摘要
以硫酸钠-硫酸钾混合硫酸盐为焙烧助剂,采用焙烧—水浸法提取中低品位锂瓷石(Li_(2)O含量1.86%)中的锂,探讨了硫酸盐种类、矿料比、焙烧温度、焙烧时间等因素对锂浸出率的影响,研究了焙烧过程的热力学,物料的微观形貌和物相变化。结果表明,与单个硫酸盐焙烧法相比,混合硫酸盐法可以明显提高锂离子浸出率,在850℃焙烧1h,锂瓷石∶硫酸钾∶硫酸钠配比为1∶0.35∶0.15时,锂浸出率可达到95.2%。硫酸盐焙烧过程中,先出现钾长石(KAlSi_(3)O_(8)),之后钾长石转变成白榴石(KAlSi_(2)O_(6))及石英(SiO_(2))。
Using sodium sulfate-potassium sulfate mixed sulfate as the roasting assistant,the lithium in mediumlow grade lithium porcelain stone(Li_(2)O content 1.86%)was extracted via roasting-water leaching method.The effects of sulfate type,ore material ratio,calcination temperature,calcination time and other factors on the leaching rate of lithium were investigated.The thermodynamic,microscopic morphology and phase changes of the calcination process were studied.The results show that compared with the single sulfate roasting method,the mixed sulfate roasting method can significantly improve the lithium leaching rate,and the lithium leaching rate can reach 95.2%when the calcination temperature is 850℃for 1hand the ratio of lithium porcelain stone to potassium sulfate to sodium sulfate is 1∶0.35∶0.15.In the process of sulfate roasting,potassium feldspar(KAlSi_(3)O_(8))appears first,and then potassium feldspar is transformed into garnet(KAlSi_(2)O_(6))and quartz(SiO_(2)).
作者
王亮
高尚
黄英枫
肖防贵
刘够生
WANG Liang;GAO Shang;HUANG Yingfeng;XIAO Fanggui;LIU Gousheng(College of Chemistry and Chemical Engineering,Nanchang University,Nanchang 330031,China;Jiangxi Kunlong New Materials Co.,Ltd.,Yichun 336000,China;Jiangxi Science and Technology Normal University,Logistics Management Service,330013,China)
出处
《有色金属工程》
CAS
北大核心
2023年第5期46-52,共7页
Nonferrous Metals Engineering
关键词
中低品位锂瓷石
硫酸盐焙烧法
提锂
相转变
medium and low grade lithium porcelain stone
sulfate roasting method
extracting lithium
phase transition
作者简介
王亮(1997-),男,硕士研究生,研究方向为湿法冶金;通信作者:刘够生(1966-),男,教授,主要从事分离工程及化工过程开发。
