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.

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 BF-stone

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.