| 摘要 |
The invention relates to a method for rendering inert fly ashes, occurring in a waste incineration plant, whereby said ashes are mixed with a silicate material and heated to a temperature of at least 700°C, characterised in that a) in a two-stage method 40 to 60 wt. % fly ashes are milled with 10 to 20 wt. % of a dry additive (I), based on an alkali-rich, silicate-forming or silicate material and the base mass thus obtained blended with 30 to 40 wt. % of an additive (II), based on a mineral acid, to give a homogeneous granular mass, b) said granular mass is transformed into a green granulate, c) in a possible intermediate step the green granulate particles are dusted on the surface thereof with the first additive (I), d) removal of water from the green granulate particles is then carried out at elevated temperatures, e) the dried granulate particles are heated to 950°C to form a glass-melt-like matrix phase, which renders the fly ash particles inert, then finally f) cooling the granulate thus obtained. |
