D301树脂动态吸附溴离子过程探究及模型拟合  

Performance and modelling of bromide dynamic adsorption onto D301 anion exchange resin

作　　者：袁纯怡 孙玉柱[1,2,3] 杨颖 宋兴福[1,2] 于建国[1,2] Chunyi YUAN;Yuzhu SUN;Ying YANG;Xingfu SONG;Jianguo YU(National Engineering Research Center for Integrated Utilization of Salt Lake Resource,East China University of Science and Technology,Shanghai 200237,China;Engineering Research Center of Resources Process Engineering,Ministry of Education,Shanghai 200237,China;Shanghai Institute of Pollution Control and Ecological Security,Shanghai 200092,China)

机构地区：[1]国家盐湖资源综合利用工程技术研究中心,华东理工大学,上海200237 [2]资源过程工程教育部工程研究中心,上海200237 [3]上海污染控制与生态安全研究院,上海200092

出　　处：《过程工程学报》2020年第6期655-666,共12页The Chinese Journal of Process Engineering

基　　金：National Key R&D Program of China(No.2016YFC0401203);Program of Shanghai Academic/Technology Research Leader(No.18XD1424600)。

摘　　要：研究了用D301树脂吸附岩盐矿提钾母液中溴离子的可能性,考察了吸附柱动态吸附过程中原料液溴离子初始浓度、床层高度及进料流速等因素的影响。结果表明,增加原料液溴离子初始浓度或降低进料流速能提高树脂单位饱和吸附量。当原料液溴离子初始浓度从1000 mg/L升至4000 mg/L时,树脂单位饱和吸附量从1.8 mg/L增至6.4 mg/mL。增加床层高度或降低进料流速会延长动态吸附突破时间及饱和时间,而原料液溴离子初始浓度对其没有影响。应用了Bed Depth Service Time(BDST),Thomas,Yoon-Nelson,Wolborska及Modified dose response(MDR)等五种吸附模型对动态吸附过程进行拟合,其中MDR模型的拟合效果最佳。D301树脂可用于从含有高浓度氯离子的提钾母液中提取溴离子。The adsorption of bromide ions from the mother liquor produced during the process of mining potassium from rock-salt mines onto D301 anion exchange resin in a Perspex column was investigated.Relevant breakthrough curves were obtained,which would provide valuable information for the process design at a real scale.Experiments were carried out to study the effects of the initial adsorbate concentration,bed length,and flow rate.The bed capacities were found to increase with increasing initial adsorbate concentration and decreasing flow rate.When the initial Br-concentration increased from 1000 mg/L to 4000 mg/L,the adsorption capacity increased from 1.8 mg/mL to 6.4 mg/mL.The breakthrough time and the exhaust time increased with increasing bed length and decreasing flow rate,whereas they remained almost the same when changing the initial adsorbate concentration.Five adsorption models,including Bed Depth Service Time(BDST),Thomas,Yoon-Nelson,Wolborska and Modified dose response(MDR)were applied to predict the breakthrough curves and to determine the characteristic parameters of fixed-bed column.The MDR model was found to be the best fit to the experimental data.This study indicates that the D301 anion exchange resin can be used to extract bromide ions from mother liquors effectively in the competition with high concentrations of chloride ions.

关 键 词：阴离子交换树脂 突破曲线 溴 模型拟合 Modified dose response模型 

分 类 号：O647.3[理学—物理化学]