溶融 Sb-X (X : Fe, Co, Ni) 2 元系合金中のアンチモンの活量測定

概要

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In order to obtain fundamental information about the behavior of antimony speiss produced in the smelting process of antimonide ores, the activities of antimony in the Fe-Sb, Co-Sb and Ni-Sb binary systems were measured using the transportation method between the temperature range 1273 and 1473 K. The equilibria among the gas species of Sb, Sb_2 and Sb_4 were applied in the calculation of vapor pressure of antimony. The obtained activity of antimony in the Fe-Sb system shows a negative deviation from the Raoult's law in the composition range of less than 70 at%Sb, but deviated positively above this point, while a negative deviation is observed throughout the composition range in the Co-Sb and Ni-Sb systems at 1473 K. The degree of the negative deviation of the antimony activities from the Raoult's law increases in the order of Fe-Sb, Co-Sb and Ni-Sb systems. By assuming a homogeneous solution in the two phase region of low antimony content, the values of 0.2,6×(10)^<-2> and 3×(10)^<-3> are estimated for γ_<Sb> in the Fe-Sb, Co-Sb and Ni-Sb systems respectively.Fe-SbCo-SbNi-Sbactivityvapor pressuretransportation methodspeissantimony
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