tailieunhanh - Waste Management 2009 Part 8

Tham khảo tài liệu 'waste management 2009 part 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Solid Waste Management through the Application of Thermal Methods 119 CuKa radiation from 10 20 70 at a scanning speed of min using a Siemens D5000 powder X-ray diffraction unit operating at 30 mA and 40 kV. The XRD analysis patterns are shown in Fig. 18 and 19 for water quenched and air-cooled slag respectively. 90 80 Ĩ - cristobalite - corundum - mayenite - iron aluminum oxide - titanium silicon W WW 70 Fig. 19. XRD of the air-cooled slag Fig. 18. XRD of the water quenched slag The XRD pattern Fig. 18 indicates that the water quenched slag is composed of mainly amorphous and traces of crystalline phase. Crystalline phases were identified by comparing intensities and positions of Bragg peaks with those listed in the Joint Committee on Powder Diffraction Standards JCPDS data files. The crystalline phases that could be identified were cristobalite SiO2 corundum Al2O3 mayenite Ca12Al14O33 and iron aluminum oxide . The XRD pattern of the air cooled slag revealed an amorphous phase and no crystalline structures or phases are observed Fig. 19 . The formation of glassy amorphous structures 120 Waste Management drastically reduces the specific surface area and present better resistance to the decomposition by an acid than the crystalline structure. The SEM micrographs in Fig. 20 illustrate the morphology of the two slag types. More specifically no significant differences were noted and the common conclusion is that both water-cooled and air-cooled slags are characterized as equable. Water-cooled slag granules Air-cooled slag Fig. 20. SEM images Consequently the SEM images make us conclude that the slight crystalline areas present in water quenched slag are enclaved and therefore both types of solid residues are considered really stable and inert. Solid Waste Management through the Application of Thermal Methods 121 On the basis of the primary results derived from the operation of the demonstration gasification facility in Mykonos and elsewhere plasma

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