Experimental simulation study on the surface weathering of phlogopite in Yuli, Xinjiang

Abstract:

The surface weathering environment of phlogopite vermiculization was simulated under atmospheric pressure, the transformation process from phlogopite crystal layer to vermiculite crystal layer was discussed, and the effects of mixed solutions under different sodium chloride concentrations on the transformation process from phlogopite to vermiculite were studied. XRD, XRF, ICP and SEM were used to study the changes of phase, structure, chemical composition and micro morphology during the transformation. TG-DSC was used to study the changes of thermal properties of the samples before and after the transformation, and the cation exchange capacity (CEC) of the samples was measured. The results show that the transformation from phlogopite crystal layer to vermiculite crystal layer occurs after being treated with simulated environmental solution. The transformation process shows that the content of K+ in phlogopite structure is significantly reduced, sodium hydrate ion is introduced into the structure, the number of layer charges is reduced and CEC is increased. The research results have certain significance for the development and utilization of phlogopite minerals with low utilization rate in Yuli vermiculite deposit, Xinjiang.