摘要
以酒石酸为浸出剂,考察了不同浸出条件对赤泥中钠、钛浸出率的影响,通过正交试验对工艺参数进行优化,并结合浸出动力学和浸渣性质分析其浸出机制。浸出试验和正交试验结果表明:酒石酸浓度1.00 mol/L、浸出温度90℃、液固比8 mL/g、浸出时间60 min条件下,赤泥中钠和钛浸出率分别为93.50%和76.66%。酒石酸浸出前后赤泥的XRD分析结果表明,浸出液中的钠主要来自钙霞石和拜耳法工艺中的氢氧化钠,钛主要来自钙钛矿和拜耳法工艺中溶解并重新沉淀在赤泥表面的次生钛。浸出动力学分析结果表明,赤泥脱碱和钛浸出符合未反应收缩核模型,且脱碱和钛浸出过程主要受界面化学反应控制。
With tartaric acid as a leaching agent,an experiment was conducted to investigate the effects of different leaching conditions on the leaching rates of sodium and titanium from red mud.The process parameters were optimized by orthogonal experiments,and the leaching mechanism was then analyzed in combination with the study of leaching kinetics and the properties of leaching residues.It can be seen from the leaching test and orthogonal experiment that with tartaric acid at a concentration of 1.00 mol/L,leaching temperature of 90℃,liquid-solid ratio of 8 mL/g,and leaching time of 60 min,the leaching rates of sodium and titanium from red mud can reach 93.50%and 76.66%,respectively.XRD analysis of red mud before and after tartaric acid leaching shows that the sodium in the leaching solution mainly comes from cancrinite and sodium hydroxide in the Bayer process,while the titanium mainly comes from perovskite and secondary titanium that dissolves and re-precipitates on the surface of red mud during the Bayer process.The leaching kinetics analysis shows that both alkali removal and titanium leaching from red mud conform to an unreacted shrinking core model,and the processes of alkali removal and titanium leaching are mainly controlled by interfacial chemical reactions.
作者
刘文宝
丁睿
李维超
刘文刚
沈岩柏
张覃
LIU Wenbao;DING Rui;LI Weichao;LIU Wengang;SHEN Yanbai;ZHANG Qin(School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,Liaoning,China;Guizhou Academy of Sciences,Guiyang 550001,Guizhou,China)
出处
《矿冶工程》
北大核心
2025年第4期141-146,共6页
Mining and Metallurgical Engineering
基金
贵州省省级科技计划项目(黔科合支撑[2023]一般142)
中国博士后科学基金(2022M720927)。
关键词
赤泥
拜尔法
脱碱
钛
酒石酸
浸出动力学
有机酸浸出
red mud
Bayer process
alkali removal
titanium
tartaric acid
leaching kinetics
organic acid leaching
作者简介
刘文宝(1988-),男,山东临沂人,博士,副教授,博士研究生导师,主要从事矿物分选及固体废弃物综合回收利用研究。E⁃mail:liuwenbao@mail.neu.edu.cn;通信作者:张覃(1967-),女,贵州毕节人,博士,教授,博士研究生导师,主要从事矿产资源综合利用研究。E⁃mail:zq6736@163.com。
