高砷锑烟尘浸出毒性研究

为了评价高砷锑烟尘对环境的影响,模拟酸雨、淡水、盐碱地等自然环境,采用去离子水、硫酸-硝酸混合溶液、醋酸缓冲溶液、NaOH溶液(pH=10、pH=11、pH=13)6种浸出剂测定了As、Sb的浸出毒性。结果表明,浸出温度20 ℃时,在去离子水、硫酸-硝酸、醋酸和NaOH体系中As最低浓度分别为1.66、1.62、0.82和1.59 g/L,最高浓度分别为2.13、2.11、1.13和2.77 g/L;Sb最低浓度分别为2.65、2.36、0.41和0.53 g/L,最高浓度分别为2.96、2.68、0.72和2.98 g/L。随着浸出温度升高,浸出液中As、Sb浓度更大。

Leaching Toxicity of Arsenic Antimony Bearing Dust

Leaching toxicity of As and Sb was respectively measured using 6 leaching agents, including deionized water, sulfuric acid-nitric acid solution, acetic acid solution, NaOH solution (pH=10, pH=11, pH=13), by simulating natural environmental condition, including acid rain, fresh water and saline alkali land, so as to evaluate impact of high arsenic antimony bearing  dust on environment. Results showed that after leaching at 20 ℃, in deionized water system, sulfuric-nitric acid system, acetic acid system and sodium hydroxide system, the lowest concentration of As was 1.66, 1.62, 0.82 and 1.59 g/L, respectively, while the highest concentration was 2.13, 2.11, 1.13 and 2.77 g/L, respectively. While the lowest concentration of Sb was 2.65, 2.36, 0.41 and 0.53 g/L, respectively, and the highest concentration was 2.96, 2.68, 0.72 and 2.98 g/L, respectively. It is shown that both the concentrations of As and Sb in the lixivium are increased with the rising of temperature.