摘要
为满足新能源汽车动力电池对高纯度镍钴材料的需求,本研究针对镍钴氢氧化物沉淀(MHP)湿法精炼过程中镁及铁、铝、硅、铬等杂质元素去除的问题,开发了碳化预脱镁与酸溶液同步除杂工艺。通过考察反应温度、矿浆浓度、反应时间及CO_(2)用量对预脱镁率的影响,优化工艺参数。结果表明:在搅拌转速350 r/min、反应温度25℃、矿浆浓度20%、反应时间1 h、CO_(2)用量30 mL/min条件下,预脱镁率达59.39%,镍损失率低于1%。同步除杂试验中,控制终点pH值至5.5,双氧水辅助下,浸出液中Fe^(3+)、Al^(3+)、Si^(4+)、Cr^(3+)含量分别降至<1、45、47和2.3 mg/L,满足后续P204萃取深度除杂要求。该工艺通过前端预脱镁与同步除杂的协同作用,显著缩短了精炼流程,降低了生产成本,为MHP湿法精炼提供了技术支撑。
To meet the demand for high-purity nickel and cobalt materials in power batteries for new energy vehicles,this study developed a combined process of pre-removal of magnesium via carbonization and synchronous removal of impurities(Fe,Al,Si,Cr)from acid leaching solutions during the hydrometallurgical refining of Mixed Hydroxide Precipitate(MHP).The effects of reaction temperature,slurry concentration,reaction time,and CO_(2) dosage on magnesium removal efficiency were systematically investigated.Under optimized conditions(stirring speed 350 r/min,temperature 25℃,slurry concentration 20%,reaction time 1 h,CO_(2) flow rate 30 mL/min),the pre-removal rate of magnesium reached 59.39%,with nickel loss below 1%.In the synchronous impurity removal process,by controlling the terminal pH to 5.5 with hydrogen peroxide,the concentrations of Fe,Al,Si,and Cr in the leaching solution were reduced to<1 mg/L,45,47,and 2.3 mg/L,respectively,meeting the requirements for subsequent P204 solvent extraction.The synergistic integration of pre-removal and impurity elimination significantly shortens the refining process and reduces production costs,providing an efficient technical route for MHP purification.
作者
苏立峰
郑朝振
郭纵
秦树辰
周起帆
SU Lifeng;ZHENG Chaozhen;GUO Zong;QIN Shuchen;ZHOU Qifan(BGRIMM Technology Group,Beijing 100160,China)
出处
《有色金属(中英文)》
北大核心
2025年第8期1324-1329,共6页
Nonferrous Metals
基金
国家重点研发计划项目(2021YFC2902503)。
关键词
镍钴富集物
预脱镁
溶液除杂
mixed hydroxide precipitate
pre-removal magnesium
impurity removal
