重庆大学学报2025，Vol.48Issue(2)：110-122,13.DOI:10.11835/j.issn.1000-582X.2024.256
机械活化强化硫酸锌溶液中锌粉净化除镉
Mechanical activation enhances cadmium purification from zinc powder in zinc sulfate solution
摘要
Abstract
Excessive zinc powder consumption and low cadmium content in purified cadmium removal residues are persistent challenges in cadmium removal from zinc sulfate solution via zinc powder replacement.The primary cause is the reduced reactivity of zinc powder due to encapsulation by product layers.To address this,a novel two-stage countercurrent replacement method with mechanical activation was proposed.This method involves adding low-coefficient zinc powder in the first stage to facilitate cadmium enrichment and high-coefficient zinc powder in the second stage to achieve the desired cadmium removal from zinc sulfate solutions,meeting solution purification standards.Experimental results show that,under optimal conditions(total zinc powder addition coefficient of 1.02,reaction temperature of 60 ℃,and reaction time of 60 min),using a primary zinc powder addition coefficient of 0.9 and a secondary zinc powder addition coefficient of 1.2 reduced cadmium concentration in the solution from 1 530 mg/L to 60-70 mg/L after the first stage.This process enriched the cadmium content in the primary purification residue to 81.54%,with zinc content below 10%.Following secondary purification,cadmium concentration in the solution further decreased to 2 mg/L to 5 mg/L,while the purification residue contained 16.09%cadmium and 56.04%zinc.Phase analysis revealed that the primary purification residue predominantly consisted of elemental cadmium,whereas the secondary residue contained unreacted zinc and some elemental cadmium.Compared with traditional primary purification methods,the introduction of fluid shear stress and mechanical activation effectively disrupted the encapsulation layer on zinc powder surfaces,eliminating the the wrapping effect,enhancing zinc powder utilization efficiency,reducing consumption,and increasing cadmium content in the purification residues.关键词
硫酸锌溶液/锌粉置换除镉/两级净化/流体剪应力/机械活化Key words
zinc sulfate solution/zinc powder replacement for cadmium removal/two-stage purification/fluid shear stress/mechanical activation分类
矿业与冶金引用本文复制引用
崔武江,曾鹏,甄勇,李兴彬,魏昶,罗兴国,周子豪..机械活化强化硫酸锌溶液中锌粉净化除镉[J].重庆大学学报,2025,48(2):110-122,13.基金项目
国家自然科学基金(52164039) （52164039）
云南省科技厅重大科技专项计划项目(202202AG050025) （202202AG050025）
云南省应用基础研究计划项目(202001AT070079).Supported by National Natural Science Foundation of China(52164039),Major Science and Technology Special Program of Yunnan Provincial Department of Science and Technology(202202AG050025),and Yunnan Provincial Applied Basic Research Program(202001AT070079). （202001AT070079）
