INJ EE HAD BEEN HELPING POKE LOOSE MATERIAL BUILD UP IN THE PREHEAT TOWER DUCTS. WHILE HE WAS CLIMBING A LADDER UP TO THE 3RD FLOOR HE LOOKED UPWARD & SOME KILN DUST THAT HAD ACCUMALATED IN THE FRAME OF HIS FACESHIELD FELL INTO HIS LEFT EYE THIS EYE WAS FLUSHED AT THE PLANT & THE HOSPITAL ER. HE WAS PUT ON RESTRICTED DUTY FOR HIS NEXT SHIFT & WAS LATER RELEASED TO FULL DUTY