CAJ | 학술논문

采用液-固多相反应的缩芯模型研究了石煤灰渣中V_2O_5的浸出动力学,考察了酸浸温度、硫酸浓度对V_2O_5浸出反应速率的影响.结果表明,在实验温度范围内,V_2O_5的浸出过程为同膜扩散控制,浸出反应的表观活化能为29.96 kJ/mol.当硫酸浓度小于6 mol/L时,浸出属化学反应控制过程;当硫酸浓度大于6 mol/L时,浸出过程为固膜扩散控制,其表观反应级数为1.199.提高酸浸温度可提高V_2O_5的浸出率;在硫酸浓度小于6 mol/L时提高硫酸浓度,可提高V_2O_5的浸出率:而高于该值提高硫酸浓度对V_2O_5浸出率的提高无明显作用.
채용액-고다상반응적축심모형연구료석매회사중V_2O_5적침출동역학,고찰료산침온도、류산농도대V_2O_5침출반응속솔적영향.결과표명,재실험온도범위내,V_2O_5적침출과정위동막확산공제,침출반응적표관활화능위29.96 kJ/mol.당류산농도소우6 mol/L시,침출속화학반응공제과정;당류산농도대우6 mol/L시,침출과정위고막확산공제,기표관반응급수위1.199.제고산침온도가제고V_2O_5적침출솔;재류산농도소우6 mol/L시제고류산농도,가제고V_2O_5적침출솔:이고우해치제고류산농도대V_2O_5침출솔적제고무명현작용.
The leaching kinetics of vanadium pentoxide from ash of stone coal by sulfuric acid was approached using the shrinking unreacted core model for the reaction between liquid and solid. The influences of temperature and sulfuric acid concentration on the reaction rate of vanadium pentoxide were investigated. The results show that the diffusion through the solid film was the rate limiting step in the leaching process of vanadium pentoxide within the selected temperature range from 30 to 115 ℃, and the apparent activation energy was calculated to be 29.96 kJ/mol. In the selected sulfuric acid concentration range from 3.0 to 6.0 mol/L, the rate limiting step changed from chemical reaction to diffusion through solid film when sulfuric acid concentration was over 6 mol/L. The apparent reaction progression was 1.199. The leaching rate was increased by enhancing the temperature. When sulfuric acid concentration was less then 6 mol/L, the leaching rate was remarkably increased by enhancing the sulfuric acid concentration. But the leaching rate was little affected as the sulfuric acid concentration was over 6 mol/L.