微波协同条件下钾长石低温提钾工艺研究  

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

作　　者：徐畅[1] 赵建海[1] 赵晶星 

机构地区：[1]天津城建大学环境与市政工程学院,天津300384

出　　处：《无机盐工业》2015年第7期24-28,共5页Inorganic Chemicals Industry

基　　金：化学工程联合国家重点实验室开放课题(SKL-Ch E-13C03)

摘　　要：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。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 mi- crowave digestion system under different conditions.Resuhs 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 disso- lution rate.Potassium extraction efficiency remained stable when increasing reaction temperature to 160 ℃.The optimized op- eration conditions were obtained by using response surface methodology （RSM）.Above 83% of the potassium extraction effi- ciency 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 ℃.

关 键 词：微波 钾长石 提钾 

分 类 号：TQ131.13[化学工程—无机化工]