An alluvial tin processing plant takes advantage of the natural “pre-concentration” of placer deposits. First of all, cassiterite (SnO₂) has a high specific gravity (6.8–7.1 g/cm³), making it ideal for gravity separation. Furthermore, it is hard and chemically stable, resisting degradation during transport. Therefore, unlike hard rock tin, an alluvial tin processing plant requires no crushing or grinding — only washing, screening, and gravity separation, resulting in much lower capital and operating costs.

This 3D flow sheet illustrates a complete 2000 TPD (24-hour operation) alluvial tin processing plant. The core logic is “Wash & Screen → Jig Roughing → Shaking Table Cleaning.”

1. Feeding & Hopper:An excavator feeds raw ore into trommel screen.
2. Washing & Screening:Raw ore enters a Trommel Screen. High-pressure water washes away clay, while the rotating drum screens out large gravel and debris. This step is critical — if clay is not thoroughly washed, tin particles will be wrapped and lost in the tailings.
3. Jig Roughing(Coarse Tin Recovery): The undersize slurry is fed into Jig Machines. Jigs use pulsating water to stratify heavy minerals, recovering coarse tin particles (typically a few millimeters) efficiently at a high capacity. This is the “workhorse” of alluvial tin recovery.
4. Slurry Pumping & Distribution: The jig concentrate is pumped by a Slurry Pump to a distributor, which evenly feeds multiple Shaking Tables.
5. Shaking Table Cleaning(Fine Tin Upgrading): Shaking tables provide the final precision separation. Through bed oscillation and water flow, tin concentrate, middlings, and tailings are separated into distinct bands. After multi-stage cleaning, tin concentrate grade can exceed 60%, meeting smelter requirements. Middlings are returned for re-processing to maximize recovery.