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首页> 外文期刊>RSC Advances >Free oxoanion theory for BaMgAl10O17:Eu2+ structure decomposition during alkaline fusion process
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Free oxoanion theory for BaMgAl10O17:Eu2+ structure decomposition during alkaline fusion process

机译：碱性熔融过程中BaMgAl10O17：Eu2 +结构分解的游离氧阴离子理论

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摘要

The alkaline fusion process is a useful pretreatment for rare earth elements (REEs) recycling from blue phosphor (BaMgAl10O17:Eu2+, BAM), but the lack of basic theory affects the further development of the alkaline fusion process. Different substances (KOH, NaOH, Ca(OH)(2), NaCl, Na2CO3, and Na2O2) were chosen to react with BAM to explain the alkaline fusion process; only KOH, NaOH, Na2CO3, and Na2O2 can damage the BAM structure. The BAM alkaline fusion reactions share similar processes. Europium and magnesium ions were bonded with free oxoanion (OH-, CO32-, O-2(2-)) preferentially to escape from the BAM structure. The remaining structure of barium aluminate eventually decomposed into aluminate and BaCO3 in air. Cations (Na+, K+) were introduced to bond with the aluminate ions to maintain the charge balance of the reaction system. Free Oxoanion Theory (FOAT) was summarized to elucidate the structure decomposition process of BAM. The variation principle of determined lattice energy was in agreement with the FOAT analysis results. FOAT is very beneficial for the REEs recycling mechanism and alkaline fusion technology theory.
机译：碱性熔融过程是从蓝色磷光体（BaMgAl10O17：Eu2 +，BAM）回收稀土元素（REE）的有用预处理，但是缺乏基本理论会影响碱性熔融过程的进一步发展。选择了不同的物质（KOH，NaOH，Ca（OH）（2），NaCl，Na2CO3和Na2O2）与BAM反应以解释碱性熔融过程。只有KOH，NaOH，Na2CO3和Na2O2会损坏BAM结构。 BAM碱性熔融反应具有相似的过程。 free和镁离子优先与游离氧阴离子（OH-，CO32-，O-2（2-））结合，以逃脱BAM结构。铝酸钡的剩余结构最终在空气中分解成铝酸盐和BaCO3。引入阳离子（Na +，K +）与铝酸盐离子键合以维持反应系统的电荷平衡。总结了游离氧阴离子理论（FOAT），以阐明BAM的结构分解过程。确定的晶格能量的变化原理与FOAT分析结果一致。 FOAT对于REEs的回收机制和碱性聚变技术理论非常有益。

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