| 摘要 |
PURPOSE:To obtain a sludge hardener and a soil conditioning material from slug, by adding 5-30wt% of silicate to high basicity steel making sludge held under a molten state to generate melting reaction while adding gypsum or lime to the reaction mixture before crushing. CONSTITUTION:5-30wt% of one or more of silicate selected from rock, mineral, coal ash, waste brick and waste casting sand is added to high basicity steel making slug held under a molten state to generate melting reaction and the resulting mixture is subjected to water granulation treatment before drying. Subsequently, 3wt% of gypsum or lime is added to the treated sludge to crush the same. When a small amount of an alkali stimultaing agent such as CaO is added to this crushed materil and water is further added thereto to perform kneading, said crushed material becomes hydraulic and, therefore, can be used as a sludge hardener. As additives, Al2O3 or SiO2 may be used alone but it is pref. to add an additive in which a proper amount of SiO2, Al2O3, Fe2O3 or the like are contained because melting temp. is lowered. |
