Patent ID: 11865582
Assignee: PORTAFILL INTERNATIONAL LIMITED
Field: Chemical engineering (Chemistry)
Classification: CPC B | IPC B

Claim 12:
13. A method of grading a mixed material into three graded streams, comprising at least the steps of:
providing a combination screening apparatus comprising a disc screen wholly or substantially located within a rotary drum screen, the apparatus including a rotary drum screen housing with a door mounted on the side of the drum screen housing, the drum screen housing configured to contain the disc screen and drum screen during operation, wherein either the disc screen or the rotary drum screen, or both the disc screen and the rotary drum screen, are removable from the housing, and wherein at least a portion of the disc screen curves upwardly towards a discharge end within the housing; wherein the drum screen and the disc screen are configured to be combined to form a combination screen, with the disc screen positioned inside the drum screen; wherein the drum screen and the disc screen are further configured to be separable from each other, allowing the disc screen and the drum screen to each operate as independent screens, and wherein the combination screen is detachable and removable from the apparatus through the door on the side of the drum screen housing;
locating the mixed material onto an inlet end of the disc screen; and
operating the rotary drum screen and the disc screen to provide three graded streams from the disc screen and rotary drum screen.