Adsorption Kinetics and Thermodynamics of O-isopropyl-N, N-diethyl Thionocarbamate on Chalcopyrite Surfaces
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摘要:
O-异丙基-N，N-二乙基硫氨酯（XBE）是课题组研发的一种新型硫氨酯捕收剂，具有较好的铜硫浮选分离效果。为了进一步研究XBE的浮选性能，研究了搅拌时间、药剂浓度、pH值和温度等对XBE在黄铜矿表面吸附量的影响，并进行了吸附动力学和热力学分析。结果表明，pH值在7~11之间，XBE在黄铜矿表面的吸附量基本不变，搅拌25 min后XBE在黄铜矿表面达到吸附平衡，吸附过程符合二级反应动力学方程。随着药剂浓度的增加和温度的升高吸附量增大，XBE在黄铜矿表面上的吸附符合Freundlich多层吸附模型。
Abstract:O-isopropyl-N, N-diethyl thionocarbamate (XBE) is a new collector developed by the research group, which has good flotation separation effect for copper and sulfur. In order to further study the flotation performance of XBE, the effects of stirring time, reagent concentration, pulp pH and temperature on adsorption capacity of XBE onto chalcopyrite surfaces were studied. The adsorption kinetics and thermodynamics were investigated. The results show that adsorption capacity of XBE on chalcopyrite surfaces didn't change basically when the pH was between 7 and 11. After stirring for 25 minutes, adsorption equilibrium of XBE on chalcopyrite surfaces was reached, and adsorption process conformed to the second-order reaction kinetic equation. The adsorption capacity of XBE on chalcopyrite surfaces increased with the increase of reagent concentration and temperature. The adsorption of XBE on chalcopyrite surfaces conformed to Freundlich multilayer adsorption model.
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Key words:
- thionocarbamate /
- chalcopyrite /
- adsorption kinetics /
- thermodynamics
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表 1 Langmuir和Freundlich等温线吸附方程
Table 1. Langmuir and Freundlich adsorption isotherm equation
温度/K Langmuir Freundlich 回归方程 $\frac{{{K_L}}}{{{\rm{L}}/{\rm{mg}}}}$ $\frac{{{Q_m}}}{{{\rm{mg}}/{\rm{g}}}}$ R2 回归方程 $\frac{{{K_F}}}{{{\rm{mg}}/{\rm{g}}}}$ n R2 283 y=0.809x+53.76 0.015 1.236 0.27 y=0.791x-1.60 0.025 1.26 0.96 293 y=0.549x+24.80 0.022 1.821 0.63 y=0.818x-1.33 0.047 1.22 0.98 303 y=0.426x+15.98 0.027 2.347 0.72 y=0.795x-1.13 0.074 1.26 0.99 
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