以辉钼矿(MoS_(2))、褐铁矿和无烟煤为原料,通过碳热还原法制备了MoS_(x)@ZVI复合材料。研究了MoS_(2)用量、焙烧温度、无烟煤用量和焙烧时间对MoS_(x)@ZVI去除酸性橙G(OG)的影响,并确定了制备MoS_(x)@ZVI的较优制备条件为焙烧温度1000...以辉钼矿(MoS_(2))、褐铁矿和无烟煤为原料,通过碳热还原法制备了MoS_(x)@ZVI复合材料。研究了MoS_(2)用量、焙烧温度、无烟煤用量和焙烧时间对MoS_(x)@ZVI去除酸性橙G(OG)的影响,并确定了制备MoS_(x)@ZVI的较优制备条件为焙烧温度1000℃、MoS_(2)用量6%、焙烧时间60 min和无烟煤用量25%。通过X射线衍射、扫描电子显微镜和能谱仪对较优条件制备的MoS_(x)@ZVI进行表征,结果表明,材料中生成了大量核壳结构的硫化零价铁,内核为Fe-Mo-C合金,外壳可能由硫化钼、FeS、C、钼氧化物和铁氧化物组成。降解实验结果表明,将较优条件制备的MoS_(x)@ZVI碎磨至粒径<0.1 mm,用0.6 g MoS_(x)@ZVI处理400 mL 200 mg/L OG模拟废水,在初始pH=3.0~10.0范围处理150 min,OG的去除率均在90%以上。展开更多
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 leach...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.展开更多
基金the National Key Research and Development Program of China(No.2018YFC1903400)the Key Program for International S&T Cooperation Projects of China(No.2021YFE0106800)+1 种基金the National Natural Science Foundation of China(Nos.52164020,52174248)the Science and Technology Research Project of Education Department of Jiangxi Province,China(No.GJJ190442).
文摘以辉钼矿(MoS_(2))、褐铁矿和无烟煤为原料,通过碳热还原法制备了MoS_(x)@ZVI复合材料。研究了MoS_(2)用量、焙烧温度、无烟煤用量和焙烧时间对MoS_(x)@ZVI去除酸性橙G(OG)的影响,并确定了制备MoS_(x)@ZVI的较优制备条件为焙烧温度1000℃、MoS_(2)用量6%、焙烧时间60 min和无烟煤用量25%。通过X射线衍射、扫描电子显微镜和能谱仪对较优条件制备的MoS_(x)@ZVI进行表征,结果表明,材料中生成了大量核壳结构的硫化零价铁,内核为Fe-Mo-C合金,外壳可能由硫化钼、FeS、C、钼氧化物和铁氧化物组成。降解实验结果表明,将较优条件制备的MoS_(x)@ZVI碎磨至粒径<0.1 mm,用0.6 g MoS_(x)@ZVI处理400 mL 200 mg/L OG模拟废水,在初始pH=3.0~10.0范围处理150 min,OG的去除率均在90%以上。
基金Project(51164010)supported by the National Natural Science Foundation of ChinaProject(2010GZC0048)supported by the Natural Science Foundation of Jiangxi Province,China
文摘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.
