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 ›› 2022, Vol. 54 ›› Issue (1): 77-82.doi: 10.19964/j.issn.1006-4990.2021-0163

• 环境·健康·安全 • 上一篇    下一篇

磷尾矿煅烧及酸浸过程动力学研究

周佳琦(),陈葵(),武斌,纪利俊,吴艳阳   

  1. 华东理工大学化工学院,上海 200237
  • 收稿日期:2021-03-18 出版日期:2022-01-10 发布日期:2022-03-14
  • 通讯作者: 陈葵
  • 作者简介:周佳琦(1995— ),女,硕士,主要研究方向为矿物分离;E-mail: jiaqizhou77@163.com.cn

Study on kinetics of phosphate tailings calcination and acid leaching process

ZHOU Jiaqi(),CHEN Kui(),WU Bin,JI Lijun,WU Yanyang   

  1. School of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China
  • Received:2021-03-18 Online:2022-01-10 Published:2022-03-14
  • Contact: CHEN Kui

摘要:

以湿法磷酸生产的经浮选后的废弃磷尾矿为原料,从其中分离回收钙镁,制备新型土壤调节剂糖醇钙镁,对磷尾矿进行了煅烧活化和酸浸动力学的实验研究。基于热重分析及钙镁酸解浸出率分析的研究结果表明,磷尾矿中白云石热分解过程为吸热反应,白云石热分解遵循二维相界面反应模型;钙、镁浸出反应表观活化能分别为13.157、23.023 kJ/mol;煅烧活化后的尾矿酸浸出速率受内扩散控制,获得白云石热分解及钙、镁浸出反应的动力学方程。

关键词: 磷尾矿, 煅烧, 浸出, 动力学

Abstract:

In order to effectively recover calcium and magnesium from phosphorus tailings after flotation in a phosphating plant,which can be used for the preparation of a new type of soil regulator,sugar alcohol chelated calcium-magnesium.The calcining and leaching kinetics experiment of phosphorus tailings was carried out.Based on thermogravimetric analysis and acid leaching rate of calcium and magnesium,the results showed that the thermal decomposition process of dolomite in phosphorus tailings was endothermic reaction,the thermal decomposition of dolomite followed the two-dimensional phase interface reaction model.The apparent activation energies of calcium and magnesium leaching reaction were 13.157 kJ/mol and 23.023 kJ/mol,the leaching rate was controlled by internal diffusion.And the kinetic equations of the thermal decomposition of dolomite and the leaching of calcium and magnesium were obtained.

Key words: phosphorus tailings, calcination, leaching, kinetics

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