无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2024, Vol. 56 ›› Issue (7): 118-125.doi: 10.19964/j.issn.1006-4990.2023-0556

• 环境·健康·安全 • 上一篇    下一篇

铬铁矿无钙焙烧渣中铬的绿色提取

蹇成宗(), 蒋子文, 全学军(), 李纲()   

  1. 重庆理工大学化学化工学院,重庆 400054
  • 收稿日期:2023-11-22 出版日期:2024-07-10 发布日期:2024-08-01
  • 通讯作者: 全学军(1963— ),男,博士,教授,主要从事资源环境化工研究;E-mail:hengjunq@cqut.edu.cn
    李纲(1981— ),男,博士,副教授,主要从事资源环境化工研究;E-mail:47922138@163.com
  • 作者简介:蹇成宗(1998— ),男,硕士,研究方向为铬盐清洁生产研究;E-mail:chengzjian@163.com
  • 基金资助:
    重庆英才计划项目(CQYC20210309538)

Eco⁃friendly extraction of chromium from calcium⁃free roasting slag of chromite ore

JIAN Chengzong(), JIANG Ziwen, QUAN Xuejun(), LI Gang()   

  1. School of Chemistry and Chemical Engineering,Chongqing University of Technology,Chongqing 400054,China
  • Received:2023-11-22 Published:2024-07-10 Online:2024-08-01

摘要:

铬铁矿无钙钠化氧化焙烧—水浸提取是目前铬盐生产的主流工艺,提取剩余的铬渣中仍然存在一定量未反应完全的铬及新生成的含铬矿物。开展从铬渣中深度提取铬的绿色工艺研究,对于资源综合利用具有十分重要的意义。以铬铁矿无钙焙烧铬渣为原料,提出了一种铬渣烧碱焙烧—水浸提铬绿色工艺。研究结果表明:无钙焙烧铬渣通过烧碱焙烧—水浸提铬绿色工艺,不仅降低焙烧反应温度,还可以消除传统焙烧过程中产生的CO2,实现铬的绿色提取;铬的提取率达到92%以上,经过焙烧—浸出产生的铬渣中Cr(Ⅵ)含量降低至3.85 mg/L;铬的氧化焙烧动力学由内扩散控制,频率因子A为0.39 s-1,反应表观活化能Ea为15.22 kJ/mol。该研究结果可为无钙焙烧铬渣的深度绿色提铬及铬渣资源化处理提供新的技术思路。

关键词: 铬铁矿, 提取铬, 铬渣, 绿色提取

Abstract:

Calcium⁃free oxidative roasting of chromite ore and water leaching is the mainstream process of chromium salt production,but there is still a certain amount of residual chromite ore and some newly generated chromium⁃containing minerals in the chromite ore processing residue(COPR).Research on the eco⁃friendly process of deep extraction of chromium from the COPR will be very important to the comprehensive utilization of resources.An eco⁃friendly extraction process of chromium salt from the COPR was proposed.The research results showed that the chromium could be extracted by an eco⁃friendly alkali roasting⁃water quenching process,and this new process could not only reduce the roasting reaction temperature,but also eliminate CO2 produced in traditional roasting process.The extraction rate of chromium reached more than 92%,and the Cr(Ⅵ) in the leached chromium slag was reduced to 3.85 mg/L.The kinetics of the oxidative roasting of chromium was controlled by internal diffusion with a frequency factor A of 0.39 s-1 and an apparent activation energy of the reaction Ea of 15.22 kJ/mol.The obtained results could provide new technical ideas for deep extraction of chromium from COPR using an eco⁃friendly process.

Key words: chromite ore, extraction of chromium, chromite ore processing residue, eco?friendly extraction

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