dynamic balancing verification, bowl concentricity measurement, fluidization water distribution uniformity testing, and full-load trial run for a minimum of 4 continuous hours. All test data and certificates are documented and provided to the buyer. Equipment is packed in reinforced export-grade plywood cases with internal VCI anti-rust film and foam cushioning. Critical components including bearings, seals, and the VFD control panel are vacuum-sealed for moisture protection during ocean transport. We provide a 12-month warranty from the date of commissioning, covering all manufacturing defects. Our engineering team is available for on-site installation supervision, operator training, and commissioning support at buyer locations in Colombia and throughout Latin America.