Zimbabwe 500t/d Glass Sand Mineral Processing Plant

The raw ore first undergoes sand making, cleaning, desludging, and classification.

After the mill grinds the raw ore into sand, it is fed to a post-grinding screen (2-3mm mesh) for screening. The undersize product enters the slurry tank, while the oversize product is returned via a return conveyor for secondary sand making.

The product in the slurry tank is pumped into a scrubber via a slurry pump, where surface colloids, thin films of iron, and aluminum are removed through physical, flexible extrusion and friction.

The scrubbed slurry is pumped into the desludging hopper on the grading tower by a slurry pump to separate sand, mud, and impurities, reduce mud content, and balance the slurry.

The desludging product enters a hindered settler, where coarse particles larger than 26 mesh (adjustable) are separated and returned to the mill via a return device for re-grinding. The hindered settler is equipped with a safety screen to improve classification efficiency.

Product below 26 mesh enters a hydraulic classifier, which separates fine particles smaller than 140 mesh.

The qualified particle size product output from the blocked settler and hydraulic classifier enters a high-magnetic plate magnetic separator (magnetic field strength 12,000-13,000 GS) to remove all mechanical iron and some weakly magnetic iron.

The iron-removed product enters a vertical ring high-gradient magnetic separator (electromagnetic field strength 1.4 T) for deep electromagnetic iron removal.

The iron-removed product enters a thickener for concentration and is then sent to the flotation equipment area for dealuminization and iron-silicon extraction.

The flotation product passes through a dewatering screen to reduce moisture content and is then transported by belt conveyor to the finished product area for the next process.

The system is equipped with a thickener to collect water from various systems and settle it, with the clear water being reused in the wet sanding system.

The slurry from the thickener is pumped by a slurry pump to a filter press or ceramic filter for cement separation. The mud biscuits are stacked, and the fine sand is collected in a thickener after water removal as a secondary sand product.

The final products include concentrated sand, secondary sand (fine sand) and dry mud cake. The entire process is free of external discharge and only requires a small amount of water replenishment.