Adsorption mechanism of styryl phosphonate ester as collector in ilmenite flotation  

捕收剂苯乙烯膦酸酯在钛铁矿浮选中的吸附机理

作　　者：Yan-ling XU Kai-hua HUANG Hong-qiang LI Wei HUANG Cheng LIU Si-yuan YANG 徐艳玲;黄凯华;李洪强;黄伟;刘诚;杨思原(武汉理工大学资源与环境工程学院,武汉430070;中国生态环境部华南环境科学研究所,广州510530;武汉工程大学磷资源开发利用教育部工程研究中心,武汉430205;南方科技大学前沿与交叉科学研究院,深圳518055)

机构地区：[1]School of Resources and Environmental Engineering,Wuhan University of Technology,Wuhan 430070,China [2]South China Institute of Environmental Sciences,Ministry of Ecology and Environment,Guangzhou 510530,China [3]Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education,Wuhan Institute of Technology,Wuhan 430205,China [4]Academy for Advanced Interdisciplinary Studies,Southern University of Science and Technology,Shenzhen 518055,China

出　　处：《Transactions of Nonferrous Metals Society of China》2022年第12期4088-4098,共11页中国有色金属学报（英文版）

基　　金：the support from the National Natural Science Foundation of China(Nos.51904214 and 51804238);the Young Elite Scientists Sponsorship Program by CAST(No.YESS20200276);the Natural Science Foundation of Hubei Province,China(No.ZRMS2021000085);the Fundamental Research Funds for the Central Universities,China(No.2021IVA039);the Open Foundation of State Key Laboratory of Mineral Processing,BGRIMM Technology,China(Nos.BGRIMM-KJSKL-202122 and BGRIMM-KJSKL-2022-02);the Open Project of Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education,China(No.201904)。

摘　　要：A styryl phosphonate ester(SPE) collector was used to improve the flotation performance of ilmenite, and the adsorption mechanism and model were revealed and established, respectively. Microflotation tests showed that SPE exhibited a stronger collecting ability for ilmenite than the traditional collector styrene phosphonic acid(SPA). Zeta potential measurements revealed that both SPE and SPA could negatively shift the zeta potential of ilmenite, while SPE had more effects than SPA, suggesting the stronger adsorption of SPE. The analysis of X-ray photoelectron spectroscopy confirmed the chemisorption of SPA and SPE onto the Fe/Ti sites of ilmenite. According to frontier orbital theory, the chemical activities of SPE are greater than those of SPA. The partial densities of states analysis indicated that the PO—H groups of the collectors could interact with the Ti/Fe atoms of the ilmenite surface to generate a stable four-membered ring. The bonding model of the collector and(104) ilmenite surface showed that the adsorption energy of SPE was higher than that of SPA. Overall, SPE presented a better collecting ability and interaction effect for ilmenite flotation than SPA, and had the potential to replace SPA in the industry.采用捕收剂苯乙烯膦酸酯(SPE)提高钛铁矿浮选效率,揭示相关作用机理并建立吸附模型。单矿物浮选试验结果表明,SPE在钛铁矿浮选中表现出比传统苯乙烯膦酸(SPA)更强的捕收能力。Zeta电位测定结果显示,SPE和SPA都能使钛铁矿的Zeta电位负向移动,而SPE的作用效果比SPA更加明显,表明SPE在钛铁矿表面的吸附更强。X射线光电子能谱分析证实了SPA和SPE在钛铁矿的Fe/Ti位点上的化学吸附作用。前沿轨道理论分析结果表明,SPE的化学活性比SPA的高。局部态密度分析结果表明,两种捕收剂的PO—H基团可与钛铁矿的Ti/Fe原子相互作用,从而在钛铁矿表面生成一个稳定的四元环。捕收剂与(104)钛铁矿表面的结合模型显示,SPE的吸附能量高于SPA的。综上所述,SPE对钛铁矿浮选的捕收能力和作用效果均优于SPA的,具有在工业上替代SPA的潜力。

关 键 词：styryl phosphonate ester ILMENITE FLOTATION COLLECTOR X-ray photoelectron spectroscopy density functional theory adsorption mechanism 

分 类 号：TD951[矿业工程—选矿] TD923