Open AccessINFLUENCE OF POROUSNESS OF GRINDING MEDIA OF A BALL DRUM ON DISPERSE CHARACTERISTICS OF CLINKER
Author(s) -
Иван Борисов,
Иван Борисов,
А. Стронин,
А. Стронин,
Виктор Классен,
Виктор Классен
Publication year - 2019
Publication title -
vestnik bgtu im. v.g. šuhova
Language(s) - English
Resource type - Journals
ISSN - 2071-7318
DOI - 10.34031/article_5d4d30eadca666.64629058
Subject(s) - fineness , grinding , mill , ball mill , separator (oil production) , cement , materials science , mechanical engineering , process engineering , closed circuit , clinker (cement) , roller mill , pulp and paper industry , engineering , environmental science , metallurgy , electrical engineering , portland cement , physics , thermodynamics
Currently, most cement mills operate in a closed circuit. Installing a separator without a significant modernization of the mill allows to increase its productivity (by about 20 %) and improve the grain size distribution of the cement; therefore the improvement of the separation process, especially abroad, is of great importance. The advantage of converting a mill to a closed circuit is not limited to the above described positive sides. The separator allows to reduce the weighted average diameter of the ball and the degree of adhesion of the material, provides the ability to control the fineness of cement without changing the range of grinding bodies. As a result, the efforts of scientists are directed towards improving the design of separators, while they usually do not pay enough attention to the main characteristics of the grinding load and adjust them considering the presence of separation system. Many scientists have established the fact that the optimal composition and characteristics of the grinding load can increase the productivity of the ball mill by 10–20 % without reducing the fineness of the cement grinding. Switching the mill to a closed circuit while using a rational grinding load, both in the first and in the second chamber will achieve an additive effect of increasing the energy efficiency of the grinding unit. The authors of this article pay special attention to the packing density of grinding media in the second chamber, because the increase in the value of this indicator does not always lead to a positive effect. On the basis of experimental data, the article proves the absence of an unambiguous relationship between the porousness of the grinding load under equal conditions and the value of the parameters characterizing the fineness of grinding.