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 (10): 64-74.doi: 10.19964/j.issn.1006-4990.2024-0683

• 研究与开发 • 上一篇    下一篇

MgCl2-xNa2yB2O3-H2O体系三方硼镁石结晶工艺及动力学研究

胡真榕1,2,3(), 张曼曼2,3, 石成龙1(), 彭姣玉2,3(), 周彦男2,3, 董亚萍2,3, 李武2,4   

  1. 1.青海民族大学化学与材料科学学院,青海 西宁 810007
    2.中国科学院青海盐湖研究所,盐湖资源绿色高值利用重点;实验室,青海省盐湖资源综合利用工程技术中心,青海 西宁 810008
    3.青海盐湖资源综合利用技术研究开发中心,青海 西宁 810008
    4.青海省盐湖资源化学重点实验室,青海 西宁 810008
  • 收稿日期:2024-12-17 出版日期:2025-10-10 发布日期:2025-07-17
  • 通讯作者: 石成龙(1989— ),男,博士,教授,研究方向为材料与化工;E-mail:qhmuscl@126.com
    彭姣玉(1985— ),女,博士,副研究员,研究方向为盐卤硼酸盐化学与硼同位素分离;E-mail:pengjy@isl.ac.cn
  • 作者简介:胡真榕(1998— ),女,硕士研究生,研究方向为材料工程;E-mail:huzr2023@163.com
  • 基金资助:
    青海省自然科学基金团队项目(2024-ZJ-901);青海民族大学研究生精品示范课程建设项目(JK-2024-09);青海省中青年科技人才托举工程项目(2023QHSKXRCTJ46)

Study on crystallization process and kinetic of macallisterite in concentrated MgCl2-xNa2yB2O3-H2O solution

HU Zhenrong1,2,3(), ZHANG Manman2,3, SHI Chenglong1(), PENG Jiaoyu2,3(), ZHOU Yannan2,3, DONG Yaping2,3, LI Wu2,4   

  1. 1. School of Chemistry and Materials Science,Qinghai Minzu University,Xining 810007,China
    2. Key Laboratory of Green and High-end Utilization of Salt Lake Resources,Qinghai Engineering and Technology Research Center of Comprehensive Utilization of Salt Lake Resources,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining 810008,China
    3. Qinghai Engineering and Technology Research Center of Comprehensive Utilization of Salt Lake Resources,Xining 810008,China
    4. Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province,Xining 810008,China
  • Received:2024-12-17 Published:2025-10-10 Online:2025-07-17

摘要:

硼酸镁是无碱玻璃纤维和陶瓷生产中重要的含硼原材料。针对玻璃用水合硼酸镁(如三方硼镁石)实验室合成中存在反应速率慢、产率低、成本高等问题,开展了MgCl2-xNa2yB2O3-H2O浓盐溶液中三方硼镁石的结晶工艺及动力学研究。以MgCl2·6H2O、NaOH和H3BO3为原料,利用响应曲面法(RSM)设计优化了三方硼镁石的结晶工艺条件,并建立了结晶产率预测模型。根据晶体生长扩散理论,开展了三方硼镁石结晶机制及动力学研究,获得结晶速率方程。基于盐湖硼镁资源综合利用策略,探究了盐湖氯化镁饱和老卤合成三方硼镁石的可行性。结果表明:RSM优化后结晶产率(以B2O3计)预测值为80.56%,实际值为81.58%,相对误差为1.25%,模型可靠,结晶产率显著提高;三方硼镁石晶体生长机制为多核表面反应控制,符合MA-2模型,结晶速率明显增大;以氯化镁饱和老卤为原料合成三方硼镁石的结晶产率大于74%,其主要原因是硼浓度的降低及共存SO42-对溶液中多硼物种影响机制的不同。研究为玻璃用水合硼酸镁工业化生产提供技术支撑,同时为盐湖卤水硼镁资源综合利用拓展新思路。

关键词: 三方硼镁石, 响应曲面法, 结晶工艺, 动力学, 氯化镁饱和老卤

Abstract:

Magnesium borate is an important boron-containing raw material in the production of alkali-free glass fiber and ceramics.To address issues such as slow reaction rates,low yields,and high costs in the laboratory synthesis of the hydrated magnesium borate(e.g,macallisterite) for glass applications,a study was conducted on the crystallization process and kinetics of macallisterite in the concentrated salt solutions of MgCl2-xNa2yB2O3-H2O.Firstly,based on MgCl2·6H2O,NaOH and H3BO3 as raw materials,the response surface methodology(RSM) was used to design and optimize the crystallization process conditions of macallisterite,and a crystallization yield prediction model was established.Secondly,based on the theory of crystal growth diffusion,the crystallization mechanism and kinetics of macallisterite were studied,and the crystallization rate equation was obtained.Finally,based on the comprehensive utilization strategy of boron and magnesium resources in salt lakes,the old brine saturated with magnesium chloride was used as raw matrerials to synthesize the macallisterite.The results showed that the predicted boron crystallization yield was 80.56% in B2O3 according to the RSM model,and the experimental value was 81.58% with a relative error of 1.25%.It indicated that the model was reliable and the crystallization yield was improved.The growth mechanism of the macallisterite was the multi-nucleus controlled crystal surface growth model of MA-2,and the crystallization rate was significantly increased.The crystallization yield of the macallisterite synthesized from the old brine was more than 74%,which was lower than that of the optimization experiment.The main reason was due to the decrease in boron concentration and the different mechanisms by which coexisting SO42- ions affect the multi boron species in the solution.The above research not only provided technical support for the industrial production of hydrated magnesium borate for glass,but also provided new ideas for the comprehensive utilization of boron and magnesium resources in salt lake brine.

Key words: macallisterite, response surface methodology, crystallization process, kinetics, salt lake brine

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