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 (3): 71-77.doi: 10.19964/j.issn.1006-4990.2024-0141

• 研究与开发 • 上一篇    下一篇

磷化工副产氟硅酸湿法合成氟化铝的工艺研究

邓智1(), 龙秉文1, 张逸1, 邓伏礼1, 戴亚芬1, 刘少峰2, 丁一刚1()   

  1. 1.武汉工程大学化工与制药学院,绿色化工过程教育部重点实验室,湖北 武汉 430073
    2.湖北宜氟特环保科技有限公司,湖北松滋 434200
  • 收稿日期:2024-03-12 出版日期:2025-03-10 发布日期:2025-03-21
  • 通讯作者: 丁一刚(1963- ),男,博士,教授,博士研究生导师,研究方向为磷化工及化工新产品合成;E-mail:ygding@wit.edu.cn
  • 作者简介:邓智(1996- ),男,硕士,研究方向为磷化工;E-mail:852549362@ qq.com

Study on wet synthesis process of aluminum fluoride from fluosilicic acid by-product of phosphorus chemical industry

DENG Zhi1(), LONG Bingwen1, ZHANG Yi1, DENG Fuli1, DAI Yafen1, LIU Shaofeng2, DING Yigang1()   

  1. 1. Key Laboratory for Green Chemical Process of Ministry of Education,School of Chemical Engineering and Pharmacy,Wuhan Institute of Technology,Wuhan 430073,China
    2. Hubei Yifute Environmental Protection Technology Co. ,Ltd. ,Songzi 434200,China
  • Received:2024-03-12 Published:2025-03-10 Online:2025-03-21

摘要:

通过对利用湿法磷酸副产物氟硅酸与氢氧化铝直接制备工业级氟化铝的工艺进行研究与优化,以期提高氟化铝产品的质量。这不仅充分利用了氟资源,优化了合成工艺,而且对添加聚乙二醇(PEG)提高氟化铝产品的松装密度着重开展了研究。结果表明,当氟硅酸预热温度为80 ℃、氟硅酸质量分数为19.1%、n(氢氧化铝)∶n(氟硅酸)为1.8∶1、氢氧化铝干粉快速投料,控制反应温度为95~107 ℃、搅拌速率为400 r/min、反应时间为16 min、添加氟化铝为晶种、结晶时间为5.0 h、结晶温度为107 ℃时,氟化铝收率为77.56%,氟化铝的松装密度为0.70 g/cm3。以聚乙二醇为结晶改性剂制备氟化铝,添加聚乙二醇的用量为7.40%、结晶时间为5.0 h、结晶搅拌速率为200 r/min、结晶温度为107 ℃时,氟化铝收率为81.45%,氟化铝松装密度达到0.83 g/cm3,松装密度提高了18.57%。氟化铝产品的化学成分和物理性能均能达到GB/T 4292—2017《氟化铝》的要求。以磷化工副产氟硅酸和工业级氢氧化铝为原料,优化了氟硅酸湿法制备氟化铝的工艺,使得氟化铝产品的收率和松装密度有所提高,为磷化工行业副产品氟硅酸的推广应用提供了技术支撑。

关键词: 氟硅酸, 氟化铝, 收率, 松装密度

Abstract:

In this paper,the process of directly preparing industrial grade aluminum fluoride by using fluorosilicic acid and aluminum hydroxide,a by-product of wet-process phosphoric acid was studied and optimized in order to improve the quality of aluminum fluoride products.It not only made full use of fluorine resources and optimized the synthesis process,but also focused on the study of adding polyethylene glycol(PEG) to improve the apparent density of aluminum fluoride products.The results showed that when the preheating temperature of fluorosilicic acid was 80 ℃,the mass fraction of fluorosilicic acid was 19.1%,the molar ratio of n(aluminum hydroxide)∶n(fluorosilicic acid) was 1.8∶1,the dry powder of aluminum hydroxide was rapidly fed,the reaction temperature was 95~107 ℃,the stirring speed was 400 r/min,the reaction time was 16 min,aluminum fluoride was added as seed crystal,the crystallization time was 5.0 h,and the crystallization temperature was 107 ℃,the yield of aluminum fluoride was 77.56%,and the apparent density of aluminum fluoride was 0.70 g/cm3.Aluminum fluoride was prepared by using polyethylene glycol as a crystal modifier.When the amount of polyethylene glycol was 7.40%,the crystallization time was 5.0 h,the crystallization stirring speed was 200 r/min,and the crystallization temperature was 107 ℃,the yield of aluminum fluoride was 81.45%.The apparent density of aluminum fluoride reached 0.83 g/cm3,and the apparent density was increased by 18.57%.The chemical composition and physical properties of aluminum fluoride products could meet the requirements of GB/T 4292—2017 “aluminum fluoride”.In this paper,the process of wet preparation of aluminum fluoride by fluorosilicic acid was optimized by using fluorosilicic acid and industrial grade aluminum hydroxide as raw materials,which improved the yield and apparent density of aluminum fluoride products,and provided technical support for the popularization and application of fluorosilicic acid,a by-product of phosphorus chemical industry.

Key words: fluorosilicic acid, aluminum fluoride, yield, apparent density

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