(四川大學(xué) 化工學(xué)院， 成都 610065)
摘 要: 研究了高硅硫化鋅精礦氧化焙燒過程中硅酸鋅生成反應(yīng)的動力學(xué)。確定了溫度、粒度對硅酸鋅反應(yīng)速率的影響，結(jié)果指出：硅酸鋅生成反應(yīng)的動力學(xué)符合收縮核模型，其過程為固膜擴(kuò)散控制。測定了各反應(yīng)條件下的反應(yīng)速率常數(shù)并測得其活化能為406kJ/mol。提出了硅酸鋅生成反應(yīng)的總動力學(xué)方程。限制硅酸鋅反應(yīng)速率的有效方法是適當(dāng)提高精礦粒度和降低焙燒溫度至860℃左右。
關(guān)鍵字: 硅酸鋅; 焙燒; 動力學(xué)
（College of Chemical Engineering,
Sichuan University, Chengdu 610065, P.R.China）
Abstract:The kinetics of formation reaction of Zn2SiO4 during roasting the sphalerite concentrate with high silica was investigated. The effects of temperature, particle size on the formation rate of Zn2SO4 were also studied. The results show that the kinetics of formation reaction of Zn2SiO4 fits a shrinking core model, and the control step is solid film diffusion. The activation energy was calculated to be 406 kJ/mol and the rate constants were determined. Thus a general kinetic rate equation was developed. The effective method of controlling rate formation of Zn2SiO4 is to increase properly the particle size and lower the temperature to 860 ℃ or so.
Key words: Zn2SiO4; roasting; kinetics
