CIESC Journal ›› 2021, Vol. 72 ›› Issue (4): 2086-2093.DOI: 10.11949/0438-1157.20200993

• Catalysis, kinetics and reactors • Previous Articles     Next Articles

Study on the leaching and kinetics of strontium celestite residue with barium chloride

HE Yu1,2(),LIU Zuohua1,2(),LUAN Jinhua3,CUI Zhiwei3,ZHANG Xiong3,MAO Lingling3,TAO Changyuan1,2   

  1. 1.School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China
    2.State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
    3.Chongqing Institute of Geology and Mineral Resources, Chongqing 400044, China
  • Received:2020-07-23 Revised:2020-09-27 Online:2021-04-05 Published:2021-04-05
  • Contact: LIU Zuohua

天青石锶废渣氯化钡浸出及其动力学研究

何宇1,2(),刘作华1,2(),栾进华3,崔志伟3,张雄3,毛玲玲3,陶长元1,2   

  1. 1.重庆大学化学化工学院,重庆 400044
    2.煤矿灾害动力学与控制国家重点实验室(重庆大学),重庆 400044
    3.重庆地质矿产研究院,重庆 400044
  • 通讯作者: 刘作华
  • 作者简介:何宇(1994—),男,硕士研究生,228729305@qq.com
  • 基金资助:
    重庆市规划和自然资源局科技项目(KJ-2019037);煤炭灾害动力学与控制国家重点实验室自主研究课题重点项目(2011DA105287-zd201902)

Abstract:

The strontium waste residue left after the production of strontium carbonate from celestite is a secondary resource because it contains a large amount of strontium resources. At present, strontium celestite waste residue is mainly used to prepare SrCl2 through a two-step method of carbonate conversion and hydrochloric acid leaching, and the preparation process is complicated. In the experiment, BaCl2 was used as the leaching agent to extract SrSO4 from the strontium lapis lazuli waste residue after acid pretreatment, and SrCl2 was obtained by one-step leaching. The effects of leaching time, leaching temperature, BaCl2/SrSO4 molar ratio, and liquid-solid ratio on the leaching rate of strontium were investigated respectively. The results showed that when the leaching time was 120 min, the leaching temperature was 90℃, the molar ratio of BaCl2/SrSO4 was 2.0, and the initial liquid-to-solid ratio was 10 ml/g, the strontium leaching rate reached 68.79%. The leaching process conforms to the unreacted nuclear shrinkage model and is mainly controlled by the diffusion of the BaSO4 product layer, and its apparent activation energy is 38.75 kJ/mol. Ba2+ partially or completely replaces the strontium in SrSO4, so that the strontium in the strontium waste residue is leached in the form of SrCl2.

Key words: strontium waste residue, barium chloride, leaching, dynamics, replace

摘要:

天青石生产碳酸锶后剩下的锶废渣,因含有大量的锶资源,属于一种二次资源。目前天青石锶废渣主要通过碳酸盐转化-盐酸浸出两步法来制备SrCl2,制备过程复杂。实验以BaCl2为浸出剂,浸出酸预处理后的天青石锶废渣中的SrSO4,通过一步浸出得到SrCl2。分别考察了浸出时间、浸出温度、BaCl2/SrSO4摩尔比、液固比对锶浸出率的影响。结果表明:浸出时间120 min,浸出温度90℃,BaCl2/SrSO4摩尔比2.0,初始液固比10 ml/g时的锶浸出率达到了68.79%。该浸出过程符合未反应核缩模型,且主要受BaSO4产物层扩散控制,其表观活化能为38.75 kJ/mol。Ba2+部分或全部取代SrSO4中的锶,使得锶废渣中的锶以SrCl2的形式被浸出。

关键词: 锶废渣, 氯化钡, 浸出, 动力学, 取代

CLC Number: