Effect of Mechanical Grinding Process on the Morphology of Rare Earth Elements in Ion-adsorbed Rare Earth Ores
Ion adsorption type rare earth ores(IAREO)are a type of weathered ore deposit where rare earth elements are adsorbed on the surface of clay minerals in the form of hydrated or hydrated hydroxyl groups.This study found for the first time that dry grinding conditions for this type of ore can cause changes in the rare earth phase state.Through simulation experiments,it was confirmed that mechanical grinding has an impact on the changes in the ion phase rare earth content in the ore and its phase transition path.The results showed that the reduced Ion-exchangeable(F2)in the ore after grinding are mainly converted into Carbonate-bound(F3),and a few are converted into Fe-Mn oxide-bound(F5)and Humic bound(F4).Among them,F2 decreased by 53.48%,while F3 increased by 36.05%.The evidence from XRD and FTIR indicates that the mechanical grinding process can cause structural damage to clay minerals,and the crystal structure is deformed,causing the lattice damage of clay minerals and the appearance of disordered features.The occurrence of mechanochemical processes accompanying mechanical grinding may be the key reason for the reduction of ion phase rare earths,changes in rare earth occurrence state,and transfer between forms after mechanical grinding;It has important implications for the development of exploration specifications for ion adsorption type rare earth minerals,ore processing technology,development process of standard materials,analysis and testing,and research on mechanical grinding mechanisms of clay mineral.The reduction of ion phase rare earths caused by mechanical grinding of ion adsorption type rare earth ores is an important new discovery in the deposits.
IAREOmechanical grindingstructural damageREE occurrence statecarbonate bound state
NETL
NSTL
万方数据
