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过程工程学报 ›› 2020, Vol. 20 ›› Issue (8): 959-969.DOI: 10.12034/j.issn.1009-606X.220024

• 过程与工艺 • 上一篇    下一篇

水中Ca2+和Mg2+对镜铁矿和绿泥石可浮性的影响机理

李明阳1,2， 廉 德1， 郝军杰1， 胡义明1*， 高翔鹏1   

  1. 1. 安徽工业大学冶金工程学院，安徽 马鞍山 243032 2. 昆明理工大学国土资源工程学院，云南 昆明 650093
  • 收稿日期:2020-01-15 修回日期:2020-03-11 出版日期:2020-08-24 发布日期:2020-08-24
  • 通讯作者: 胡义明 13855515822@126.com

Effect mechanism of Ca2+ and Mg2+ in water on the floatability of specularite and chlorite

Mingyang LI1,2, De LIAN1, Junjie HAO1, Yiming HU1*, Xiangpeng GAO1   

  1. 1. School of Metallurgy Engineering, Anhui University of Technology, Ma′anshan, Anhui 243032, China 2. Faculty of Land and Resources Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, China
  • Received:2020-01-15 Revised:2020-03-11 Online:2020-08-24 Published:2020-08-24

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摘要： 为研究水质对镜铁矿和绿泥石分离效果的影响，通过单矿物浮选实验、Zeta电位测量、玻尔兹曼理论分析、溶液化学计算和分子动力学模拟，分别在去离子水和自来水浮选环境中，研究了十二胺(DDA)体系中镜铁矿和绿泥石的浮选行为及Ca2+, Mg2+对镜铁矿和绿泥石浮选规律及作用机理。结果表明，自来水对镜铁矿和绿泥石有一定的抑制作用，与去离子水浮选环境相比，镜铁矿和绿泥石的回收率分别下降了8.01和8.99个百分点；模拟自来水环境中，Ca2+, Mg2+使镜铁矿回收率分别下降11.91和18.88个百分点，绿泥石回收率分别降低7.44和15.45个百分点。自来水浮选环境中镜铁矿和绿泥石可浮性降低主要由于自来水中Ca2+, Mg2+的抑制作用。Ca2+, Mg2+对镜铁矿的抑制作用比绿泥石强，且Mg2+的抑制效果比Ca2+明显。机理检测结果表明，Ca2+, Mg2+吸附使镜铁矿和绿泥石表面电位升高，减弱了DDA与矿物之间的静电吸附作用，促使镜铁矿和绿泥石接触角减小亲水性增大、界面层内RNH3+浓度降低，使DDA与镜铁矿和绿泥石的吸附间距增大，且DDA分子分布松散度增大，一定程度上抑制了镜铁矿和绿泥石的上浮。

关键词: 浮选, 水质, 镜铁矿, 绿泥石, 抑制

Abstract: In order to research the effect of water quality on the separation of specularite and chlorite, the effect and mechanism of Ca2+ and Mg2+ on the flotation behavior of specularite and chlorite using dodecylamine (DDA) as the collector were studied via micro-flotation tests, Zeta potential measurements, Boltzmann theoretical analyses, solution chemistry calculation and molecular dynamics simulation in deionized water and tap water flotation environment, respectively. The results of micro-flotation tests demonstrated that specularite and chlorite were depressed to some extent in tap water. Compared with the deionized water system, the recovery rates of specularite and chlorite decreased by 8.01 and 8.99 percent point, respectively. In simulated tap water environment, Ca2+and Mg2+ made the recovery rate of specularite decreased by 11.91 and 18.88 percent point, respectively, while decreased by 7.44 and 15.45 percent point, respectively, for chlorite. The inhibitory effect of tap water on specularite and chlorite flotation mainly caused by the existence of Ca2+ and Mg2+. The depression effect of Ca2+ and Mg2+ on specularite was stronger than that of chlorite, and the depression effect of Mg2+was more obvious than Ca2+. The results of mechanism detection indicated that the adsorption of Ca2+ and Mg2+ shifted the surface potential of the two minerals to higher values, wakened the electrostatic adsorption reaction between DDA and the two minerals, decreased the contact angle, hydrophobicity and the concentration of RNH3+ in interface layer, increased the adsorption distance between DDA and the two minerals, increased the loose degree of DDA, which in all depressed the flotation of specularite and chlorite. The research contents provide theoretical basis of disturbance law and elimination methods of water quality for iron ore flotation.

Key words: flotation, water quality, specularite, chlorite, depression