由钾明矾热分解法制备氧化铝和硫酸钾实验研究  

Research on preparation of alumina and potassium sulfate from alum by pyrolytic process

作　　者：沈延彬 韩效钊[1] 刘志雪[1] 张旭[1] 刘昆[1] 

机构地区：[1]合肥工业大学化学与化工学院,安徽合肥230009

出　　处：《磷肥与复肥》2016年第3期10-12,18,共4页Phosphate & Compound Fertilizer

基　　金：广东省教育部产学研结合项目(2011B090400174)

摘　　要：采用重结晶方法对钾长石氟化学酸解法产物钾明矾进行提纯,通过焙烧-水浸等工艺制备硫酸钾和氧化铝。实验表明,较适宜工艺条件为:焙烧温度850℃、焙烧时间20 min、水浸温度100℃、水浸固液比1/5 g/m L、水浸时间20 min;氧化铝总收率86.52%,硫酸钾总收率85.02%;氧化铝纯度98.52%,符合GB/T 24487—2009氧化铝标准;硫酸钾中K2O质量分数为47.85%,符合GB 20406—2006农用硫酸钾标准。The potassium sulphate and aluminium oxide are prepared by roasting-water leaching potassium alum, which is produced by recrystallizing the product of acid-splitting potassium feldspar with fluorine chemical method. Results show： the optimum conditions are roasting temperature of 850 ℃, roasting time of 20 min, leaching temperature of 100 ℃, the ratio of solid to liquid of 1/5 g/mL, and the leaching time of 20 min; The yield coefficient of aluminium oxide and potassium sulfate are 86.52% and 85.02% respectively; The purity of aluminium oxide is of 98.52%, which conforms to the standards of GB/T 24487--2009; The content of potassium oxide in potassium sulfate is 47.85%, which conforms to the standards of agricultural potassium sulfate in GB 20406-2006.

关 键 词：钾长石 钾明矾 氧化铝 硫酸钾 

分 类 号：TQ443.5[化学工程—化学肥料工业] TF803.22[冶金工程—有色金属冶金]