重庆理工大学学报(自然科学) ›› 2023, Vol. 37 ›› Issue (4): 315-320.

• 能源动力环境 • 上一篇    下一篇

微波强化焙烧铬铁矿液相氧化浸出研究

周彦阔,全学军,封承飞   

  1. (重庆理工大学 化学化工学院,重庆 400054)
  • 出版日期:2023-05-06 发布日期:2023-05-06
  • 作者简介:周彦阔,男,硕士研究生,主要从事资源环境化工研究,Email:1242827553@qq.com;通信作者 全学军,男,博士, 教授,主要从事矿产资源清洁高效利用研究,Email:hengjunq@cqut.edu.cn。

Study on liquid phase oxidation leaching of chromite by microwave enhanced roasting

  • Online:2023-05-06 Published:2023-05-06

摘要: :为了缩短铬铁矿在高浓度氢氧化钠水溶液中高压氧化浸出时间,通过微波焙烧铬 铁矿矿石进行预处理。研究了微波焙烧对铬铁矿结构和浸出行为的影响,结果表明:在 800℃ 下微波焙烧铬铁矿后,铬铁矿表面出现大量裂纹,结构不再致密,大大降低了铬铁矿粒径。在温 度为 240℃、氧分压为 2.2MPa、碱矿比(质量比)为 4∶1、搅拌速度 700r/min、NaOH浓度为 60 wt.%的条件下,反应 120min,铬浸出率达 97.81%以上,表明采用微波焙烧铬铁矿进行压力氧 化浸出可大大提高铬的浸出效率。

关键词: 微波, 铬盐, 液相氧化法

Abstract: In order to shorten the high pressure oxidation leaching time of chromite in a high concentration of sodium hydroxide aqueous solution, this paper pretreats chromite ore by microwave roasting. The effect of microwave roasting on the structure and leaching of chromite is investigated. The results show that, after microwave roasting at 800 ℃, a large number of cracks appear on the surface of chromite, the structure is no longer dense, and the particle size of the chromite greatly reduces. Under the reaction conditions of a temperature of 240 ℃, O2 partial pressure of 2.2 MPa, NaOH-to-ore ratio of 4∶1, stirring speed of 700 r/min and NaOH concentration of 60 wt.%, the chromium leaching rate reaches over 97.81% after a reaction time of 120 min. The results show that using microwave roasted chromite for pressure oxidation leaching can greatly improve chromium leaching efficiency.

中图分类号: 

  • TF111.31