Total railroad and truck shipments represent approximately equal tonnage. The uncontrolled spout is normally not used to fill trucks.) (Typically, the uncontrolled spouts are used to pre-fill railroad cars and the controlled spouts are used for the final filling of railroad cars and the complete filling of trucks. One spout is used for finish filling of railroad cars and the other spout is used for filling trucks. Sand is also transported by screw conveyor from the bottom of the silos to a third bucket elevator which empties into two elevated hopper bins each equipped with a controlled (ventilated) loading spout. Sand can be loaded directly from the silos through one of three uncontrolled (non-ventilated) loading spouts into railroad hopper cars or one uncontrolled loading spout into trucks.
The sand is dried, screened, and transported by a second bucket elevator to a screw conveyor which empties into one of three concrete silos. Damp sand discharges from the covered belt conveyor into a bucket elevator which transports the sand to the dryer. A front-end loader moves the sand to a covered belt conveyor, which transports it 1,000 feet to the sand drying and loading area. One operator and one helper work in the processing building.Īfter processing, the wet sand is conveyed outside and stockpiled in the open. A ball milling step can be added to the process for size reduction. In the process building, the sand is sized by settling (coarse fraction removed), dewatered (clay removed), passed through a scrubber, again dewatered by two parallel screws, and then passed through a flotation circuit (iron impurities removed). The sand/water slurry is pumped to a scalper to remove rocks and slime from the slurry. In the first factory, dredges are used to mine sand from flooded areas under the topsoil, typically reaching depths of 50 feet. Reports from three sites were used to create this summary. The operations in the case report supplies washed sand mainly to the glass industry but also for other industrial uses. Silica Dust Exposure Control in Industrial Sand Processing Operations. To search the database, enter a keyword such as the industry or exposure type, or hit the search button to return all records.
0 kommentar(er)
