A further study on the interaction between one of organic active fractions of the MHA binder and iron ore surface
A further study on the interaction between one of organic active fractions of the MHA binder and iron ore surface
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MHA粘结剂有机活性组分之一与铁矿石表面相互作用的进一步研究
DOI：
10.1016/j.minpro.2011.07.002
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发表时间：
2011-09-14
影响因子：
--
通讯作者：
Huang, Yanfang
中科院分区：
文献类型：
--
作者：
Jiang, Tao;Han, Guihong;Huang, Yanfang
粘结剂是铁矿石造块中必不可少的。黄腐酸 (FA) 是 MHA 粘合剂的有机活性部分之一。通过元素分析、化学基团分析、批量吸附实验进一步研究了FA与铁矿石表面的相互作用。 X 射线光电子能谱 (XPS) 研究、zeta 电位测量和扫描电子显微镜 (SEM) 成像。研究发现，随着溶液pH值的增加，FA在铁矿石表面的吸附量明显增加。 X射线光电子能谱（XPS）分析表明，配体交换（配位）作为一种特殊的化学吸附发生在铁矿石和FA的界面处。 Zeta 电位结果表明，FA 在铁矿石表面的吸附可以通过特定的配体交换和静电力来表征。扫描电子显微镜（SEM）成像显示吸附过程中观察到絮凝沉降。 FA包覆矿物颗粒的SEM显微照片中呈现出直径为20-100μm的球形FA-矿物胶体复合物。配体交换、疏水相互作用和静电力对吸附有贡献，其中配体交换和疏水相互作用占主导地位。 (C) 2011 Elsevier B.V. 保留所有权利。
Binder is essential in the iron ore agglomeration. Fulvic acid (FA) is one of organic active fractions of the MHA binder. A further study of the interaction between FA and iron ore surface was conducted via elemental analysis, chemical group analysis, batch adsorption experiments. X-ray photoelectron spectroscopy (XPS) investigation, zeta potential measurements and scanning electron microscope (SEM) imaging. It is found that the adsorption amount of FA onto iron ore surface obviously increases with increasing the solution pH. X-ray photoelectron spectroscopy (XPS) analysis indicates that ligand exchange (coordination) as a special chemical adsorption occurs at the interface of iron ore and FA. Zeta potential results display that the adsorption of FA onto iron ore surface can be characterized by specific ligand exchange and electrostatic forces. Scanning electron microscope (SEM) imaging shows that flocculation sedimentation is observed during the adsorption process. Ball-shaped FA-mineral colloidal complex with a diameter of 20-100 mu m is presented in the SEM micrograph of FA-coated mineral granules. Ligand exchange, hydrophobic interactions and electrostatic force are contributive to the adsorption, with ligand exchange and hydrophobic interactions predominant. (C) 2011 Elsevier B.V. All rights reserved.