过磷酸钙颗粒的溶解动力学研究  

Study on dissolution kinetics of single superphosphate granules in water

作　　者：化全县[1] 韩亚伟[1] 汤建伟[1] 刘咏[1] 刘丽[1] 芦雷鸣[1] 

机构地区：[1]郑州大学化工与能源学院国家钙镁磷复合肥技术研究推广中心,河南郑州450001

出　　处：《磷肥与复肥》2016年第5期10-12,共3页Phosphate & Compound Fertilizer

基　　金：中国地质调查局地质调查项目(No.12120113087700);河南省科技攻关计划项目(142102210491)

摘　　要：过磷酸钙颗粒溶解机制及养分释放过程直接影响磷素利用率。通过研究20、25、30、35、40℃下过磷酸钙颗粒的溶解过程,明确过磷酸钙颗粒溶解过程符合缩芯模型,控制步骤先后为内扩散控制、界面和外扩散联合控制两个阶段,模型方程均达到线性显著水平(P<0.05),且扩散控制步骤的转换渐进完成。研究结果对促进过磷酸钙的应用和提高肥料利用率研究具有科学意义。Phosphorus efficiency is directly influenced by dissolution mechanism of single superphosphate granules and the nutrient release. The dissolution process of single superphosphate granules is investigated in water at the temperature of 20, 25, 30, 35, 40 ℃, the results show the dissolution process of single superphosphate granules conform to shrinking core model, the control step successively falls into internal diffusion control, and interface-external diffusion control, the model equations are linear significant level （P 〈 0.05）, and diffusion control step conversion is gradually completed. The conclusions have scientific significances on promoting single superphosphate application and increasing fertilizer efficiency.

关 键 词：过磷酸钙颗粒 缩芯模型 内扩散控制 界面-外扩散联合控制 

分 类 号：TQ442.11[化学工程—化学肥料工业]