Effect of Activation Mode on the Activation of Silicon and Aluminum in Rare Earth Tailings AITranslate

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Chinese Library Classification Number:X753[环境科学与工程—环境工程]

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Rare earth tailings contain a considerable amount of silicon and aluminum species for molecular sieve synthesis,and the difficulty of green synthesis of molecular sieves from natural minerals lies in the mineral activation.In this paper,rare earth tailings,being used as raw materials,were activated in ways of thermal activation,alkali fusion activation,and sub-molten salt activation,respectively,to depolymerize the silica and aluminum species in the highly polymeric state of rare earth tailings into reactive mono-polymeric silica and aluminum species,setting the basis for the synthesis of molecular sieves,thus to realize the se-condary utilization of rare earth tailings.The chemical composition,phase structure,and surface micromorphology of the activated rare earth tailings were analyzed by XRF,XRD,and SEM-EDS characterization to investigate the effects of different activation modes on the activation of rare earth tailings.The results show that the SiO_2 crystal form in the thermally activated rare earth tailings is stable and the activation effect is not obvious;the rare earth tailings could be more completely activated by alkali fusion and sub-molten salt,and alkali fusion activation could realize more efficient activation of rare earth tailings.And at the same time,the increase of alkali fusion activation temperature can promote the activation of rare earth tailings.When the mass ratio of NaOH to rare earth tailings is 3 and the alkali fusion activation temperature is 450℃,the dissolution rates of reactive silica and aluminum species in rare earth tailings are 84.2%and 63%.The results of the study provide a certain theoretical basis for the green synthesis of molecular sieves from natural minerals and the secondary utilization of rare earth tailings resources.