摘要:
煤油是浮选辉钼矿常用的捕收剂,为了解其在浮选过程中与辉钼矿的相互作用,研究了时间、初始浓度、pH值等因素对煤油在辉钼矿表面的吸附与解吸行为的影响.结果表明,初始浓度为240 mg/L时,煤油在辉钼矿表面的吸附在前40 min较快,随后趋于缓慢,并在90 min时达到吸附平衡;随着初始浓度的增加,煤油在辉钼矿表面吸附量不断增大且不易解吸;强碱性环境不利于煤油在辉钼矿表面的吸附,且解吸比增至60%以上.采用准一级动力学模型及准二级动力学模型对试验数据进行拟合,通过误差分析评价模型拟合度,得出准二级动力学的线性形式和非线性形式都可以较好地描述辉钼矿吸附煤油的行为.
关键词:
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煤油
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辉钼矿
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吸附
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解吸
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动力学
Abstract:
Kerosene is widely used as a flotation collector in molybdenite flotation.To understand its interaction with molybdenite in flotation process, the effect of time, initial concentration and pH value on adsorption and desorption of kerosene onto molybdenite were studied in this paper.The results showed that when the initial concentration was 240 mg/L, the adsorption behavior was fast in the first 40 min, subsequently slowed down and finally reached equilibrium in 90 min.With the increase of initial concentration, the adsorption capacity of kerosene gradually increased.Adsorption process was inhibited in strong alkalis condition, with the desorption ratio beyond 60%.Furthermore, experimental data was analyzed by pseudo-first order adsorption kinetic model and pseudo-second order adsorption kinetic model, and error analysis was conducted to evaluate the model fitting.It was found that both the linear and nonlinear fitting of second-order kinetic model could well describe the adsorption behaviors of kerosene on molybdenite.
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