CAJ | 학술논문

以高温固相法合成的尖晶石型LiMn2O4前驱体为研究对象,通过对离子筛和离子筛吸附产物的化学分析、X射线衍射图谱分析、热重分析、红外分析和滤液中锂交换量与锰损失量分析,提出并验证了离子筛和吸附产物化学组成式可由LixMn2O4（0≤x≤1）表达,其结构依然保持尖晶石结构,阐明了以盐酸为洗脱剂离子筛提锂过程的氧化还原反应机理,给出了完善的洗脱过程与吸附过程反应式。实验结果表明,洗脱和吸附过程不彻底是导致离子筛吸附量与饱和吸附量相差较大的原因,离子筛中Mn3＋歧化是离子筛发生溶损的主因;提出了关于尖晶石型离子筛提锂深入研究关键问题的建议。
이고온고상법합성적첨정석형LiMn2O4전구체위연구대상,통과대리자사화리자사흡부산물적화학분석、X사선연사도보분석、열중분석、홍외분석화려액중리교환량여맹손실량분석,제출병험증료리자사화흡부산물화학조성식가유LixMn2O4（0≤x≤1）표체,기결구의연보지첨정석결구,천명료이염산위세탈제리자사제리과정적양화환원반응궤리,급출료완선적세탈과정여흡부과정반응식。실험결과표명,세탈화흡부과정불철저시도치리자사흡부량여포화흡부량상차교대적원인,리자사중Mn3＋기화시리자사발생용손적주인;제출료관우첨정석형리자사제리심입연구관건문제적건의。
LiMn2O4 precursor was prepared by high temperature solid-state method. Ghemlcal analysis, A-ray powder diffraction analysis, thermal analysis and infrared analysis of adsorbed and eluted products were characterized, and the corresponding relationships between lithium exchange capacity and manganese dissolved loss were investigated. The chemical compositions of adsorbed and eluted products may be expressed by Lix Mn2O4 (0≤x≤1), which was proposed and verified for the first time, and their structures remain spinel-type. Redox reaction mechanisms of the adsorption and elution process were described in detail when hydrochloric acid was eluent, and more prefect chemical reaction equations were given. The experimental results showed that elution and adsorption process were not thoroughly and completely result in adsorption capacity of ionic sieve was low compared with saturated adsorption, and the disproportionation of Mn^3+ leaded to manganese dissolved loss. Furthermore the guiding suggestions for the further researches on extracting lithium with ionic sieve were proposed.