鋼試料自動溶解方法および装置

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As one of the studies on automation of the chemical analysis of steel samples, an automatic method and apparatus for dissolving steel samples have been developed. The dissolving operation is the most common among the four main unit-operations of iron and steel chemical analysis, weighing, dissolving, determining and calculating operations. The dissolving operation, now manually carried out, is laborious and time-consuming.<BR>The schematic diagram of the apparatus is shown in Fig. 1. The samples in the test tubes on the turntable sample changer are transferred in turn into the reaction vessel by vacuum suction. The samples are dissolved by adding concd. hydrochloric acid (35%) and hydrogen peroxide (30%) by means of the solution adding device (Fig. 2). The experimental details are shown in Table I. The whole solution is heated to complete the dissolution and to remove the remaining hydrogen peroxide. The prepared sample solutions are finally transferred to the beakers through the drain cock. The above-mentioned whole operations are automatically and successively carried out in accordance with the program on the sequence programmer. One cycle of the program is 5 minutes per sample, and its detail is shown in Fig. 3.<BR>The results of the dissolving test on steel samples are presented in Table II, which shows that less than 0.3 g of steel samples of various kinds are easily dissolved except tungsten bearing samples.<BR>The analytical results of nitrogen, silicon and aluminum in steel samples are shown in Table III. Nitrogen and silicon were determined spectrophotometrically by the bispyrazolone method and molybdenum-blue method, respectively, after the samples are dissolved by the present apparatus. Aluminum was determined by atomic absorption spectrophotometry. The analytical results agree well with those obtained by the manual techniques.<BR>The present apparatus can be easily connected with an automated atomic absorption spectrophotometer and automated spectrophotometer.
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鋼試料自動溶解方法および装置

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