硝酸分解磷矿的宏观动力学研究

The Research of Macrodynamics for the Phosphate Rock Decomposition with Nitric Acid

在间歇反应器中 ,反应温度为 30～ 6 0℃、硝酸的初始ω(HNO3 )为 30 %～ 5 4 %、磷矿粉初始粒度 0 1875～ 0 5 375mm、搅拌器转速在 4 0 0r/min的条件下 ,研究了硝酸分解磷矿的反应过程机理及宏观动力学。实验结果表明 ,磷矿分解速率及转化率随着搅拌强度、反应温度、硝酸浓度和磷矿粉细度的增加而增加 ,氢离子通过液膜的扩散传质是该过程的速率控制步骤。应用固体粒度减小的缩芯模型 ,将各影响因素的实验数据回归 。

Under the condition that the reaction temperature is 30 ℃ to 60 ℃,the primary ω(HNO 3) is 30% to 54%,the primary particle size of the phosphate rock powder is 0.1 875 to 0.5 375 mm in the batch reactor and the speed of revolution of the agitator is 400 r/min,it studies the mechanism of the reaction procedure of the phosphate rock decomposition with nitric acid and the macrodynamics.The experiment result improves that the decomposition rate of the phosphate rock and conversion rate are increased with the increment of the agitation strength,reaction temperature,the nitric acid concentration and the fineness of the phosphate rock powder.The diffused mass transfer of hydrogen ion through the liquid membrane is the rate control procedure of the process.It regresses the experiment data of each influencing factor with the reduced core model of the solid particle to obtain the macrodynamics model of the phosphate rock decomposition with nitric acid.