ZINFON Dead Burnt Magnesia is produced from magnesite sintered in high-temperature vertical kilns. It features a high MgO content ranging from 90% to 93%, serving as a raw material for manufacturing standard magnesia bricks and monolithic refractories.
It is widely applied in various high-temperature kilns for steel, cement and non-ferrous metal smelting industries.
We supply multiple specifications with ready stock and act as a professional refractory material supplier.
Physical and Chemical Indicators
| Item / Grade | DBM92 | DBM91 | DBM90 |
| MgO % ≥ | 92 | 91 | 90 |
| SiO₂ % ≤ | 4.8 | 5 | 5.2 |
| CaO % ≤ | 2.3 | 2.3 | 2.5 |
| Fe₂O₃ % ≤ | 0.8 | 0.8 | 1 |
| Al₂O₃ % ≤ | 0.5 | 0.5 | 0.5 |
| LOI % ≤ | 0.3 | 0.3 | 0.5 |
| B.D. ≥ (g/cm³) | 3.15 | 3.15 | 3.15 |
Size
Custom sizes available upon customer request.
Application
This product is used in the production of magnesia bricks, magnesia-alumina bricks, and magnesia-chrome bricks, as well as in gunning mixes, castables, dry ramming mixes, coating masses, and furnace patching materials. It is also used as an additive in pitch, casting materials, fireproof and thermal insulation materials, and welding fluxes. In industrial furnaces, it is used in steelmaking furnaces, heating furnaces, rotary kilns, electric furnace bottoms, and rammed furnace linings for steelmaking.
Production Process
Specific Production Flow of Dead-Burned Magnesia
Ore + Coal + Coke → Sintering → Discharging → Cooling → Crushing & Sorting → Conveying to Warehouse → Secondary Sorting in the Warehouse → Finished Products
Sintering Process of Dead-Burned Magnesia
The magnesite ore used for dead-burned magnesia generally contains more than 45% MgO, with the total content of Al₂O₃ and SiO₂ being less than 4%. Magnesite (MgCO₃) starts to decompose at 350°C and completes its decomposition at 1000°C.
Vertical kilns with a height of 10–15 meters and a diameter of 3–4 meters are used. Raw materials are fed directly from the top of the kiln, and blowers installed in the middle-lower section supply combustion air into the kiln.
The sintering temperature of dead-burned magnesia is around 1500°C. High-purity magnesite turns off-white gray after calcination. The color of the finished dead-burned magnesia varies depending on the impurities present:
~High SiO₂ content: off-white yellow
~High Fe₂O₃ content: dark brown
~High CaO content: black
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