The trend in the cement industry toward large grinding mills, kilns, and kiln feed storage facilities has emphasized the need for continuous on-stream control of the chemical composition of the raw mix. This paper describes a sampling and control system in which the chemical composition of the solids in a continuous sample of flowing slurry is monitored by X-ray emission techniques. The chemical composition is used by a raw mill blending and control program to adjust feed rates of the raw material streams entering the raw grinding mill. A more uniform product in terms of certain chemical and physical properties of the cement has resulted from the combined performance of the X-ray sampling and control system, the kiln, and the finished cement grinding system.
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