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本实验室前期所制备的Li4Mn5O12超细粉末在卤水体系中对Li+具有较大的吸附容量和良好的选择性。但由于超细粉体的流动性和渗透性差,无法直接应用于固定床,需对粉末吸附材料进行成型造粒,以便于实际应用。本论文采用聚氯乙烯为粘结剂,制备出粒径约为2.0~3.5 mm的球形PVC-Li4Mn5O12,经盐酸处理后得到球形PVC-MnO2离子筛。并通过扫描电镜(SEM)、X射线衍射仪(XRD)、静态和动态连续锂吸附实验研究了球形离子筛形貌和锂离子吸附性能。结果表明,球形离子筛对Li+的吸附容量高达5.28 mmol.g-1,在混合溶液中对Li+具有良好的选择性,这对于在盐湖卤水或海水提锂具有重要的实用意义。
The Li4Mn5O12 ultrafine powder prepared in our lab had a large adsorption capacity and good selectivity for Li + in brine system. However, due to the poor fluidity and permeability of ultra-fine powder, it can not be directly applied to the fixed bed. The powder adsorption material needs to be shaped and granulated for practical application. In this paper, PVC-Li4Mn5O12 spherical particles with a diameter of about 2.0 ~ 3.5 mm were prepared by using polyvinyl chloride as binder. After being treated with hydrochloric acid, spherical PVC-MnO2 ion sieve was obtained. The spherical ion sieve morphology and lithium ion adsorption performance were studied by scanning electron microscopy (SEM), X-ray diffraction (XRD), static and dynamic continuous lithium adsorption experiments. The results showed that the adsorption capacity of spherical ion sieve to Li + was as high as 5.28 mmol.g-1, which showed good selectivity for Li + in the mixed solution. This is of great practical significance for extracting lithium from salt lake brine or seawater.