materials handling 9


Fig. 2. Schematic of a cement finishing circuit.


separator splits off the final product cut, recycling over- sized material back to the mill for further grinding. Similar technology is employed to process replacement materials. Traditionally these circuits are manually operated, with reference to laboratory Blaine measurement. The operator takes a sample every one to two hours, receives the analytical results some time later and takes corrective action.


– a much more punishing outcome. A strategy of over-milling, to compensate for poor control, is extremely common. Unfortunately over-milling has significant implications for energy consumption. Milling is always a relatively inefficient process, with less than 5 per cent of applied energy going into particle break-up.


R


The simplest and least expensive way of bringing laser diffraction analysis into the process environment is via at-line instrumentation.


Automated at-line systems allow the operator to pour in a sample of material, as and when information is required for control, making analysis more responsive to operational demands.


Laser diffraction systems such as the Insitec Cement Labsizer from Malvern Instruments are ideally suited for this type of application. They can measure cement samples of all types, in both a fully automated or a manual laboratory with sample sizes as small as 5 g, or up to 150 g.


Integrating analysis and production with a conventional at-line system or fully automated laboratory tends to improve the effectiveness of either manual or automated operation, thereby reducing production costs. m


Alain Blasco is Process Specialist – Key Account Team, Malvern Instruments, Malvern, Worcestershire, UK. www.malvern.com


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educing the particle size of the cement too much, within limits, tends to simply improve its quality, but an overly coarse product will fail to meet the specification


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