ハマスレーペレット中のりんの存在形態について

概要

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There were differences among the 29 analytical values of phosphor in the Hamersley pellet obtained in nine laboratories by means of the JIS M 8216 (1964) method ; the values obtained were classified to either 0.050±0.005% or 0.019±0.004%. By the investigation of the cause of the difference, it was made clear that the analytical value of phosphor became about 0.050% when the residues after acid dissolution were treated by an alkali fusion process, about 60% of the total phosphor in the pellet remained in the residue insoluble with inorganic acids. In this paper, the process by which the phosphor in Hamersley iron ore became insoluble in inorganic acids during firing the pellet was especially investigated by the combined use of chemical and X-ray analyses. It was shown that the phosphor in Hamersley iron ore became soluble into the α-cristobalite formed at high temperature, which then formed stable glass insoluble in inorganic acids together with the elements of Al, Ca, and Fe. There were no other examples which gave an anomalous value except the Hamersley pellet.
1973-03-01