Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

您目前所在的位置:首页 - 期刊简介 - 详细页面

中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第29卷    第7期    总第244期    2019年7月

[PDF全文下载]    [Flash在线阅读]    

    

文章编号:1004-0609(2019)-07-1497-12
壳聚糖选择性吸附分离镍、钴新过程
邹小平1, 2,王海北1, 2,王宏岩3, 4,黄 凯4,李 平3

(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
)

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Ni2+和Co2+与壳聚糖上氨基的络合能力差异达到Ni2+、Co2+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60 μm的层状成型壳聚糖;成型壳聚糖对Ni2+、Co2+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Ni2+的吸附为吸热反应,而对Co2+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Ni2+、Co2+发生结合反应。以萃取分离后得到的高Co2+低Ni2+溶液为原料,成型壳聚糖吸附后溶液中Ni2+含量由73×10-6降低至30×10-6,实现杂质的深度脱除。

 

关键词: 镍;钴;吸附;选择性分离;壳聚糖;改性

Selective adsorption separation of Ni and Co by modified chitosan
ZOU Xiao-ping1, 2, WANG Hai-bei1, 2, WANG Hong-yan3, 4, HUANG Kai4, LI Ping3

1. Beijing General Research Institute of Mining & Metallurgy, Beijing 100160, China;
2. School of Metallurgy, Northeastern University, Shenyang 110006, China;
3. National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
4. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China

Abstract: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 Ni2+ and Co2+ 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 Ni2+ and Co2+ 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 Ni2+ uptake onto modified chitosan is endothermic while the Co2+ uptake is exothermic. The adsorption mechanism shows that the Ni2+ and Co2+ are chelated with amino and hydroxyl groups of modified chitosan. In the specific application, Ni2+ content of high concentrated Co2+ solutions decreases from 73×10-6 to 30×10-6, realizing the selective separation of Ni.

 

Key words: nickel and cobalt; adsorption; selective separation; chitosan; modification

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

主管:中国科学技术协会 主办:中国有色金属学会 承办:中南大学
湘ICP备09001153号 版权所有:《中国有色金属学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市岳麓山中南大学内 邮编:410083
电 话:0731-88876765,88877197,88830410   传真:0731-88877197   电子邮箱:f_ysxb@163.com