Xu Miao, Li Lei, Mao Kai Xuan
State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Engineering Research Center of Metallurgical Energy Conservation and Emission Reduction of Ministry of Education, and Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China.
ACS Omega. 2019 Apr 17;4(4):6968-6976. doi: 10.1021/acsomega.9b00536. eCollection 2019 Apr 30.
As-Sb dust from metallurgical processes causes serious environmental issues due to the presence of the toxic element As. In this study, a facile method for removing As through the destruction of the As-Sb solid solution structure from the dust using CaO under an oxidizing atmosphere was processed. The effects of the variables, including the amount of CaO added, roasting temperature and time, and oxygen partial pressure, on the volatilization of As and Sb were investigated. Under an oxidizing atmosphere in the presence of CaO, the formation of the vitreous material (As-Sb-O) was hindered through the transformation of SbO and (As, Sb)O in the untreated dust into SbO, SbO, SbO, and CaSbO, and the volatilization of arsenic was promoted, as a result. The volatilization attained for As was 91.53% whereas that for Sb was only 4.30% under the following optimum conditions: 5 mass % CaO, a roasting temperature of 550 °C, an O partial pressure of 21 vol % (air), and a roasting time of 80 min.
冶金过程中产生的砷锑粉尘因含有有毒元素砷而引发严重的环境问题。本研究采用一种简便方法，即在氧化气氛下利用CaO破坏粉尘中的砷锑固溶体结构来去除砷。研究了包括CaO添加量、焙烧温度和时间以及氧分压等变量对砷和锑挥发的影响。在氧化气氛和CaO存在的情况下，未处理粉尘中的SbO和(As,Sb)O通过转化为SbO、SbO、SbO和CaSbO，从而阻碍了玻璃态物质(As-Sb-O)的形成，结果促进了砷的挥发。在以下最佳条件下：5质量%的CaO、焙烧温度550℃、O分压21体积%（空气）、焙烧时间80分钟，砷的挥发率达到91.53%，而锑的挥发率仅为4.30%。
