Multi-layer shaking table for tungsten ore separation: A complete guide to efficient separation
Multi-layer shaking tables (such as four-layer cantilever type) are core equipment for gravity separation of tungsten ore (especially fine-grained tungsten ore). Their vertical stacking design significantly saves floor space, making them suitable for scenarios with limited space and requiring increased processing capacity per unit area.
Core Applicable Scenarios and Particle Size Range
Applicable Particle Size: Effective recovery particle size range 2-0.022mm, with particularly good results for fine sand (0.074-0.5mm) and slime (<0.074mm).
Suitable Tungsten Ore Types: Wolframite (stemonite), scheelite (calcium tungsten ore), especially suitable for ores with significant density differences from gangue.
Process Positioning: Commonly used for roughing, scavenging for rapid tailings removal, or for cleaning to improve grade; can be used as core equipment in gravity separation processes.
Multi-layer Shaking Table Parameters
Structural Advantages: The four-layer cantilever design improves floor space efficiency by 4 times compared to a single-layer design, with a total processing capacity of 2-4 t/h (fine sand grade), suitable for large-scale mineral processing.
Standard Operating Procedure (Taking fine sand grade scheelite as an example):
Pretreatment: The raw ore is crushed and ground to 0.2-2 mm, graded and deslimed to remove fine particles down to -0.074 mm (to avoid interfering with the separation).
Roughening: A 6-S coarse sand shaking table is used, with a stroke of 12-20 mm, a stroke rate of 250-300 strokes/min, and a slope of 5°-10°, to quickly separate gangue, achieving an enrichment ratio of 5-8.
Scavenging: The roughing tailings are treated by switching to a fine sand shaking table, with a slightly reduced stroke and stroke rate, and a slower water flow velocity, to recover residual tungsten minerals.
Fine Refinement: The coarse concentrate is regrinded to **-0.1mm**, using a grooved-bed slime shaking table with a stroke of 8-12mm, a stroke rate of 200-240 strokes/min, and a slope of 2°-5°. The target grade is WO₃>65%.
Parameter Fine-tuning:
Feed Rate: The coarser the particle size, the larger the feed rate, ensuring uniform ore distribution on the bed surface.
Wash Water: The water flow should be uniform and moderate. Too much water increases the grade but reduces the recovery rate; too little water results in slime in the tailings. Slightly more water is needed for coarse particles/fine refinement.
Equipment Selection and Process Optimization:
Selection Basis: Given limited space, a four-layer shaking table is preferred, saving over 70% of plant area.
Coarse tungsten ore fine refinement uses a coarse sand shaking table (parallel groove); fine particle/slime fine refinement uses a slime shaking table (diamond groove/smooth surface).
Efficiency Enhancement Techniques: Combining a jig for coarse tailings removal with a shaking table for fine refinement can achieve a total recovery rate of over 82%.
Controlling the feed concentration is crucial; too high a concentration can lead to poor stratification, while too low a concentration can result in the loss of fine particles. Maintaining a stable concentration is key.
Regularly inspect the wear of the grooves on the bed surface and repair them promptly to ensure effective separation.
Typical Case Study: A tungsten mine in Jiangxi upgraded 24 single-layer shaking tables (occupying 196m²) to 6 four-layer shaking tables (occupying 51m²), saving 74% of the plant area while maintaining the same processing capacity and achieving a stable increase in separation efficiency.
Summary: The core of multi-layer shaking table tungsten ore beneficiation is particle size matching and precise parameters. Prioritizing particle size classification, combined with pretreatment and a three-stage (roughing-scavenging-cleaning) process, can balance recovery rate and floor space efficiency.
4 layer shaking table for Tungsten plant
