In this work, we investigated leaching of lanthanide and yttrium (REY) from a Central Appalachian coal and its ashes obtained at 550–950 °C with the main purpose of understanding the impact of ashing temperature on REY leachability in water, ammonium sulfate, and hydrochloric acid. It is found that the coal contains a negligible amount of water-soluble REY, less than 1% ion-exchangeable REY, and about 28% of HCl-soluble REY. Ashing leads to dramatic changes in REY leachability in both ammonium sulfate and hydrochloric acid solutions, which is believed to be related to transformation and redistribution of organically-associated REY in coal during the ashing process. Ashing temperature significantly affects REY leaching from coal ashes; higher ashing temperature results in lower REY leachability in both solutions. Clay minerals may play a significant role in changing the leachability of REY after ashing. In addition, the results also suggest that the organic matter in the coal is relatively enriched in heavy REY.

在这项工作中，我们研究了中阿巴拉契亚煤中镧系元素和钇 (REY) 的浸出及其在 550-950 °C 下获得的灰烬，主要目的是了解灰化温度对 REY 在水中、硫酸铵和盐酸。发现煤中含有可忽略量的水溶性 REY、少于 1% 的可离子交换 REY 和约 28% 的 HCl 可溶性 REY。灰化导致硫酸铵和盐酸溶液中 REY 的可浸出性发生显着变化，这被认为与灰化过程中煤中有机相关 REY 的转化和再分配有关。灰化温度显着影响 REY 从煤灰中的浸出；较高的灰化温度导致两种溶液中较低的 REY 浸出性。粘土矿物可能在改变灰化后 REY 的浸出性方面发挥重要作用。此外，研究结果还表明，煤中的有机质相对富集重稀土元素。