Resumo Para atender às normas ambientais que limitam as emissões de SO 2 na atmosfera, usinas termelétricas e siderúrgicas utilizam lama de cal para aprisionar os gases de efeito estufa por meio do processo Flue Gas Desulfurization (FGD) gerando o resíduo denominado gesso FGD. Inicialmente, o gesso FGD foi caracterizado por meio de ensaios de difração de raios X, espectrometria de fluorescência de raios X, índice de plasticidade, teor de umidade e granulometria a laser. Foi verificado que o gesso FGD é constituído principalmente de enxofre e cálcio, de composição química similar ao gesso natural, podendo ser estudados meios para aplicações destinadas ao mesmo, em especial, na construção civil tal como o tijolo solo-cimento. Com isso, a pesquisa teve como objetivo caracterizar o gesso FGD para utilização em tijolo solo-cimento. Palavras-chave: Gesso FGD; Carvão mineral; Dessulfuração; Tijolo solo-cimento. POTENTIALITIES OF RESIDUE OF THE FGD SYSTEM USED IN DESULFURATION GASES FROM A COQUERIA Abstract To meet environmental standards limiting SO 2 emissions into the atmosphere, thermoelectric and steel mills use lime sludge to trap greenhouse gases through the Flue Gas Desulfurization (FGD) process. Initially, FGD gypsum was characterized by X-ray diffraction, X-ray fluorescence spectrometry, plasticity index, moisture content and laser grain size. It was verified that the FGD gypsum consists mainly of sulfur and calcium, with a chemical composition similar to natural gypsum, and it is possible to study means for the application of gypsum, especially in civil construction, such as soil-cement brick. With this, the research had as objective to characterize the FGD gypsum.
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