Interfacial characterizations of iron ore concentrates affected by binders
Interfacial characterizations of iron ore concentrates affected by binders
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DOI：
10.1016/j.powtec.2003.10.001
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发表时间：
2004-01
影响因子：
5.2
通讯作者：
G. Qiu;T. Jiang;K. Fa;De‐qing Zhu;Dian-zuo Wang
中科院分区：
文献类型：
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作者：
G. Qiu;T. Jiang;K. Fa;De‐qing Zhu;Dian-zuo Wang
粘结剂被广泛用于改变铁矿颗粒的界面特性和提高其成球性。Funa是一种天然聚合物粘合剂。在国内开发并应用于生产铁矿石球团。本文通过表面张力、接触角、润湿热、zeta电位的测量和红外光谱（IRS）分析，研究了富纳与某磁铁矿精矿的界面相互作用，并与膨润土粘结剂进行了比较。结果表明，富那具有表面活性剂的性质，具有胶体颗粒的特性。使水的表面张力从73降到65 dyn cm−1。在掺量为0.6%的情况下，结合剂使精矿的接触角从46°急剧减小到0°，从而大大提高了精矿的亲水性。Zeta电位测量表明，磁铁矿精矿表面带负电荷，富纳的加入使磁铁矿精矿表面带更多的负电荷。IRS分析表明，粘结剂通过化学吸附作用粘附在精矿表面。膨润土对表面张力、接触角、润湿性和Zeta电位的影响不大。未观察到膨润土对精矿的化学吸附作用。
Binders are widely used to modify the interfacial characteristics and improve the ballability of iron ore particles. Funa is a natural polymer binder. It was developed and used in the production of iron ore pellets in China. In this paper, the interfacial interactions between Funa and a magnetite concentrate were investigated by measurements of surface tension, contact angle, wetting heat, zeta potential as well as by Infrared Spectroscopy (IRS) analysis as compared to bentonite binder. Results show that Funa behaves like surfactants and possesses the characteristics of colloid particles. It decreases the surface tension of water from 73 to 65 dyn cm−1. The binder reduces the contact angle of the concentrate sharply from 46° to 0° at a dosage of 0.6% and hence greatly improves the hydrophilic character of the concentrate. Zeta potential measurements show that the surface of the magnetite concentrate is negatively charged and the addition of Funa causes more negative surface charges. IRS analysis shows that the binder adheres to the concentrate surface by chemical adsorption. It was also shown that bentonite has little effects on the surface tension, contact angle, wettability and Zeta potential. No chemical adsorption of bentonite on the concentrate was observed.