低浓度铁尾矿酸浸出液选择性沉铁及制备LiFePO_4的研究  

Investigations on Precipitation Selectively of Iron From the Low Concentration Iron Tailings Lixivium and Preparation of LiFePO_4

作　　者：汪应玲 姜茂发[1,2] 刘承军[1,2] 罗绍华[3] 滕飞[1,3] 沈惠良 

机构地区：[1]东北大学冶金学院,辽宁沈阳110004 [2]东北大学多金属共生矿生态化冶金教育部重点实验室,辽宁沈阳110004 [3]东北大学秦皇岛分校资德与材料学,河北秦皇岛066004

出　　处：《陶瓷学报》2017年第5期730-734,共5页Journal of Ceramics

摘　　要：以低浓度铁尾矿酸浸出液为原料,通过控制溶液pH值进行选择性沉铁,制备出多元金属掺杂的FePO_4·xH_2O。并以其为前驱体,通过固相-碳热还原法成功地制备出LiFePO_4。利用化学滴定法、SEM、XRD和充放电测试等方法对样品进行了分析。结果表明:所制备的LiFePO_4结晶良好,为单一的橄榄石结构。在0.1C、1C、2C和5C倍率下首次放电比容量分别为144.9mAh·g^(-1)、132.07mAh·g^(-1)、122.6mAh·g^(-1)和115.6mAh·g^(-1)。这种以铁尾矿为主要原料制备锂离子电池正极材料LiFePO_4的方法,为铁尾矿的综合利用提供了一条新途径。The FePO_4·x H_2O precursor with mix-doped composite was selectively preciptated prepared from the low concentration iron tailings lixivium by adjusting p H of the solutions. The Ti-Al doped LiFePO_4was successfully synthesized using the FePO_4·x H_2O as the starting material, by solid-state carbon thermal reaction. The samples were analyzed by chemical titration、XRD、SEM and chargedischarge tests, etc. The results indicated that the LiFePO_4was single olivine structure. The sample showed the first discharge capacity of 144.9 m Ah·g-1、132.07 m Ah·g^（-1）、122.6 m Ah·g^（-1） and 115.6 m Ah·g^（-1） at 0.1 C、1 C、2 C and 5 C rates,respectively. Also, this method of preparing cathode material LiFePO_4 by using iron tailings as raw material are willing to develop a new way for comprehensive utilization of iron tailings.

关 键 词：铁尾矿 选择性沉铁 磷酸铁锂 

分 类 号：TQ174.75[化学工程—陶瓷工业]