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 ›› 2025, Vol. 57 ›› Issue (1): 90-96.doi: 10.19964/j.issn.1006-4990.2024-0070

• 环境·健康·安全 • 上一篇    下一篇

铬铁矿无钙焙烧渣中铬的深度提取研究

曾一钧(), 蒋子文, 蹇成宗, 全学军()   

  1. 重庆理工大学化学化工学院,重庆 400054
  • 收稿日期:2024-02-02 出版日期:2025-01-10 发布日期:2025-01-24
  • 通讯作者: 全学军(1963— ),男,博士,教授,主要研究方向为资源环境化工;E-mail:hengjunq@cqut.edu.cn
  • 作者简介:曾一钧(1998— ),男,硕士研究生,主要研究方向为资源环境化工;E-mail:zengyijun1109@163.com
  • 基金资助:
    重庆英才计划项目(CQYC20210309538)

Study on deep extraction of chromium from calcium-free roasting slag of chromite ore

ZENG Yijun(), JIANG Ziwen, JIAN Chengzong, QUAN Xuejun()   

  1. School of Chemistry and Chemical Engineering,Chongqing University of Technology,Chongqing 400054,China
  • Received:2024-02-02 Published:2025-01-10 Online:2025-01-24

摘要:

铬铁矿氧化焙烧—水浸提铬残渣中仍然存在较大量未反应的铬元素,研究其深度提取对于实现铬铁矿资源的全资源化利用具有重要意义。利用NaOH-NaCl体系对铬铁矿无钙焙烧渣深度提铬,探究了氧化焙烧过程工艺参数对铬提取率的影响及焙烧过程动力学。结果表明,NaCl用量、焙烧时间、焙烧温度等参数都会影响到铬的提取率。在氢氧化钠添加量为40%(质量分数)、氯化钠添加量为10%(质量分数)、铬渣粒径为100目、焙烧温度为900 ℃、焙烧时间为150 min的优化条件下,铬的提取率达到98%。低熔点NaOH的加入促进了传质,NaCl分解产生的Cl2作为催化剂和氧化剂,为从铬渣中高效回收铬提供了新思路。铬渣在NaOH-NaCl氧化焙烧体系中由内扩散控制,频率因子为0.026 min-1,反应表观活化能约为25.00 kJ/mol。并对经焙烧提铬后的铬渣进行了表征分析,结果表明焙烧过程中铬渣的结构遭到破坏,铬从尖晶石结构中释放出来,从而实现铬的提取。

关键词: NaOH-NaCl体系, 铬铁矿无钙焙烧渣, 氧化焙烧, 焙烧过程动力学, 回收铬

Abstract:

A large amount of unreacted chromium still exists in the chromite oxidation roasting-water leaching chromium extraction residue,and the study of its in-depth extraction is of great significance for realizing the full resource utilization of chromite resources.In this study,the NaOH-NaCl system was proposed for the deep extraction of chromium from the calcium-free roasting residue of chromite,and the effects of process parameters on the extraction rate of chromium in the oxidative roasting process and the kinetics of the roasting process were investigated.The results showed that parameters such as NaCl dosage,roasting time and roasting temperature affected the extraction rate of chromium.Under the optimized conditions of sodium hydroxide of 40%, sodium chloride of 10%,chromium slag size of 100 mesh,roasting temperature of 900 ℃ and roasting time of 150 min,the chromium extraction rate reached 98%.The addition of NaOH with a low melting point promoted mass transfer,and Cl2 generated from the decomposition of NaCl acted as a catalyst and oxidizer,providing a new idea for the efficient recovery of chromium from chromium slag.The oxidative roasting system of chromium slag in NaOH-NaCl was controlled by internal diffusion with the frequency factor A=0.026 min-1,and the apparent activation energy of the reaction E was about 25.00 kJ/mol.The chromium slag after chromium extraction by roasting was also characterized,and the results showed that the structure of chromium slag was destroyed during roasting,and chromium was released in the spinel structure to achieve chromium extraction.

Key words: NaOH-NaCl system, chromite calcium-free roasting slag, oxidative roasting, kinetics of roasting process, chromium recovery

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