Phase Relations and Activity of Arsenic in Cu-Fe-S-As System at 1473 K
Phase Relations and Activity of Arsenic in Cu-Fe-S-As System at 1473 K
复制标题
1473 K Cu-Fe-S-As 体系中砷的相关系和活度
DOI：
10.2320/matertrans.42.2427
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
K. Itagaki
中科院分区：
文献类型：
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作者：
D. G. Mendoza;M. Hino;K. Itagaki
为了分析砷在铜冶炼过程中的行为，分别用猝灭法和双努森胞质谱法测定了1473K下含砷的铜-铁-S-砷系混溶间隙中的相关系和砷的活度。对不同砷含量、质量比分别为0.023、0.023、0.059、0.098和0.131的铁铜混溶间隙中的电荷进行了实验研究。活度测量表明，金属相和冰铜相中的砷活度都表现出与理想行为的极大负偏差。在无限稀释下，金属相和冰铜相的Raoultian活度系数与混相间隙中的电荷几乎不变，金属相和冰铜相的Raoultian活度系数分别为4.3×10-3和5.5×10-2。根据测定的活度系数计算了气相中主要的As、As2和AsS组分在与不相容溶液平衡时的蒸汽压，即使当金属相中的砷含量增加到10%时，它们在小于Ipa的范围内也很小。
To analyze the arsenic behavior in the copper smelting process, the phase relations and the arsenic activity in the miscibility gap of Cu-Fe-S-As system with arsenic as a minor element have been determined at 1473 K by the quenching method and the double Knudsen cell-mass spectrometric method, respectively. The experiments have been conducted for the charges in the miscibility gap with mass%Fe/mass%Cu ratios of 0, 0.023, 0.059, 0.098 and 0.131 with varying arsenic content. The activity measurements indicate that the arsenic activities in both the metal and matte phases show extremely negative deviation from the ideal behavior. The Raoultian activity coefficients at infinite dilution in the metal and matte phases are found to be almost constant against the charges in the miscibility gap and they are 4.3 x 10 -3 and 5.5 x 10-2 for the metal and matte phases, respectively. The vapor pressures of predominant As, As 2 and AsS species in the gas phase equilibrated with the immiscible solutions have been calculated on the basis of the determined activity coefficients and they are very small at less than I Pa even when the arsenic content in the metal phase is increased up to 10 mass%.