Correct use of Silica Sand Grinding Mill steel balls
The correct use of the Silica Sand Grinding Mill steel ball:
The newly installed Silica Sand Grinding Mill has a running-in process. During the running-in process, the steel balls are added in quantity, accounting for 80% of the large load of the Silica Sand Grinding Mill. The proportion of the steel balls can be added according to the steel ball size (Φ 120mm, & Phi; 100 mm, & Phi; 80 mm, & Phi; 60 mm, & Phi; 40 mm) size added. Different Silica Sand Grinding Mill models have different ball loadings. For example, MQG1500× 3000 Silica Sand Grinding Mill large load capacity 9.5 & mdash; 10 tons. The secondary addition of steel balls (120 mm and 100 mm) accounted for 30% & mdash; 40%, the medium ball 80 mm accounted for 40% & mdash; 30%, and the small balls (60 and 40 mm) accounted for 30%.
The steel ball is the medium used for the grinding material by the Silica Sand Grinding Mill. Its working principle is to impact and grind the material during the operation of the Silica Sand Grinding Mill, and grind the material into fine powder. The filling rate, loading capacity and grade of the steel ball have a significant impact on the production of the Silica Sand Grinding Mill and the quality of the product.
Filling rate of Silica Sand Grinding Mill steel ball
When the speed of the Silica Sand Grinding Mill is constant, the filling rate is too low, which will increase the sliding of the steel ball; if the filling rate is too high, the movement of the steel ball will lose the normal trajectory, and both will cause the grinding efficiency of the Silica Sand Grinding Mill to decrease.
Under the filling of good filling rate, the output of Silica Sand Grinding Mill is relatively high, the product fineness meets the requirements, and the power consumption per unit product is low.
The good filling rate of the steel ball is related to the type, specification, internal structural characteristics of the Silica Sand Grinding Mill and the performance of the material to be ground. Therefore, the best filling rate should be obtained through experiments and adjusted according to the degree of change of the influencing factors.
For the ball filling rate of the secondary closed-circuit Silica Sand Grinding Mill and the multi-cylinder Silica Sand Grinding Mill, it should be adjusted according to the balance state of each stage or each silo grinding action. For example, if a three-barrel Silica Sand Grinding Mill is insufficient in rough grinding ability and has a fine grinding ability, the filling rate of the bin should be appropriately increased to reduce the filling rate of the fine grinding bin, so that the grinding effect of each bin is relatively balanced. If you change the product variety or quality requirements, you should also consider adjusting the filling rate of the steel ball. The bulk density of steel balls is generally 4.56 to 4.85 tons / cubic meter.
Gradation of Silica Sand Grinding Mill steel ball
The reasonable selection of steel ball grading is mainly determined by factors such as the physical and chemical properties of the material to be ground, the grinding method and the required product fineness.
When the loading of the steel ball is constant, the small steel ball has a larger total surface area than the large steel ball, and there are many opportunities for contact with the material. Therefore, for the fine-grained material that needs to be ground, a small steel ball should be used, and a single large steel ball is smaller than a single steel ball. The energy of small steel balls is large, so large steel balls should be used for large materials that need impact crushing. The grinding material has good grindability, and a small steel ball can be selected. If the wearability is poor, a large steel ball should be used.
The diameter of the selected steel ball also has a certain relationship with the throughput of the material per unit volume in the mill. In closed-circuit grinding, the coarse grinding material of the classifier increases the throughput of the material per unit volume in the mill, so that the steel ball is subjected to a certain buffering effect during the impact. Therefore, the amount of recycled material is large, and the diameter of the steel ball is selected. Bigger, and vice versa. In addition, when the fineness of the material to be ground is required to be fine, the small steel ball should be appropriately selected, and vice versa.
Wear and supplement of Silica Sand Grinding Mill steel ball
In order to maintain a reasonable grading of the inner steel ball in the mill, attention should be paid to eliminating and weakening various factors affecting the damage of the Silica Sand Grinding Mill equipment.
When the hardness of the material to be ground is close to the hardness of the steel ball, the wear of the steel ball is large. Therefore, the steel plant is usually required to adopt an effective slag water quenching method to reduce the slag hardness. When grinding slag cement, the iron slag mixed in the slag should be removed.
The Silica Sand Grinding Mill operates without feeding materials or storing a small amount of material, and the damage of the Silica Sand Grinding Mill equipment is significantly increased. When there are more materials in the mill, the wear of the steel ball is relatively small, but when the material is too much, although the damage of the Silica Sand Grinding Mill equipment is reduced, the grinding efficiency will be reduced. When the particle size of the grinding material increases, the rough grinding bin is larger than the Silica Sand Grinding Mill of the fine grinding bin, and the fine powder on the surface of the steel ball of the fine grinding bin is adsorbed. The higher the rotational speed of the Silica Sand Grinding Mill, the greater the damage of the Silica Sand Grinding Mill equipment, and the damage of the Silica Sand Grinding Mill equipment increases as the filling rate of the steel ball increases. The material and composition of the steel ball have a significant impact on the damage of the Silica Sand Grinding Mill equipment.
In order to compensate for the wear of the steel ball, the Silica Sand Grinding Mill should be added regularly after running for a period of time. The period for determining the regular ball length shall be determined according to the time when the damage of the Silica Sand Grinding Mill equipment does not exceed 5% of the total load of the steel ball.