摘要
为了研究钕铁硼废料浸出前后的工艺矿物学,将钕铁硼废料在650℃下焙烧2 h,而后用4 mol/L的盐酸浸出,得到浸出渣。通过XRF、XRD、XPS和SEM-EDS对焙烧产物和浸出渣进行表征。实验结果表明:焙烧产物中主要由Fe_(2)O_(3)、Fe_(3)O_(4)、SiO2、NdFeO_(3)和Nd_(2)O_(3)等物质组成,且焙烧产物中稀土含量为16.40%;浸出后,浸出渣中无NdFeO_(3)、Nd_(2)O_(3)两种物质,稀土含量仅为0.66%。在XPS检测中,Fe以Fe(Ⅱ)和Fe(Ⅲ)两种价态存在于焙烧产物中,说明此温度下Fe没有被完全氧化成Fe(Ⅲ),仍有部分Fe(Ⅱ)存在;渣中除Fe(Ⅲ)外同样检测出Fe(Ⅱ),说明浸出过程并没有将Fe(Ⅱ)完全除去。本实验进一步完善了钕铁硼废料浸出理论,对未来钕铁硼的回收具有一定的指导意义。
In order to study the process mineralogy of NdFeB waste before and after leaching,it was roasted at 650℃for 2 h,and then leached with 4 mol/L hydrochloric acid to obtain leaching residues.The calcination products and leaching residues were characterized by XRF,XRD,XPS and SEM-EDS.The experimental results showed that the calcined products were mainly composed of Fe_(2)O_(3),Fe_(3)O_(4),SiO_(2),NdFeO_(3)and Nd_(2)O_(3),and the content of rare earth in these products was 16.40%.After leaching,there was no NdFeO_(3)and Nd_(2)O_(3)in the residues,and the content of rare earth was only 0.66%.In XPS detection,Fe existed in the roasting products in two valence states of Fe(Ⅱ)and Fe(Ⅲ),indicating that Fe was not completely oxidized into Fe(Ⅲ)at this temperature,and there was still some Fe(Ⅱ).Fe(Ⅱ)was also detected in the slag besides Fe(Ⅲ),indicating that Fe(Ⅱ)was not completely removed in the leaching process.This experiment further improves the leaching theory of NdFeB waste and is quite useful for guiding the recovery of NdFeB in the future.
作者
刘庆生
肖浩
邱廷省
LIU Qingshenga;XIAO Haoa;QIU Tingsheng(Faculty of Materials Metallurgy and Chemistry,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China;School of Resources and Environmental Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China)
出处
《有色金属科学与工程》
CAS
北大核心
2022年第6期127-133,共7页
Nonferrous Metals Science and Engineering
基金
“十三五”国家重点研发计划资助项目(2018YFC1903402)。
