ELUTION PREVENTING MATERIAL OF HEAVY METAL FROM HARDENED BODY, AND HARDENED BODY

摘要

PROBLEM TO BE SOLVED: To change heavy metal ions, especially Pb into insoluble to prevent elution, and to effectively use molten slag by compounding an alkaline stimulating material into a blast furnace slag powder containing sulfur. SOLUTION: An alkaline stimulating material selected from compds. expressed by M<1> OH or M<1> CO3 (M<1> is an alkali metal such as Li, Na, K), M<2> (OH)2 (M<2> is an alkaline earth metal such as Ca, Mg), alkali metal salts of weak acids and alkaline earth metal salts of weak acids is compounded into a blast furnace slag powder having >=1500 cm<2> /g Brain specific surface area, preferably >=3000 cm<2> /g, and >=0.1 wt.% sulfur content to obtain an elution preventing material of heavy metal ions. The alkaline stimulating material is compounded by 0.1 to 100 pts.wt. into 100 pts.wt. of a mixture of molten slag having >=1500 cm<2> /g Brain specific surface area, preferably >=3000 cm<2> /g, and the blast furnace slag above to prepare a compsn. Then water is added and mixed to the obtd. compsn., which is then hardened by ageing.