Tin Alluvial Ore Gravity Separation Solutions

Stage 1: Screening & Intensive Washing

Raw ore is first classified and cleaned to remove sticky clay and oversized impurities, creating perfect conditions for gravity sorting.

• Ordinary Sandy Materials: Fed directly into a Trommel Screen to sift out barren gravel and roots.
• Highly Sticky Clay Materials: Fed into a Rotary Scrubber for deep, violent washing to dissolve the clay balls that would otherwise trap and steal the tin particles.

Stage 2: Roughing & Enrichment (The Core)

A graded gravity separation strategy is adopted. We route the washed sand to the specific equipment best suited for its particle size:

• Coarse Particle Level (+0.5mm): Sent to Mineral Jiggers. Jigs offer massive processing capacities and highly efficient recovery of coarse cassiterite.
• Fine Particle Level (-0.5mm): Sent to an array of Spiral Chutes. Spirals act as high-volume roughers, providing a remarkable recovery effect for fine tin sand.

Stage 3: Selection & Purification

The mixed, rough concentrates obtained from the Jigs and Spirals are pumped to 6-S Shaking Tables. The shaking table performs multi-stage selection (roughing, cleaning, sweeping) utilizing its precise visual sorting effect. By configuring multiple tables in series or parallel, we ensure a highly pure, commercial-grade tin concentrate.

Stage 4: Tailings & Water Treatment

Tailings (barren sand) are transported centrally by belt conveyors for backfilling. The muddy tailings water is pumped into a Thickener and Filter Press to separate the mud from the water. This realizes the dry-stacking of tailings and allows the clean water to be recycled back to the wash plant, heavily reducing environmental impact.

Q1: How do I choose between a Trommel Screen and a Rotary Scrubber?

A: It depends entirely on your soil matrix. If your tin is mixed in loose river sand and gravel, a standard Trommel Screen is sufficient to wash the rocks and sift the sand. However, if your deposit contains thick, sticky laterite clay, you must use a Rotary Scrubber. A scrubber uses internal lifter bars to violently tumble the rocks, acting like an industrial washing machine to break the clay balls apart. If you don't dissolve the clay, it will carry your tin right into the tailing pond.

Q2: Why use Jigs and Spirals together?

A: Placer deposits contain tin particles of varying sizes. Jigs are excellent at catching coarse, heavy tin (+0.5mm), but fine tin sand (-0.5mm) will get washed out of a jig. Conversely, Spirals are amazing at catching fine heavy sand, but coarse chunks can disrupt the flow. By splitting the feed and sending coarse sand to the Jigs and fine sand to the Spirals, we guarantee maximum recovery across all particle sizes.

Full-Cycle Turnkey EPC Services

Because alluvial mining requires no crushing or chemicals, equipment investment is low and the payback period is typically less than 12 months. GravityMineral provides end-to-end technical support:

• Pre-Consultation: Process flowsheet design and optimal equipment sizing based on your cassiterite particle size distribution and mud content.
• Manufacturing: Supplying highly durable, modular wash plant equipment.
• Installation & Training: Global on-site engineer deployment to guide installation, tune recovery rates, and train your operators.

Contact us today to receive a customized alluvial tin ore wash plant layout and equipment quotation.