摘要
为降低钕铁硼废料预处理成本,探讨利用盐酸润湿-空气自然氧化法对钕铁硼废料进行预处理,并对经盐酸润湿-空气自然氧化处理的钕铁硼废料中稀土的浸出工艺和浸出动力学进行研究.结果表明:以4 mol/L HCl润湿原料,在空气中放置20 d后铁的氧化率达到92.37%,可满足铁硼废料中稀土回收的前期处理工艺要求,降低生产成本;在浸出的过程中,当反应温度为363 K,盐酸浓度为2 mol/L、粒度为0.055~0.088 mm、液固比V_L/W_S=8∶1、搅拌速率500 r/min下,反应时间为60 min后经盐酸润湿-空气自然氧化Nd-Fe-B废料中稀土的浸出率可达89.36%;研究表明,钕铁硼废料中稀土浸出过程主要是受扩散控制,其表观化学反应活化能E=17.49 k J/mol.
This paper studied the NdFeB pretreatment with hydrochloric acid wetting and air oxidation to reduce the pretreatment cost of NdFeB scrap, and investigated the rare earth leaching process and leaching kinetics from NdFeB scrap by hydrochloric acid. The results show that the oxidation rate of iron in NdFeB scrap is up to 92.37 % after wetting with 4 mol/L HC1 and staying for 20 days in the air, which can meet the requirements of iron oxidation in the rare earth recovery and reduce the production cost; in the leaching process, when the reaction temperature is 363 k, the hydrochloric acid concentration is 2 mol/L, the particle size is of 0.055 mm to 0.088 ram, the ratio of Vu/Ws is 8：1, and the stirring speed is 500 r/min, the rare earth leaching rate from NdFeB scrap can reach 89.36 % after leaching for 60 rains. Studies also show that the rare earth leaching process from NdFeB scrap is followed the unreacted shrinking core model controlled by diffusion, and its apparent reaction activation energy is 17.49 kJ/mol.
作者
邓庚凤
吴继平
邓亮亮
潘贤斌
林声煌
黄立强
DENG Gengfeng WU Jiping DENG Liangliang PAN Xianbin LIN Shenghuang HUANG Liqiang(School of Metallurgical and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China)
出处
《有色金属科学与工程》
CAS
2017年第2期119-123,共5页
Nonferrous Metals Science and Engineering
基金
国家自然科学地区基金资助项目(51564022)
江西省大学生创新创业教育计划项目(201410407028)
关键词
钕铁硼废料
稀土回收
自然氧化
浸出动力学
NdFeB magnet scrap
rare earth recovery
natural air oxidation
leaching kinetics
