| 摘要 |
<p>PROBLEM TO BE SOLVED: To keep strength without disintegration even after curing in the air over a long term and also, without requiring a means for preventing water splashing by adding fine powder containing Fe and FeO and water to dust containing a large quantity of Na2 CO3 and mixing and agglomerating. SOLUTION: Wet dust in steelmaking is regulated to have <= about 20% moisture by wing a thickener 1 and a filter press to obtain iron containing fine powder having >=70 wt.% Fe and FeO. This iron-containing fine powder is added to alkali-containing dust having >=20% Na2 CO3 produced in an iron work, or the like, and supplied from a storing tank 4, and mixed in a kneader 3 by adding water. The quantity of this iron-containing fine powder to be added is preferably 20-80 wt.%, while water is added so as to be preferably 0.7-1.5 wt.% to Na2 CO3 . This kneaded material is charged into an extrusion forming machine 5 and the obtd. columnar agglomeration A is cured in the air for a prescribed time so as to be reused as a material having a high strength to crushing.</p> |
