In most case calcium carbonate fillers with particle size less than 10 micron are in great demand in the market. Our ball mill is specially designed for such applications. It is quite different from the tube mill that some people use for so-called fine grinding. 1，Our ball mill has an optimized D/L ratio that can effectively avoid over-grinding. 2，The grate discharge design allows to use smaller grinding media. 3，The higher loading of cylpebs together with our designed grinding mechanism results in high grinding efficiency with lower grinding energy. 4，At the end of the mill there is a suction opening in stead of a filter, which makes it environment friendly. 5，Additionally, ball mill grinding gets a wide range of particle size distribution with more fine content, so it is easy to separate products smaller than 10 µm products with a classifier to meet the required fineness for a variety of application. 6，The sturdy construction and lower running speed with lower maintenance cost make it an economic device for fine or ultra-fine grinding of mineral fillers. All these advantages determine the ball mill priority positions in the market of mineral fillers processing.