微波协同条件下钾长石低温提钾工艺研究

探讨了微波协同条件下钾长石低温提钾工艺过程。在微波消解仪中使用化学试剂与钾长石反应，分析各影响因素对钾溶出率的影响。研究结果表明：钾长石粒径越小，钾的溶出率越高；硫酸质量分数增大，溶出率逐步增大；溶出率随反应温度的上升而增加，在反应温度达到160 ℃时，钾提取率趋于稳定。利用响应面分析法对钾长石提取工艺条件进行优化，最终确定最佳实验条件：硫酸质量分数为70%，钾长石与磷矿质量比为0.8∶1，氟化钙与磷酸钙质量比为3∶1，温度为160 ℃，钾提取率达到83%以上。

Study on potassium extraction technology from K-feldspar assisted with microwave at low temperature

Potassium extraction technology from K-feldspar assisted with microwave at low temperature was discussed.Effects of different parameters on potassium dissolution rate were analyzed when chemical reagents reacted with K-feldspar in a microwave digestion system under different conditions.Results showed that potassium dissolution rate increased with decreasing K-feldspar size.Increasing reaction temperature and the mass fraction of sulphuric acid can increase higher potassium dissolution rate.Potassium extraction efficiency remained stable when increasing reaction temperature to 160 ℃.The optimized operation conditions were obtained by using response surface methodology（RSM）.Above 83% of the potassium extraction efficiency was obtained under experimental conditions: the mass fraction of sulphuric acid was 70%，the mass ratio of K-feldspar to phosphorite was 0.8∶1，the mass ratio of calcium fluoride to calcium phosphate was 3∶1， and the temperature was 160 ℃.