DURING KILN SHUT DOWN, EE WAS REAPLCING GRATES ON #2 CLINKER COOLER DRIVE. HE WAS HOLDING A WRENCH ON THE BOTTOM OF A GRATE WHILE ANOTHER EE USED AN IMPACT WRENCH ON THE TOP OF THE GRATE. THIS CAUSED CLINKER DUST TO FALL THROUGH THE GRATE AND GET INTO EE'S EYES, WHICH CAUSED CORNEAL ABRAISON TO HIS RIGHT EYE. EYE DROPS WERE PRESCRIBED.