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首页> 外文期刊>Fuel >Characterization and recovery of rare earth elements and other critical metals (Co, Cr, Li, Mn, Sr, and V) from the calcination products of a coal refuse sample
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Characterization and recovery of rare earth elements and other critical metals (Co, Cr, Li, Mn, Sr, and V) from the calcination products of a coal refuse sample

机译：从煤矸石样品的煅烧产物中表征和回收稀土元素和其他关键金属（CO，Cr，Li，Mn，Sr和V）

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The impacts of calcination on the leaching recovery of rare earth elements (REEs) and other critical metals from a Baker seam coal refuse material were investigated in this study. Acid leaching test results showed that leaching recovery of the REEs, especially the light REEs, was increased significantly from around 24% to 80-90% after calcination under 600-750 degrees C for two hours. By considering the major element leaching kinetics and the mineralogical changes of the dominant minerals caused by calcination, two mechanisms were proposed for the improved leaching performance: (1) decomposition of difficult-to-dissolve REE-bearing minerals into soluble forms; and (2) liberation of REE-bearing minerals encapsulated in clays after calcination due to the dehydration and disintegration of the layered clay structure. Sequential chemical extraction tests showed that a significant fraction (around 75%) of the REEs in the raw material were present in an insoluble form. After calcination under proper temperatures (600-800 degrees C), the majority of the insoluble light REEs (LREEs) were converted into soluble forms. Changes in the modes of occurrence of the LREEs and phosphorous based on leaching rate and sequential leaching correlated well as a function of the calcination temperature. This finding in addition to SEM-EDX results tends to indicate the potential that the LREEs occur primarily as rare earth phosphates such as monazite in the untreated coal refuse material. The acid leaching and sequential chemical extraction results show that co-extraction of REEs and other critical metals such as Co, Mn, and Li is possible using a calcination-acid leaching procedure.
机译：在本研究中研究了煅烧对稀土元素（REES）浸出回收的影响，从贝克煤层煤矸石材料中研究了来自面包煤层煤矸石材料的浸出回收。酸浸出试验结果表明，在600-750℃下煅烧两小时后，浸出芦页，尤其是光圈，特别是光圈，特别是在煅烧后的约24％至80-90％。通过考虑主要元素浸出动力学和由煅烧引起的主要矿物质的矿物学变化，提出了两种机制，提出了改善的浸出性能：（1）将难以溶解的胶雷矿物分解成可溶性形式; （2）由于层状粘土结构的脱水和崩解而在粘土中释放在粘土中封装的胶束矿物的释放。顺序化学提取试验表明，原料中的显着级分（约75％）以不溶性形式存在。在适当的温度下煅烧（600-800℃）后，将大部分不溶性光线REES（LEREE）转化为可溶性形式。基于浸出速率的猪肉和磷的发生模式的变化和序贯浸出良好的煅烧温度良好。此发现除了SEM-EDX结果之外还倾向于表示味精主要作为稀土磷酸盐如未处理的煤矸石材料中的稀土磷酸盐发生。酸浸出和顺序化学提取结果表明，使用煅烧酸浸出程序，可以共萃取REES和其他关键金属如CO，Mn和Li。

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