分级化学沉淀法从酸性矿山废水中回收稀土元素试验研究
Recovery of Rare Earth Elements from Acid Mine Drainage Using Staged Chemical Precipitation
谢义曦 1吴攀 2李学先 3黄家琰 4陈雪1
作者信息
- 1. 贵州大学农学院,贵州贵阳 550025
- 2. 贵州大学资源与环境工程学院,贵州贵阳 550025;喀斯特地质资源与环境教育部重点实验室,贵州贵阳 550025
- 3. 贵州大学农学院,贵州贵阳 550025;喀斯特地质资源与环境教育部重点实验室,贵州贵阳 550025
- 4. 贵州大学资源与环境工程学院,贵州贵阳 550025
- 折叠
摘要
酸性矿山废水(AMD)因含有较高浓度的溶解稀土元素(REY)而倍受关注,从AMD中回收REY是极具潜力的稀土补充来源.为探究从AMD中回收REY的可行性,本研究从贵州某废弃煤矿井采集REY含量为29.8×10-6的AMD作为原料,采用分级化学沉淀—酸溶解—草酸选择性沉淀法回收AMD中的REY.试验结果表明,以NaOH作为pH调节剂,在去除AMD中99.8％的Fe3+和67.1％的Al3+等主要污染离子后,获得高度富集REY(含量约1.0％)的沉淀物.沉淀物经HNO3溶解后得到富含REY的预浓缩液,加入草酸溶液,最优pH为2时,回收了浓缩液中95％的REY.将最终产物煅烧氧化后得到纯度为97％的稀土氧化物.
Abstract
Acid mine drainage(AMD)is of great interest because of its high concentration of dissolved rare earth elements and yttrium(REY),and the recovery of REY from AMD is a potential source of rare earth re-plenishment.To investigate the feasibility of recovering REY from AMD,AMD with REY content of 29.8x10-6 was collected from an abandoned coal mine shaft in Guizhou as raw material in this study,and a graded chemi-cal precipitation-acid dissolution-oxalic acid selective precipitation method was used to recover REY from AMD.experimental results show that using NaOH as pH adjuster after removing 99.8％of Fe3+and 67.1％of Al3+and other major contaminating ions from AMD,a highly enriched precipitate(about 1.0％content)of REY was ob-tained.The precipitate was dissolved by HNO3 to obtain a REY-rich preconcent rate,and 95％of the REY in the concentrate was recovered by adding oxalic acid solution at an optimal pH of 2.The final product was cal-cined and oxidized to obtain rare earth oxides with a purity of 97％.
关键词
酸性矿山废水/稀土元素/分级化学沉淀/稀土回收Key words
acid mine drainage/rare earth elements/chemical precipitation/rare earth recovery引用本文复制引用
基金项目
贵州省科技计划(黔科合支撑[2021]一般466)
贵州省高层次人才培养计划(黔科合平台人才[2016]5664)
贵州大学培育项目(贵大培育[2020]30号)
出版年
2024
NETL
NSTL
万方数据