添加硫化铜选择性氧化-硫化焙烧分离砷锑烟尘中的砷

Separation of arsenic from arsenic-antimony-bearing dust through selective oxidation-sulfidation roasting with CuS

以Cu S为添加剂对砷锑烟尘进行焙烧可实现其中砷的有效脱除,过程中Sb转化为Sb2O4与Sb2S3,保留在底物中,As则以As4O6形式挥发。借助XRD、EPMA和SEM-EDS等表征手段,对焙烧温度与Cu S加入量对砷分离效率的影响规律进行研究。结果表明,Cu S对砷的分离有促进作用,其原因为:Cu S可将(Sb,As)2O3固溶体结构破坏,使其中As以As4O6形式挥发脱除。焙烧温度为400°C、Cu S用量为130%时,砷锑烟尘中砷的挥发率高达97.80%,锑挥发损失率仅为8.29%。同时,高砷挥发物被氧化后可用于制备砷酸铁以实现其无害化处理。

The feasibility of a new method for separating arsenic from arsenic-antimony-bearing dusts using Cu S was put forward,in which Sb was transformed into Sb2O4 and Sb2S3 that stayed in the roasted calcine while As was volatilized in the form of As4O6.The factors such as roasting temperature and Cu S addition amount were studied using XRD,EPMA and SEM-EDS.Cu S has an active effect on the separation of arsenic due to the destruction of(Sb,As)2 O3 structures in the original dust and the simultaneous release of As in the form of As4O6.At a roasting temperature of 400°C and Cu S addition amount of 130%,the volatilization rates of arsenic and antimony reach 97.80 wt.%and 8.29 wt.%,respectively.Further,the high As volatile matter can be used to prepare ferric arsenate after it is oxidized,with this treatment rendering the vapor harmlessness.