Home Brick for Glass Furnace Regenerator Magnesia Brick for Glass Furnace Regenerator

Magnesia Brick for Glass Furnace Regenerator

Properties of Magnesia Brick for Glass Furnace Regenerator

Magnesia Brick for Glass Furnace Regenerator (GMZ) made of different types of pure magnesite, processed by medium to high temperature sintering. With excellent resistance to strong alkaline vapour erosion, oxidation-reduction erosion and good thermal conductivity. They are applied as checker Bricks and Wall Bricks at middle & upper part of Glass Furnaces Regenerators

The raw material of magnesia brick is mainly magnesite, and its basic component is MgCO3.
Magnesia Brick for Glass Furnace Regenerator is an alkaline refractory material, which has strong resistance to alkaline slag, but cannot resist the erosion of acid slag. At 1600°C, it can react with Silica Brick, Clay Brick and even High Alumina Brick. The refractories of Magnesia Brick is above 2000°C, but its Refractories under Load (RUL) point is only 1500~1550°C. And the temperature interval from softening to 40% deformation is very small, only 30~50°C. The Thermal Shock Resistance of Magnesia Brick is also poor, which is an important reason for the damage of Magnesia Brick.


When the liquid phase appears in the brick under high temperature, it will suddenly shrink. The thermal conductivity of Magnesia Brick is high, which is second only to Carbon Brick and Silicon Carbide Brick in refractory products. It decreases with the increase of temperature.

The thermal shock resistance of Magnesia Brick is poor. Improving the purity of Magnesia Brick can appropriately improve the thermal shock resistance.
Magnesia Brick for Glass Furnace Regenerator 1

Production of Magnesia Brick for Glass Furnace Regenerator

Various grades of dead-burned magnesite are available for the production of Magnesite Brick. They range from natural dead-burned materials, with MgO contents of 90% or less, to high purity synthetic magnesites containing 96% MgO or greater.

A large amount of work has been done to produce highly refractory magnesites. Since magnesia itself has an extremely high melting point, i.e., 5070°F (2800°C), the ultimate refractoriness of a Magnesite Brick is often determined by the amount and type of impurity within the grain. In practice, the refractoriness of a dead burned magnesite is improved by lowering the amount of impurities, adjusting the chemistry of the impurities or both.

Classification of Magnesia Brick for Glass Furnace Regenerator

There are many types of magnesite refractories, both burned and chemically bonded. For simplification, they can be divided into two categories on the basis of chemistry. The first category consists of brick made with low boron magnesites, generally less than 0.02% boron oxide, that have limeto-silica ratios of two to one or greater. Often, the lime-to-silica ratio of these brick is intentionally adjusted to a molar ratio of two to one to create a dicalcium silicate bond that gives the brick high hot strength. Brick with lime-to-silica ratios greater than two to one are often of higher purity than the dicalcium silicate-bonded brick. This greater chemical purity makes them more desirable for certain applications. 

The second category of Magnesite Brick generally has lime-to-silica ratios between zero and one, on a molar basis.

These bricks may contain relatively high boron oxide contents (greater than 0.1% B2O3) in order to impart good hydration resistance. Sometimes, for economic reasons, these bricks are made with lower purity natural dead burned magnesites with magnesia contents of 95% or less. At other times, the brick are made with very pure magnesites with MgO contents greater than 98% for better refractoriness.

%E4%B8%8B%E8%BD%BD We can produce Harbinson Walker International standard Magnesia Brick for Glass Furnace Regenerator

rhimagnesita We can produce RHI Magnesita standard Magnesia Brick for Glass Furnace Regenerator

Refrateknik1 We can produce Refratechnik standard Magnesia Brick for Glass Furnace Regenerator

 

OSYMEN

MgO

SiO2

CaO

A.P

B.D

CCS

RUL

%

%

%

%

g/cm3

MPa

(Ta)°C

GMZ-91

91.0

3.0

2.0

15

2.90

70

1550

GMZ-93

93.0

2.0

2.0

15

2.93

70

1580

GMZ-95A

95.0

1.5

1.5

15

2.95

75

1650

GMZ-95B

95.0

1.5

1.5

16

2.92

70

1620

GMZ-96A

96.2

1.0

1.5

15

2.96

75

1680

GMZ-96B

96.0

1.2

1.5

16

2.93

70

1650

GMZ-97A

97.1

0.8

1.2

15

3.00

80

1700

GMZ-97B

97.0

0.8

1.2

16

2.97

75

1680

GMZ-98A

97.6

0.6

1.2

14

3.10

85

1700

GMZ-98B

97.4

0.6

1.2

15

2.98

80

1700

AP: Apparent Porosity   |  BD: Bulk Density  |  CCS: Cold Crushing Strength  |  RUL: Refractories Under Load  |  TSR: Thermal Shock Resistance  |  TE: Thermal Expansion

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Last updated: 2024-01-03
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