Einige probleme des einsatzes von mahlhilfsmitteln in der zementindustrie

Abstract

Experiments were carried out to investigate the effect of grinding aids upon the finess and other properties of ground cements. The examinations were made partly in a laboratory ball mill and in an industrial tube mill; triethanol amine, a polyvalent alcohol and residues of glycol synthesis were used as grinding aids, in amounts of 0,01 – 0,05% and added in drops or as a spray. It is concluded that industrial conditions can well be modelled by the laboratory mill. The addition of grinding aids increases the fitness and decreases the sticking of the cement; Bond's work index remains unaffected. Optimum amount of addition is approximately 0,035%; simple dropping is almost as effective as spraying. The dust becomes finer and its quantity increases by 50–70% by grinding aids. The grinding aids content in the exhaust air of the mill can be neglected.