| 摘要 |
<p>PROBLEM TO BE SOLVED: To recycle sludge whose recycling is conventionally considered to be difficult to perform, as a safe and stable material such as material of a concrete product or material for land reclamation by utilizing properties of Pearlgreen(R) and clinker ash in the production process of thermal cement. SOLUTION: The production process of this thermal cement comprises mixing sludge with Pearlgreen(R), clinker ash and cement to form a cement mix and granulating the cement mix, wherein more concretely: (a) the sludge is mixed with Pearlgreen(R) that is incineration ash, and the resulting mixture is dried and, after the drying, the dried mixture is mixed with cement, clinker ash and a solidifying agent to form a cement mix and the cement mix is granulated into a granulated material, i.e., granular concrete; (b) in the production process of a concrete product, the granulated material is mixed with pottery debris and the resulting mixture is crushed into a crushed material, and by using the crushed material as a substitute for sand, a concrete product having sufficient strength can be produced, and also similarly, by using clinker ash as a component of the cement mix, a concrete product having increased strength can be produced; and further, (c) by mixing sludge with Pearlgreen(R) in the above drying stage, malodorous substances, organic matter and harmful substances can be removed from the sludge.</p> |
