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›› 2012, Vol. 12 ›› Issue (2): 212-217.

• 反应与分离 • 上一篇    下一篇

微硅粉中SiO2在稀碱液中的溶解行为及动力学

张金梁 郭占成 支歆 唐惠庆   

  1. 北京科技大学钢铁冶金新技术国家重点实验室 北京科技大学生态与循环冶金教育部重点实验室 北京科技大学生态与循环冶金教育部重点实验室 北京科技大学生态与循环冶金教育部重点实验室
  • 收稿日期:2012-01-09 修回日期:2012-02-20 出版日期:2012-04-20 发布日期:2012-04-20
  • 通讯作者: 郭占成

Dissolution Behavior and Kinetics of Fine Silica Powder in Dilute Alkaline Solution

ZHANG Jin-liang GUO Zhan-cheng, ZHI Xin TANG Hui-qing   

  1. Sate Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing (1. Academic of Metallurgical and Ecological Engineering，University of Science and Technology Beijing (1. Academic of Metallurgical and Ecological Engineering，University of Science and Technology Beijing Key lab. of ecological and recycle metalluargy, University of Science and Technology Beijing
  • Received:2012-01-09 Revised:2012-02-20 Online:2012-04-20 Published:2012-04-20
  • Contact: GUO Zhan-cheng,

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摘要： 研究了微硅粉中SiO2在稀碱溶液中的溶解行为及溶解动力学，考察了反应时间、NaOH初始浓度及反应温度对SiO2浸出率的影响，并分析了原料和浸出渣的物相. 结果表明，SiO2的浸出率随碱初始浓度和反应温度增加而增加. 微硅粉中无定型SiO2在NaOH稀碱液中的溶解表观活化能为18 kJ/mol，说明该溶解反应由扩散控制.

关键词: 微硅粉, 稀碱液, 浸出渣, SiO2, 溶解动力学

Abstract: The dissolution behavior and dissolution kinetics of fine SiO2 powder in dilute alkaline solution were studied. The effects of initial concentration of NaOH, reaction time and reaction temperature on the dissolution rate of fine silica powder were investigated. XRD was used to analyze the phases of fine silica powder and leaching residue. The results demonstrated that SiO2 dissolution rate increased with initial concentration of NaOH and reaction temperature. Dissolution apparent activation energy of the amorphous SiO2 of fine silica powder in dilute NaOH solution was 18 kJ/mol. Dissolution reaction was controlled by diffusion.

Key words: fine silica powder, low-concentration alkali solution, leaching residue, SiO2, dissolution kinetics

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