Dolomite lumps are naturally occurring rocks composed mainly of the mineral dolomite (CaMg(CO₃)₂). They are larger, coarse pieces, typically ranging from 10 mm to 50 mm, obtained from mining and crushing processes. Dolomite lumps are widely used in the steel industry as a flux to remove impurities during ironmaking, in the production of refractory bricks, and in construction and chemical industries. Their high calcium and magnesium content makes them valuable for neutralizing acidic materials and improving slag quality.
| Parameter | Result (%) | Test Standard |
|---|---|---|
| Calcium Oxide (CaO) | 30.5 % | IS 1239 |
| Magnesium Oxide (MgO) | 20.8 % | IS 1239 |
| Calcium Carbonate (CaCO₃) | 74.2 % | By Calculation |
| Magnesium Carbonate (MgCO₃) | 31.6 % | By Calculation |
| Silica (SiO₂) | 0.5 % | IS 1239 |
| Iron Oxide (Fe₂O₃) | 0.3 % | IS 1239 |
| Aluminium Oxide (Al₂O₃) | 0.2 % | IS 1239 |
| Sulphur (SO₃) | 0.02 % | Instrumental Method |
| Phosphorus Pentoxide (P₂O₅) | 0.01 % | ASTM C1301 |
| Shatter Index (+10 mm) | 95.4 % | IS 9963 |
| Decrepitation Index (−10 mm) | 3.1 % | IS 10345 |
| Moisture | 0.12 % | IS 1209 |
