无机离子交换剂Mg1.5Mn0.5Ti0.75O4对Li 的交换选择性实验

利用共沉淀，固相反应热结晶法，合成具有尖晶石型的复合金属氧化物Mg1.5Mn0.5Ti0.75O4。具有尖晶石型结构的物质，可以插入大量的替代离子并且改变自身锂和氧的化学计量数，与此同时，还保持了结构的稳定。这种特性能够使得它们被用于离子交换研究，用来满足提取锂的需求。通过检测该复合氧化物的饱和交换能力值，分配系数值等，从而确定出该物质具体特性。实验表明，经过酸化的Mg1.5Mn0.5Ti0.75O4，其Mg2 的抽出比率能够达到72%，Mn4 和Ti4 的溶解比率低于8.2%。实验分析得出，Li 能够从无机离子交换剂Mg1.5Mn0.5Ti0.75O4中抽出以及插入，主要是归因于离子交换机理。被酸化的样品对Li 有一个10.6mmol?g-1的离子交换能力，并且对Li 还具有记忆性的离子筛性能。

The Li exchange selectivity experiment of inorganic ion property Mg1.5Mn0.5Ti0.75O4

The combined metal oxide Mg1.5Mn0.5Ti0.75O4 which has a spinel type was synthesized by the method of co-precipitation/solid state reaction thermal crystallization. The substance with spinel type structure can insert a large number of alternative ions and change the stoichiometric number in lithium and oxygen, besides, it can keep the spinel type structure stability. This characteristic can be used for ion exchange study to meet requirement of extracting Lithium. The characteristics from combined metal oxide Mg1.5Mn0.5Ti0.75O4 can be measured by the value of saturation exchange capacity and distribution coefficient. The experiment shows that acidulated Mg1.5Mn0.5Ti0.75O4 caused Mg2 extractions more than 72%, while the dissolutions of Mn4 and Ti4 were less than 8.2%.Those experimental results showed that the process of Li extraction/insertion could realize through the ion-exchange mechanism. The acid treated sample has a 10.6mmol?g-1 ion exchange capacity for Li and a memorial Li ion-sieve property.