Electric Furnace Magnesia Carbon Brick

Electric Furnace Magnesia Carbon Brick

Magnesia-carbon bricks are made of burnt magnesia (or fused magnesia) and carbon materials (mainly crystallized graphite) as raw materials, using resin as a binder to prepare and press, and heat treatment. In order to improve the oxidation resistance, anti-oxidants such as metals are often added. Magnesia-carbon bricks form a carbon skeleton bond when used at high temperatures.

Since magnesium oxide and carbon do not have a mutual soluble relationship, the excellent fire resistance of the original components is retained. Carbon has good thermal conductivity, low thermal expansion coefficient and low elasticity coefficient, which can effectively prevent high-temperature spalling and slag penetration, and is not prone to structural spalling, which greatly changes the fatal weakness of degraded structure spalling caused by slag penetration of magnesia refractories. Coupled with the non-wetting of carbon to slag, the corrosion resistance is also good. These series of characteristics of magnesia carbon brick make it an ideal lining material with good thermal shock stability, corrosion resistance and spalling resistance.

Magnesia carbon bricks

Brand	MgO （%）≥	C （%）≥	Apparent porosity A.P（%）≤	Bulk density B.D(g/cm3)≥	Compressive strength at room temperature C.C.S MPa≥
MT-10B	77	10	4	3	45
MT-12B	75	12	4	2.95	40
MT-10A	80	10	3.5	3.05	45
MT-12A	77	12	3.5	3	40
MT-14A	75	14	3	2.95	40
MT-16A	72	16	3	2.95	35

Alumina magnesia carbon bricks

Brand	MgO （%）≥	Al2O3 （%）≥	C （%）≥	Apparent porosity A.P（%）≤	Bulk density B.D(g/cm3)≥	Compressive strength at room temperature C.C.S MPa≥
AMT-60	16	57	12	4	2.92	50
AMT-65	17	62	10	4	2.95	50

Type	Magnesia Aluminum Carbon Brick				Magnesia calcium carbon brick
Index grade	MAC60	MAC70	MAC74		MGT5	MGT2	MGT13
MgO（%）≥	55	68	71		70	75	70
Al2O3（%）≥	23	8	6		-	-	-
C（%）≥	8	10	10		5	2	8
CaO（%）≥	-	-	-		-	-	-
B.D(g/cm3) ≥	3	2.9	3		2.9	2.85	3
Apparent porosity AP（%）≤	6	5	5		6	7	5
Compressive strength at room temperature CCS（Mpa）≥	30	35	40		30	30	35

Main applications:

Magnesia-carbon bricks have a wide range of uses, and can be used in key parts of thermal equipment such as steel-making converters, electric arc furnaces, ladles, and out-of-furnace refining furnaces. The aluminum-magnesium-carbon bricks made of high-quality bauxite clinker, fused corundum, and fused magnesia have low thermal conductivity, good thermal insulation, and appropriate residual expansion.

They are used for ladle, lower wall, bottom and free Good materials for the department. The performance of magnesia-aluminum-carbon bricks is between that of magnesia-carbon bricks and aluminum-magnesia-carbon bricks. Magnesia-calcium carbon bricks are made of high-quality magnesia, dolomite sand and synthetic magnesia dolomite sand as raw materials, and anhydrous resin as a binder. Good slag resistance, more stable under high temperature vacuum, and can clean molten steel. It is suitable for VOD furnace, AOD furnace and LF furnace of external scouring device.

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