Screening type peripheral discharge mill

Claim 1

A GRINDING MILL COMPRISING A CYLINDRICAL DRUM MOUNTED ON A SUPPORTING STRUCTURE FOR ROTATION ABOUT A SUBSTANTIALLY HORIZONTAL AXIS AND HAVING A HEAD CLOSING EACH OF ITS ENDS, A FEED TRUNNION EXTENDING INTO ONE SAID END, PLURALITY OF SEGMENTAL LINERS ASSEMBLED TO FORM A PERFORATE, ANNULAR STRUCTURE ADJACENT BUT SPACED FROM THE PERIPHERY OF THE DRUM AND FITTED BETWEEN THE HEADS, A SECOND PERFORATE, ANNULAR MEMBER EXTERIORLY OF THE LINER STRUCTURE HAVING SCREENING PORTIONS IN SPACED RELATION THERETO, PARTITIONING MEANS ON THE LINERS HAVING A PORTION EXTENDING INTO THE SPACE BETWEEN THE ANNULAR MEMBERS AND DEFINING THEREWITH A PLURALITY OF SEPARATION CHAMBERS IN CIRCUMFERENTIAL ARRANGEMENT ABOUT THE DRUM, THERE BEING A PASSAGE AT THE TRAILING END OF EACH CHAMBER FOR CONDUCTING OVERSIZE REJECT TO THE INTERIOR OF THE DRUM, MEANS IN THE FORWARD END OF EACH CHAMBER FOR DISCHARGING A SLUICING FLOW THROUGHOUT THE CHAMBER, MEANS FOR INTERMITTENTLY SUPPLYING SLUICING LIQUID TO THE DISCHARGE MEANS, THE OPENINGS IN THE OUTER ANNULAR MEMBER BEING OF A DIMENSION TO PASS A PREDETERMINEDM, MAXIMUMSIZE MATERIAL AS THE PRODUCT DISCHARGE OF THE MILL AND TO REJECT OVERSIZE, THE OPENINGS IN THE LINER MEMBERS BEING LARGER THAN THE OPENINGS IN THE OUTER ANNULAR MEMBER, AND MEANS FOR ROTATING SAID DRUM.