Magnesium-chrome bricks are made of high purity magnesia, chromium ore or magnesium-chrome sand as raw materials, and sintered at high temperature according to different combination methods.
Magnesium-chrome bricks have excellent slag erosion resistance, high temperature overheating damage resistance, vacuum damage resistance, oxidation reduction resistance, abrasion and erosion resistance.
Magnesium-chrome bricks are widely used in cement kiln lining, metal smelting furnace of the key parts, RH or DH vacuum degassed furnace, VOD, ladle, AOD, ultra high power electric arc furnace, large non-ferrous metal smelting furnace (flash furnace, converter, anode furnace, etc.) working lining, hot spot area, slag line area, wind-eye area, scour area and other vulnerable areas.
The physical and chemical properties and functional performance of magnesium-chrome bricks can be greatly improved after salt leaching treatment. After salt leaching, the product’s porosity is reduced by about 5.0%, the bulk density is increased by about 0.05g/cm3, and the compressive strength is increased by about 30MPa. According to the different raw materials used, magnesium-chrome bricks series products are divided into three categories: rebonded magnesium-chromebricks (RBTRMC), directly bonded magnesium-chrome bricks (RBTDMC) and semi-rebonded magnesium-chrome bricks (RBTSRMC).
| INDEX | MgO
（%） ≥ |
Cr2O3
（%） ≥ |
SiO2
（%）≤ |
Apparent Porosity（%）
≤ |
Bulk Density（g/cm3）≥ | Cold Crushing Strength（MPa）
≥ |
Refractoriness Under Load（℃）0.2MPa ≥ | Thermal Shock Resistance 1100° water cool（times） | |
| Ordinary magnesium-chrome brick | RBTMC-8 | 65 | 8~10 | 6 | 20 | 2.95 | 35 | 1600 | 3 |
| RBTMC-12 | 60 | 12~14 | 4.5 | 20 | 3.0 | 35 | 1600 | 3 | |
| RBTMC-16 | 55 | 16~18 | 3.5 | 18 | 3.05 | 45 | 1700 | 4 | |
| Direct bonded magnesia chrome bricks | RBTDMC-8 | 78 | 8~11 | 2.0 | 18 | 3.05 | 45 | 1680 | 6 |
| RBTDMC-12 | 72 | 12~15 | 1.8 | 18 | 3.10 | 45 | 1700 | 5 | |
| RBTDMC-16 | 62 | 16~19 | 1.8 | 18 | 3.10 | 45 | 1700 | 5 | |
| Semi-recombined magnesia chrome bricks | RBTSRMC-16 | 62 | 16~18 | 1.7 | 17 | 3.15 | 50 | 1700 | 6 |
| RBTSRMC-20 | 58 | 20~22 | 1.5 | 16 | 3.15 | 45 | 1700 | 5 | |
| RBTSRMC-24 | 53 | 24~26 | 1.5 | 16 | 3.20 | 45 | 1700 | 5 | |
| RBTSRMC-26 | 50 | 26~28 | 1.5 | 16 | 3.20 | 45 | 1700 | 5 | |
| Recombined magnesia chrome bricks | RBTRMC-16 | 65 | 16~19 | 1.5 | 16 | 3.20 | 55 | 1700 | 5 |
| RBTRMC-20 | 60 | 20~23 | 1.2 | 16 | 3.25 | 60 | 1700 | 5 | |
| RBTRMC-24 | 55 | 24~27 | 1.5 | 16 | 3.20 | 60 | 1700 | 5 | |
| RBTRMC-28 | 50 | 28~31 | 1.5 | 17 | 3.26 | 60 | 1700 | 4 | |