Gao Xiangpeng, Zhao Fugang, Li Mingyang, Hu Yiming
Key Laboratory of Metallurgical Emission Reduction & Resources Recycling, Anhui University of Technology, Ministry of Education Ma'anshan 243002 China
Sinosteel Maanshan Institute of Mining Research Co., Ltd. Ma'anshan 243071 China.
RSC Adv. 2020 May 13;10(31):18360-18367. doi: 10.1039/d0ra03060k. eCollection 2020 May 10.
Separation of specularite from iron-containing silicate iron ore is challenging due to the similar surface properties of minerals and gangues. In this work, propyl gallate (PG) was applied as a chelating collector to separate specularite from chlorite. The flotation results indicated that collector sodium oleate (NaOL) shows little selectivity for the separation of specularite and chlorite. In contrast, the separation of specularite can be achieved with no depressant required when PG was used as the collector. The optimal separation results were obtained for single mineral flotation with recoveries of 87.11% and 6.98% for specularite and chlorite, respectively, and for mixed mineral flotation with 65.13% TFe grade and 76.28% TFe recovery, when the slurry pH was 8 and PG concentration was 40 mg L. FT-IR and XPS analyses indicated that PG could be favorably adsorbed on specularite phenolic hydroxyl groups, and molecular dynamic simulation results further elucidated the adsorption mechanism. This research suggested that the chelating flotation collector could be effective in the separation of minerals from iron-containing silicate iron ores.
由于矿物和脉石的表面性质相似，从含铁硅酸盐铁矿石中分离镜铁矿具有挑战性。在这项工作中，没食子酸丙酯（PG）被用作螯合捕收剂来从绿泥石中分离镜铁矿。浮选结果表明，捕收剂油酸钠（NaOL）对镜铁矿和绿泥石的分离几乎没有选择性。相比之下，当使用PG作为捕收剂时，无需抑制剂即可实现镜铁矿的分离。在矿浆pH值为8且PG浓度为40 mg/L时，单矿物浮选获得了最佳分离结果，镜铁矿和绿泥石的回收率分别为87.11%和6.98%，混合矿物浮选的TFe品位为65.13%，TFe回收率为76.28%。傅里叶变换红外光谱（FT-IR）和X射线光电子能谱（XPS）分析表明，PG可以通过酚羟基有利地吸附在镜铁矿上，分子动力学模拟结果进一步阐明了吸附机理。该研究表明，螯合浮选捕收剂可有效用于从含铁硅酸盐铁矿石中分离矿物。
