セメント調合原料の迅速分析法へのケイ光X線の利用

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Rapid determination of iron, silicon and aluminum in raw material clays and of calcium in limestone and slurry have been investigated by fluorescent X-ray method. Every specimens were prepared by pressing the powder in an aluminum ring for rapidity of operation.<BR>1. Accuracies in determinations of iron and calcium were as high as those in chemical analyses (Fig. 1, 2, Table IV).<BR>2. The results on calcium determination were independent on differences in the brand of limestone. A calibration curve could be commonly used for limestone and slurry (Fig. 2).<BR>3. Determination of silicon and aluminum was interfered by coexisting iron when ADP was used as the analyser crystal (Fig. 3, 4, 5). This was overcome by narrowering the slit width of pulse hight analyser. Or, in case of silicon, a correction factor obtained from multiple regression was introduced to give σ=0.286%. A combined use of both procedures gave better result.<BR>4. Small variations in results for silicon and aluminum on each tablet preparation (Table V) indicated the necessity of repeated samplings. The might have been due to the extremely thin estimating layer of SiKα and AlKα (Table VI).
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