PHOSPHORUS RECOVERING MATERIAL AND ITS PRODUCTION METHOD

PROBLEM TO BE SOLVED: To provide an excellent phosphorus recovering material wherein room temperature curing is short, phosphorus recovering ability is increased, and disruption of granule hardly occurs, and its production method. SOLUTION: The phosphorus recovering material is the granule of calcareous raw material, siliceous raw material and quick hardening material. The granule is subjected to the room temperature curing and autoclave curing. The quick hardening material is selected from among alumina cement, slaked lime and gypsum. The composition of the quick hardening material is 40-60 wt% alumina cement, 30-5 wt% slaked lime, and 30-35 wt% gypsum. The addition ratio of the quick hardening material to the whole calcareous raw material and siliceous raw material is 10-40 wt%. The molar ratio CaO/SiO2of calcium content (CaO) and silica content (SiO2) in the granule is 0.5-1.0. In the production method, the calcareous raw material, siliceous raw material and quick hardening material are mixed, then granulated. The mixed material is subjected to room temperature curing for fifteen minutes to one hour, and autoclave curing. COPYRIGHT: (C)2004,JPO&NCIPI