METHOD OF PURIFYING SUBSTANCE AND APPARATUS FOR PURIFYING SUBSTANCE

摘要

A method of purification which comprises immersing a cooled object in a molten substance and crystallizing the substance on the surface of the cooled object to grow the crystal. While being rotated at a peripheral speed of 700-8,000 mm/s, excluding 8,000 mm/s, the cooled object is lowered and immersed in the molten substance. The temperature of the cooled object in the state of being immersed in the molten substance is regulated to at least [(solidus temperature of the substance)x0.7].