Effect Of Microwave Heat Treatment On The Structure Of Slag Glass-ceramics Containing Slag From Chromium Metal

In this paper,pyroxene phase glass ceramics with low cost,acid and alkali resistance and excellent physical and chemical properties were prepared from slag.The composition of the slag glass ceramics is mainly composed of crystalline phase and amorphous phase.Using slag to make glass ceramics can effectively recycle solid waste and make solid waste a kind of industrial raw material to be used.In the past,the research on the rapid growth of crystal and enhancement of structural and performance was carried out in the research of glass-ceramics by microwave heating.Raman spectroscopy can accurately show the changes in the silicon-oxygen network and alkali metal ions during the preparation of glass-ceramics.And through these changes,the nucleation mechanism of glass-ceramics and the role of basic metal ions in the preparation process can be obtained.Amorphous research is mainly focused on glass networks.The effect of non-thermal microwave effect on glass network and metal ions is studied by using Raman spectroscopy,and the relationship between non-thermal microwave effect and crystal growth is discussed.The microwave heat treatment method can effectively save heat treatment time,save energy consumption in the heat treatment process,and reduce production costs.The microwave non-thermal effects were studied using differential thermal analyzer(DTA),X-ray diffractometer(XRD),field emission scanning electron microscope(FEGSEM),energy dispersive X-ray spectrometer(EDS)and Vickers hardness tester Influence on the crystal phase composition,microstructure and hardness properties of CaO-MgO-Al2O3-SiO2(CMAS)slag glass-ceramics containing chromium slag.Using Raman spectroscopy as the main tool,the influence of microwave non-thermal effects on the diffusion of metal ions during the preparation of glass-ceramics by microwave heat treatment to the depolymerization of the glass network was studied.The role played by the formation and growth of crystals provides a theoretical basis.The results showed thatThe slag glass-ceramics containing slag from chromium metal was successfully prepared in a short time by microwave heating.The main crystal phase is the same as the conventional sample,both of which are diopside phases.The glass-ceramic sample by microwave heating has a similar microstructure to the fully crystallized coventional sample,but the microwave sample has larger and denser crystals.The peak position of Q1-Q4 in the range of 800～1200 cm-1 is blue shift compared with the conventional sample,the half-height width is relatively narrowed,and the content of Q4 is relatively less.The non-thermal microwave effect enhances the diffusion of chromium iron and other metal ions in the glass network during the heat treatment process of the glass-ceramics,causing it to aggregate and precipitate out,and promote the breaking of bridge oxygen bonds to a more serious extent.In the nucleation stage of glass-ceramics,the Raman spectroscopy detection of conventional samples and microwave samples also found the same trend.The peak position of Q1-Q4 in the range of 800～1200 cm-1 for the nucleated glass-ceramic sample is blue shift relative to the conventional sample,and the half-height width is relatively narrow.During the nucleation stage of glass-ceramics,the non-thermal microwave effect destroys the bridging oxygen bonds in the glass network structure by enhancing the diffusion of metal ions such as chromium and iron,thereby causing depolymerization of the glass network and prompting metal ions to aggregate and precipitate a large number of crystals.