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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 recrystallization method was used to purify the potassium alum from the K-feldspar chemical chemical solution, and potassium sulphate and alumina were prepared by roasting-water immersion process. The experimental results showed that the optimum conditions were as follows: calcination temperature 850 ℃, calcination time 20 min, water immersion temperature 100 ℃, water-solid-liquid ratio 1/5 g / m L, water immersion time 20 min, total alumina yield 86.52 %, The total yield of potassium sulfate is 85.02%; the purity of alumina is 98.52%, which conforms to the standard of GB / T 24487-2009 alumina; the K2O content of potassium sulfate is 47.85%, which meets the standard of GB 20406-2006 agricultural potassium sulfate.