The influence of surface dissolution on flotation separation of fine ilmenite from titanaugite was investigated through infrared spectroscopic （FT-IR） analysis and X-ray photoelectron spectroscopy （XPS） test. The ...The influence of surface dissolution on flotation separation of fine ilmenite from titanaugite was investigated through infrared spectroscopic （FT-IR） analysis and X-ray photoelectron spectroscopy （XPS） test. The results show that surface dissolution in weak acid solution is helpful to enlarge the floatability difference between ilmenite and titanaugite. In weak acidic solution, as sodium oleate mainly interacts with Fe which results in ilmenite flotation, and surface dissolution is beneficial to its oxidation, the floatability of ilmenite after surface dissolution is increased; meanwhile, sodium oleate interacts with Ca and Mg which results in titanangite flotation, and the quantities of Ca and Mg on the surface of titanautite are decreased due to the surface dissolution, so the floatability of titanaugite after surface dissolution is depressed. For an ilmenite ore obtained from Panzhihua with TiO2 grade of 8.41%, flotation after surface dissolution treatment could increase TiO2 grade of rough concentrate from 26.7% to 31.73 %.展开更多
This paper researched the enhanced flotation separation performance of ilmenite and titanaugite using the mixed collector benzhydroxamic acid/dodecylamine(BHA/DDA).The interface assembly mechanism was mainly investiga...This paper researched the enhanced flotation separation performance of ilmenite and titanaugite using the mixed collector benzhydroxamic acid/dodecylamine(BHA/DDA).The interface assembly mechanism was mainly investigated through in situ attenuated total reflectance Fourier transform infrared(ATRFTIR)spectroscopy combined with the two-dimensional correlation spectroscopy(2D-COS)and X-ray photoelectron spectroscopy(XPS).It has been found that BHA/DDA mixed collectors successfully separate ilmenite from titanaugite at a molar ratio of 8:1.Zeta potential experiments suggested that,in the presence of mixed collector system,the BHA-DDA complex adsorbed on the ilmenite surface via the chemically adsorbed BHA and the electrostatically adsorbed DDA,however,the complex adsorbed on the surface of titanaugite unstably.According to in situ ATR-FTIR combined with 2D-COS and XPS results,the interface assembly mechanism of BHA/DDA is summarized as:the function group of BHA molecules first binds to the metal sites on minerals to form bidentate ligand,then DDA co-adsorbed with BHA on the surface of minerals through hydrogen bonding.DDA may change the adsorption modes of some BHA on the ilmenite surface from four-membered ring to five-membered ring,while the modes on the titanaugite surface is true opposite.Finally,recommended adsorption configurations of the BHA/DDA complex on the two mineral surfaces are proposed.展开更多
微细粒钛铁矿与钛辉石的有效分离是钛铁矿浮选中的难题,为探索2种样品的表面性质差异,以去离子水、正己烷、1-溴萘和甲酰胺为检测液体,采用Washburn动态毛细管法和环境扫描电子显微镜分别研究了2种样品的表面润湿性和表面结构.结果表明,...微细粒钛铁矿与钛辉石的有效分离是钛铁矿浮选中的难题,为探索2种样品的表面性质差异,以去离子水、正己烷、1-溴萘和甲酰胺为检测液体,采用Washburn动态毛细管法和环境扫描电子显微镜分别研究了2种样品的表面润湿性和表面结构.结果表明,4种检测液体对2种样品的润湿速率均为:去离子水>正己烷>1-溴萘>甲酰胺;钛铁矿和钛辉石的非极性Lifshitzvan der Waals作用能分别为42.51mJ/m2和43.97mJ/m2,极性Lewis酸碱作用能分别为0.58mJ/m2和5.64mJ/m2,Lewis碱明显大于Lewis酸,样品表面接近于非极性,并表现出更强的Lewis碱特征;2种矿物的表面元素含量存在明显差异,钛辉石的亲水性比钛铁矿更强.展开更多
基金Project (2007CB613602) supported by the National Basic Research Program of China Project (20090162110053) supported by Doctoral Fund of Ministry of Education of China Project (CX2009B049) supported by Hunan Provincial Innovation Foundation For Postgraduate, China
文摘The influence of surface dissolution on flotation separation of fine ilmenite from titanaugite was investigated through infrared spectroscopic （FT-IR） analysis and X-ray photoelectron spectroscopy （XPS） test. The results show that surface dissolution in weak acid solution is helpful to enlarge the floatability difference between ilmenite and titanaugite. In weak acidic solution, as sodium oleate mainly interacts with Fe which results in ilmenite flotation, and surface dissolution is beneficial to its oxidation, the floatability of ilmenite after surface dissolution is increased; meanwhile, sodium oleate interacts with Ca and Mg which results in titanangite flotation, and the quantities of Ca and Mg on the surface of titanautite are decreased due to the surface dissolution, so the floatability of titanaugite after surface dissolution is depressed. For an ilmenite ore obtained from Panzhihua with TiO2 grade of 8.41%, flotation after surface dissolution treatment could increase TiO2 grade of rough concentrate from 26.7% to 31.73 %.
基金This work was supported by the National Natural Science Foundation of China(Nos.51904249 and 51922091)the Sichuan Science and Technology Program(No.SYZ202074)the Open Research Fund of State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization(No.CNMRCUKF2001).
文摘This paper researched the enhanced flotation separation performance of ilmenite and titanaugite using the mixed collector benzhydroxamic acid/dodecylamine(BHA/DDA).The interface assembly mechanism was mainly investigated through in situ attenuated total reflectance Fourier transform infrared(ATRFTIR)spectroscopy combined with the two-dimensional correlation spectroscopy(2D-COS)and X-ray photoelectron spectroscopy(XPS).It has been found that BHA/DDA mixed collectors successfully separate ilmenite from titanaugite at a molar ratio of 8:1.Zeta potential experiments suggested that,in the presence of mixed collector system,the BHA-DDA complex adsorbed on the ilmenite surface via the chemically adsorbed BHA and the electrostatically adsorbed DDA,however,the complex adsorbed on the surface of titanaugite unstably.According to in situ ATR-FTIR combined with 2D-COS and XPS results,the interface assembly mechanism of BHA/DDA is summarized as:the function group of BHA molecules first binds to the metal sites on minerals to form bidentate ligand,then DDA co-adsorbed with BHA on the surface of minerals through hydrogen bonding.DDA may change the adsorption modes of some BHA on the ilmenite surface from four-membered ring to five-membered ring,while the modes on the titanaugite surface is true opposite.Finally,recommended adsorption configurations of the BHA/DDA complex on the two mineral surfaces are proposed.
文摘微细粒钛铁矿与钛辉石的有效分离是钛铁矿浮选中的难题,为探索2种样品的表面性质差异,以去离子水、正己烷、1-溴萘和甲酰胺为检测液体,采用Washburn动态毛细管法和环境扫描电子显微镜分别研究了2种样品的表面润湿性和表面结构.结果表明,4种检测液体对2种样品的润湿速率均为:去离子水>正己烷>1-溴萘>甲酰胺;钛铁矿和钛辉石的非极性Lifshitzvan der Waals作用能分别为42.51mJ/m2和43.97mJ/m2,极性Lewis酸碱作用能分别为0.58mJ/m2和5.64mJ/m2,Lewis碱明显大于Lewis酸,样品表面接近于非极性,并表现出更强的Lewis碱特征;2种矿物的表面元素含量存在明显差异,钛辉石的亲水性比钛铁矿更强.
