Ball Mill For Grinding Cement Unit
For the majority of the twentieth century, the dry grinding circuits for that production of completed cement from cement clinker include two-compartment tube mills and the air separators. It isn't uncommon to deliver the cement in an open circuit. Advances in cement grinding engineering is slow and these advances are limited to more developed countries. About 95% of your feed to the cement grinding circuit are clinker and the rest of your feed are additives which consists of grinding aids. The superior of cement is measured by the surface space or the Blane index. The unit of your Blane index is O/kg, and this index is established by the Blane air permeability test. The surface space of your cement powder will depend on dimension distribution of cement particles; smaller particles have bigger surface spot. In the event the particle dimension distribution is known, the Blane index could be effectively predicted.
The cement clinker grinding circuit minimizes the feed from 80% passing dimension between ten and twenty mm to 100% passing 90 microns. The dimension reduction requires position in a two-compartment tube mill; the initial compartment of your mill is shorter than the 2nd compartment. The coarse clinker is ground inside the very first compartment the place greater balls (80, 60, 50 mm) are employed along with the fine grinding is accomplished in the second compartment the place smaller sized balls (beneath 25 mm) are utilized. A diaphragm (see Figure one) separates the two compartments and enables only particles beneath a particular size to pass to the 2nd compartment. Ground materials exits the mill with the discharge grate which prevents grinding balls from leaving the mill. A proportion of materials, largely fines, is air-swept from the mill. The final item will be the fine fraction from the air classifier as well as the coarse fraction returns on the mill.