微硅粉碱溶脱硅及其反应动力学

发布时间：2018-04-02 06:10

  本文选题：微硅粉　切入点：碱溶液　出处：《环境工程学报》2017年04期

【摘要】：研究了微硅粉在氢氧化钠溶液中的碱溶行为和反应动力学。采用X射线荧光光谱(XRF)、X射线衍射(XRD)、红外光谱(FT-IR)和扫描电镜(SEM)等对微硅粉进行了表征分析。通过正交实验和单因素实验相结合分析了反应温度、反应时间、初始氢氧化钠浓度和灰碱比对微硅粉中二氧化硅溶出率的影响;采用"等高切面法"分析计算了微硅粉的碱溶反应动力学参数。结果表明:反应温度和碱浓度对碱溶反应的影响最为显著;微硅粉碱溶脱硅的最优工艺条件为反应温度120℃、反应时间60 min、初始氢氧化钠浓度10%、灰碱比为0.89,在此条件下,二氧化硅的溶出率为91.5%,微硅粉碱溶脱硅反应的表观活化能为16.21 k J·mol~(-1),反应级数为1。
[Abstract]:The alkali dissolution behavior and reaction kinetics of microsilica powder in sodium hydroxide solution were studied. The microsilica powder was characterized by X-ray fluorescence spectroscopy (XRF), X-ray diffraction (IR) and scanning electron microscopy (SEM). The reaction temperature was analyzed by combining the test and the single factor experiment. The effects of reaction time, initial concentration of sodium hydroxide and ratio of ash to alkali on the dissolution rate of silica in microsilica powder; The kinetic parameters of alkali dissolution reaction of microsilica powder were calculated by iso-high section method. The results showed that the reaction temperature and alkali concentration had the most significant influence on the alkali solution reaction, and the optimum technological conditions for alkali dissolution and desilication of microsilica powder were 120 鈩，

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