MELTING CRUCIBLE FOR PREPARING GLASS BEAD SAMPLE

PURPOSE:To permit quick vitrification of a sample and flux in a melting furnace of a high-frequency induction heating type or the like by providing a peak- shaped projecting part to the central part at the base of a melting crucible. CONSTITUTION:The peak-shaped projecting part 10 is provided to the central part at the base of the melting crucible 4 in the case of melting and vitrifying the pulverized powder sample with the flux in the melting furnace of the high- frequency induction heating type or the like by using the melting crucible for preparing a glass bead sample to be used in the case of determining the contents, etc. of the constituting elements of slag, iron ore, etc., by a fluorescent X-ray analysis. The melt which rises on the side wall and moves to the central part in the case of mixing and melting the sample by the vertical convection between the side wall and the central part descends in said part and rotates in a manner as to flush away the base without remaining in said part. The lateral oscillating motion of the melting furnace additionally accelerates the mixing and stirring to shorten the time for melting.