EE WAS STANDING BENEATH SMALL HOPPER (EMPTY). THE HOPPER WAS OPEN @ THE BOTTOM & WAS BEING RE-LINED IN PREP. FOR REFRACTORY. EE WAS HOISTING EQUIMENT INTO HOPPER FR. BOTTOM HATCH USING CHAINFALL WHEN SOME LOOSE REFRACTORY DUST THAT WAS SITTING ON SCAFFOLD PLANKS FELL ONTO HEAD & NECK AREA. SOME DUST FELL BEHIND HIS SAFETY GLASSES & INTO HIS EYE.