Selective flotation separation of ilmenite from titanaugite using n-octylphosphonic acid as collector in acidic pulp  

酸性矿浆中以辛基膦酸作捕收剂选择性浮选分离钛铁矿和钛辉石

作　　者：Pan CHEN Jia-yan LIU Ji-hua ZHAI Yao-hui YANG Wei SUN 陈攀;刘佳燕;翟计划;杨耀辉;孙伟(四川大学材料科学与工程学院,成都610000;中南大学资源加工与生物工程学院,长沙410083;成都理工大学材料与化学化工学院,成都610059;中国地质调查局成都矿产综合利用研究所,成都610041)

机构地区：[1]College of Materials Science and Engineering,Sichuan University,Chengdu 610000,China [2]School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China [3]College of Materials and Chemistry&Chemical Engineering,Chengdu University of Technology,Chengdu 610059,China [4]Institute of Multipurpose Utilization of Mineral Resource,CAGS,Chengdu 610041,China

出　　处：《Transactions of Nonferrous Metals Society of China》2025年第3期954-964,共11页中国有色金属学报(英文版)

基　　金：supported by the National Natural Science Foundation of China(No.52074357);the Vanadium Titanium Union Foundation,China;China Postdoctoral Science Foundation(No.2019M650188)。

摘　　要：n-octylphosphonic acid(OPA)was introduced as a novel collector for ilmenite flotation and its effectiveness was compared with the conventional chelating collector,benzohydroxamic acid(BHA).Micro-flotation tests demonstrated that OPA was a highly effective and selective collector for separating ilmenite from titanaugite over acidic conditions(optimal pH around 3),which was also supported by adsorption amount measurements.X-ray photoelectron spectroscopy(XPS)tests indicated that the chemisorption of OPA onto ilmenite surface was much stronger than that of BHA.Solution chemistry diagram analyses indicated that OPA could dissociate well at pH 3.0 and mostly exist in anion form.DFT calculations further confirmed that OPA was much easier to adsorb onto ilmenite surface with shorter bond length and lower adsorption energy in comparison with BHA.Therefore,OPA maintained good collecting ability and selectivity for ilmenite flotation in the strongly acidic pulp,providing valuable insights into new collector design and development.引入辛基膦酸(OPA)作为钛铁矿浮选的新型捕收剂,并与传统螯合捕收剂苯甲基羟肟酸(BHA)进行比较。单矿物浮选实验表明,OPA是一种在酸性条件下(最佳pH值约为3)从钛辉石中分离钛铁矿的高效选择性捕收剂,吸附量测试也证实如此。X射线光电子能谱(XPS)测试结果表明,OPA在钛铁矿表面的化学吸附作用比BHA更强。溶液化学组分图分析表明,OPA在pH为3.0时可以很好地解离,并且主要以阴离子形式存在。DFT计算进一步证实,与BHA相比,OPA更容易吸附在钛铁矿表面,键长更短,吸附能更低。因此,在强酸性矿浆溶液中,OPA对钛铁矿保持了良好的捕收能力和选择性,这对新型捕收剂的设计和开发有一定的借鉴作用。

关 键 词：ILMENITE titanaugite flotation separation n-octylphosphonic acid 

分 类 号：O64[理学—物理化学]