Dai Mengbo, Zhou Yongcheng, Xiao Qingfei, Lv Jinfang, Huang Lingyun, Xie Xian, Hu Yiming, Tong Xiong, Chun Tiejun
School of Metallurgical Engineering, Anhui University of Technology, Maanshan 243032, China.
Faculty of Land and Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China.
Materials (Basel). 2023 Oct 26;16(21):6884. doi: 10.3390/ma16216884.
Extracting iron while minimizing the health and environmental risks associated with arsenic contamination necessitates the removal of arsenic from arsenic-bearing iron ores to ensure a safe and sustainable supply of this metal for industries. The beneficiation of iron minerals and arsenic-bearing minerals from arsenic-bearing iron ores with a calcification-magnetizing roasting and low-intensity magnetic separation (CMR-LMS) process is investigated in this work. The results show that the process is successful in extracting iron minerals and eliminating arsenic-containing minerals. The roasting involves two key steps: calcification and magnetizing, which change hematite and goethite into magnetite and arsenic-bearing minerals into calcium arsenates. The process's separation efficiency of the CMR-LMS is closely linked to the parameters such as roasting temperature, roasting time, coke, alkalinity, and the liberation of gangue minerals from iron minerals. Through grinding and secondary magnetic separation, the iron minerals and gangue components, as well as arsenic, in roasted sand can be further separated. The optimum procedure results in a high-grade iron concentrate with an iron assay of 65.65%, an Fe recovery rate of 80.07%, and an arsenic content of 0.085%, while achieving a 93.29% As removal rate from the original ore that has 45.32% Fe and 0.70% As.
在将与砷污染相关的健康和环境风险降至最低的同时提取铁，需要从含砷铁矿石中去除砷，以确保为工业提供安全且可持续的这种金属供应。本文研究了采用钙化磁化焙烧-弱磁选（CMR-LMS）工艺从含砷铁矿石中选别铁矿物和含砷矿物。结果表明，该工艺成功地提取了铁矿物并去除了含砷矿物。焙烧包括两个关键步骤：钙化和磁化，这将赤铁矿和针铁矿转变为磁铁矿，并将含砷矿物转变为砷酸钙。CMR-LMS工艺的分离效率与焙烧温度、焙烧时间、焦炭、碱度以及脉石矿物与铁矿物的解离等参数密切相关。通过研磨和二次磁选，焙烧砂中的铁矿物、脉石成分以及砷可以进一步分离。最佳工艺得到的铁精矿品位高，铁含量为65.65%，铁回收率为80.07%且砷含量为0.085%，同时从含铁45.32%和砷0.70%的原矿中实现了93.29%的砷去除率。
