褐铁矿氢基矿相转化过程脱水行为动力学研究

金属矿山 ›› 2025, Vol. 54 ›› Issue (7): 60-65.

褐铁矿氢基矿相转化过程脱水行为动力学研究

郭晨阳^1,2,3 　高　鹏^1,2,3 　唐志东^1,2,3 　刘全坤^1,2,3 　韩跃新^1,2,3 　李艳军^1,2,3

1. 矿物加工科学与技术全国重点实验室,辽宁沈阳 110819;2. 东北大学资源与土木工程学院,辽宁沈阳 110819; 3. 难采选铁矿资源高效开发利用技术国家地方联合工程研究中心,辽宁沈阳 110819

出版日期:2025-07-15 发布日期:2025-08-12
通讯作者: 高　鹏(1982—),男,教授,博士,博士研究生导师。
作者简介:郭晨阳(2000—),男,硕士研究生。
基金资助:
“十四五”国家重点研发计划项目(编号:2021YFC2902403);国家自然科学基金项目(编号:52130406,U23A20603,52274253);中央高校基本科研业务费专项(编号:N25LJR002)。

Kinetic Study of Dehydration Behavior During Hydrogen-based Mineral Phase Transformation of Limonite

GUO Chenyang^1,2,3 　 GAO Peng ^1,2,3 　 TANG Zhidong ^1,2,3 　 LIU Quankun ^1,2,3 　 HAN Yuexin ^1,2,3 　 LI Yanjun ^1,2,3

1. State Key Laboratory of Mineral Processing,Shenyang 110819,China;2. School of Resources and Civil Engineering, Northeastern University,Shenyang 110819,China;3. National-local Joint Engineering Research Center of High-efficient Exploitation Technology for Refractory Iron Ore Resources,Shenyang 110819,China

Online:2025-07-15 Published:2025-08-12

摘要/Abstract

摘要： 氢基矿相转化技术是处理难选铁矿资源的有效手段,对我国难选铁矿石开发有重要意义。在矿相转化过程的加热阶段,褐铁矿会发生脱羟基行为,物相由褐铁矿转变为赤铁矿,对后续的还原与磨选过程影响较大,但其对应的机理研究较少。针对典型包子铺褐铁矿石,考察了加热温度、时间对其氢基矿相转化过程脱水行为的影响,并采用 TG-DSC 进行热失重分析及非等温动力学计算。试验结果表明:在加热温度 700 ℃ ,空气流通过 5 min 的条件下, 褐铁矿脱水失重率为 5. 22%。非等温动力学计算得出:褐铁矿脱水反应的表观活化能为 197. 62 kJ/ mol,最概然机理函数为 D5 扩散模型,积分形式为 [(1 - α) -1/ 3 - 1] 2 ,主要限制环节为气体扩散环节。研究明确了包子铺褐铁矿石在氢基矿相转化加热阶段脱水行为的关键参数及机理,为深入理解褐铁矿的氢基矿相转化过程提供了重要依据。

关键词: 褐铁矿　脱水反应　热重分析　非等温动力学　机理函数

Abstract: Hydrogen-based mineral phase transformation technology is an effective method of processing refractory iron ore resources and is of great significance to the development of refractory iron ores in China. During the heating stage of the mineral phase transformation process,limonite dehydroxylates and the physical phase transforms from limonite to hematite, which has a greater impact on the subsequent reduction and milling processes,but its corresponding mechanism is less studied. In this paper,the effect of heating temperature and time on the dehydration of a typical Baozipu limonite ore during its hydrogen-based mineral phase transformation is investigated,the heat loss analysis and non-isothermal kinetic calculations were also performed using TG-DSC. The test results show that the weight loss of limonite dehydration is 5. 22% under the condition of heating temperature of 700 ℃ and heating in the air gas flow for 5 min. Non-isothermal kinetic calculations show that the apparent activation energy of the dehydration reaction of limonite is 197. 62 kJ/ mol,the most probable mechanism function is the D5 diffusion model,and the integral form is [(1 - α) -1/ 3 - 1] 2 . The main limiting link is the gas diffusion link. The key parameters and mechanism of dehydration behavior of Baozipu limonite ore in the heating stage of hydrogen-based mineral phase transformation were clarified,which provided an important basis for further understanding the process of hydrogen-based mineral phase transformation of limonite.

Key words: limonite,dehydration reaction,thermogravimetric analysis,non-isothermal kinetics,function of mechanism

中图分类号:

P575. 6

郭晨阳, 　高　鹏, 　唐志东, 　刘全坤, 　韩跃新, 　李艳军, . 褐铁矿氢基矿相转化过程脱水行为动力学研究 [J]. 金属矿山, 2025, 54(7): 60-65.

GUO Chenyang , 　 GAO Peng , 　 TANG Zhidong , 　 LIU Quankun , 　 HAN Yuexin , 　 LI Yanjun , . Kinetic Study of Dehydration Behavior During Hydrogen-based Mineral Phase Transformation of Limonite [J]. Metal Mine, 2025, 54(7): 60-65.

扫码分享