Weshahy Ahmed R, Gouda Ayman A, Atia Bahig M, Sakr Ahmed K, Al-Otaibi Jamelah S, Almuqrin Aljawhara, Hanfi Mohamed Y, Sayyed M I, El Sheikh Ragaa, Radwan Hend A, Hassen Fatma S, Gado Mohamed A
Department of Chemistry, Faculty of Science, Zagazig University, Zagazig 44519, Egypt.
Nuclear Materials Authority, El Maadi, Cairo P.O. Box 530, Egypt.
Nanomaterials (Basel). 2022 Jul 5;12(13):2305. doi: 10.3390/nano12132305.
Considering how important rare earth elements (REEs) are for many different industries, it is important to separate them from other elements. An extractant that binds to REEs inexpensively and selectively even in the presence of interfering ions can be used to develop a useful separation method. This work was designed to recover REEs from spent nickel-metal hydride batteries using ammonium sulfate. The chemical composition of the Ni-MH batteries was examined. The operating leaching conditions of REE extraction from black powder were experimentally optimized. The optimal conditions for the dissolution of approximately 99.98% of REEs and almost all zinc were attained through use of a 300 g/L (NH)SO concentration after 180 min of leaching time and a 1:3 solid/liquid phase ratio at 120 °C. The kinetic data fit the chemical control model. The separation of total REEs and zinc was conducted under traditional conditions to produce both metal values in marketable forms. The work then shifted to separate cerium as an individual REE through acid baking with HCl, thus leaving pure cerium behind.
考虑到稀土元素（REEs）对许多不同行业的重要性，将它们与其他元素分离很重要。一种即使在存在干扰离子的情况下也能廉价且选择性地与稀土元素结合的萃取剂可用于开发一种有用的分离方法。这项工作旨在使用硫酸铵从废旧镍氢电池中回收稀土元素。对镍氢电池的化学成分进行了检测。通过实验优化了从黑粉中提取稀土元素的操作浸出条件。在120℃下，经过180分钟的浸出时间，使用300 g/L的（NH）₂SO₄浓度以及1:3的固液相比，实现了约99.98%的稀土元素和几乎所有锌的溶解。动力学数据符合化学控制模型。在传统条件下对总稀土元素和锌进行分离，以生产出具有市场价值形式的两种金属产品。然后这项工作转向通过用盐酸进行酸焙烧来单独分离铈，从而得到纯铈。
