锂渣在碱—水热环境下的溶出特性和反应产物  

Leaching Characteristics and Reaction Products of Lithium Slag in Alkali-Hydrothermal Environment

作　　者：曹瑞林 李保亮 贾子健 张舜泉[1,2] 张亚梅 CAO Ruilin;LI Baoliang;JIA Zijian;ZHANG Shunquan;ZHANG Yamei(School of Materials Science and Engineering,Southeast University,Nanjing 211189,China;Jiangsu Key Laboratory of Construction Materials,Southeast University,Nanjing 211189,China;Faculty of Architecture Civil Engineering,Huaiyin Institute of Technology,Huaian 223001,China)

机构地区：[1]东南大学材料科学与工程学院,江苏南京211189 [2]东南大学江苏省土木工程材料重点实验室,江苏南京211189 [3]淮阴工学院建筑工程学院,江苏淮安223001

出　　处：《建筑材料学报》2023年第2期163-171,共9页Journal of Building Materials

基　　金：国家自然科学基金资助项目(51972057);国家留学基金委资助项目(201906090165)。

摘　　要：以锂渣在碱溶液中的选择性溶出特性研究为出发点,计算锂渣中的Si、Al和Ca在不同碱-水热环境下的溶出率,分析锂渣在处理前后的物相组成、产物类型和微观形貌,探究碱-水热环境下锂渣的火山灰活性和溶出组分间的反应行为.结果表明:NaOH溶液浓度的提高有利于锂渣中锂辉石等成分溶解和Si、Al与Ca溶出;温度和溶出时间是碱激发锂渣反应进程的主要影响因素;在60℃以上的碱-水热环境下,锂渣的火山灰活性能够有效激发,锂渣中各可溶出元素的溶出率显著提高,并伴有大量反应产物生成.Based on the study of selective leaching process of lithium slag(LS) in alkaline solutions, the leaching ratios of Si, Al and Ca in LS under different alkali-hydrothermal conditions were calculated, the phase composition, hydration product types and micro-morphology of LS before and after alkali-hydrothermal treatment were analyzed.Meanwhile, the pozzolanic activity of LS and the reaction behaviors among dissolved components in LS were investigated. The results show that the increase of NaOH solution molarity is beneficial to the dissolution of spodumene and the leaching process of Si, Al and Ca. Temperature and leaching time are the main factors affecting the reaction process of alkali-activated lithium slag(AALS). In the alkali-hydrothermal environment above 60 ℃, the pozzolanic activity of LS can be effectively activated, and the leaching ratios of different elements in LS are obviously increased, accompanied by the formation of a large number of reaction products.

关 键 词：锂渣 溶出 碱-水热环境 反应产物 

分 类 号：TQ172.1[化学工程—水泥工业]