In order to relieve the equipment corrosion,reduce chlorine and increase phosphorus contents in leaching solution,theleaching behavior of potassium from phosphorus-potassium associated ore in the mixed acids of hydroc...In order to relieve the equipment corrosion,reduce chlorine and increase phosphorus contents in leaching solution,theleaching behavior of potassium from phosphorus-potassium associated ore in the mixed acids of hydrochloric acid and phosphoricacid was investigated.The effects of various factors,such as mass fraction of hydrochloric acid,solid-to-liquid ratio,material ratio(CaF2dosage(g)/mass of ore(g))and leaching temperature were comprehensively studied.It was found that the dissolution fractionof potassium can reach more than86%under the optimum conditions of leaching temperature95°C,HCl concentration10%,leaching time6h,solid/liquid ratio1:5,and material ratio0.1.In addition,the leaching kinetics of potassium was successfullymodeled by a semi-empirical kinetic model based on the classic shrinking core model.The data showed that the leaching process ofpotassium was controlled by the product layer diffusion and the apparent activation energy for the process was found to be54.67kJ/mol over the temperature range from65to95°C.展开更多
基金Project(51274153) supported by the National Natural Science Foundation of ChinaProjects(2011CDA120,2015CFB523) supported by the Natural Science Foundation of Hubei Province of China+2 种基金Project(G201510) supported by the State Key Laboratory of Refractories and Metallurgy(Wuhan University of Science and Technology)ChinaProject(K201454) supported by the Youths Science Foundation of Wuhan Institute of Technology,China
文摘In order to relieve the equipment corrosion,reduce chlorine and increase phosphorus contents in leaching solution,theleaching behavior of potassium from phosphorus-potassium associated ore in the mixed acids of hydrochloric acid and phosphoricacid was investigated.The effects of various factors,such as mass fraction of hydrochloric acid,solid-to-liquid ratio,material ratio(CaF2dosage(g)/mass of ore(g))and leaching temperature were comprehensively studied.It was found that the dissolution fractionof potassium can reach more than86%under the optimum conditions of leaching temperature95°C,HCl concentration10%,leaching time6h,solid/liquid ratio1:5,and material ratio0.1.In addition,the leaching kinetics of potassium was successfullymodeled by a semi-empirical kinetic model based on the classic shrinking core model.The data showed that the leaching process ofpotassium was controlled by the product layer diffusion and the apparent activation energy for the process was found to be54.67kJ/mol over the temperature range from65to95°C.
