METHOD FOR TREATING AIR-COOLED BLAST FURNACE SLAG, TREATMENT DEVICE THEREFOR, AND METHOD FOR PRODUCING ROADBED MATERIAL, AGGREGATE, MATERIAL FOR EARTHWORK AND GROUND IMPROVING MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a method for treating air-cooled blast furnace slag which can make air-cooled blast furnace slag into utilizable material in a short time while reducing the generation of harmful substances, and a treatment device therefor.SOLUTION: The method for treating air-cooled blast furnace slag includes: an extraction step (steps S101 to 103) of, after the storage of air-cooled blast furnace slag and water into a pressure resistant vessel, warming the pressure resistant sealed container to make the stored water into high temperature-high pressure water of 150 to 300°C, and, by the contact between the produced high temperature-high pressure water with the air-cooled blast furnace slag, extracting a sulfur component in the air-cooled blast furnace slag into the high temperature-high pressure water; and an exhaust step (step S104) of, after the completion of the extraction step, exhausting the high temperature-high pressure water in the pressure resistant vessel.