SEDL / STP / STP540-EB / STP34750S

Sampling and On-Stream X-Ray Control of Portland Cement Raw Mix Slurry

Moore, CW
Managerassistant plant manager, Production and Quality Control, Central Research LaboratoryLone Star Industries, Inc., HoustonGreencastleGreenwich, Tex.Ind.Conn.

Maars, CD
Managerassistant plant manager, Production and Quality Control, Central Research LaboratoryLone Star Industries, Inc., HoustonGreencastleGreenwich, Tex.Ind.Conn.

Pages: 13    Published: Jan 1973

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Abstract

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.