摘要
通过红外光光谱测定、XRD检测等测试方法分析了稀土矿浸出过程中各种矿物表面性质的变化,稀土离子及铝、铁杂质离子与浸出剂和抑制剂的浸出交换过程及规律。结果表明,抑制剂的添加会与稀土矿中的铝、铁等杂质离子反应,形成化合物,从而降低浸出母液中铝、铁杂质离子含量,但不会影响离子型稀土的交换浸出过程。在机理分析的基础上,采用对铝铁杂质有高效抑制效果的抑杂剂LG-01进行离子型稀土矿抑制铝铁杂质的浸出实验研究。结果表明,在不影响离子型稀土矿稀土离子浸出率的情况下,LG-01能有效降低离子型稀土矿浸出母液中铝、铁等杂质离子含量,去除率可达92%。
Ion-absorbed rare-earth ore is an important mineral resource which is widely extracted by in-situ leaching process. And such process generates a significant amount of impurities such as aluminum and iron ions in leaching solution simultaneously. The surface characteristics and interactions by infrared spectroscopy and X-ray diffraction were studied to optimize the leaching conditions. It is found that the environment-friendly depressant LG-01 can react with the impurity ions through the formation of a new complex on the surface of leaching residues. Thus, it reduces significantly the concentration of impurity ions in leaching solution and improves the leaching rate of rare-earth ore. Moreover, a leaching rate of 95.6% and an impurity removal rate of 92% have been achieved under the optimized conditions.
基金
Project(51164010)supported by the National Natural Science Foundation of China
Project(2010GZC0048)supported by the Natural Science Foundation of Jiangxi Province,China
关键词
离子型稀土
浸出
抑制机理
铝铁杂质
ion-absorbed-type rare-earth ore
leaching
depression mechanism
aluminum and iron impurity