Method for producing cement clinker using stainless steel slag: Fid-Bau Portal

Method for producing cement clinker using stainless steel slag

CELIS SERGE / VAN MECHELEN DIRK

In a method for manufacturing a cement clinker, a feedstock comprising at least one stainless steel slag is calcined and combusted to produce the cement clinker. The cement clinker can only contain a limited amount of hexavalent chromium, so that the chromium content of the stainless steel slag needs to be limited. This is achieved by solidifying the liquid steel slag such that it comprises a small amount of fine powder sufficient. The fines produced when these fines and/or the coarser fraction of the pulverized steel slag are used to recover stainless steel are used as powdered stainless steel slag for the manufacture of cement clinker. It has been found that these fines have a chromium content that is indeed much less than sand and a coarser coagulation fraction produced from solidified stainless steel slag. The stainless steel slag partially replaces a traditional lime source, carbon dioxide emission can be reduced, and the energy requirement of the cement kiln is lowered. And the powdery stainless steel slag does not need to be finely ground and melted immediately in the rotary kiln.

在用于制造水泥熟料的方法中，对包括至少一种不锈钢渣料的原料进行煅烧和燃烧以生产所述水泥熟料。由于水泥熟料可以只包含限定量的六价铬，因此，需要限制不锈钢渣料的铬含量。这是通过使液体钢渣凝固以使其包括足够少量的细粉来实现的。这些细粉和/或粉碎钢渣的较粗级分以回收不锈钢时产生的细粉用作用于制造水泥熟料的粉末状不锈钢渣料。已发现，这些细粉的铬含量确实比砂和由凝固化不锈钢渣生产的较粗的混凝料级分少得多。通过不锈钢渣料部分替代传统石灰源，能够减少二氧化碳排放并且降低水泥窑的能量需求。粉末状不锈钢渣料也不需要在回转窑中立即精细研磨和熔融。

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