The final step in cement production is the grinding of
clinker with gypsum and supplementary materials (blast furnace slag, fly ash…).
Clinker is an intermediate product, formed in a rotary kiln
at 1450°C. The particle size distribution of the clinker depends on the
conditions in the rotary kiln. As many different fuels are used, kiln
conditions can change quickly and therefore the particle size distribution of
the clinker. Of course the particle size distribution (PSD) of the clinker has
an effect of the mill, where the clinker is ground together with gypsum to a
PSD < 45 µm. In order to ensure a reliable and smooth mill operation it is
of particularly interest to have an information of the PSD of the incoming
clinker. With these information the operator can choose the optimal settings of
the cement mill to maintain a homogenous product quality and a high throughput.
An automated image recognition of the PSD of the clinker would
be a huge benefit as these data can be supplied to the process control of the
cement mill and the necessary parameters can be adjusted automatically.
Download PDF for sample images.