الفهرس | Only 14 pages are availabe for public view |
Abstract The present work aims to fabricate colored pigment materials (spinels) from recycling fly ash pollutants. Using a chemical treatment method, alpha alumina was extracted from fly ash and characterized using differential thermal analysis, thermogravimetry, X-ray diffraction analysis, transmission electron microscopy, and Fourier transform infrared spectroscopy. Different transition metals, Cr3+, Mg2+, and Zn2+, were used to prepare the metal cobalt aluminate spinel pigment structures, CrCoAlO4, Mg0.8Co0.2Al2O4, and Co0.5Zn0.5Al2O4, respectively and Zn2+, Cu2+, Fe3+ were used to prepare the metal zinc aluminate and Copper aluminate spinel pigment structures, (ZnAl2O4, FeZnAlO4, CuAl2O4, and Zn0.5Cu0.5Al2O4). The influence of the sintering and fired temperature on the structure and surface morphology of the obtained spinels was investigated. Porosity, density, diffuse reflectance spectroscopy, scanning electron microscopy, and electrical and magnetic properties were determined. The results show that at 1500 ºC, the spinels physicmechanical, magnetic and electrical properties improve. The addition of transition metal ions (Cr3+, Mg2+, Cu2+, Fe3+, Co2+ and Zn2+) to the tetrahedral or octahedral sites of the CoAl2O4, ZnAl2O4 and CuAl2O4 structure is responsible for producing colored spinel structures can be used in ceramic and pigment applications. |