Balls (high chromium ball) an important role in improving the mill output

The ball mill as a universal grinding equipment, is widely used in mineral processing, building materials and chemical industries, and the ball mill can be divided into dry and wet the two grinding of ways. According to the different ways of discharge can be divided into lattice-type ball mill and overflow ball mill two.

      A ball mill production problems

Generally speaking, a direct way to improve mill output of three kinds:
     1. Home crushing machine in front of the mill;
     2. Improved grinding system, improve grinding efficiency;
     3. Plus home efficiency classifiers.

    As we all know, the ball mill, the material to be broken, and then to smash the key equipment. It is widely used in cement, silicate products, new building materials, fertilizers, non-ferrous metal beneficiation and glass-ceramic production industry, and a variety of ores and other grind-able materials dry or wet grinding. Before grinding crushing the premise is to ensure that the powder after grinding, mill transformation is essential. Into the grinding mill before crushing makes material particle size greatly reduced, thereby reducing the load of the grinding system; efficiency of the powder, the most direct benefit is the finished fine powder to maximize the timely elect to reduce the rate of cement products back powder, reduce mill load; transformation mill is grinding system improvements, is one of the most fundamental solution. Into the grinding material size reduction, the classifier efficiency the grinding system less efficient, not only affect the ball mill production, but also affect the quality of the product.

      Second, to improve mill output

1, the grinding process
    After the study, does not consider grinding before crushing, grinding process two types: open and circle streams. Under the same conditions, the circle abortion than to open stream high by about 20-35%. Circle stream products, the particle distribution is more uniform, more convenient to adjust the cement grade; open flow of the grinding mill material that is finished, the product of the particle composition distribution is more dispersed, there overgrinding phenomenon, affecting the quality and yield of the cement. Open circuit mill cement particle size distribution uniformity coefficient is generally 0.8-0.9, and some even lower, only 0.7, the particle size distribution is very wide.
2, into the grinding material size
    Engineering and technical personnel at home and abroad due to the mill dry grinding energy utilization rate is only 2 to 3%, after years of scientific research and production practice, proposed a "multi-break less grinding to break instead of grinding" pre-grinding process The substantial increase in production, the mill grinding power consumption is also significantly lower yield good energy saving effect. Reduced to the so-called "pre-grinding process is the granularity of the material into the mill from the original 20-25mm 3-5mm, ball mill the Ⅰ positions of work transferred to the crusher, in order to achieve the purpose of improving the mill output. The points in the product size, product particle size will generally be less than the 3-5mm crusher called the crushing crushing machine (referred to as the crushing machine). Used crushing crusher jaw crusher, hammer crusher, roll crusher, compound crusher, impact crusher.
2, into the grinding material moisture content and temperature
    First, it should be noted that the material into the mill water is not more wet as possible, the finer the cement fineness, more sensitive to moisture, moisture undesirable should paste ball paste grinding. Generally believed, the materials integrated water into the mill for every 1% increase in mill output will be reduced by 10%. When the moisture content is greater than 5%, the mill on the basic "stop" grinding.
4, ball mill cylinder of ventilation
Ball mill internal ventilation conditions good or bad, directly affect the play of the grinding efficiency, open circuit mill and take the natural pull Wind mill common problem. The role of ventilation First timely the mill fine powder discharge, so as not to affect the grinding efficiency; reduce the temperature inside the mill, to avoid dehydration of gypsum and tail positions paste ball blocking grate. When the material moisture content is too large and the mill poorly ventilated, the mill water vapor emissions is difficult, not only wet fine powder adhesion blocking grate seam, reducing material throughput and flow rate per unit time. The same time, these grinding grinding of materials due to electrostatic reasons but also in the lining work surface attached to form a "cushion gum, resulting in grinding body material impact crusher features greatly weakened.
5, ball mill liner
Mill structure mill the cylinder liner, grate plate compartment plate and into a feeding device. Mill liner is used to protect the cylinder to avoid grinding bodies and the direct impact and friction of the material of the cylinder, followed by grinding body in various positions within the state of motion can be adjusted to different types of liners.