## ZEOLITE SYNTHESIS FAU-TYPE FROM A GIBBSITIC-KAOLINITIC WASTE APPLYING FRACTIONAL FACTORIAL DOE

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Abstract
17-065 Caio César Amorim Melo Melo, C.A.(Universidade Federal do Pará); Melo, B.S.(Universidade Federal do Pará); Angélica, R.S.(Universidade Federal do Pará); Paz, S.A.(Universidade Federal do Pará); The fine-grained mineral waste produced in the beneficiation processes of kaolin and bauxite are a currently and relevant environmental issue, mainly in the amazon context, where the largest Brazilian reserves and industries of these two ores are located. It is estimated that about 580,000 and 8,000,000 tons-per-year of kaolin and bauxite wastes, respectively, are disposed in tailing ponds. In order to contribute to the resolution of this issue, great progress has been achieved using kaolin waste as a raw material for zeolite synthesis, showing that this kaolinitic material is an excellent sustainable source of ${\mathrm{SiO}}_{2}$ and ${\mathrm{Al}}_{2}{\mathrm{O}}_{3}$to produce synthetic zeolites. In this context, the purpose of this work was achieve the same success with a gibbsitic-kaolinitic waste from the washed bauxite. Thus, a fractional factorial experimental design (${2}_{\mathrm{V}}^{5-1}$) was used to evaluate the main experimental factors that influence the production of synthetic FAU-type zeolite. The experiments were carried out in hydrothermal system using NaOH solution. The products were analyzed by XRD and the peak intensities of the zeolitic phases were adopted as the response variables. The results showed that was possible to obtain FAU, EMT and SOD-type zeolites in this experimental region. Based on the results, it was possible to identify the main factors that influence the formation of Faujasite and to estimate from the desirability function a direction to an optimized experimental region where more Faujasite and less Sodalite can be formed.
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