It's more suitable for finer ores which less than 5mm. Silica vertical roller mill is composed of trough, spiral, transmission, elevator machine, support bearing, etc. The down flow weir of the high weir type is higher than the lower bearing, but lower than the upper edge of the lower spiral. This mining equipment is a horizontal long axis with helical blades in the U trough, and a down flow weir designed in the lower place.  The transmission is installed in the upper chute; the upper main spiral shaft supports the bearing on the drive frame, while the lower bearing is fixed at the level of the elevator. The elevator is able to make the lower part of the spiral ascend and descend to regulate the distance between the spiral and the bottom of the chute as well as the confirming size of the spiral.