摘要
为深入分析粘土矿物伊利石与高分子絮凝剂聚丙烯酰胺(PAM)的作用机理,采用显色法测定了不同离子类型PAM在伊利石表面的吸附特性。结果表明:PAM对伊利石颗粒有较强的吸附作用,且不同类型PAM的吸附量大小顺序为:CPAM>NPAM>APAM,PAM在伊利石表面上的吸附更符合Langmiur吸附;由于颗粒表面电性改变及PAM的水解作用使得CPAM在碱性环境中的吸附量高于酸性环境,而APAM和NPAM的吸附规律则与此相反;通过调整溶液中Na、Ca离子含量可以明显促进NPAM和APAM的吸附,从而提高伊利石的絮凝效果,其主要原因在于伊利石的表面电性与水溶液的pH密切相关,由于CPAM的氢键作用、电性中和和架桥网捕作用可以快速提高伊利石的吸附与絮凝,同时溶液环境对于PAM分子链构型会产生一定影响,进而影响不同PAM的吸附量和絮团形貌。研究成果对提高煤泥浮选质量和固液分离效率具有重要理论与应用价值。
In order to deeply analyze the interaction mechanism between clay mineral illite and polyacrylamide(PAM),the adsorption characteristics of PAM with different ion types on illite surface were determined by chromogenic method.The results show that,PAM has a strong adsorption effect on illite particles,and the order of adsorption amount of different types of PAM is CPAM>NPAM>APAM.The adsorption of PAM on illite surface is more consistent with Langmuir adsorption.The adsorption capacity of CPAM in alkaline environment is higher than that in acid environment due to the change of particle surface electrical properties and hydrolysis of PAM,but the adsorption law of APAM and NPAM is opposite.By adjusting the content of Na and Ca ions in solution,the adsorption of NPAM and APAM can be significantly promoted,thus improving the flocculation effect of illite.The main reason is that the surface electrical property of illite is closely related to the pH of aqueous solution,so the adsorption and flocculation of illite can be improved rapidly due to hydrogen bonding,electrical neutralization and bridging net trapping of CPAM.At the same time,the solution environment has an effect on PAM molecular chain configuration,which in turn affects the adsorption capacity and floccules morphology of different PAM.The research results have an important theoretical and practical value for improving the flotation quality and solid-liquid separation efficiency of coal slime.
作者
王志清
樊玉萍
董宪姝
马晓敏
常明
WANG Zhiqing;FAN Yuping;DONG Xianshu;MA Xiaomin;CHANG Ming(Taiyuan University of Technology,Taiyuan,Shanxi 030024,China)
出处
《矿业研究与开发》
CAS
北大核心
2020年第11期136-141,共6页
Mining Research and Development
基金
国家自然科学基金重点国际(地区)合作研究项目(51820105006)
国家自然科学基金面上项目(51674174)
国家自然科学基金青年科学基金项目(51604189)。
关键词
伊利石
聚丙烯酰胺
吸附特性
絮凝效果
Illite
Polyacrylamide
Adsorption characteristics
Flocculation effect
