(1. 江西理工大学 资源与环境工程学院，赣州 341000；
2. 西部矿业股份有限公司 博士后科研工作站，西宁 810000)
摘 要: 通过浮选试验、吸附试验及动电位测试，研究不同温度下甲基纤维素在滑石表面的吸附行为，考察温度对滑石表面已吸附的甲基纤维素抑制效果的影响。结果表明：当温度较低时，甲基纤维素溶解在水中，通过疏水作用吸附在滑石表面，吸附量较低，对滑石的抑制效果较弱；随着温度升高，甲基纤维素从溶液中析出，沉积在滑石表面，吸附量较大，抑制效果较强。已经吸附在滑石表面的甲基纤维素的抑制效果也受温度影响，温度升高会导致吸附的甲基纤维素层的抑制效果减弱，且这种变化是可逆的，温度再降低会使甲基纤维素吸附层的抑制效果再次增强，这是由于温度较低时滑石表面吸附的甲基纤维素通过羟基与水分子形成氢键而结合，导致矿物表面亲水性较强，从而对滑石产生较强的抑制作用；当温度升高时，甲基纤维素分子失去结合水，含水量降低，对滑石抑制效果减弱。
关键字: 滑石；浮选；温度；甲基纤维素；应激反应
（1. School of Resource and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China;
2. Post-doctoral Scientific Research Workstation, Western Mining Co., Ltd., Xining 810000, China）
Abstract:The adsorption behaviour of methylcellulose on talc surface and the stimulus response of methylcellulose on talc flotation were studied through flotation tests，adsorption experiments and zeta potential measurements.. The results show that methylcellulose dissolved in water and hydrophobic interaction is the main driving force for adsorption at the low temperature. When the temperature increases, methylcellulose precipitation from solution and deposited on talc surface, the adsorption amount is large and the depression effect is strong. The depression effect of adsorbed methylcellulose layer on talc flotation is also affected by temperature. The switch of temperature from low to high results in decreased depression effect of methylcellulose and the change is reversible. The reason is that the hydroxyl of methylcellulose form hydrogen bonds with water molecules at low temperature, leading to a hydrophilic mineral surface and strong depression effect on talc. When the temperature rises, methylcellulose molecules lose water and the water content decreases, the depression effect to talc also decreases.
Key words: talc; flotation; temperature; methylcellulose; stimulus response
