温度对油酸钠在一水硬铝石表面的吸附量的影响  

Effects of temperature on adsorption amount of sodium oleate on surface of diaspore

作　　者：冯其明[1] 肖亚雄[1] 卢毅屏[1] 

机构地区：[1]中南大学资源加工与生物工程学院,长沙410083

出　　处：《中国有色金属学报》2015年第9期2582-2587,共6页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(51174229);湖南省战略金属矿产资源清洁高效利用协同创新中心支持

摘　　要：通过吸附量的测定、热力学分析及单矿物浮选试验,揭示温度对油酸钠在一水硬铝石表面的吸附量及其浮选的影响。结果表明:在15℃时,油酸钠在一水硬铝石表面的吸附等温线为L-S型吸附曲线;在32℃时,其为L型吸附曲线。初始浓度在2 mmol/L以下时,油酸钠在一水硬铝石表面为单分子层吸附,吸附热约为-89.31k J/mol,属化学吸附,32℃时的吸附量高于15℃时的,ΘΔ15℃G<Θ2Δ3℃G,温度的降低导致油酸钠的吸附量减少,主要是油酸钠的溶解度降低所致;低温下,增加矿浆温度比增大捕收剂用量能更有效地提高油酸钠吸附量及浮选回收率。The effects of temperature on the adsorption amount of on the surface of diaspore and its floatation efficiency were revealed by adsorption measurement, thermodynamical analysis and single mineral flotation. The results indicate that, when temperature is 15 ℃, the adsorption isotherm of sodium oleate on aluminum-silicate minerals is L-S type, while it transfers to L type when temperature is 32 ℃. When the initial concentration is less than 2 mmol/L, the adsorption of sodium oleate on diaspore is monolayer adsorption with about -89.31 kJ/mol adsorption heat, which belongs to the chemical adsorption. The adsorption quantity of sodium oleate at 32℃ is higher than that at 15 ℃. However, ΔGΘ15℃ 〈 ΔGΘ32℃, it can be inferred that the decrease of the adsorption amount of sodium oleate might be caused by the reduced solubility of sodium oleate at low temperature. At low temperature, raising the pulp temperature is more effective than raising the collector dosage to improve the adsorption amount of sodium oleate and the recovery rate of diaspore flotation.

关 键 词：温度 油酸钠 吸附量 吸附热力学 

分 类 号：TD95[矿业工程—选矿]