Effects of Reagent Concentration and Particle Size on Diffusion Rate of Mixed Ores with Rare Elements |
| X.Z. Yang and L. Zhang
School of Sciences, Changchun University, Changchun 130022, P.R. China |
| Received: July 23, 2012; in final form: March 16, 2013 |
| Full Text PDF |
| The leaching reaction kinetics of weathered crust elution-deposited rare earth with mixed ammonium salts was studied. The influence of concentration of reagents and particle size of ore on leaching rate was investigated. The results showed that the diffusion process and leaching rate could be improved by increasing reagents concentration and decreasing leaching flowing rate and particle size. The leaching process could be explained with the shrinking core model, which could be controlled by the diffusion rate of reacting reagents in porous solid layer. The leaching rate obeyed the equation as 1-2/3η-(1-η)2/3=7.126×10-4C0.3038R0.1942t. |
DOI: 10.12693/APhysPolA.124.66 PACS numbers: 66.30.Fq, 91.65.Rg |