摘要
随着新能源产业的快速发展,氢氧化锂作为锂离子电池的关键原料,其市场需求持续增长,因此,优化氢氧化锂生产工艺成为当前研究热点。碳酸锂石灰苛化制备氢氧化锂工艺具有流程简单、高效的特点,能够将低品位碳酸锂转化为高附加值锂产品。然而,在苛化反应过程中会生成夹带0.5%~1.2%锂的碳酸钙渣,导致锂资源损失。为提高锂的回收率,需对碳酸钙渣进行水洗以降低其锂含量。基于碳酸锂-石灰苛化工艺,本文通过试验探究了多级水洗对碳酸钙渣的提纯效果。试验结果表明,经二次洗涤后,所得碳酸钙渣的主成分含量达98.21%,锂残留量降至0.09%,显著提高了锂的回收效率。
With the rapid development of the new energy industry,lithium hydroxide,as a key raw material for lithium-ion batteries,has seen a continuous growth in market demand.Therefore,optimizing the production process of lithium hydroxide has become a current research hotspot.The process of preparing lithium hydroxide via the lithium carbonate-lime causticization features simplicity and high efficiency,and it can convert low-grade lithium carbonate into high-value-added lithium products.However,during the causticization reaction,calcium carbonate slag with 0.5%~1.2%lithium is generated,leading to the loss of lithium resources.To improve the lithium recovery rate,it is necessary to wash the calcium carbonate slag with water to reduce its lithium content.Based on the lithium carbonate-lime causticization process,this study explored the purification effect of multi-stage water washing on calcium carbonate slag through experiments.The results show that after two-stage washing,the main component content of the obtained calcium carbonate slag reaches 98.21%,and the residual lithium content is reduced to 0.09%,which significantly improves the lithium recovery efficiency.
作者
桑园
张凯
郑雅琪
SANG Yuan;ZHANG Kai;ZHENG Yaqi(China ENFI Engineering Corporation,Beijing 100038,China;Sichuan Nengtou De'a Lithium Co.,Ltd.,Mianzhu 618200,China)
出处
《绿色矿冶》
2025年第6期72-76,92,共6页
Sustainable Mining and Metallurgy
关键词
氢氧化锂
碳酸锂苛化
碳酸钙渣
水洗除杂
lithium hydroxide
lithium carbonate causticization
calcium carbonate residue
water washing for impurity removal
