LiCoO_2在酸性焙烧环境中元素的赋存形式演变及分布规律研究  

Evolution and Distribution of Occurrence of Elements in Sulphating Roasting of LiCoO_2

作　　者：王大辉[1] 刘沛静 姜丽丽[1] 李辉辉[1] 王耀军[1] 寇生中[1] 

机构地区：[1]兰州理工大学有色金属先进加工与再利用省部共建国家重点实验室,甘肃兰州730050

出　　处：《新技术新工艺》2015年第1期61-64,共4页New Technology & New Process

基　　金：国家自然科学基金资助项目(51264027);国家重点基础研究发展规划973计划资助项目(2012CB722806);有色金属先进加工与再利用省部共建国家重点实验室基金资助项目(SKL12003)

摘　　要：研究发现钴酸锂(LiCoO2)与NaHSO4·H2O混合经硫酸化焙烧后转变为Li、Co和钠硫酸盐的混合物,然而该物质在酸性焙烧过程中Li和Co元素迁移的化学运动形式仍不为所知。采用TGDSC-MS、XRD、SEM和EDS对LiCoO2在酸性焙烧过程中的温度-质量变化、元素赋存形式的演变和元素的分布特征进行了研究。TG-DSC-MS分析结果表明,LiCoO2与NaHSO4·H2O出现3个明显的失重台阶,相对应DSC曲线出现3个吸热峰,先失去结晶水,再失去吸附水,最后释放出SO3气体,相对应的MS曲线上出现了H2O+(m/z18)和SO2+(m/z64);XRD分析结果表明,随着温度的升高,LiCoO2与NaHSO4·H2O的混合物料逐渐转变为LiNa(SO4)、CoSO4、NaCo(SO4)2和Na6Co(SO4)4;SEM分析结果表明,随着焙烧温度的升高,焙烧产物颗粒的尺寸逐渐减小,由块状物转化为鱼鳞状;EDS分析结果表明,Na、Co、S和O元素呈弥散状态均匀分布在焙烧产物中。The research found of LiCoO2 NaHSO4 · H2O mixed with sulfuric acid after roasting converted to lithium, cobalt, a mixture of sodium sulphate, but the substance is acidic lithium roasting process, the chemical form of exercise cobalt migration remains unclear. In this paper, TG-DSC-MS, XRD, SEM, EDS for LiCoO2 temperature acidic roasting process, the quality change, the evolution of the form element occurrence, distribution of the elements studied. TC-DSCMS results showed that LiCoO2 with NaHSO4 · H2O weight loss, there are three distinct steps, corresponding DSC curve, there are three endothermic peaks, the first loss of crystal water, and then lose adsorbed water, finally releasing sulfur tri- oxide gas, appeared H2O＋ （m/zl8） and SO2 ＋ （m/z64） on the corresponding MS curves. XRD results showed that the increase of temperature, the mixed material of LiCoO2 with NaHSO4 · H2O gradually changed LiNa （SO4）, COSO4, NaCo （SO4）2, N a6 Co （SO4）4. SEM results showed that with the calcination temperature, particle size calcined product decreased by lumps into a scaly. EDS results showed that Na, Co, S, O elements were dispersed uniformly distributed in the state of calcined product.

关 键 词：LICOO2 酸性焙烧 赋存形式 分布 

分 类 号：TE624.9[石油与天然气工程—油气加工工程]