选择性浸出低品位钙质磷块岩动力学研究  

Study on selective leaching kinetics of low-grade phosphate rock

作　　者：王建蕊 张杰[2,3] 莫樊 WANG Jianrui;ZHANG Jie;MO Fan(Guiyang University Guizhou Guiyang 550005,Ch ina;School of Mining Technology,Guizhou University,Guiyang Guizhou 550025,China;Key Laboratory of Comprehensive Utilization of Nonmetallic Mineral Resources,Guiyang Guizhou 550025,China;School of Architectural Engineering,Guizhou Minzu University,Guiyang Guizhou 550025,China)

机构地区：[1]贵阳学院,贵州贵阳550005 [2]贵州大学矿业学院,贵州贵阳550025 [3]贵州省非金属矿产资源综合利用重点实验室,贵州贵阳550025 [4]贵州民族大学建筑工程学院,贵州贵阳550025

出　　处：《化工矿物与加工》2019年第8期36-40,共5页Industrial Minerals & Processing

基　　金：国家自然科学基金项目(51164004);2018贵阳学院博士科研启动项目(K1631000163)

摘　　要：用柠檬酸作为浸出剂研究了贵州织金低品位钙质磷块岩的浸出动力学,结果表明,氧化钙的浸出率随柠檬酸的质量分数增加而增大,矿石粒度对浸出率的影响效果不显著;浸出过程可以用一级未反应芯缩核模型较好地描述,其动力学方程为1-(1-a)^1/3=3.67×10^4e^-36.63/RTt,表观活化能为36.63kJ/mol,动力学控制步骤为化学反应控制。The leaching kinetics of low-grade calcareous phosphate ore in Zhijin,Guizhou was studied with citric acid as leaching agent.The leaching results showed that the leaching rate of calcium oxide increased with the increase of acid concentration,and the effect of particle size on the leaching rate was not significant.The leaching process could be well described by the first-order unreacted shrinkage core model with the kinetic equation being,the apparent activation energy being 36.63 kJ/mol and the kinetic control step being chemical reaction control.

关 键 词：低品位磷块岩 柠檬酸 表观活化能 选择性浸出 浸出动力学 

分 类 号：TD971[矿业工程—选矿] TD925.6