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 (5): 18-25.doi: 10.19964/j.issn.1006-4990.2024-0264

• 镁资源高值化利用 • 上一篇    下一篇

煅白水化改性对其炼镁实验的影响及机理研究

李直1(), 黄小锐1,2(), 姜震宇1, 李雪1, 赵坤1, 许光文1,2()   

  1. 1.沈阳化工大学特色资源化工与材料教育部重点实验室,辽宁 沈阳 110142
    2.辽宁科技大学化学工程学院,辽宁 鞍山 114051
  • 收稿日期:2024-05-10 出版日期:2025-05-10 发布日期:2025-06-05
  • 通讯作者: 黄小锐(1994— ),男,讲师,主要研究方向为菱镁矿综合利用及镁绿色冶炼;E-mail:huangxiaorui@syuct.edu.cn
    许光文(1966— ),男,博士,教授,主要研究方向为工程热化学领域;E-mail:gwxu@ipe.ac.cn
  • 作者简介:李直(1999— ),男,硕士,主要研究方向为硅热法炼镁工艺研究;E-mail:3488675843@qq.com
  • 基金资助:
    国家重点研发计划项目(2020YFC1909304);辽宁省教育厅基础研究项目(JYTQN 2023369)

Study on effect and mechanism of hydration of dolime on its magnesium extraction experiment

LI Zhi1(), HUANG Xiaorui1,2(), JIANG Zhenyu1, LI Xue1, ZHAO Kun1, XU Guangwen1,2()   

  1. 1. Key Laboratory of Resources Chemicals and Materials of Ministry of Education,Shenyang University of Chemical Technology,Shenyang 110142,China
    2. School of Chemical Engineering,University of Science and Technology Liaoning,Anshan 114051,China
  • Received:2024-05-10 Published:2025-05-10 Online:2025-06-05

摘要:

中国是世界上最大的金属镁生产国和出口国,但较低的镁还原率导致炼镁能耗高、生产效率低、废镁渣多且氧化镁含量高,严重制约了中国金属镁产业的绿色、健康发展。为提高炼镁还原率,对炼镁原料煅白进行了改性处理。首先,将白云石煅烧得到的煅白通过水化-再煅烧工艺制备水化改性煅白。随后,分别以煅白和水化改性煅白为原料,与硅铁、萤石混合并压制成还原球团,在高温、真空条件下进行炼镁实验。通过热重分析(TG)、X射线衍射(XRD)、比表面积分析(BET)、粒度分析仪及扫描电镜-能谱分析(SEM-EDS)对水化改性前后煅白及炼镁实验还原渣的物相性质、结构、组分和形貌进行了系统表征。实验结果表明,水化改性后的煅白粒度显著减小,颗粒尺寸从60 μm降至1 μm,其微观形貌呈现疏松多孔结构,孔隙发达且孔径增大,比表面积从8.41 m2/g增加至23.23 m2/g。煅白经改性处理后,炼镁实验的镁还原率显著提高,在还原时间为1.0 h的条件下,以煅白为原料的炼镁实验镁还原率为82%,而以水化改性煅白为原料的炼镁实验镁还原率提升至94%。这表明水化改性处理有效改善了煅白的物理化学性质,从而显著提升了炼镁效率。

关键词: 煅白, 水化, 皮江法, 炼镁

Abstract:

China is the world′s leading producer and exporter of metallic magnesium.However,the low reduction rate of magnesium oxide results in high energy consumption,inefficient production,and a significant amount of waste magnesium slag with a high content of magnesium oxide.This hinders the green and healthy development of the metallic magnesium industry.To enhance reduction rate of magnesium oxide in magnesium smelting,modified treatment was conductedon the dolime.The dolime derived from dolomite was firstly hydrated and subsequently subjected to further calcination in order to produce hydrated modified dolime.Then the dolime and the hydrated modified dolime were mixed with ferrosilicon and fluorite,pressed into reduced pellets,and subjected to the magnesium extraction experiment under high temperature and vacuum.The properties,structure,composition and morphology of dolime before and after hydration modification and the residual slag and Mg after experiments were characterized by TG,XRD,BET,particle size analyzer and SEM-EDS.The results demonstrated a significant reduction in the particle size of hydrated modified dolime,with the particle size decreasing from 60 μm to 1 μm.The microstructure exhibited a loose and porous nature,characterized by well⁃developed pores and increased pore size,and the specific surface area was increased from 8.41 m2/g to 23.23 m2/g.Furthermore,the modification treatment led to an increase in the reduction rate of magnesium oxide,as evidenced by a reduction rate of 82% for magnesium oxide in experiments using dolime as raw material under a reduction time of 1.0 h,compared to a reduction rate of 94% for magnesium oxide in experiments using hydrated modified dolime as raw material.It suggested that the hydration modification treatment effectively enhanced the physicochemical properties of the dolime,thereby significantly boosting the magnesium smelting efficiency.

Key words: calcined white, hydration, pidgeon, magnesium smelt

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