Ltd. product: roller mill / vertical / for coal grinding / high-pressure YGM85.Raw coal is fed through a centrally located feed pipe to the center of the grinding table As the flat grinding table rotates coal is gradually forced out towards the edge where it passe. Get price. vertical roller coal mill vertical roller coa. Description of roller mill coal grinding: roller mill coal grinding is also called raw meal vertical ...ATOX coal mill. Working principles The raw coal enters the mill via a rotary sluice and feed chute and is discharged onto the rotating grinding table. The rotation of the table accelerates the flow of material towards the grinding track