The feed port of the mill is the only way for materials to be fed into the barrel of the ball mill. Only a smooth road can ensure the normal operation of the ball mill. In actual production, we may encounter material spitting or slurry leakage from the feed port of the ball mill. Do you know the cause of this problem and how to deal with it? Please continue to read below.

Reasons for material spitting and slurry leakage at the feed port of ball mill

Since the feed port is spitting out slurry and leaking slurry, we have to look for the reasons from the following aspects: whether the feed port is blocked, whether the feeder connected to the feed port is properly selected, and whether the ball mill barrel is overfull. To sum up, there are four reasons:

1. The feed port is blocked

If the feed port is blocked, it is necessary to clear the feed port. There are two main reasons for the blockage of the feed port. 1. The installation position of the feed process water is unreasonable. 2. The feed process water and the slurry dilution water at the outlet of the ball mill. The distribution is unreasonable. Therefore, reasonable allocation of process water and outlet slurry dilution water is an important way to solve the problem of blockage of the feed port.

2. Unreasonable selection of feeder

Ball mill feeders include drum-shaped, scroll-shaped and combined feeders. If the feeder is unreasonably selected, the sealing device of the feeding pipe is not adequate, and the installation accuracy is inaccurate, it may cause the feed port to spit out material and leak slurry. .

3. The amount of steel balls in the cylinder is unreasonable

We know that the working principle of the ball mill is to use the steel balls in the cylinder to grind and hit the materials through the continuous rotation of the cylinder, so as to dissociate the materials. Therefore, the steel balls will become smaller due to continuous grinding. When the filling rate of the steel balls in the cylinder is insufficient and cannot work properly, the material will not be fully ground. Similarly, if there are too many steel balls in the cylinder, it will also It will cause the material to flow out from the feed port or leak slurry.

4. Steel balls are of poor quality

The quality of the ball mainly refers to the density and impact and abrasion resistance of the ball. If the density is small, the impact on the ore is small, the energy is insufficient, and the destruction effect is not good. If the hardness is low, the peeling force will be small, and it will be brittle and not resistant to impact. Many broken balls are produced in the grinding machine, which not only has poor grinding effect, but also affects the normal function of other balls, reduces the damage effect on the ore and causes the grinding mill to "bulge". Therefore, the selection of steel balls and reasonable ball loading principles are important factors to ensure the stable operation of the mill.

How to deal with material spitting and slurry leakage at the feed port of ball mill

Based on the above four reasons, we need to choose the feeder scientifically and rationally. Among them, the structure of drum-shaped, scroll-shaped and combined feeding devices can avoid the phenomenon of slurry leakage at the feed point;

The filling rate of steel balls ranges from 40% to 45%. The upper limit of the medium filling rate of a wet ball mill will decrease as the diameter of the ball mill increases. For a ball mill with the same diameter, the upper limit of the medium filling rate will decrease as the length of the barrel increases. Therefore, it is recommended to select a qualified testing institution to conduct the test and give a reasonable filling rate. Also be careful to choose good quality, wear-resistant steel balls.