化工进展 ›› 2022, Vol. 41 ›› Issue (S1): 637-642.DOI: 10.16085/j.issn.1000-6613.2022-0381

• 资源与环境化工 • 上一篇    下一篇

蒸发母液中锂的提取

李超(), 苗家兵, 王丽萍(), 崔永杰, 李依帆   

  1. 神华准能资源综合开发有限公司研发中心,内蒙古 鄂尔多斯 010300
  • 收稿日期:2022-03-13 修回日期:2022-04-26 出版日期:2022-10-20 发布日期:2022-11-10
  • 通讯作者: 王丽萍
  • 作者简介:李超(1983—),男,博士,高级工程师,研究方向为粉煤灰中有价元素提取及高附加值开发利用。E-mail: lichao_1122@163.com
  • 基金资助:
    国家科技部十二五科技计划支撑项目(2011BAA04B05)

Extraction of lithium from evaporation mother liquor

LI Chao(), MIAO Jiabing, WANG Liping(), CUI Yongjie, LI Yifan   

  1. Shenhua Zhunneng Resources Comprehensive Development Company Limited, Erdos 010300, Inner Mongolia, China
  • Received:2022-03-13 Revised:2022-04-26 Online:2022-10-20 Published:2022-11-10
  • Contact: WANG Liping

摘要:

在神华集团“一步酸溶法”粉煤灰生产氧化铝工艺的蒸发结晶工序中,锂及其他金属元素(K、Na、Mg、Ca等)长期富集,分离结晶氯化铝的母液中锂含量高达429mg/L。为了提取蒸发母液中的锂元素,研究人员采用喷雾焙烧技术和纯水浸出技术,成功实现了高酸度和饱和氯化铝溶液中铝、锂元素的有效分离。结果表明:在最佳的实验条件下,即热风温度为390℃、料浆浓度为200g/L、料浆流速为60g/L时,室温下料浆中锂离子提取率高达93.67%(质量分数)。XRD表征手段证实:当焙烧产物为无定形氧化铝,并含有钠明矾石物相时,焙烧产物中锂离子提取率较高,可能归因于钠明矾石中钠离子数量较多及钠离子的尺寸效应引起的。该方法有效解决了蒸发母液中的锂元素高效回收问题。

关键词: 蒸发母液, 氯化铝, 锂, 喷雾焙烧

Abstract:

In the process of producing alumina from fly ash by Shenhua Group self-developed "one step acid solution", lithium and other metal elements (K, Na, Mg, Ca) are enriched for a long time in the evaporative crystallization process, and the lithium content reached 429mg/L in the mother liquor after separated aluminum chloride crystalline. In order to extract lithium from evaporating mother liquor, the spray roasting technology and pure water leaching technology were selected to separate aluminum and lithium elements in high acidity and saturated aluminum chloride solution. The experimental results showed that the extraction rate of lithium reached 93.67% when the calcined temperature was 390℃, the concentration was 200g/L and the flow rate was 60g/L. Meanwhile, the results of XRD analysis confirmed that the major phase of alumina was amorphous and the existed sodium alunite phase was advantage to the extraction of lithium. This fact was attributed to the amount of sodium ions in sodium alunite as well as the effect of sodium ions size. This technology effectively solved the current situation of difficult extraction of lithium from evaporation mother liquor, which was of great significance.

Key words: evaporation mother liquor, aluminum chloride, lithium, spray roasting

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