文献类型：期刊文献

中文题名：含锂氢氧化铝焙烧工艺中锂的变化行为

英文题名：The change behavior of lithium in the roasting process of lithium containing aluminum hydroxide

作者：庞朋魏 路坊海 柴洪云 何海军 魏壮强 舒娅

第一作者：庞朋魏

机构：[1]贵州大学材料与冶金学院,贵州贵阳550025;[2]贵州理工学院材料与能源工程学院,贵州贵阳550025;[3]国家电投集团贵州遵义产业发展有限公司,贵州遵义564300

第一机构：贵州大学材料与冶金学院,贵州贵阳550025

年份：2025

卷号：54

期号：4

起止页码：156-164

中文期刊名：中国有色冶金

外文期刊名：China Nonferrous Metallurgy

收录：;北大核心:【北大核心2023】；

基金：贵州省科技支撑计划“黔北富锂铝土矿中锂元素在碱法工艺中的化学行为及富集提取技术研究”(黔科合支撑[2023]一般243);贵州理工学院高层次人才科研启动经费项目(XJGC20181010);贵州省高层次创新型人才培养项目(GZSQCC2018002)。

语种：中文

中文关键词：含锂氢氧化铝;焙烧;锂杂质;变化行为;失重率;锂损失率

外文关键词：lithium aluminum hydroxide;roast;lithium impurity;change behavior;weight loss rate;lithium loss rate

摘要：富锂铝土矿生产氧化铝的工艺中,大部分锂在铝酸钠分解工序进入氢氧化铝,影响氧化铝产品质量及后续电解效率。本文系统性地对含锂氢氧化铝制品锻烧工艺中锂的变化行为进行研究,通过单因素试验考察焙烧工艺参数对氢氧化铝制品失重率及锂损失率的影响,并结合样品焙烧产物及中间产物的表征分析研究锂的变化行为,得到以下主要结论。单因素试验表明,焙烧温度、焙烧时间及升温速率均与氢氧化铝制品失重率和锂损失率呈正相关关系,在焙烧温度1150℃、焙烧时间30 min、升温速率25℃/min的优化条件下,氢氧化铝制品失重率为34.86%,锂损失率为14.82%,焙烧产物中锂以氧化物形式富集在氧化铝中。焙烧后的晶体表面出现了裂纹与孔隙,这主要是由于氢氧化铝制品中结晶水的析出以及氧化铝晶格的转变造成,增加焙烧时间或者延长焙烧温度均会造成晶粒表面裂纹的扩大及小凹陷的增加。
In the process of producing alumina from lithium-rich bauxite,most of the lithium enters aluminum hydroxide during the sodium aluminate decomposition process,which affects the quality of alumina products and the subsequent electrolytic efficiency.This paper systematically studies the change behavior of lithium in the calcination process of lithium-containing aluminum hydroxide products.Through single-factor experiments,the influence of calcination process parameters on the weight loss rate and lithium loss rate of aluminum hydroxide products is investigated.Combined with the characterization and analysis of the calcination products and intermediate products of the samples,the change behavior of lithium is studied,and the following main conclusions are obtained.Single-factor experiments show that the calcination temperature,calcination time and heating rate are all positively correlated with the weight loss rate and lithium loss rate of aluminium hydroxide products.Under the optimized conditions of calcination temperature of 1150℃,calcination time of 30 min and heating rate of 25℃/min,the weight loss rate of aluminium hydroxide products is 34.86%and the lithium loss rate is 14.82%.Lithium in the roasting products is enriched in the form of oxides in alumina.Cracks and pores appeared on the surface of the crystals after calcination,which was mainly caused by the precipitation of crystalline water in the aluminum hydroxide products and the transformation of the aluminum oxide lattice.Increasing the calcination time or extending the calcination temperature would both lead to the expansion of cracks on the grain surface and the increase of small depressions.