锰源对合成锂离子筛及吸附性能影响

Effects of Manganese Source on Synthesis and Adsorption Properties of Lithium Ion Sieve

锰系锂离子筛适用于我国高镁锂比的盐湖提锂,针对MnSO_(4),MnOOH,Mn_(3)O_(4)三种不同锰源合成MnO_(2)·0.5H_(2)O锂离子筛,分析锰源对锂离子筛吸附性能的影响.采用XRD,SEM,BET,AAS技术手段对样品进行表征分析.实验结果表明,三种锰源均可合成较纯的Li 1.6 Mn 1.6 O_(4)离子筛前驱体,酸洗脱锂后三种锂离子筛的BET比表面积相比先驱体均发生了大幅增加,增量分别为546.6%,129.9%,142.2%.其中以MnSO_(4)合成的离子筛比表面积最大,Mn_(3)O_(4)合成的离子筛成特殊棒状形貌.吸附结果表明,MnSO_(4)源合成的离子筛锂吸附性量最高,在质量浓度仅20 mg/L的低锂溶液中,提锂量为19 mg/g.

Manganese lithium ion sieve is suitable for extracting lithium from salt lakes with high magnesium lithium ratio in China.MnO_(2)·0.5H_(2)O lithium ion sieve were synthesized from three different manganese sources:MnSO_(4),MnOOH and Mn_(3)O_(4).The products were characterized by X-ray diffraction(XRD),scanning electron microscope(SEM),special surface area analysis(the BET method),and atomic absorption spectrometer(AAS).The experimental results show that the three manganese sources can synthesize relatively pure Li 1.6 Mn 1.6 O_(4)ion sieve precursors.After acid pickling,the BET specific surface areas of the three lithium ion sieves have increased significantly compared with the precursors,with increments of 546.6%,129.9%and 142.2%respectively.Among them,the ion sieve synthesized by MnSO_(4)has the largest specific surface area,and the ion sieve synthesized by Mn_(3)O_(4)has a special rod shape.The adsorption results showed that the lithium adsorption capacity of the ion sieve synthesized by MnSO_(4)source was the highest.In the low lithium solution with a concentration of only 20 mg/L,the lithium extraction capacity was 19 mg/g.