(1. 江西理工大學(xué) 資源與環(huán)境工程學(xué)院，贛州 341000；
2. 西部礦業(yè)股份有限公司 博士后科研工作站，西寧 810000)
摘 要: 通過(guò)浮選試驗(yàn)、吸附試驗(yàn)及動(dòng)電位測(cè)試，研究不同溫度下甲基纖維素在滑石表面的吸附行為，考察溫度對(duì)滑石表面已吸附的甲基纖維素抑制效果的影響。結(jié)果表明：當(dāng)溫度較低時(shí)，甲基纖維素溶解在水中，通過(guò)疏水作用吸附在滑石表面，吸附量較低，對(duì)滑石的抑制效果較弱；隨著溫度升高，甲基纖維素從溶液中析出，沉積在滑石表面，吸附量較大，抑制效果較強(qiáng)。已經(jīng)吸附在滑石表面的甲基纖維素的抑制效果也受溫度影響，溫度升高會(huì)導(dǎo)致吸附的甲基纖維素層的抑制效果減弱，且這種變化是可逆的，溫度再降低會(huì)使甲基纖維素吸附層的抑制效果再次增強(qiáng)，這是由于溫度較低時(shí)滑石表面吸附的甲基纖維素通過(guò)羥基與水分子形成氫鍵而結(jié)合，導(dǎo)致礦物表面親水性較強(qiáng)，從而對(duì)滑石產(chǎn)生較強(qiáng)的抑制作用；當(dāng)溫度升高時(shí)，甲基纖維素分子失去結(jié)合水，含水量降低，對(duì)滑石抑制效果減弱。
關(guān)鍵字: 滑石；浮選；溫度；甲基纖維素；應(yīng)激反應(yīng)
（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
