| 摘要 |
<p>Wet unset concrete is delivered to a concrete mixer drum and water is sprayed onto the concrete as is necessary. Then, the concrete is delivered into a scrubber drum (6) which is rotated and as it rotates, the concrete is mixed, agitated and washed by means of internal paddle blades. The concrete is then gradually delivered to a cylindrical rotary screen (8). As the wet concrete is delivered into the rotary screen (8), a spray bar delivers water to further wash the aggregate and to deliver the sand, fines, cement and most of the water into an outlet hopper (12). The washed aggregate is delivered onto a conveyor (13) and then to storage hoppers (14). The aggregate can be further screened, separated and sized. An outlet hopper associated with the rotary screen (8) delivers a slurry which is then further screened by a flat bed screen (9) such that the sand is delivered to the conveyor (13) and a slurry now of fines, cement and water is delivered to a settling tank assembly (20). Relatively clean water is then removed for recycling.</p> |
