Dear mr. Arman

The back spillage of cement may occure while discharging through chute to belt conveyor to avoid this pl. check the chute if chute is discharging material vertically over belt in that case material may rush in all directions. so chute should be inclined enough (45 to 55 deg ) to belt and have some horizontal lip.Besides this use modular skirt system in chute. hope this may solve ur. problem