石煤与软锰矿焙烧样耦合提取钒锰的动力学

摘要

In order to realize the co-extraction of vanadium from roasted stone coal and manganese from roasted low-grade pyrolusite,the article tries to solve the excessive acid problem during the second stage process of sulfuric acidic roasting for stone coal.The effects of ore distribution ratio,liquid to solid ratio,and leaching temperature on the co-leaching efficiency of vanadium and manganese are investigated.The research shows that some references and basis for the industrial comprehensive utilization of stone coal and low-grade pyrolusite will get the high efficient co-extraction of vanadium and manganese. The result indicates that the vanadium and manganese leaching efficiency could be 98.13%and 99.45%,and respectively under the conditions the ore distribution ratio was 1∶1, the liquidto solid ratio was 5∶1 ,and the leaching temperature was 80℃.The leaching kinetics of vanadiumor manganese in the leaching coupling system indicates that the vanadium leaching process was controlled by the internal diffusion of solid product layer and the apparent activation energy could be 22.401 kJ/mol.Manganese leaching process under the low temperature zone 25 ~55℃was controlled by chemical reaction and the apparent activation energy was obtained to be 57.232 kJ/mol,while under the high temperature zone 65 ~95℃by internal diffusion of solid product layer with the apparent activation energy is 14.323 kJ/mol.%为实现石煤与软锰矿焙烧样中钒锰的共提取，并解决石煤二段硫酸化焙烧过程中酸过量的问题，通过多因素研究探讨石煤与低品位软锰矿焙烧样耦合浸出工艺对钒锰共浸出率的影响，为石煤及低品位软锰矿焙烧样中钒锰资源高效综合利用提供了参考和依据。试验结果表明，当石煤与低品位软锰矿焙烧样的配矿比为1∶1、矿浆液固比为5∶1及浸出温度为80℃时，耦合浸出体系中钒的浸出率可达98．13％，而锰的浸出率可达99．45％。对耦合浸出体系的钒锰浸出动力学研究表明，钒浸出过程是通过固体产物层的内扩散控制，其表观活化能为22．401 kJ/mol；锰浸出过程在低温区25～55℃下是通过化学反应控制，其表观活化能为57．232 kJ/mol，高温区65～95℃下锰浸出过程是通过固体产物层的内扩散控制，其表观活化能为14．323 kJ/mol。