Anhui 2,800t/d Quartz Glass Sand Processing Plant

  The raw ore is first crushed to a particle size of less than 3 cm by a jaw crusher and a cone crusher. It is then conveyed by belt conveyor through a buffer silo and feeder to the mill for grinding and sand production. The ground product enters a post-grinding screen (2-3 mm mesh) for screening. The undersize fraction enters the slurry tank, while the oversize fraction is returned via a return conveyor for secondary sand production.

  The material in the slurry tank is pumped to a scrubber via a slurry pump. This mechanically applies soft compression and friction to the material, effectively removing impurities such as colloids, thin films of iron, and aluminum from the sand grains' surface. The slurry is then pumped into a desludging hopper located above the grading tower, achieving a preliminary separation of sand, mud, and impurities, reducing mud content while maintaining slurry balance.

  The desludging product enters a hindered settler, where coarse particles larger than 26 mesh (adjustable) are separated. This fraction is then returned to the mill for re-grinding via a return device. To improve grading efficiency, the hindered settler is equipped with a safety screen to assist in grading. Fine particles below 26 mesh enter a hydraulic classifier, which further separates the finer particles below 140 mesh.

  After classification, the qualified product enters a medium-magnetic plate magnetic separator (magnetic field strength 4000–4500 GS) to remove mechanical iron impurities. It then enters a high-magnetic plate magnetic separator (12000–13000 GS) to further remove all mechanical iron and some weakly magnetic iron. The product then passes through a vertical ring high-gradient magnetic separator (electromagnetic, magnetic field strength 1.4T, two units connected in series) for deep iron removal.

  The iron-removed product enters a thickening hopper for concentration and is then conveyed to the flotation section, where flotation completes the final dealuminization, de-ironization, and silicon extraction processes. The flotation product passes through a dewatering screen to reduce moisture content before being transported by belt conveyor to the finished product area for the next step.

  The entire process is equipped with a thickener to recycle system water. After the thickener settles the silt, the clear water is recycled back into the wet sanding system. The settled sludge is pumped through a slurry pump to a filter press or ceramic filter for water-sludge separation. The dehydrated sludge cakes are then stacked in a shed. Fine sand is initially dehydrated in a thickening hopper and collected as secondary sand.

  The final products include refined sand, secondary sand (fine sand), and dry sludge cake. The entire process recycles water resources, requiring only a small amount of water replenishment and no external discharge.