酸蚀对白云石可浮性的影响及其作用机理  

Effect of Acid Etching on the Floatability of Dolomite and Its Mechanism of Action

作　　者：郭俊 印万忠[1] 杨斌 朱张磊 GUO Jun;YIN Wan-zhong;YANG Bin;ZHU Zhang-ei(School of Resources&Civil Engineering,Northeastern University,Shenyang 110819,China;School of Chemical Engineering,China University of Mining and Technology,Xuzhou 221116,China;School of Chemistry and Chemical Engineering,Xi’an University of Science and Technology,Xi’an 710054,China)

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819 [2]中国矿业大学化工学院,江苏徐州221116 [3]西安科技大学化学与化工学院,陕西西安710054

出　　处：《东北大学学报（自然科学版）》2024年第1期93-100,共8页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(52174239,51874072,52204284);中央高校基本科研业务费专项资金资助项目(N2101025).

摘　　要：在油酸钠体系下,通过浮选试验、浮选动力学拟合、表面粗糙度表征、比表面积分析、XPS分析、吸附性能分析和润湿性分析,研究了酸蚀对白云石可浮性的影响及其作用机理.研究结果表明:酸蚀后,白云石表面粗糙度和比表面积增大,这暴露出更多的活性位点,强化了与油酸钠的吸附,增强了白云石的疏水性,进而改善了白云石的浮选性能.此外,在浮选动力学拟合中,经典一级动力学模型、一级矩阵分布模型、二级动力学模型的R2均高于95%.相比于其他模型,经典一级动力学拟合效果较好.其中在油酸钠质量浓度为60 mg/L时,酸蚀后白云石经典一级动力学k最大值为1.88 min^(-1),与此同时,酸蚀前白云石经典一级动力学k=1.15 min^(-1),表明酸蚀可以提高白云石浮选速率.本研究为白云石浮选提供了新的研究方向,具有一定的理论和现实意义.The effect of acid etching on the floatability of dolomite and its mechanism of action were investigated by flotation tests,flotation kinetic fitting,surface roughness characterization,specific surface area analysis,XPS analysis,adsorption performance analysis and wettability analysis under sodium oleate system.The research results showed that acid etching increased the surface roughness and specific surface area of dolomite,exposing more active sites,strengthened the adsorption sodium oleate,enhanced the hydrophobic of dolomite,and thus improved the performance of dolomite.Moreover,regarding flotation kinetic fitting,the classical first-order model,first-order model with rectangular distribution of floatability,and the second-order kinetic model all displayed the R2 values higher than 95%.Compare with other models,the classical first-order model exhibited the best fit.At a sodium oleate mass concentration of 60 mg/L,the k value of classical first-order for dolomite reached a maximum value of 1.88 min^(-1).However,in this case,before acid etching,the k value of classical first-order model for dolomite was only 1.15 min^(-1).These results further confirmed that acid etching could improve the flotation rate of dolomite.In summary,this study can provide a new research perspective for dolomite flotation,with a certain theoretical and practical significance.

关 键 词：白云石 粗糙度 酸蚀 可浮性 浮选动力学 

分 类 号：TU45[建筑科学—岩土工程]