Dead Burned Magnesite (DBM)，also known as Dead Burnt Magnesia, is a critical basic refractory raw material sintered from natural magnesite ore at high temperature of 1650‑1750 ℃ in shaft kilns or rotary kilns.High‑temperature calcination decomposes magnesium carbonate into dense and stable periclase (MgO) crystals.
Key Features：
- Fully sintered at 1650–1750℃, forms well‑developed dense periclase crystals.
- Extremely low hydration reactivity, resistant to moisture absorption and stable for long‑term storage, different from caustic calcined magnesia.
- High refractoriness with melting point at 2852℃, excellent high‑temperature volume stability and minimal thermal shrinkage.
- Good resistance to basic slag corrosion, serving as core raw material for basic refractory products.
- High hot strength and high load softening temperature, suitable for long‑term high‑temperature service in metallurgical kilns.
- Stable chemical property and alkali resistance, with better cost performance than electro‑fused magnesia.
- Available in various granular and powder sizes for manufacturing refractory bricks and monolithic refractories.
Available Grades：
DBM‑90, DBM‑92, DBM‑95, DBM‑96,DBM‑97, DBM‑97.5, DBM‑98
Main Applications:
‑ Raw material for magnesia carbon bricks, magnesia bricks and other shaped basic refractory products.
‑ Aggregate for magnesia‑based monolithic refractories: castables, ramming masses, gunning mixes.
‑ Widely used for EAF, steel ladle slag line, cement rotary kilns and non‑ferrous metallurgy furnaces.
Available Sizes & Packing：
Standard sizes:0‑1mm,1‑3mm,3‑5mm,5‑8mm,8‑15mm and fine powder.Sizes can be customized upon request.
Packing: 1/1.25 MT ton bags, 25 kg bags or on request.
COA certificate provided per batch.
Specification:
Chemical Composition | DBM90 | DBM92 | DBM95 | DBM96 | DBM97 | DBM975 | DBM98 |
MgO | 90%min | 92%min | 95%min | 96%min | 97%min | 97.5%min | 98%min |
SiO2 | 4.8%max | 4%max | 2%max | 1.5%max | 0.75%max | 0.55%max | 0.4%max |
CaO | 3.0%max | 2.0%max | 2.0%max | 2.0%max | 1.5%max | 1.1%max | 0.9%max |
Fe2O3+Al2O3 | 3.5%max | 2.7%max | 1.5%max | 1.0%max | 0.5%max | 0.4%max | 0.35%max |
LOI | 0.8%max | 0.8%max | 0.5%max | 0.3%max | 0.3%max | 0.2%max | 0.2%max |
Bulk Density | 3.1g/cm³min | 3.14g/cm³min | 3.18g/cm³min | 3.2g/cm³min | 3.25g/cm³min | 3.27g/cm³min | 3.3g/cm³min |
*Specifications and Sizes can be customized upon request.
Available Sizes & Packing：
Standard sizes:0‑1mm,1‑3mm,3‑5mm,5‑8mm,8‑15mm and fine powder.Sizes can be customized upon request.
Packing: 1/1.25 MT ton bags, 25 kg bags or on request.
COA certificate provided per batch.