Reasons for the ball mill to spit from the feed port

Vomit reason mill feed from the feed mill is a serious "bloating." If the overflow ore mill has large ore and steel balls spit out from the inlet and discharge ports, it is called “pre-spit and pull-back”; or the lattice ball mill has a large amount of slurry with nuggets and steel balls. The pouring of the material is such a phenomenon that the ball mill is "swelling" when it is severe.

Reasons for causing the ball mill to "swell" after the meal:

In addition to the improper operation is the main cause of the "swollen belly" of the grinding machine, the unreasonable ball loading system is also the main factor causing the mill to "swell up". The so-called ball loading system, including the number of ball loading (filling rate), the ball class (the size of the ball and the ball ratio of the ball, the quality of the ball and the reasonable addition of the ball in production to maintain the balance (additional quantity, additional The size and proportion of the ball) and so on.

1. The ball is not added on time in the mill, and the filling rate is low.

In order to make the mill have better grinding effect, it is necessary to maintain a suitable ratio of material to ball in the mill (the ratio of the ball is different for different situations, mainly in the actual production). In the production, it is not possible to add enough balls in time to supplement the consumption of the grinding process, so that the ball volume in the mill is small, (the filling rate is insufficient), and the result is that the ball has less material and the medium energy required for pulverizing the material is insufficient. The material fed in can not be pulverized in time and discharged into the grinding machine, which gradually accumulates in the mill and causes "bloat". ,

For example, contact several classes without adding steel balls, and then add them once in a concentrated way. This will cause the internal ball ratio of the mill to be in an unstable state. The proportion of steel balls is small, the grinding effect is not good, and the mineral dissociation degree is not enough. Affects mineral recovery or concentrate quality. When the proportion of steel balls is large, the over-grinding phenomenon increases, which not only causes poor recovery of minerals, but also increases steel ball wear.

2. The ratio of steel balls is unreasonable

A reasonable ratio should be compatible with the particle size composition of the material to be ground in order to have sufficient impact, extrusion and grinding action. If the ratio is out of balance for various reasons, the ball is small and the ball is small, the impact of crushing the coarse ore is insufficient, and the coarse particles cannot be made smaller in time, resulting in the accumulation of large ore particles; while the small ball is small and the ball is large. Although the impact force is enhanced, because at a certain filling rate, the large number of balls is large and the total number of balls is reduced, and the grinding and stripping effect is weakened, which may result in poor grinding effect. The ore particles cannot be ground and discharged in time, and the swelling is caused. ".

3, the quality of the ball is poor

The quality of the ball mainly refers to the density and impact resistance and abrasion resistance of the ball. If the density is small, the impact on the ore is small, the energy is insufficient, and the pulverization effect is not good. If the hardness is low, the grinding and peeling force is small, and the brittleness is not resistant to impact. A lot of broken balls are produced in the grinding machine, which not only has poor grinding effect, but also affects the normal action of other balls, and reduces the crushing effect on the ore, causing the mill to "swell up". Therefore, the use of high-quality steel balls and reasonable ball loading system is an important factor to ensure the stable and efficient operation of the mill.

4, the feeder itself is faulty

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