Abstract: A concrete reclaimer having a single meshed cylinder for separating concrete into its individual components. The reclaimer includes a hopper with a feed screw for feeding concrete aggregate into the reclaimer at a constant rate, a water spraying system for washing the concrete as it is being separated and flushing separated sand/cement components, heated inclined dewatering screws for separating the sand/cement slurry into its components, and settling ponds for removing cement from the water. The cylinder is made from coarse mesh which allows sand and cement to pass through, but not gravel, which is deposited onto an inclined conveyor adjacent the outlet the cylinder.

Abstract: A concrete reclaimer having a pair of concentric mesh cylinders for separating wet concrete into its original components. The invention includes a hopper and feed screw for feeding wet concrete into the inner cylinder at a constant rate. The concrete is washed by a water spray as it passes through the cylinders. The inner cylinder is made from coarse mesh which allows sand and cement, but not gravel, to pass through. Gravel is deposited from the outlet end of the inner cylinder. The outer cylinder is made from fine mesh, allowing cement, but not sand, to pass through. Sand is deposited into the bottom of at least one dewatering screw, which allows water to drain as it elevates the sand. The dewatering screw is in thermal contact with a heated liquid tank to prevent the water from freezing. The cement is dropped through the outer cylinder into a series of settling ponds, where it is allowed to settle out of the water.

Abstract: A centrifuge for dewatering a fluent aggregate material such as sand. Sand slurry is conducted into a rotating cylindrical drum which has a perforated lateral wall against which a screen is placed. The drum is oriented with the axis disposed vertically. When the centrifuge operates, centrifugal action slings slurry poured into the drum outwardly. Upon contacting the lateral wall, the slurry builds up. When a certain quantity of the slurry has built up at the bottom or floor of the cylinder, additional material cannot resist migrating upwardly. Thickness of the trapped layer varies, being greater at the floor, near the source of the incoming slurry. This trapped layer forms a bed having an inclined wall. Thickness of the bed at the top of the cylinder is determined by a circumferential, inwardly projecting flange or dam located at the top of the cylindrical drum. The sand bed protects metal parts of the centrifuge from abrasion, and also enables water to diffuse therethrough.

Abstract: A centrifugal separator has a separation chamber housing split into mating, unhinged clamshell sections. One clamshell section includes a pipe extending through the other clamshell section. The separation chamber rotates about the axis of the pipe. A spring secured to the frame of the separator surrounds the pipe, bearing against the second aforementioned clamshell section. This spring yieldingly opposes separation. The pipe and axis of rotation are oriented vertically. The pipe is divided into an upper inlet section and a lower outlet section by a flange or baffle. In alternative embodiments, the inlet pipe is fixed to different components, namely, one clamshell section, the other clamshell section, or to the frame of the machine. A slurry is introduced into the pipe inlet section, falls due to gravity, strikes the baffle, and exits the pipe through holes formed in the wall. The baffle redirects incoming slurry radially, so that when the separator is operated, centrifugal forces immediately act thereon.