Three big “M”s

In fact, immediately most of you will probably think of money or mistakes, but in this issue we are more dedicated to mills and mill optimization and to very inconspicuous helpers working in extremely low concentrations, but with great effect – grinding aids.

As long as finished products are ground, mills and their approaches to optimization form a couple as Yin and Yang. Enormous tonnages per hour are moved to grind clinker and other constituents down to a grain size finer than a hair. Holistically a complex field is opened up, which we will describe in two case studies. One deals with the optimization of drives and process control in a VRM, while the other study describes the optimization of a ball mill, and a small investment to get the best result.

A relative new discipline which is emerging is the use of grinding aids. The contribution leads us to a comprehensive understanding of the recently known mechanism. Despite the fact that this field seems to offer more new approaches, at the Technical University of Munich the Center for Advanced PCE Studies is opened for research in greater depth.

The third “M” stands for market where we want to look at Brazil to learn what will come up after economical crisis and the boom of the World Cup.

Finally – of course, how can I ignore this – let us take a look on RDF, which is the solid alternative fuel for the calciner, in Part III of our AFR special series.

CFD simulations can sharpen the understanding of the preheating process and helps to avoid fundamental failure and damage during co-processing in the calciner. The basics of processes in the calciner, and their adaptation for the extensive use of RDF are also described. Modern equipment is now additionally available to employ still more exotic and much larger material like the high calorific fraction (HCF) or biomass to the pyroprocess than to pre-treat difficult feedstock down to 80 mm-RDF or even 30 mm-SRF.

We wish you a relaxing break in your daily work and an interesting reading ... and if not, then please sign the tracer and pass on to your colleague, who is eagerly awaiting this issue!

Dr. Hubert Baier
ZKG International


Related articles:

Issue 10/2010

Facilitating cement grinding in vertical mills

1 Introduction Mainly due to lower specific energy consumption (measured in kWh/t of material produced) and higher production (t/h) ­values, vertical cement mills are slowly, but steadily,...


Comprehensive understanding of ­grinding aids

1 Introduction Grinding aids have been used successfully for decades in cement production and many other areas, such as ceramics, pigments etc. The main effect is to reduce energy consumption and...

Issue 03/2011

Expert system for optimization of cement mills

1 Portland cement production in Rohrdorf At the Südbayerische Portland-Zementwerk in Rohrdorf, the raw materials extracted from the neighboring quarries that are necessary for producing Portland...

Issue 5/2021 SK500522019 (A3)

Method for grinding of material, especially raw material for clinker calcination, in mills, particularly in ball mills

(22) 23.10.2019 (43) 28.04.2021 (57) A method of grinding material, in particular a raw material mixture for firing clinker in mills, in particular ball mills, in a tubular ball mill with or without...

Issue 4/2017 AU 2015295865 (A1)

Method for grinding cement clinker

(22) 16.07.2015 (43) 02.02.2017 (57) Method of grinding cement clinkers comprising at least two kinds of clinker phases with differing grindability, comprising the steps: – feeding the cement clinker...