Character And Utilization Study Of Gangue-Combustion Fly Ash From Power Plants Of Xinwen Mining Group

Focus on the fly ash from Xinwen Mining Group, this research make analyses of chemical ingredients, appearance character and mineral components on the samples with chemical analysis, scanning electronic microscope, X-ray diffraction and other methods. Based on the analyses, a new way of comprehensive utilization of fly ash from gangue-combustion power plants is put forward: Aluminum and iron are firstly extracted, and then glass-ceramics with the residue after extracting as raw material will be produced.Aluminum and iron are extracted and separated in a way named one-step acid lixiviation and two-step deposition. The experiment results indicate that with sodium fluoride silicon, 12 % (Wt%) of the fly ash, as lixiviation -supporting matters, alumina and ferric oxide are extracted 63.2% and 72.1% respectively, after the milled fly ash reacts with boiling 9mol/L vitriol for 1.5 hours.With the residue after extracting aluminum and iron as raw material, the melting temperature is lowered to 1250°C by adding some oxides. The crystallization process is carried out with integrated crystallization and even-temperature heat treatment. Crystals in different temperature is observed by SEM; X-ray diffraction indicates that the main crystal phase is olivine; the SEM and XRD data show that the best crystallization temperature is 850°C;the product is compact and has a stone-like outlook with red dots dispersed in light yellow background; compared with the glass-ceramics made from original fly ash, product in the research is much improved in color. All the data show that the method of improving product's outlook by producing particular main crystal phase is available.