Interfacial interactions between rough mineral particles have garnered considerable attention as they directly determine particle agglomeration and floatability.This study comprehensively investigates the agglomeratio...Interfacial interactions between rough mineral particles have garnered considerable attention as they directly determine particle agglomeration and floatability.This study comprehensively investigates the agglomeration characteristics of siderite particles after argon(Ar)plasma surface modification through settling tests,flocs size measurements,and fractal dimension calculations.Ar plasma surface modification promotes the agglomeration of siderite particles,as evidenced by increased floc size and density.The agglomeration mechanism induced by Ar plasma surface modification is evaluated using a theoretical model combining the surface element integration(SEI)approach,differential geometry,and the composite Simpson's rule.Changes in surface roughness,wettability,and charge are considered in this model.Compared to the unpretreated siderite particles,the energy barrier for interaction of the 30-min Ar plasma-pretreated siderite particles decreases from 2.3×10-^(17)J to 1.6×10^(-17)J.This reduction provides strong evidence for the agglomeration behavior of siderite particles.Furthermore,flotation experiments confirm that Ar plasma surface modification is conducive to the aggregation flotation of siderite.These findings offer crucial insights into particle aggregation and dispersion behaviors,with notable application in mineral flotation.展开更多
我国西北干旱缺水地区的某低品位磁铁矿石全铁品位为14.87%、磁性铁品位为9.27%,为了探究全干法分选工艺的可行性进行了选矿工艺研究。结果表明,矿石中主要铁矿物为磁铁矿,脉石矿物为石英;磁铁矿与脉石矿物间的嵌布关系紧密,但界限清晰...我国西北干旱缺水地区的某低品位磁铁矿石全铁品位为14.87%、磁性铁品位为9.27%,为了探究全干法分选工艺的可行性进行了选矿工艺研究。结果表明,矿石中主要铁矿物为磁铁矿,脉石矿物为石英;磁铁矿与脉石矿物间的嵌布关系紧密,但界限清晰,多以单晶或集合体的形式填充在脉石矿物粒间,单体解离总体较容易;矿石在碎至粒度为-10 mm情况下干式磁力预选(278.66 k A/m)、预选精矿在高压辊磨机闭路辊压至-3 mm情况下进行粗粉干式磁选(358.28 k A/m)、然后进行两阶段磨矿(-0.074 mm分别为55%和80%)各1粗1精干式弱磁选(分别为278.66、199.04 k A/m),获得了全铁品位65.64%、全铁回收率57.34%、磁性铁回收率88.06%的铁精矿,该指标较经典磁选流程对应指标分别低0.24、2.26、8.29个百分点。研究结果表明,该矿石采用全干法分选工艺是可行的,对缺水地区类似铁矿石资源的开发具有指导意义,但全干法分选设备的台时效率有较大提升空间。展开更多
基金financially supported by the National Natural Science Foundation of China(No.52204284)the China Postdoctoral Science Foundation(No.2025MD784125)+2 种基金the Natural Science Foundation of Shaanxi Province,China(No.2024JC-YBQN-0365)the Shaanxi Province Postdoctoral Science Foundation,China(No.2025BSHSDZZ363)Outstanding Youth Science Fund of Xi’an University of Science and Technology,China(No.202308)。
文摘Interfacial interactions between rough mineral particles have garnered considerable attention as they directly determine particle agglomeration and floatability.This study comprehensively investigates the agglomeration characteristics of siderite particles after argon(Ar)plasma surface modification through settling tests,flocs size measurements,and fractal dimension calculations.Ar plasma surface modification promotes the agglomeration of siderite particles,as evidenced by increased floc size and density.The agglomeration mechanism induced by Ar plasma surface modification is evaluated using a theoretical model combining the surface element integration(SEI)approach,differential geometry,and the composite Simpson's rule.Changes in surface roughness,wettability,and charge are considered in this model.Compared to the unpretreated siderite particles,the energy barrier for interaction of the 30-min Ar plasma-pretreated siderite particles decreases from 2.3×10-^(17)J to 1.6×10^(-17)J.This reduction provides strong evidence for the agglomeration behavior of siderite particles.Furthermore,flotation experiments confirm that Ar plasma surface modification is conducive to the aggregation flotation of siderite.These findings offer crucial insights into particle aggregation and dispersion behaviors,with notable application in mineral flotation.
文摘我国西北干旱缺水地区的某低品位磁铁矿石全铁品位为14.87%、磁性铁品位为9.27%,为了探究全干法分选工艺的可行性进行了选矿工艺研究。结果表明,矿石中主要铁矿物为磁铁矿,脉石矿物为石英;磁铁矿与脉石矿物间的嵌布关系紧密,但界限清晰,多以单晶或集合体的形式填充在脉石矿物粒间,单体解离总体较容易;矿石在碎至粒度为-10 mm情况下干式磁力预选(278.66 k A/m)、预选精矿在高压辊磨机闭路辊压至-3 mm情况下进行粗粉干式磁选(358.28 k A/m)、然后进行两阶段磨矿(-0.074 mm分别为55%和80%)各1粗1精干式弱磁选(分别为278.66、199.04 k A/m),获得了全铁品位65.64%、全铁回收率57.34%、磁性铁回收率88.06%的铁精矿,该指标较经典磁选流程对应指标分别低0.24、2.26、8.29个百分点。研究结果表明,该矿石采用全干法分选工艺是可行的,对缺水地区类似铁矿石资源的开发具有指导意义,但全干法分选设备的台时效率有较大提升空间。
