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Marcelo Bernuy Zumaeta - 馬世隆

- Thesis topic: Stabilization of Fly Ash with novel flux agent in atmospheric-pressure microwave plasma reactor

- Doi: https://doi.org/10.6840/cycu202201321

- Abstract: 

        Currently, fly ash generated by incinerators can cause many problems not only in the environmental aspect, due to its high content of toxic compounds and heavy metals, but also in the economic aspect since more resources are required for its treatment and final disposal. The present work aims to stabilize fly ash using shell as a flux agent in the microwave plasma reactor. The study has two experimental stages: the first one focuses on treating the fly ash preparing three combinations using two types of gases (argon and nitrogen), and the second stage is based on using three types of ratios with different flux agents and values for parameters of power, flow, and time, using a simple Taguchi design (L9). The results show that combination 3 (Fly ash + Shell + Quartz + Alumina + Glass), has the best result in toxicity reduction, with a metal removal of: As (89%), Hg (100%), Cd(88%), Cr (79%) Cu (79), Pb (88%) and Se (97%), as well as the mineralogical composition (Wollastonite, Gehlenite, Mullite and Calcite), being the nitrogen with the best performance as carrier gas; and for the second stage, sample 3, with the parameters and values of: power-1000w, flow- 12L/M, time-9 minutes and ratio- 4:2:1:1:2; obtaining the same mineralogical composition rich in SiO2, Al2O3 and CaCO3. In terms of gas residues results, Argon gas shows a good performance in degradation of VOC: 25.4ppm (control) and 24.4ppm after treatment with flux agents. It is concluded that it is possible to stabilize fly ash using powder shell with the support of conventional flux agents to obtain a new recycled material for construction.

Keywords: Fly ash, Flux agents, Heavy metals, Microwave plasma, Vitrification.

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