How to Improve the Recovery Rate of Rock Gold Ore?

I. Multi-Stage Crushing While Avoiding Over-Crushing

The raw ore first enters the crushing stage, typically adopting a two-stage crushing process. Coarse crushing is recommended using a jaw crusher, whose powerful crushing force can efficiently break hard rock gold ore. For fine crushing, a cone crusher is employed, utilizing the laminated crushing principle to produce uniformly sized output with low over-crushing rates. This provides appropriately sized feed for subsequent grinding, facilitating the full liberation of gold minerals.

II. Wet Grinding for Full Liberation of Gold Minerals

Grinding is a core affecting gold recovery. An overflow ball mill is used for wet grinding, reducing the ore to approximately 200 mesh through the impact and grinding action of steel balls. To precisely control product fineness, the ball mill is often paired with a spiral classifier in a closed-circuit system. This setup promptly separates qualified particle sizes, prevents over-grinding, ensures complete monomer liberation of gold minerals, and creates favorable conditions for separation.

III. Multi-Step Gravity Separation to Recover Gold of Various Particle Sizes

Gravity separation is a primary process for hard rock gold beneficiation. Commonly used equipment includes jig machine, shaking tables, and centrifugal concentrators.

Jig machine achieve rapid settlement and enrichment of coarse gold through pulsating water flow; shaking table are suitable for treating jig tailings, recovering fine gold by utilizing mechanically shaken water flow; centrifugal concentrator generate strong centrifugal force via a rotating drum, significantly enhancing the recovery rate of fine gold particles. Adopting multi-step gravity separation expands the recoverable particle size range, minimizing gold loss to the greatest extent.

IV. Rational Application of Flotation for Refractory Ores

For oxidized hard rock gold ores or gravity separation tailings, flotation serves as an important supplementary method. Mechanical agitation flotation machines, by using reagents to adjust the hydrophobicity of mineral surfaces, enable selective attachment of gold particles to air bubbles and their subsequent flotation. This achieves efficient separation of gold from gangue, proving particularly effective for recovering disseminated and impregnated gold.