Magnesia Alumina Bricks for Tunnel Kiln

Magnesia Alumina Bricks for Tunnel Kiln Introduction
 
Magnesia alumina refractory bricks use magnesia as the main raw material, magnesia brick and aluminum oxide as the co-milled fine powder as the matrix, the alkaline products which are fired at high temperature are called magnesia alumina bricks.
 
Magnesia alumina refractory bricks have good thermal shock resistance, high mechanical strength at high temperatures and high softening temperatures.
 
Magnesia alumina fire brick has good slag resistance, high temperature performance and thermal stability, the price is cheaper than magnesium spinel refractory bricks.
 
Magnesia Alumina Bricks for Tunnel Kiln Features
 
*Magnesia alumina bricks has good slag resistance
 
*Magnesia alumina bricks has good thermal shock resistance
 
*Magnesia alumina bricks has high load softening temperature
 
*Magnesia alumina bricks has high temperature mechanical strength
 
*Magnesia alumina bricks has high temperature performance & thermal stability
 
Magnesia Alumina Bricks for Tunnel Kiln Specification
 

Index Item		RS-A	RS-80	RS-85	RS-88
MgO	%	86	85	88	90
Al2O3	%	5	7	6.5	6.5
SiO2	%	3.2	4	2.4	1.2
CaO	%	1.6	1.5	1.3	1.2
Fe2O3	%	3.7	1.7	1.4	1.0
Apparent Porosity	%	16~20	17	17	17
Density Bulk	g/cm3	2.85~3.0	2.93	2.93	2.94
Cold Crushing Strength	Mpa	41	50	50	55
0.2Mpa Under Load Refractoriness	℃	≥ 1550	1610	1650	1700
Thermal Shock Resistance(1100℃,water,quenching, cycle)		3~6	3~6	3~6	3~6

 
Magnesium Aluminium Bricks for Tunnel Kiln Manufacturing Process
 
1.The production process of magnesia alumina bricks is roughly the same as that of calcined magnesia bricks, except that a certain proportion of industrial alumina or extra-grade bauxite clinker is added to the ingredients.
 
2.Industrial alumina has a lower impurity content than high alumina bauxite. The addition of natural bauxite clinker to the ingredients can improve the plasticity of the mud. Under the same conditions, the bulk density of the magnesia alumina bricks is higher. Industrial alumina is generally added in an amount of 5% to 10%, refractory magnesia alumina is usually finely ground with magnesia in a certain proportion, and then added as a fine powder, which is advantageous for forming a uniform distribution of the magnesia alumina spinel refractory new crystal phase in the matrix of the product.
 
3.There are also production methods using pre-synthesized magnesia alumina spinel refractory bricks for batching bricks. The critical particle size during the batching is beneficial to improve the thermal shock resistance of the product, but magnesia alumina refractory bricks are not conducive to the density and strength of the product, and generally adopts 3 mm.
 
4.The particle size is generally 3 to 1 mm and 1 to 0.088 mm the ratio of 3 to 2 mm coarse particles to less than 0.088 mm fine powder should be controlled to improve the thermal shock resistance of the refractory product. The firing temperature of the magnesia alumina fire brick is determined according to the purity of the raw material, generally 30 to 50 ℃ higher than the firing temperature of the magnesium brick, and the firing temperature of the high purity magnesium aluminum brick is 1750 to 1800℃.

Magnesia Alumina Brick Supplier in RS Refractory Factory