To provide a technology for producing a solidified body of steel-making slag, whereby elusion of fluorine from the slag-solidified body composed mainly of fluorine-containing steel-making slag is suppressed, producing the slag-solidified body having high-strength, and the solidified body of steel-making slag can be converted to a civil engineering material satisfying soil environmental standards, when being recycled after using.
The solidified body of steel-making slag is produced by the followings: using a raw material of the fluorine-containing steel-making slag having elusion pH of ≥11 as the steel-making slag; using further a solidifying agent selected from fine powders of blast furnace slag, cement, and the mixture of the fine powders of blast furnace slag with cement as a raw material; adding phosphoric acid or a phosphate to the mixture of the steel-making slag and the solidifying agent of blast furnace slag; preparing a ready-mixed concrete-like kneaded product by adding water to the resultant mixture; and solidifying whole of the kneaded product in a formwork etc. by curing.
COPYRIGHT: (C)2009,JPO&INPIT
Yuji Toda
Masato Masazawa
Kenji Katagiri
Naoaki Fujiyoshi
Katsumi Matsumoto
Kurita Water Industries Ltd.
| JP2005298267A | ||||
| JP2002331272A |
Masayuki Kishida
Hiroshin Takano