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Advances in Materials Science and Engineering
Volume 2015, Article ID 938176, 12 pages
http://dx.doi.org/10.1155/2015/938176
Research Article

Industrial versus Laboratory Clinker Processing Using Grinding Aids (Scale Effect)

Holderchem Building Chemicals, P.O. Box 40206, Baabda, Lebanon

Received 14 September 2015; Accepted 11 November 2015

Academic Editor: Luigi Nicolais

Copyright © 2015 Joseph Jean Assaad. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The evaluation of grinding aid (GA) effect on clinker processing in laboratory grinding mills is relatively simple. Yet, the results obtained cannot be directly transposed to industrial mills, given the fundamentally different operational modes and grinding parameters. This paper seeks to evaluate the scale effect by comparing the results obtained from a closed-circuit tube mill operating at 90 ton/hr to those determined using a 50-liter laboratory mill. Tests results have shown that the decrease in specific energy consumption (Ec) due to glycol or amine-based GA can be evaluated under laboratory conditions. However, such tests underestimate the actual performance that could be achieved in real-scale mills; the Ec reduction due to GA is around twofold higher when grinding is performed in real-scale mill. Compared to industrial tests, the cement particle size distribution curves widened and shifted towards higher diameters when grinding was performed under laboratory conditions, particularly with GA additions. This led to remarkable changes in water demand, setting time, and 1- and 28-day compressive strengths.