Quantitative Analysis of Oolitics by X-Ray Difiractometer

Abstract

  Composition is the most important element in controlling green sand. Oolitics, one of the composition, is quantified by analyzing quartz by the silica program test. However this test takes more than 8 hours and the analyzer needs to spend one hour on this work. To shorten this time, we examined another method to quantify oolitics by using X-ray diffractometric analysis for quartz. We chose the calibration curve method as a quantitative. First, we changed the quartz content by using quartz and feldspar, then measured the diffraction X-ray intensity, and obtained calibration curve between quartz content and diffraction X-ray intensity. As a result of comparing each diffraction X-ray intensity of the first peak (angle of diffraction is 2 θ 26.6°) and the second peak (2 θ 20.9°) with quartz quantity analyzed from the silica program, the quantitative precision from the second peak was found to be better, because there was no other material peaked around 2 θ 20.9° for green sand. Although it takes almost 6 hours to analyze quartz by X-ray diffractometric analysis, the actual working time for the analyzer was shortened less than 30 minutes, and the efficiency improved more than two times compared with the silica program test.