Slag Vertical Roller Mill2019-01-14

Slag Vertical Roller Mill

Summary:Reasons for low efficiency of Slag Vertical Roller Mill Influence of equipment construction on grinding efficiency 1. Influence of the center on the mine defect The feeding mode of the Slag Vertical Roller Mill is the …

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Reasons for low efficiency of Slag Vertical Roller Mill

Influence of equipment construction on grinding efficiency

1. Influence of the center on the mine defect

The feeding mode of the Slag Vertical Roller Mill is the center feeding, the center of the Slag Vertical Roller Mill means that the ore is fixed, and the Slag Vertical Roller Mill is rotating to the mine end, and the two are through the sealing pad. The contact and sealing pads act to prevent the slurry from flowing back in the Slag Vertical Roller Mill. When the slurry in the Slag Vertical Roller Mill cavity is long, the slurry will inevitably flush the sealing rubber pad on the lower part of the Slag Vertical Roller Mill, which will aggravate the wear of the sealing rubber pad, and the sealing property will be reduced. The slurry will flow out from the worn gap. The crusher is fed to the mine end. In the production, in order to avoid the backflow of the slurry, the treatment capacity of the Slag Vertical Roller Mill has to be reduced, thereby reducing the slurry level inside the Slag Vertical Roller Mill and reducing the backflow phenomenon of the slurry. In addition, the Slag Vertical Roller Mill filling rate is difficult to increase, which means that the amount of grinding media involved in grinding is insufficient, the ore entering the Slag Vertical Roller Mill is not fully ground, and the amount of sand returned is increased, which limits the Slag Vertical Roller Mill. With the increase in the utilization factor, the electricity consumption and ball consumption of the tons must increase accordingly.

2. Impact of mine crusher discharge defects

The effective diameter of the Slag Vertical Roller Mill discharge center hole is 1180mm, and the effective diameter ratio is 1:3.18. Insufficient relative size affects the rapid discharge of pulp in the Slag Vertical Roller Mill. When the length to diameter ratio of the Slag Vertical Roller Mill increases from 1.2:1 to 1.37:1, the operating efficiency will decrease, the amount of pulp stored in the mill will be large, and the utilization factor will be affected. The increase, in order to speed up the discharge will inevitably reduce the grinding concentration and improve the fluidity of the slurry. The too fast slurry flow rate will also interfere with the grinding effect of the steel ball, affect the contact time between the slurry and the grinding medium, and increase the grinding medium capture. The difficulty of the ore particles increases the probability of “ball grinding ball, ball hitting ball”, which is not conducive to grinding efficiency and increase ball consumption.

Influence of process configuration on electromechanical consumption of Slag Vertical Roller Mill

The Slag Vertical Roller Mill is used for a period of grinding, and the multi-stage equipment constitutes a closed-circuit process. The classified equipment is mainly composed of a spiral classifier and a cyclone. The cyclone is arranged, and in the absence of natural height difference, the slurry pump is required to send the discharge of the Slag Vertical Roller Mill to the cyclone, in particular, the cyclone and the one-stage mill form a closed-circuit grinding process, and the cyclone is rotated. The grit of the flow device needs to be returned to a section of the mill, and the slurry pump needs to be configured. The motor power of the slurry pump is several times that of the spiral classifier motor. The Slag Vertical Roller Mill has a large diameter and length. At present, there is no large-scale spiral classifier matched with it, which basically forms a grinding and grading process with the cyclone configuration. The Slag Vertical Roller Mill discharge is classified by a cyclone. The motor power of the slurry pump is as high as 400kwh, and the power ratio of the raw ore processing capacity is more than 1.21kwh, which is one of the reasons for the high power consumption of the Slag Vertical Roller Mill.

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