4800 t/d Alluvial Gold Ore Beneficiation Plant

Case Details

Introduction: Alluvial gold deposits are widely distributed worldwide, featuring high grades, low investment thresholds, and fast return on investment. In this project, Shunzhi provided a full range of services, including process design, equipment supply, and on-site installation guidance, ensuring the plant was successfully commissioned and met production targets. The project adopted a combined gravity separation–amalgamation process, which features a short construction period, low cost, and fast economic return.

• Raw Ore Screening

A circular vibrating screen is used to remove oversized stones and debris. The particle size is generally controlled below 25 mm to ensure subsequent sorting efficiency.

• Washing & Crushing

A trommel scrubber washes and breaks down clay clusters, releasing free gold particles. The slurry concentration after washing is controlled between 30% and 40% solids.

• Two-Stage Grinding & Classification

A two-stage grinding circuit coupled with two stages of hydrocyclone classification was designed to ensure the grinding product fineness reached 90% passing 200 mesh, achieving sufficient liberation of gold minerals.

• Gravity Pre-enrichment

Centrifugal Concentrator is employed to recover coarse gold. After pre-enrichment, the gold concentrate yield is typically 1%–3% of the raw ore, with a gold recovery rate reaching 60%–80%.

• Amalgamation

The gold-rich concentrate is mixed with mercury (Hg) to form amalgam (gold content: 30%–50%). The mixture is then filtered or distilled to separate and recover the mercury, yielding sponge gold.

• Amalgam Distillation & Gold Recovery

The amalgam is heated in a sealed furnace at 300–400 °C, causing mercury to volatilize. The vapor is condensed and collected for reuse, leaving behind sponge gold.

• Mercury Recycling & Environmental Protection

A closed-loop condensation and activated carbon adsorption system is installed to recover mercury and prevent environmental contamination in compliance with green production standards.

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