洁净煤技术

2019, v.25;No.124(06) 171-176

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煤粉对选矿废水中乙硫氮的吸附特性研究
Study on adsorption characteristics of diethyldithiocarbamate in mineral processing wastewater by coal

边岳;苏鑫;何红兴;杜丽伟;张静;
BIAN Yue;SU Xin;HE Hongxing;DU Liwei;ZHANG Jing;China Coal Research Institute Company of Energy Conservation;National Coal Water Mixture Engineering Technology Research Center;State Key Laboratory of Coal Mining and Clean Utilization;National Energy Technology and Equipment Laboratory of Coal Utilization and Emission Control;School of Chemical Engineering and Technology,China University of Mining and Technology;

摘要(Abstract):

为探究煤粉吸附剂对选矿废水中有机污染物的吸附过程,利用煤粉作为吸附剂用于选矿废水中乙硫氮污染物的吸附。研究煤粉吸附剂自身物理化学性质特点,并通过配制乙硫氮污染物模拟废水,研究煤粉投加量、吸附时间等吸附条件对吸附过程的影响,重点研究煤粉吸附剂吸附乙硫氮污染物的吸附等温线、吸附速率控制过程等。结果表明煤粉吸附剂表面结构复杂,具有丰富的孔隙结构和含氧官能团,是一种天然吸附剂。煤粉投加量和吸附时间是影响吸附效果的重要因素,随着煤粉投加量增加,溶液中乙硫氮去除率先增加后趋于稳定,吸附量不断减少;随着吸附时间延长,乙硫氮去除率和吸附量开始时增加比较迅速,吸附时间达到30 min后,去除率和吸附量均趋于稳定。乙硫氮溶液初始浓度50 mg/L,煤粉投加量5 g/L,振荡吸附时间30 min条件下,乙硫氮去除率达86.53%,吸附量为8.65 mg/g。利用Langmuir和Freundlich等温吸附模型拟合煤粉对乙硫氮的吸附行为,Freundlich等温吸附模型更加符合该吸附过程,说明其吸附行为是以表层为主的多层吸附。利用准一级动力学方程、准二级动力学方程和颗粒内部扩散模型进行吸附动力学研究,结果表明该吸附过程更加符合准二级动力学模型,吸附速率的控制步骤同时包含外部液膜扩散、表面扩散以及颗粒内部扩散过程,但以表面扩散为主导作用。
In order to explore the adsorption process of coal powder for organic pollutants on the wastewater from mineral processing,coal powder was used as an adsorbent to adsorb diethyldithiocarbamate in mineral processing wastewater. The physical and chemical properties of coal powder were investigated,and the adsorption conditions such as dosage and adsorption time on the adsorption process were explored through the preparation of simulated wastewater containing ethinyl sulfide nitrogen pollutant. In addition,the adsorption isotherms and adsorption rate control process of the adsorption of diethyldithiocarbamate by coal powder were emphatically studied. The results show that coal powder is a natural adsorbent with complex surface structure,abundant pore structure and oxygen-containing functional groups.The addition amount of coal powder and adsorption time are important factors affecting the adsorption effect. With the increase of the amount of coal powder,the removal rate of diethyldithiocarbamate in the solution first increases,then stabilizes,and the adsorption amount decreases continuously. With the increase of adsorption time,the removal rate and adsorption amount increase rapidly at the beginning,and/g respectively L and adsorption time 30 min. What is more,the Langmuir and Freundlich isotherm adsorption models are used to fit the adsorption behavior of pulverized coal to ethionine,and the Freundlich isotherm adsorption model is more consistent with the adsorption process,indicating that the adsorption behavior was multilayer adsorption based on surface. The adsorption kinetics is studied by using the quasi first order kinetic equation,the quasi second order kinetic equation and the particle internal diffusion model. The adsorption of diethyldithiocarbamate by coal powder is better in accordance with the Pseudo-second-order kinetic model. The control steps of the adsorption rate included external liquid film diffusion,surface diffusion and particle diffusion,but surface diffusion is the dominant factor.

关键词(KeyWords): 煤粉;废水;乙硫氮;等温吸附线;吸附动力学
coal powder;wastewater;diethyldithiocarbamate;absorption isotherm;adsorption kinetics

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作者(Author): 边岳;苏鑫;何红兴;杜丽伟;张静;
BIAN Yue;SU Xin;HE Hongxing;DU Liwei;ZHANG Jing;China Coal Research Institute Company of Energy Conservation;National Coal Water Mixture Engineering Technology Research Center;State Key Laboratory of Coal Mining and Clean Utilization;National Energy Technology and Equipment Laboratory of Coal Utilization and Emission Control;School of Chemical Engineering and Technology,China University of Mining and Technology;

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