摘要
以煤泥选择性絮凝浮选中的煤颗粒以及杂质矿物高岭石为研究对象,联合Washburn动态方程,van Oss-Chaudhury-Good理论研究了阴离子型低分子量聚丙烯酰胺PAM A401吸附前后煤及高岭石颗粒表面自由能的变化,并利用扩展的DLVO理论计算了PAM A401吸附前后颗粒间的相互作用势能,分析了絮凝剂吸附对不同颗粒分散状态的影响.研究表明,PAM A401的吸附改变了煤及高岭石的表面自由能及各成分的大小.煤吸附后疏水性略有降低,极性成分增加,非极性成分降低,表面自由能由39.92mJ/m2增大为40.43mJ/m2;高岭石吸附后疏水性略有增高,极性成分由58.27 mJ/m2降低为55.05 mJ/m2,表面自由能略有降低.PAM A401在颗粒表面的吸附改变了颗粒间相互作用势能的大小,尤其是界面极性作用势能的大小和作用范围,但仍未改变颗粒间总作用势能的吸引或排斥状态.本研究对微细粒煤泥选择性絮凝浮选中絮凝剂作用性能的判断和类型选择具有重要意义.
Coal particles and impurity mineral kaolinite in the selective flocculation flotation of fine coal were studied in this paper.Washburn equation and van Oss-Chaudhury-Good theory were used to estimate the surface free energy variation of coal and kaolinite particles before and after the adsorption of anionic polyacrylamide with low molecular weight（PAM A401）onto their surface.The interfacial interaction between particles of coal or kaolinite was calculated by the extended DLVO theory.The influence of PAM A401 adsorption on dispersion behavior of coal or kaolinite particles was analyzed.It was showed that adsorption of PAM A401 changed the surface free energy and its components of coal and kaolinite.The hydrophobicity of coal decreased,polar components increased,and non-polar components reduced after adsorption of PAM A401.The surface free energy of coal surface increased from 39.92mJ/m^2 to 40.43mJ/m^2.The hydrophobicity of kaolinite increased slightly,and the polar component reduced from58.27mJ/m^2 to 55.05mJ/m^2.After adsorption of PAM A401,the absolute value of total in-teraction potential energy between particles was changed,especially the value and action range of polar interaction.But the total potential energy state of attraction or repulsion of particles stayed unchanged.This research is of great significance to the performance judgment and selection of flocculant in selective flocculation flotation of fine coal.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2015年第6期1061-1067,共7页
Journal of China University of Mining & Technology
基金
国家重点基础研究发展计划项目(973计划)(2012CB214905)
中国博士后科学基金项目(2015M570937)
中央高校基本科研业务费专项资金项目(FRF-TP-15-049A1)
