LD-slag
LD-slag is the second largest product after BF-slag. The volume is about 160.000 Mt./year at Oxelösund. The product name is LD-Stone. (BOF slag)
LD-slag comes from slag-formers such as burned lime/ dolomite and from oxidising of silica, iron and others when refining the iron into steel in the LD-Furnace.
Comparing with Hyttsten (ABS Air cold blast furnace slag)
| Main contet |
Formula |
LD-stone |
Hyttsten |
| Lime |
CaO |
45% |
32% |
| Silica |
SiO2 |
12% |
34% |
| Aluminium oxide |
Al2O3 |
2% |
12% |
| Magnesium oxide |
MgO |
8% |
18% |
| Iron oxide |
FeO |
24% |
0,50% |
| Manganese oxide |
MnO |
4% |
0,50% |
| Sulphur |
S |
0,1% |
1,50% |
Use of LD-stone:
LD-Stone is used as a slag-former in the Blast-Furnace. It’s also used as rawmaterials in mineral-wool plants and for manufacturing of cement.
LD-slag may not be used for road building because of it’s physical and chemical instability.
