首页|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

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

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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.
Recovery of Rare Earth Elements from Acid Mine Drainage Using Staged Chemical Precipitation
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%.

acid mine drainagerare earth elementschemical precipitationrare earth recovery

谢义曦、吴攀、李学先、黄家琰、陈雪

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贵州大学农学院,贵州贵阳 550025

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

酸性矿山废水 稀土元素 分级化学沉淀 稀土回收

贵州省科技计划贵州省高层次人才培养计划贵州大学培育项目

黔科合支撑[2021]一般466黔科合平台人才[2016]5664贵大培育[2020]30号

2024

中国稀土学报
中国稀土学会 北京有色金属研究总院

中国稀土学报

CSTPCD北大核心
影响因子:1.175
ISSN:1000-4343
年,卷(期):2024.42(2)
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