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Eco-Friendly Rare-Earth-Metal Recovering Process with High Versatility from Nd-Fe-B Magnets
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-01-10 , DOI: 10.1021/acssuschemeng.9b05996 Ryo Sasai 1, 2 , Nobuhiro Shimamura 3 , Takuya Fujimura 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-01-10 , DOI: 10.1021/acssuschemeng.9b05996 Ryo Sasai 1, 2 , Nobuhiro Shimamura 3 , Takuya Fujimura 1
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We investigated the recovery of rare-earth elements from three types of Nd-Fe-B sintered magnets (Nd-mags) to study the effectiveness of the wet-mechanochemical resource recovery technique. These magnets were of different chemical compositions and were studied via the wet-mechanochemical treatment using a H2SO4-(COOH)2 mixed reaction solution. A high recovery rate (R) and high purity of rare-earth elements in the collected precipitate (P) could be achieved by optimizing the H+/RE and oxalate/RE. H+/RE is defined as the molar ratio between the H+ amount in the added H2SO4 and the rare-earth content in the Nd-mag (RE); oxalate/RE is the molar ratio between the added amount of (COOH)2 and RE values. The optimum conditions were H+/RE ∼ 5–10 and oxalate/RE ∼ 10; simultaneously, the R and P values were approximately 97 and 100 mass %, respectively. We also investigated the particle size effect on the R and P values, and the optimum treatment time was determined to be more than 1 h. Furthermore, the power consumption of the wet-mechanochemical treatment under optimal conditions was about 0.2 kWh. Thus, it was found that the wet-mechanochemical technique is an effective and eco-friendly method for recovering rare-earth elements as oxalate with high purity from a Nd-mag.
中文翻译：
Nd-Fe-B磁铁具有高通用性的生态友好型稀土金属回收工艺
我们研究了从三种类型的Nd-Fe-B烧结磁体（Nd-mags）中回收稀土元素的方法，以研究湿式机械化学资源回收技术的有效性。这些磁体具有不同的化学组成，并通过使用H 2 SO 4-（COOH）2混合反应溶液的湿式机械化学处理进行了研究。通过优化H + / RE和草酸盐/ RE，可以实现高回收率（R）和高纯度的稀土元素（P）。H + / RE定义为添加的H 2 SO 4中H +量之间的摩尔比Nd-mag（RE）中的稀土含量；草酸盐/ RE是（COOH）2的添加量与RE值之间的摩尔比。最佳条件为H + / RE〜5-10和草酸盐/ RE〜10。同时，R和P值分别为约97质量％和100质量％。我们还研究了粒径对R和P的影响值，最佳治疗时间被确定为大于1小时。此外，在最佳条件下的湿式机械化学处理的功率消耗为约0.2kWh。因此，发现湿式机械化学技术是从Nd-mag中回收高纯度草酸稀土元素的有效且环保的方法。
更新日期：2020-01-10
中文翻译：
Nd-Fe-B磁铁具有高通用性的生态友好型稀土金属回收工艺
我们研究了从三种类型的Nd-Fe-B烧结磁体（Nd-mags）中回收稀土元素的方法，以研究湿式机械化学资源回收技术的有效性。这些磁体具有不同的化学组成，并通过使用H 2 SO 4-（COOH）2混合反应溶液的湿式机械化学处理进行了研究。通过优化H + / RE和草酸盐/ RE，可以实现高回收率（R）和高纯度的稀土元素（P）。H + / RE定义为添加的H 2 SO 4中H +量之间的摩尔比Nd-mag（RE）中的稀土含量；草酸盐/ RE是（COOH）2的添加量与RE值之间的摩尔比。最佳条件为H + / RE〜5-10和草酸盐/ RE〜10。同时，R和P值分别为约97质量％和100质量％。我们还研究了粒径对R和P的影响值，最佳治疗时间被确定为大于1小时。此外，在最佳条件下的湿式机械化学处理的功率消耗为约0.2kWh。因此，发现湿式机械化学技术是从Nd-mag中回收高纯度草酸稀土元素的有效且环保的方法。
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