SURFACE MODIFICATION METHOD FOR BLAST FURNACE SLAG AND MODIFIED BLAST FURNACE SLAG

摘要

PROBLEM TO BE SOLVED: To provide a technique for the efficient modification of blast furnace slag to suppress the alkalization of water by the dissolution of Ca ion in the case of using the slag in an environment in contact with water. SOLUTION: Water granulated or slowly cooled blast furnace slag is brought into contact with a sulfuric acid solution having a sulfuric acid concentration of 250-1,500 mol/m3 to form a gypsum dihydrate layer having a thickness of 30-150 m on the outer surface of the blast furnace slag.