THEORETICAL CALCULATION OF LOSS ON IGNITION OF CLAY MATERIAL USED IN E-GLASS PRODUCTION

摘要

X-ray fluorescence spectrometer is a powerful analytical tehnique which has many advantages as compared to other methods. Speed of analysis carried out by XRF stands out as a clear advantage that can not be surpassed. Clay is one of the essential raw material used in E-glass production. To pursue chemical compositional stability of clay, as for all the other materials, is extremely important. X-ray fluorescence is most suitable for this purpose. It takes about 20 minutes for an analysis to be completed, including sample preparation. However, the determination of the loss on ignition is carried out by classical methods which takes a period of about 4 hours.It was observed that for clays with an alumina content within the range of 10.8-36.5 %, there is a clear mathematical relationship (r~2 = 0.95 ～0.99) between the oxide contents and the experimental loss on ignition values. Ignition loss values calculated mathematically are drawn against experimental results. It was ascertained that the results are in very good agreement (±0.2 %).Coupling this relationship with the software of the computer programme connected to the spectrometer makes it possible to complete the analysis concurently which takes into account the ignition loss values. It has thus been possible to eliminate the time loss for ignition loss experiments.