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首页> 外文期刊>RSC Advances >Metal coordination in the high-temperature leaching of roasted NdFeB magnets with the ionic liquid betainium bis(trifluoromethylsulfonyl)imide
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Metal coordination in the high-temperature leaching of roasted NdFeB magnets with the ionic liquid betainium bis(trifluoromethylsulfonyl)imide

机译：离子液体双（三氟甲基磺酰基）酰亚胺铍在高温浸出NdFeB磁体中的金属配位

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Ionic liquids are largely used to leach metals from primary (ores) and secondary sources (end-of-life products). However, dry ionic liquids with a carboxylic function on the cation have not yet been used to leach metals at temperature above 100 °C and under atmospheric pressure. The ionic liquid betainium bis(trifluoromethylsulfonyl)imide, [Hbet][Tf _(2) N], was used in the dry state to recover neodymium, dysprosium and cobalt from NdFeB magnets and NdFeB production scrap. The magnets and the scrap were crushed, milled and roasted before being leached above 100 °C. Recovery efficiencies below 10% and a lack of selectivity for all the parameters tested pointed to the importance of water in the dissolution process. The influence of the viscosity of the ionic liquid and the composition of the metal oxides after roasting was investigated as well. Although the dissolution of pure metal oxides was faster than the dissolution of the magnets, the low leaching efficiencies could not be attributed to the composition and crystal structure of the samples, since magnets roasted with the same protocol have already been successfully leached in the past, albeit in the presence of water. The role of water on the mass transfer and on the coordination of the metals was studied by viscometry and by spectroscopic methods, respectively. It is shown that for leaching of rare earths with [Hbet][Tf _(2) N], the presence of ligands such as water is mandatory to saturate the first coordination sphere of the dissolved rare-earth ions. This paper provides new insights in the dissolution mechanism of metal oxides by [Hbet][Tf _(2) N] at leaching temperatures higher than those typically used in hydrometallurgical leaching processes.
机译：离子液体主要用于从主要（矿石）和次要来源（报废产品）中浸出金属。但是，尚未使用在阳离子上具有羧基功能的干燥离子液体在高于100°C的温度和大气压下浸出金属。离子液体双（三氟甲基磺酰基）酰亚胺铍[Hbet] [Tf _（2）N]以干燥状态用于从NdFeB磁铁和NdFeB生产废料中回收钕，和钴。将磁铁和废料压碎，研磨和烘烤，然后浸出至100°C以上。低于10％的回收效率和对所有测试参数的选择性缺乏表明了水在溶解过程中的重要性。还研究了焙烧后离子液体的粘度和金属氧化物的组成的影响。尽管纯金属氧化物的溶解速度快于磁体的溶解速度，但低浸出效率不能归因于样品的组成和晶体结构，因为过去已经成功地浸出了使用相同实验方案焙烧的磁体，尽管有水。分别通过粘度测定法和分光光度法研究了水在传质和金属配位中的作用。结果表明，对于用[Hbet] [Tf _（2）N]浸出稀土而言，诸如水之类的配体的存在对于饱和溶解的稀土离子的第一配位域是必不可少的。本文在浸出温度高于湿法冶金浸出过程中通常使用的浸出温度下，通过[Hbet] [Tf _（2）N]提供了金属氧化物溶解机理的新见解。

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