Patent ID: 7900778

Claim:
A system for rejecting a portion of non-metallic particulate material containing a piece of tramp metal, the system comprising: a first conveyor having a discharge end, the discharge end positioned to discharge particulate material from the first conveyor to an intake opening; a metal detector positioned adjacent to the first conveyor and upstream a travel distance from the discharge end; a redirection device provided at the discharge end of the first conveyor, the redirection device comprising a second conveyor positioned so that particulate material discharged from the discharge end of the first conveyor is deposited onto the second conveyor, the second conveyer having a first end positioned over the intake opening and a second end positioned away from the intake opening, the second conveyor further being bidirectional such that the second conveyor operates in a first direction to direct the particulate material into the intake opening and in a second direction to direct the particular material away from the intake opening; and a controller comprising at least one processor, the at least one processor operative to: in response to receiving a metal detected signal from the metal detector, the metal detected signal indicating that the metal detector has detected a piece of tramp metal in the particulate material traveling along the first conveyor, determine a travel time for the piece of tramp metal to reach the discharge end of the first conveyor; and activate the redirection device so that the second conveyer operates in the second direction to redirect particulate material discharged from the discharge end of the first conveyor away from the intake opening at the travel time.