新疆尉犁金云母表生风化的实验模拟研究

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

摘要:

本文在常压条件下模拟金云母蛭石化的地表风化环境，探讨金云母晶层向蛭石晶层转变的过程，研究不同氯化钠浓度下的混合溶液对金云母向蛭石转变过程的影响规律. 本文采用XRD、XRF、ICP、SEM研究转化过程中物相、结构、化学成分和微观形貌的变化，利用TG-DSC研究转化前后样品的热学性质的变化，并测定了样品的阳离子交换容量(CEC). 研究结果表明，金云母经模拟环境溶液处理后，发生了金云母晶层向蛭石晶层转化的现象，转化过程表现为金云母结构中K+含量明显降低，结构中引入水化钠离子，层电荷数降低，CEC提高. 本文的研究结果对于新疆尉犁蛭石矿床中低利用率的金云母矿物的开发利用具有一定意义.

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.