Importance

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Abstract

A drop tube type granulated crystal manufacturing device (1) for making a nearly spherical crystalline substance by instant solidification as the solidification trigger by impacting the inner wall surface of a drop tube while a granular droplet made of an inorganic material is discharged from a nozzle of a rotary crucible by the centrifugal force and allowed to free fall inside the drop tube, has been disclosed. The crucible (12) is provided at the upper end of the drop tube (4) and which holds melt of inorganic material and is capable of rotating around a vertical centeral axis, and a plurality of nozzles (23) of a small diameter formed in a radial pattern relative to the vertical centeral axis, is formed at the periphery of the crucible (12). The crucible (12) is rotatively driven by the rotary drive means (13), and the crucible (12) and inorganic material held in the crucible (12) is heated by a heating means (15) and a cooling gas flow is formed inside the drop tube (4) by the gas flow formation means (5).

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First Claim