摘要
毒砂氧化溶解和释放的砷将对周围水体造成污染。本文用混合流流动反应器研究了毒砂在温度为 15、2 5、35和 4 5℃的FeCl3 酸性地表水作用下的氧化溶解过程。结果显示 :在温度为15～ 35℃内 ,毒砂的氧化随FeCl3 溶液浓度增加和反应温度升高而加速 ,而 4 5℃时毒砂的反应速率反而降低 ;毒砂在与氧化剂FeCl3 酸性溶液 (浓度小于 1× 10 - 4mol·kg- 1)反应时释放到溶液中的砷为As(Ⅲ ) ,As(Ⅲ )在FeCl3 酸性溶液中很快被氧化成As(Ⅴ )。
The contamination of water by arsenic might result from oxidation of arsenopyrite. In this paper, the oxidation and dissolution process of arsenopyrite was run under the action of acidic surface water in the temperature range of 15～45℃ by using the mixed-flow reactor. The results show that the oxidation process of arsenopyrite is speeded up with increasing concentration of FeCl 3 solution and rising temperature of reaction within the temperature range of 15～35℃, whereas the reaction rate of arsenopyrite is reduced at 45℃, and that the arsenic released from the reaction of arsenopyrite with FeCl 3 acidic solutions whose concentration is lower than 1×10 -4 mol·kg -1 is in the form of As(Ⅲ), which is likely to be soon oxidized into As(Ⅴ) in the FeCl 3 acidic solution.
出处
《岩石矿物学杂志》
CAS
CSCD
北大核心
2001年第4期409-413,共5页
Acta Petrologica et Mineralogica
基金
国家自然科学基金资助项目 (4 97732 0 2 )
中国科学院地球化学研究所矿床开放研究室创新项目
