摘要
以菱镁矿为原料,制备轻烧氧化镁,并对轻烧氧化镁的水化动力学进行研究,考察水化温度,氧化镁质量浓度和颗粒度对水化过程的影响。研究结果表明:煅烧温度和保温时间对氧化镁活性影响要比颗粒度的大,最佳煅烧条件是温度为750℃,煅烧时间为1.5 h,颗粒度为1 mm;氧化镁的水化反应过程为内扩散控制类型,表观反应活化能为23.78 kJ/mol,在此基础上,用MATLAB做多元线性归回分析,得到表观反应速率常数关于水化温度、氧化镁浓度和颗粒度的经验表达式。
Light-burned magnesia was prepared from magnesite ore,and the hydration dynamic of light-burned magnesia was investigated.The effects of temperature(θ),mass concentration of magnesia(ρ0) and particle size(r0) of magnesia on hydration kinetics were studied.The calcination tests show that calcination temperature(θ) and heating time(t) have greater influence than the particle size(r0) on the activity of magnesia.And the best calcination condition is that θ=750 ℃,t=1.5 h,and r0=1 mm.The hydration process of magnesia is controlled by intra-particle diffusion,and the apparent activation energy is 23.78 kJ/mol.Based on the theory model,an experiential formular including three parameters(θ,c0 and r0) is proposed through MATLAB multiple regression analysis.
出处
《中南大学学报(自然科学版)》
EI
CAS
CSCD
北大核心
2011年第12期3912-3917,共6页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(20876160)
国家支撑计划项目(2006BAB02A11)
关键词
活性氧化镁
水化率
水化反应
动力学
内扩散控制
active magnesium oxide
hydration rate
hydration reaction
dynamics
intra-particle diffusion control