石英晶体微天平用于捕收剂在矿物表面动态吸附过程和机理的研究

项目名称： 石英晶体微天平用于捕收剂在矿物表面动态吸附过程和机理的研究

项目编号： No.51204012

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 冶金与矿业学科

项目作者： 寇珏

作者单位： 北京科技大学

项目金额： 25万元

中文摘要： 目前对浮选捕收剂在矿物表面作用机理的研究主要采用非实时和非原位的测定手段，这些方法只能在干燥或真空条件下得到吸附前后矿物表面的静态性状，而无法在液态环境下揭示捕收剂在矿物表面发生动态吸附的全过程。因此利用实时和原位的测定手段深入研究捕收剂动态吸附的过程和作用机理，对捕收剂的开发以及药剂制度的优化有着重要的理论和实际意义。本研究从捕收剂吸附层性质的角度出发，克服非实时测定手段的局限性，采用高精度石英晶体微天平QCM-D对典型的氧化矿和硫化矿捕收剂在矿物表面动态吸附和脱药的全过程进行原位测定和研究，在液态环境下实现对捕收剂吸附过程的实时动态量化，得到吸附层的质量、厚度、密度、三维形貌和粘弹性等性质的变化规律，并建立捕收剂的吸附动力学模型。通过QCM-D的测定和研究，揭示捕收剂与矿物作用过程中存在的不同反应阶段及其演化过程，并结合浮选试验结果，建立联系微观吸附过程与宏观浮选效果之间的理论模型。

中文关键词： 石英晶体微天平；捕收剂；吸附机理；氧化矿；硫化矿

英文摘要： Most of the concepts about the adsorption of collectors on minerals were based on ex-situ studies and indirect methods, which can only get the static property of adsorbed layer in vacuum or at dry condition but, unfortunately, cannot monitor the formation process of the dynamic adsorbed layer in liquid. To better understand the mechanism that governs the selectivity and flotation performance of collectors, it is crucial, both practically and theoretically, to characterize the amount and property of collector layer which dynamically adsorbed on mineral surface by real-time and in-situ measurements. The objective of this study is to investigate in-situ the dynamic adsorption and desorption behavior of flotation collectors (collectors for oxidized minerals and sulfide minerals) by use of a high sensitivity surface characterization technique referred to as quartz crystal microbalance with dissipation technique (QCM-D), which is capable of providing real-time information on the adsorption layer mass, density, thickness, viscosity, morphology and structural change under various process conditions. QCM-D can derive valuable in-situ information as well as the mechanical structural properties of the adsorbed layer, which enables the quantification of entire dynamic adsorption process and solves the key problems that were

英文关键词： QCM-D；collector；adsorption mechanism；oxidized mineral；sulfide mineral