首页|新型协萃体系从有害废弃物浸出液中萃取回收镍

新型协萃体系从有害废弃物浸出液中萃取回收镍

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从Mn2+、Ca2+和Mg2+中选择性萃取分离Ni2+,可解决含有价金属的有害废弃物资源化利用的瓶颈问题.以Aliquat 336为改性剂,研究了 Mextral 984H/Isononanoic acid/Aliquat 336协萃体系萃取、洗涤和反萃取平衡pH等温线.结果表明,在温度25 ℃,Aliquat 336体积分数为1%,萃取平衡pH=5.0条件下,Ni2+的萃取率为96.3%;反萃取平衡pH=1.0时,Ni2+的反萃取率为97.5%;改性剂Aliquat 336能显著提高羟肟/羧酸协萃体系对Ni2+的反萃取动力学性能.通过三级逆流萃取、两级洗涤工艺试验得到的载镍有机相在O/A=10下,以150 g/L H2SO4反萃液进行三级反萃,富镍反萃液中Ni2+含量达到30 g/L左右.Mextral 984H/Isononanoic acid协萃体系萃取镍的机理为离子交换反应,萃合物的结构可能为NiA2(HL)2.
Extractive Recovery of Nicke from Hazardous Waste Leaching Solution with the New Synergistic Extraction System
Selective extraction and separation of Ni2+from Mn21,Ca2+and Mg2+were found to be a bottleneck in the resource utilisation of hazardous wastes containing valuable metals.The extraction,washing,and stripping equilibrium pH isotherms of a synergistic extraction system consisting of Mextral 984H/Isononanoic acid were investigated using Aliquat 336 as a modifier.The results shows that at the temperature of 25 ℃,with a volume fraction of Aliquat 336 was 1%and the extraction equilibrium pH of 5.0,the extraction rate of Ni2+was 96.3%.Under the condition of stripping equilibrium pH of 1.0,the stripping rate of Ni2+reaches 97.5%.The modifier Aliquat 336 significantly improve the stripping kinetics of the Hydroxamic acid/carboxylic acid synergistic system for Ni2+.The nickel-loaded organic phase obtained by three-stage countercurrent extraction and two-stage scrubbing process was subjected to three-stage stripping with 150 g/L H2SO4 at O/A=10,and the Ni2+content in the nickel-rich stripping solution is about 30 g/L.The mechanism of Ni2+extraction with Mextral 984H/Isononanoic acid synergistic extraction system is a ion-exchange reaction,and the structure of the Ni-complex is probably the NiA2(HL)2.

synergistic extractionseparation and purificationhazardous wastestripping kineticsnickel extraction

程迎禧、夏兴良、林宏飞、王树飞、朱宗强、朱红祥

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桂林理工大学,广西环境污染控制理论与技术重点实验室,广西桂林 541006

广西生态环保现代产业学院,广西桂林 541006

安徽博世科环保科技股份有限公司,安徽宁国 530000

广西大学土木建筑工程学院,南宁 530004

广西博世科环境科技有限公司,南宁 530007

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协同萃取 分离纯化 有害废弃物 反萃动力学 镍萃取

2024

有色金属工程
北京矿冶研究总院

有色金属工程

CSTPCD北大核心
影响因子:0.432
ISSN:2095-1744
年,卷(期):2024.14(11)