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Quicklime is an important active product in eliminating
silicon and phosphorus. The lime combines with these impurities to form
a basic slag. Lime quality is essential in producing a high quality slag
which is easy to handle and treat, as well as being environmentally friendly.
It is also common practice to add soft- and hard-burned dolomite, either
in its pure form or in a lime-dolime mix, as they are beneficial to the
steel refining process. Indeed, dolime makes slag formation quicker which,
in turn, makes foaming swifter and speeds up this stage of the process.
Calcined dolomite also extends the lifespan of refractory linings in
converters, protecting them from the aggressive effect of certain impurities
present in the hot metal. In fact, adding dolime will create MgO in solution
in the slag, which provides an excellent buffering capacity as MgO particles
in suspension provide excellent coating protection. Any excess MgO precipitates,
protecting refractories and tap holes, reducing the need for gunning and
repairs.
Converter fumes containing dust are usually washed. The sludge resulting
from the settling of these wash waters can be treated with lime to recycle
them in the form of briquettes for the sinter plant, as the additional
calcium adds value to the sintering process.
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