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More Information
More Information
Several needs should be taken into consideration when selecting the right product for your steelmaking needs:
- Magnesium and calcium balance for combined refractory and slag chemistry.
- Method of introducing dolomitic lime into furnace will determine the size of your grain.
| Process step | Critical parameters | Typical consumption (kg/ton of steel) |
|---|---|---|
| Steelmaking (BOF) | 1. Quality level and consistency 2. Reactivity 3. Lower fines | Dolomitic Quicklime 5-40 |
| Steelmaking (EAF) | 1. Quality level and consistency 2. Lower fines for lump lime 3. Flowability for injection | Dolomitic Quicklime 10-50 |
| Secondary metallurgy: Ladle Refining Furnace (LRF) and Argon Oxygen Decarburization (AOD) | 1. Quality level and consistency 2. Reactivity 3. Low impurities (e.g. S, H2O) 4. Low carbon for AOD | Dolomitic Quicklime 0-5 |
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FAQ
What is dolomitic quicklime (a.k.a. calcium magnesium oxide)?
Also known as dolime, dolo lime, or calcium magnesium oxide is derived from deposits of calcium carbonate combined with magnesium carbonate. The carbonate product is calcined at a high temperature resulting in oxide material containing a high magnesium oxide level and calcium oxide. It is a caustic and alkaline crystalline solid.
What is the difference between dolomitic quicklime and calcitic quicklime?
Dolomitic quicklime and calcitic quicklime can be considered similar products and can have similar applications, such as acting as a fluxing agent in steelmaking process. However, dolomitic lime brings both calcium and magnesium and calcitic lime only calcium. They do have also distinct differences to be considered such as reactivity or softness.
What are the benefits of usage of dolomitic lime?
Dolomitic lime is added to the steelmaking process to increase soluble magnesium oxide in the slag, lowering the tendency of the steelmaking process to react with magnesium from refractories. This can prevent melt throughs and protect the refractory from wearing. In EAF steelmaking, saturation of magnesium in the slag promotes and sustain slag foaminess by acting notably on slag viscosity.