Abstract: Impurities are removed from pieces of sulfur by dropping the pieces directly into a bath of heated liquid sulfur disposed in a vessel. The liquid sulfur is heated externally of the vessel and conveyed thereto. The sulfur pieces melt in the bath. A movable element, such as a rotary screen drum or conveyor blades for example, is disposed in the bath for agitating the bath and entraining the impurities.

Abstract: A method and apparatus for continuously generating sulphur seed nuclei inside the drum of a sulphur pelletizing system. The sulphur seed nuclei are generated in portions of the drum by elevating the temperature of the solid sulphur particles in the range of about 180.degree. to 230.degree. F. A portion of the sprayed liquid sulphur particles solidify into seed nuclei particles prior to contacting a falling curtain of solid sulphur particles in the area of the spray pattern having a minimum density of the liquid sulphur particles. The generation of seed nuclei may be confined to the feed end of the drum so as to leave the remaining portion of the drum available for product growth.