$Refractory Bricks$

The Features and Applications of Magnesia Brick

Apr 05,2017
Magnesia brick is a basic refractory product with periclase as its main mineral phase. It contains not less than 91% MgO and not less than 3.0% CaO.
Magnesia brick is composed of 80-90% periclase and 8%-20% other mineral phase including magnesium ferrite (MgO.Fe2O3), forsterite (2MgO.SiO2) and Calcium and magnesium olive stone (CaO.MgO.SiO2).Silicate glass contains about 3-5% magnesium, calcium and iron.
Magnesia brick has good thermal conductivity, good thermal expansion, good corrosion resistance to alkali molten slags and bad corrosion resistance to acid molten slags. Due to the low-melting silicate cements surrounded periclase, the beginning point of the softening temperature under load is not too high, but the collapse temperature is close to the beginning point. Its refractoriness is over 2000 C;, but it does not make sense in the actual use. Bad thermal shock stability is one of the main reasons for the destruction.

In the storage and transport, special attention should be paid to moisture-proof to avoid burst.

magnesia brick

Features:
· Excellent performance of basic slag resistance, thermal stability, anti-erosion, and anti-peeling
· High strength of pressure bending, abrasion proof
· Good performance of high-temperature firing, high rates of associative property, anti-erosion ability
· Excellent thermal shock resistance and spalling resistance
· Excellent ability of high refractoriness, anti-erosion of alkaline residue
· High temperature refractoriness under loading
· High mechanical strength
· High temperature resistance
· Excellent corrosion resistance
· Resistance to spalling
Applications
· Magnesia brick is comprehensively used in checker chamber of glass tank
· Lime kiln
· Non-ferrous metallurgical furnaces
· Open heart furnace
· Iron mixer and EAF of steel-making

· Ferro-alloy furnace

magnesia brick

Physical & Chemical Index:

Brand Item	Index
MgO % ≥	91	95	97	97.5
SiO 2 % ≤	/	/	/	0.5
CaO % ≤	3	1.5	1.5	1.0
Refractoriness under load 0.2MPa ºC ≥	1520	1650	1700	1700
Apparent Porosity % ≤	20	17	18	17
Cold Crushing Strength (MPa) ≥	40	45	45	50
Applications	Cement Rotary Kiln, Lime Shaft Kiln