壳聚糖选择性吸附分离镍、钴新过程  

Selective adsorption separation of Ni and Co by modified chitosan

作　　者：邹小平[1,2] 王海北 王宏岩[3,4] 黄凯 李平[3] ZOU Xiao-ping;WANG Hai-bei;WANG Hong-yan;HUANG Kai;LI Ping(Beijing General Research Institute of Mining & Metallurgy,Beijing 100160,China;School of Metallurgy,Northeastern University,Shenyang 110006,China;National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China;School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京矿冶研究总院,北京100160 [2]东北大学冶金学院,沈阳110006 [3]中国科学院过程工程研究所湿法冶金清洁生产技术国家工程实验室,北京100190 [4]北京科技大学冶金与生态制造工程学院,北京100083

出　　处：《中国有色金属学报》2019年第7期1497-1508,共12页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(51574212,U1403195)~~

摘　　要：本文以成型壳聚糖为吸附剂进行溶液中Ni-Co的分离,通过Ni^2+和Co^2+与壳聚糖上氨基的络合能力差异达到Ni^2+、Co^2+分离的目的。结果表明:利用NaOH与壳聚糖醋酸溶液可制备出粒度约为60m的层状成型壳聚糖;成型壳聚糖对Ni^2+、Co^2+的吸附符合拟二级动力学方程和Freundlich方程;经吸附焓变计算发现成型壳聚糖对Ni^2+的吸附为吸热反应,而对Co^2+的吸附为放热反应;吸附机理表明,壳聚糖上的氨基和羟基与Ni^2+、Co^2+发生结合反应。以萃取分离后得到的高Co^2+低Ni^2+溶液为原料,成型壳聚糖吸附后溶液中Ni^2+含量由73×10^-6降低至30×10^-6,实现杂质的深度脱除。Ni and Co are difficult from separation due to their similar physicochemical properties.Based on the difference in complexation ability between ammonia and Ni/Co,selective separation of Ni^2+ and Co^2+ was conducted by using modified chitosan as adsorbent with amino group.The results show that the modified chitosan with the size of 60 μm can be prepared by mixing chitosan-acetic acid solution with NaOH.The adsorption behavior of Ni^2+ and Co^2+ onto modified chitosan,including adsorption isotherm and kinetics,is fitted well by Freundlich model and pseudo-second- order model,respectively.Adsorption enthalpy results indicate that the Ni^2+ uptake onto modified chitosan is endothermic while the Co^2+ uptake is exothermic.The adsorption mechanism shows that the Ni^2+ and Co^2+ are chelated with amino and hydroxyl groups of modified chitosan.In the specific application,Ni^2+ content of high concentrated Co^2+ solutions decreases from 73×10^-6 to 30×10^-6,realizing the selective separation of Ni.

关 键 词：镍 钴 吸附 选择性分离 壳聚糖 改性 

分 类 号：TF815[冶金工程—有色金属冶金]