PROGRESE IN TEHNICA MACINARII CIMENTULUI PORTLAND

摘要

At a global level, comminution processes engulf 2.8-3.4% of the overall electric power generation, with the cement industry share being quite important (0.77%). The above considerations have triggered much upgrading in grinding plants in order to reduce electric power consumption. Portland cements resulted from coarse grinding in high-pressure grinding rolls previously to finished grinding in ball mills feature unaltered properties and convincing benefits regarding the production rate of grinding plants and the energy consumption. Fine grinding of Portland cements in any type of mill is enough ground for uncontrolled and unacceptable changes to arise in the performance of such cements, with such cements being found to have inconsistent workability as well as altered properties at placing, namely, the water demand for a convenient consistency in processing subsequent binding mixes, the rheological properties, and the performance at hardening—the setting time and early strength. Introduction of high performance separators entails electric power saving at grinding, augmented still by an improvement in the finished product quality as owing to a better particle size distribution and a lower temperature of the cement obtained.