抄録
In the control of green sand by oolitics, it is necessary to quantify oolitics accurately. For this, the quantity of quartz in green sand is quantified first, then oolitics is quantified after calibrating the base sand which is silica sand for calibration and for core used in green sand. However, since certain kinds of base sand are used in recent green sand, calibration and consequently the quantification of oolitics are not possible. The authors therefore developed a new method for quantifing oolitics. Feldspar and quartz are analyzed quantitavely at the same time by X-ray diffractometric analysis by reason of which base sand is quantitatively calibrated for the purpose of calibrating feldspar in silica sand. Quartz is calculated from the integrated intensity of the diffraction peak 20.9° and feldspar is calculated from the sum of each diffraction peak from 26.9° to 28.0°. The oolitics quantity in green sand can be calculated accurately by this method. The average value of oolitics in 67 different kinds of system sand was 6.9 mass% and the standard deflection was 3.7 mass%. The accurate quantification of oolitics enables control of green sand.
