磨矿介质对氟磷灰石表面性质及可浮性的影响  

Effect of grinding media on the surface properties and floatability of fluorapatite

作　　者：黄小芬 张覃 HUANG Xiao-fen;ZHANG Qin(College of Resources and Environmental Engineering,Guizhou University,Guiyang 550025,China;Guizhou Academy of Science,Guiyang 550001,China;National&Local Joint Laboratory of Engineering for Effective Utilization of Regional Mineral Resources from Karst Areas,Guiyang 550025,China;Guizhou Engineering Laboratory of Efficient Utilization of Superior Mineral Resources,Guiyang 550025,China;Guizhou Key Laboratory of Comprehensive Utilization of Non-metallic Mineral Resources,Guiyang 550025,China)

机构地区：[1]贵州大学资源与环境工程学院,贵州贵阳550025 [2]贵州科学院,贵州贵阳550001 [3]喀斯特地区优势矿产资源高效利用国家地方联合工程实验室,贵州贵阳550025 [4]贵州省优势矿产资源高效利用工程实验室,贵州贵阳550025 [5]贵州省非金属矿产资源综合利用重点实验室,贵州贵阳550025

出　　处：《矿物学报》2023年第5期708-718,共11页Acta Mineralogica Sinica

基　　金：贵州省科技计划项目(编号:黔科合平台人才[2020]4105)。

摘　　要：磨矿是浮选前的准备作业,不仅为浮选提供粒度合适、解离充分的入选物料,还会对矿物表面性质产生影响,从而影响矿物的可浮性。本文通过单矿物浮选试验、扫描电镜(SEM)、原子力显微镜(AFM)和比表面积测定(BET)等方法,对陶瓷球磨和陶瓷棒磨两种形状磨矿介质的氟磷灰石颗粒形貌和可浮性进行了研究。结果表明,当使用NaOL捕收剂时,棒磨氟磷灰石的可浮性优于球磨,棒磨比球磨更有利于氟磷灰石的浮选。棒磨氟磷灰石和球磨氟磷灰石颗粒均为不规则的砾石状,颗粒棱角分明,且断口面参差不平,两种磨矿方式所得到的氟磷灰石颗粒形状系数差异不大,两者颗粒球形度(R_(o))和伸长率(EW)的分布区间差异也很微小,但棒磨氟磷灰石颗粒比球磨氟磷灰石颗粒粗糙度更大。棒磨氟磷灰石颗粒的临界表面张力小于球磨氟磷灰石,棒磨氟磷灰石颗粒疏水性更好,这一结果符合Wenzel和Cassie的表面润湿性理论,即疏水表面的润湿性随粗糙度的增大而降低。Grinding is an important pre-treatment process in mineral processing for achieving sufficient mineral liberation and particle size reduction.Mineral particles produced by different grinding media have different surface properties and floatability.This study investigated the flotation performance and surface properties of fluorapatite particles produced by ceramic rod and ball media grinding through single mineral flotation,scanning electron microscopy(SEM),Atomic Force Microscope(AFM)and BET surface area measurement.The results revealed that the rod mill fluorapatite particles had a greater hydrophobicity when treated with NaOL solution,and accordingly perform a better flotation recovery compared to the ball mill ones.The SEM analysis confirmed that both rod and ball mill fluorapatite particles are irregular gravelly shape,with clear edges and uneven fracture surfaces.There is little difference in the shape coefficient of fluorapatite particles obtained by the two grinding methods,and the difference in the distribution interval of R_(o) and EW values between them is also very small.However,the roughness of rod mill fluorapatite particles is larger than that of ball mill ones.The wettability tests showed that rod mill fluorapatite particles have better hydrophobicity,because the critical surface tension of rod mill fluorapatite particles is smaller than that of ball mill fluorapatite particles.This result accords with Wenzel and Cassie's surface wettability theory.That is,the wettability of hydrophobic surface decreases with the increase of roughness.

关 键 词：磨矿介质 氟磷灰石 表面性质 可浮性 

分 类 号：P579[天文地球—矿物学] TD923[天文地球—地质学] TD97[矿业工程—选矿]