The Role of Infrared Spectroscopy and X-Ray Diffraction Analysis in the Investigation of the Influence of Fluorides on the Process of Calcination of Aluminium Hydroxide |
| |
| Authors: | Stojan R Stojković Živan D Živkovid Nada D Štrbac Ivana S G StojkoviĆ |
| |
| Institution: | University in Belgrade, Technical Faculty at Bor , Bor, Yugoslavia |
| |
| Abstract: | The aim of this work was to check the possibility that by use of infrared spectroscopy the influence of fluorides on the calcinations process of aluminum hydroxide can be followed. The DTA method shows it clearly. It was, namely, found that the added fluoride influences the process of polymorphous transformation of the formation of α-Al2O3 from Al(OH)3. According to DTA, IR, and X-ray analyses, it was found that the added fluoride lowers the temperature of the mentioned transformation for some 300 degrees. For this purpose recorded were IR spectra and X-ray difractograms of pure AI(OH)3 as well as of such samples with added fluoride, in this case of AlF3, in the range of 0. 1 to 10 per cent. The samples were examined in the temperature range of 298 to 1673 K in different time intervals. |
| |
| Keywords: | Ir spectrophotometry X-ray diffraction aluminium fluorides calcination aluminium hydroxide alumina |
|
|
