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金属矿山 ›› 2020, Vol. 49 ›› Issue (06): 56-61.

• 基因矿物加工专题 • 上一篇    下一篇

绿泥石晶体各向异性及与其可浮性关系研究

李明阳 1,2,3 廉 德 1 李 昊 1 陈汪兴 4 胡义明 1 高翔鹏 1 童 雄 3   

  1. . 安徽工业大学冶金工程学院,安徽 马鞍山243032;2. 冶金减排与资源综合利用教育部重点实验室,安徽 马鞍山 243002;3. 昆明理工大学国土资源工程学院,云南 昆明 650093;4. 东北大学冶金学院,辽宁 沈阳 110189
  • 出版日期:2020-06-15 发布日期:2020-06-23
  • 基金资助:

    国家自然科学基金项目(编号:51904001,51674001),安徽省重点研究和开发计划项目(编号:201904a07020044, 201904a07020054)

Research on Anisotropy of Chlorite and Its Relationship with Floatability

Li Mingyang1,2,3 Lian De1 Li Hao1 Chen Wangxing4 Hu Yiming1 Gao Xiangpeng1 Tong Xiong3   

  1. 1. School of Metallurgy and Resource,Anhui University of Technology,Maanshan 243032,China;2. Key Laboratory of Metallurgical Emission Reduction & Resources Recycling,Ministry of Education,243002 Maanshan,China;3. Faculty of Land Resource Engineering,Kunming University of Science and Technology,Kunming 650093,China;4. School of Metallurgy,Northeastern University,Shenyang 110819,China
  • Online:2020-06-15 Published:2020-06-23

摘要: 通过对-37 μm、37~44 μm、44~74 μm 3 个粒级绿泥石进行 X 射线衍射(XRD)分析、单矿物浮选试验、捕收剂吸附规律研究和分子动力学模拟,研究了绿泥石晶体的各向异性及与可浮性的关系。XRD 分析结果显示,随着绿泥石粒度降低,平行解理面的含量持续升高,层间解理面优先解离。浮选试验结果表明,3 个粒级绿泥石可浮性顺序为中间粒级(37~44 μm)>细粒级(-37 μm)>粗粒级(44~74 μm)。捕收剂吸附规律检测和分子动力学模拟结果显示:十二胺在绿泥石表面的吸附密度随绿泥石粒级减小而降低,而吸附量随绿泥石粒度减小而升高;十二胺主要通过亲固基氨基吸附在绿泥石(001)面,十二胺分子碳链主要沿绿泥石(001)面法线方向分布;与绿泥石(001)面相比,(100)面含有大量正电性金属离子,减弱了十二胺与绿泥石(100)的静电吸附作用,十二胺在绿泥石(100)面的吸附靶向度不高,为非有效吸附;绿泥石(001)面对十二胺的吸附强度大于(100)面。绿泥石晶体的各向异性表现明显,(001)面含量升高对绿泥石浮选有利,在阳离子捕收剂体系中,通过选择性磨矿,提高绿泥石层间解离效率是改善绿泥石选矿效果的关键。

关键词: 绿泥石, 各向异性 , 粒级 , 十二胺 , 吸附 , 法线方向, 靶向度

Abstract: The relationship between the anisotropy of chlorite and its floatability was studied via X-ray diffraction (XRD)analysis,single mineral flotation,adsorption law of collector,and molecular dynamics simulation for three size fraction of chlorite(-37 μm,37~44 μm,44~74 μm). The XRD analysis results indicated that the content of parallel cleavage plane increased continuously with the size fraction decrease,and interlamellar cleavage plane liberated preferentially. The flotation results demonstrated that the floatability order was medium size fraction(37-44 μm)>fine size fraction(-37 μm)> coarse size fraction(44-74 μm). The adsorption law of dodecylamine and molecular dynamics simulation results confirmed that the adsorption density of dodecylamine on chlorite surface decreased with the decrease of size fraction,while the adsorption amount increased with the decrease of size fraction,and dodecylamine mostly adsorbed on chlorite(001)surface along the normal direction. Compared with(001)surface of chlorite,there are massive positive metal ions on(100)surface, which weaken the electrostatic adsorption effect of dodecylamine on(100)surface,resulting in the lower adsorption target degree of dodecylamine on chlorite(100)surface(ineffective adsorption)and the higher adsorption strength of dodecylamine on(001)surface than that of(100)surface. Chlorite shows anisotropy obviously and the increase of(001)surface content is favorable for chlorite flotation. Increasing the dissociation of interlayer efficiency via selective grinding is the key point of improving the effect of chlorite flotation. 

Key words: Chlorite, Anisotropy, Size fraction, Dodecylamine, Adsorption, Normal direction, Target degree