Impact Crushers Applied in Crushing Cement

Production rates for these crusher machines are impressive, with some of the larger mobile crushers able to handle over 600 tons per hour. At an in-place density of approximately 145 pounds per cubic foot, this is equivalent to almost 8,300 cubic feet—or 550 feet of a two-lane road having a 6-inch-thick pavement surface—each hour. A mile of such a roadway could be processed each workday. Smaller mini-crushers can handle up to 150 tons per hour. The basic configuration of a cement crusher, no matter what its throughput rate, is fairly simple: a hydraulic apron feeder to the rubble crusher, a discharge conveyor belt for carrying broken debris to a screener, and a return conveyor for chunks too large to pass through the screen. Mounted directly above the discharge belt is a magnetic separator for steel removal that is set at a height sufficient for direct discharge into waiting hauling trucks (this avoids double handling).

Primary impacts are the preferred crusher type due to their speed and versatility compared to cone crushers or jaw crushers. Since they are able to reduce incoming chunks to one-thirtieth of their original size, primary impacts usually have no need for a secondary crushing unit (unless the final product needs to be less than one inch in diameter). Looking from the outside like a strangely shaped dumpster, a primary impact crusher is housed in heavy-duty steel with heavy-duty wear liners affixed to the inside walls. Cement debris enters through an oversized inlet and hits a heavy-duty mono-block front apron that directs the incoming debris to a heavy-duty rotor equipped with reversible steel blow bars set in place with wedge shoes. The rapidly spinning rotor, rotating on heavy bearings, smashes the blow bars into the debris, acting as a rotating hammer. The anvil is a set of very heavy-duty impact plates whose distance from the rotor can be adjusted with a retractable housing. Caught between the fixed plate and the swinging blow bars, rock is crushed into smaller pieces that discharge through the bottom.

Disposal and Recycling

In most cases, broken and excavated cement is disposed of in C&D landfills along with other debris (roofing shingles, wall insulation, lumber, drywall, brick and masonry, broken glass windows, etc.). Cement, along with asphalt pavement and masonry, constitutes up to 25% of the waste mass disposed of in C&D landfills.

Typically, in-place cement weighs approximately 145 pounds per cubic foot (or over 3,900 pounds—almost two tons—per cubic yard). This weight can vary with the type of cement, and this variability depends on the amount and type of the aggregate, the volume of entrained air bubbles, the water content, the amount of cement utilized, and the effects of the admixtures used in the cement. Breaking up the cement into chunks small enough for excavation and hauling results in significant void volumes within the waste mass. The resultant jumbled pile of cement debris and voids has a much lower density than in-place cement.

As the professional manufacturer of complete sets of mining machinery, such as Portable crusher,classifiers,Flotation cell,Wet magnetic separator, Henan Hongxing is always doing the best in products and service.