Ca2+在粗细粒辉钼矿表面吸附和对可浮性影响

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1、2+Ca在粗细粒辉钼矿表面吸附及对可浮性影响袁航，何廷树，李慧，王宇斌（西安建筑科技大学材料与矿资学院,陕西西安710055）摘要：为了探明Ca2+对粗细粒辉钼矿浮选行为和吸附特性的影响进行了研究。通过纯矿物浮选试验，结合Zeta电位测试、Ca2+溶液化学分析、XPS等手段探讨了Ca2+在粗细粒辉钼矿表面吸附对可浮性的影响。矿浆中Ca2+会明显恶化辉钼矿的浮选效果，且对细粒级影响更加明显；在浓度为1.0×10-2mol/LCa2+溶液体系中，pH<12.39时，主要以钙离子和羟基钙离子形式存在，排除了由于Ca(OH)2沉淀罩盖纯矿物表面造成辉钼矿回收率下降的影响因素；经Ca2+作用过的辉钼矿

2、表面电位绝对值显著变小，证明Ca2+在辉钼矿表面发生了较强的吸附。此外，由XPS谱图分峰处理结果得到细粒级辉钼矿表面Ca-MoO4相对含量较粗粒高出1.15倍。钙离子对细粒辉钼可浮性矿恶化更加明显，是由于Ca2+在辉钼矿“棱”面发生了化学吸附反应，在其表面形成CaMoO4亲水薄膜，降低了矿物可浮性。关键词：辉钼矿；表面吸附；可浮性；XPS分析中图分类号：TD952文献标识码：AAdsorptionofCa2+onthesurfaceofcoarse-finemolybdenumoreanditseffectonfloatabilityYUANHang,HETingshu,LIHui,WANG

3、Yubing(CollegeofMaterialandResource,Xi'anUniversityofArchitectureandTechnology,Xi'an710055，Shaanxi,China)ABSTRACT:InordertofindouttheeffectofCa2+ontheflotationbehaviorandadsorptioncharacteristicsofcoarse-finemolybdenite.ThemechanismofCa2+andcoarse-finemolybdenitewasexploredbymeansofpuremineralflota

4、tiontestscombinedwithZetapointtest,Ca2+solutionchemicalandXPSanalysis.TheresultsshowthattheCa2+inoreslurrywillsignificantlyweakenthemolybdeniteflotationeffect,andtheinfluenceoffinegrainismoreobvious；Intheconcentrationof1.0x10-2mol/LCa2+solution,whenpH<12.39,itexistsmainlyintheformofcalciumionandcal

5、ciumhydroxideion，FurtherexclusionofthefactorsaffectingthedecreaseofmolybdenumrecoveryduetoCa(OH)2sedimentationonthesurfaceofpureminerals；TheabsolutevalueofthesurfacepotentialofmolybdenitethathasbeentreatedwithCa2+hasbecomesignificantlysmaller,demonstratingthatCa2+hasastrongadsorptiononthemolybdenit

6、esurface.Inaddition,thepeakcontentofCa-MoO4onthesurfaceoffine-grainedmolybdenitewas1.15timeshigherthanthatofcoarseparticlesbythepeakseparationtreatmentofXPSspectrum.Comparedwiththecoarseparticles,thecalciumionsaremoreobviousforthereductionofthefloatableoreofthefineparticlesofmolybdenite.Itisduetoth

7、echemicaladsorptionofCa2+onthe“edge”surfaceofmolybdenite，formingahydrophilicfilmofCaMoO4onthesurface,whichreducesthefloatabilityoftheminerals.Keywords:molybdeniteore;surfaceadsorption;floatability;XPSanalys