DURING KILN SHUTDOWN EE WAS WORKING WITH MAINTENANCE REPAIRING THE PRECIPITATOR COLLECT SCREW CONVEYOR. WHEN PLACING THE SCREW LID ON THE FLOOR,IT BOUNCED UP AND A BURR ON THE EDGE OF THE LID STRUCK AND CUT HIS RIGHT MIDDLE FINGER CAUSING A1 1/2"" LACERATION THAT REQUIRED 4 SUTURES TO CLOSE.