Gouvêa Junior José Tadeu, Chipakwe Vitalis, de Salles Leal Filho Laurindo, Chehreh Chelgani Saeed
Department of Mining and Petroleum Engineering, Polytechnic School, University of São Paulo, Avenida Professor Melo Moraes, 2373, Cidade Universitária, São Paulo, SP, 05508-900, Brazil.
Minerals and Metallurgical Engineering, Swedish School of Mines, Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, 971 87, Luleå, Sweden.
Sci Rep. 2023 Nov 23;13(1):20550. doi: 10.1038/s41598-023-47807-0.
A considerable amount of ultrafine magnetite as the iron source will end up in the tailing dams since the magnetic separation process markedly drops as the particle size. Cationic reverse flotation could be one of the main alternatives for recovering ultrafine magnetite. As a systematic approach, this study explored the flotation efficiency and interaction mechanisms of two biodegradable ether amines (diamine and monoamine) to separate ultrafine quartz from magnetite (- 20 µm). Several assessments (single and mixed mineral flotation, zeta potential, contact angle, surface tension measurement, turbidity, and Fourier transform infrared) were conducted to explore the efficiency of the process and the interaction mechanisms. Results indicated that ether diamine and monoamine could highly float ultrafine quartz particles (95.9 and 97.7%, respectively) and efficiently separate them from ultrafine magnetite particles. Turbidity assessments highlighted that these cationic collectors could aggregate magnetite particles (potentially hydrophobic coagulation) and enhance their depression. Surface analyses revealed that the collector mainly adsorbed on the quartz particles, while it was essentially a weak interaction on magnetite.
由于随着粒度减小磁选过程显著下降，大量作为铁源的超细磁铁矿最终会进入尾矿坝。阳离子反浮选可能是回收超细磁铁矿的主要替代方法之一。作为一种系统方法，本研究探讨了两种可生物降解醚胺（二胺和单胺）从磁铁矿（-20μm）中分离超细石英的浮选效率和相互作用机制。进行了多项评估（单矿物和混合矿物浮选、ζ电位、接触角、表面张力测量、浊度和傅里叶变换红外光谱）以探究该过程的效率和相互作用机制。结果表明，醚二胺和单胺能够高效浮选超细石英颗粒（分别为95.9%和97.7%），并有效地将它们与超细磁铁矿颗粒分离。浊度评估突出显示，这些阳离子捕收剂能够聚集磁铁矿颗粒（可能是疏水凝聚）并增强其抑制作用。表面分析表明，捕收剂主要吸附在石英颗粒上，而在磁铁矿上基本上是弱相互作用。
