<報文>銅-鉄-イオウ系溶融マット中のヒ素の活量

概要

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The activity of arsenic in the liquid copper-iron-sulfur mattes was measured by the isopiestic method over the temperature range, 1000 to 1115℃, and the concentration range of arsenic, N_<As>=0.003 to 0.06. The measurements were carried out for five different copper grade mattes corresponding to the Cu_2S-FeS pseudo-binary system (A-type), and for the other two sulfur-deficit mattes in which the values of iron activity were substantial (B-type). The activity of arsenic in the A-type mattes represents a large, positive deviation from Raoultian behavior, and the values of the activity coefficient at infinite dilution range from 7.7 to 22.0 at 1100℃, according to the matte compositions. On the other hand, the activity of arsenic in the B-type mattes represents a slight, positive deviation from Raoultian behavior when N_<As> is less than 0.01,but it increases drastically in the high concentration range of arsenic. By taking account of the iron activity in the mattes, the anomalies observed in the A- and B-type mattes can be explained reasonably. Based on the activity coefficient data determined in this work, the elimination of arsenic from the mattes in copper smelting processes is discussed.
東北大学の論文
1979-09-22