钾长石提钾新工艺研究

New process of extracting potassium feldspar

对钾长石与磷矿、磷酸脲反应的提钾新工艺进行了研究,分析了不同组合反应体系的有效钾溶出率。实验结果表明:钾长石、磷矿、磷酸脲体系分解钾长石是可行的;各个因素影响有效钾溶出率的次序从大到小为:反应温度、反应时间、磷酸用量、尿素和磷酸的摩尔比;实验条件下优水平的工艺条件为:尿素和磷酸的摩尔比为0.65∶1,磷酸(质量分数50%)用量1.56g,反应温度130℃,反应时间3h。在此条件下有效钾的溶出率可达95.41%,水溶性钾溶出率可达23.20%。单因素寻优实验得出钾长石与磷矿、磷酸脲反应提取有效钾的工艺适宜条件为:反应温度110～120℃,反应时间1.5～2.5h,磷酸用量1.30～1.56g。

The technology of refining potassium from potassium feldspar with phosphate rocks and urea phosphate was studied with the analysis on the effective potassium dissolution rate of the different combination of reaction systems. The experiment shows that the study on the potassium feldspar with phosphate rocks and urea phosphate system to resolve potassium feldspar is feasible; the segluence of factors in importance ,which affected the effective potassium dissolution ratio is： reaction temperature, reaction time, dosage of phosphate acid, the mole ratio of urea and phosphate acid. The optimal process conditions under the experimental conditions are as follows： the mole ratio of urea and phosphate acid 0. 65 ： 1, phosphate acid （mass fraction 50%） dosage 1.56 g, reaction temperature 130 ℃, reaction time 3 hours. On this condition, the effective potassium dissolution rate could be up to 95.41%, water-soluble potassium dissolution rate could reach 23.20%. The suitable process conditions by the single factor optimization experiments are as follows; reaction temperature 110～ 120 ℃, reaction time 1.5～2.5 h, phosphate acid dosage 1.30～1.56 g.