| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a for making a flying ash harmless in which at the time of incinerating waste material of a municipal waste, etc., a Ca compound contained in an incinerated alkaline flying ash produced by cleaning treatment of waste gas is effectively used at a low cost. SOLUTION: The waste-incinerated flying ash 3 containing >=10wt.% calcium hydroxide is put into the bottom part of a molten iron ladle 1. Thereafter, molten iron 2 is supplied into the molten iron ladle to melt the waste-incinerated flying ash, and desulfurization of the molten iron is executed with the waste- incinerated flying ash and also, heavy metals in the waste-incinerated flying ash are vaporized and separated. At this time, it is desirable to put solid iron source 4 on the waste-incinerated flying ash and blend desulfurizing promoter into the waste-incinerated flying ash.</p> |
