摘要
以镍钴铁粉经硫酸氧化浸出所得浸出液为研究对象,调整电位后采用中和沉淀法优先去除溶液中的Al^(3+)和Cr^(3+),实现Fe^(2+)与Al^(3+)高效分离,净化液再经氧化后采用磷酸沉铁制备水合磷酸铁产品,富镍钴的净化液再用于制备氢氧化镍钴。结果表明,在溶液pH=4.5、反应温度25℃、反应时间10min条件下,Al和Cr去除率分别为100%和97.15%,Fe损失率为2.42%;净化液在溶液pH值2.1、沉淀时间10min、沉淀温度25℃条件下沉铁,Fe沉淀率为97.30%,Ni和Co损失率分别为0.36%和0.64%;沉淀产物为无定形且带结晶水的磷酸铁,经700℃煅烧2h后转变为无水FePO_(4),其杂质含量和铁磷比符合HG/T4701—2021中Ⅰ型无水磷酸铁的标准。
The leachate obtained from the oxidation leach of nickel-cobalt-iron powder with sulfuric acid was taken in the study for preparing iron phosphate.After potential adjustment,Al^(3+)and Cr^(3+)in the leachate were removed by neutralization and precipitation to achieve an efficient separation of Fe^(2+)and Al^(3+).The purified solution was then oxidized and used to prepare ferric phosphate hydrate by iron precipitation with phosphoric acid.Finally,the purified Ni-Co-rich solution was used to prepare nickel-cobalt hydroxide.It is found that firstly,with pH of the leachate at 4.5,10 min of reaction at 25℃can lead to the removal rates of Al and Cr reaching 100%and 97.15%,with loss rate of Fe at 2.42%;secondly,the obtained purified solution is subjected to 10-min iron precipitation at 25℃with pH of 2.1,resulting in iron precipitation rate of 97.30%,loss rates of Ni and Co at 0.36%and 0.64%,respectively;the precipitate,amorphous iron phosphate with water of crystallization,is then subjected to 2-h calcination at 700℃and converted to anhydrous FePO_(4),with both impurity content and iron-phosphorus ratio up to the standard of type I anhydrous iron phosphate in HG/T 4701—2021.
作者
胡美世
陈靖
罗骏
李光辉
彭志伟
张鑫
陈彦虎
饶明军
HU Meishi;CHEN Jing;LUO Jun;LI Guanghui;PENG Zhiwei;ZHANG Xin;CHEN Yanhu;RAO Mingjun(School of Minerals Processing&Bioengineering,Central South University,Changsha 410083,Hunan,China)
出处
《矿冶工程》
北大核心
2025年第1期97-102,共6页
Mining and Metallurgical Engineering
基金
国家自然科学基金(52174288,51804346)。
关键词
磷酸盐沉淀法
磷酸铁
氧化浸出
沉铁
除杂
镍钴铁
氢氧化镍钴
phosphate precipitation
iron phosphate
oxidation leach
iron precipitation
impurity removal
nickel-cobalt-iron
mixed hydroxide precipitate(MHP)
