Home Brick for Cement/Lime Kiln Magnesia Spinel Brick for Cement/Lime Kiln

Magnesia Spinel Brick for Cement/Lime Kiln

Magnesia Spinel Brick for Cement/Lime Kiln (MS) made of magnesia and synthetic spinel, processed by high temperature sintering. MA Brick are most extensively, most mature and most economical bricks used in the world for cement rotary kiln transition zone under any condition.

It has many characteristics such as excellent resistance to thermal shock, thermal load damage, and chemical corrosion, overheat fatigue, oxidation reduction and wearing as well as high temperature mechanical flexibility. However, it is not good in clinker coating and high in thermal conductivity. So, we recommend it as the first choice for rotary kiln transition zone bricks.

Magnesia Spinel Brick have been more broadly used in recent years. The term “spinel” as used in describing this type of brick refers to the mineral MgO•AI2O3. In discussing magnesite chrome brick and chrome ores, the term “spinel” is often used to refer to the family of minerals that crystallize in the cubic system and have the general formula RO•R2O3, where RO may be MgO, and FeO and R2O3 may be Fe2O3, Al2O3 and Cr2O3. While usage of the term “spinel” in this broader sense is accepted practice, the mineral spinel has the chemical formula MgO•Al2O3. It has become accepted usage to use the term Magnesite-spinel Brick to refer to the products containing MgO•Al2O3. 

A family of Magnesia Spinel Brick has been developed by combining the constituent raw materials in various ways. Some Magnesia Spinel Brick are made by adding fine alumina to compositions composed mainly of magnesia. On firing, the fine alumina reacts with the fine magnesia in the matrix of the brick to form an in situ spinel bond. An alternative is to add spinel grain to a composition containing magnesia.

One of the principal benefits of combining spinel and magnesia is that the resulting compositions have better spalling resistance than brick made solely with dead burned magnesite. This feature results in the avoidance or inhibition of peel spalling caused by temperature cycling and infiltration of constituents from the service environment. Spinel additions also lower the thermal expansion coefficients of magnesite compositions. This can reduce thermal stresses that could contribute to cracking in certain environments.

A desire to use chrome-free basic brick for environmental reasons has increased the importance of Magnesia Spinel Brick. Trivalent chromium (Cr+3) present in Magnesia Chrome Brick can be converted to the hexavalent state (Cr+6) by reaction with alkalies, alkaline earth constituents and other compounds that are present in some service environments. These factors have led to broad use of Magnesia Spinel Brick in rotary cement kilns. They have excellent spalling resistance, good thermal expansion characteristics and have been shown to provide excellent service results in many rotary kilns.

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Magnesia Spinel Brick  Magnesia Spinel Brick

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We can produce Harbinson Walker International standard Magnesia Spinel Brick for Cement/Lime Kiln, such as:

VESTA

Refrateknik1 We can produce Refratechnik standard Magnesia Spinel Brick for Cement/Lime Kiln, such as:

TOPMAG A1
TOPMAG AF
TOPMAG TR
RG S

OSYMEN

MgO

Al2O3

AP

BD

CCS

RUL

TSR

950°C Air

TE

1100°C

%

%

%

g/cm3

MPa

(Ta)°C

Cycles

%

MS-8AX

88.0

5-10

15.0

2.98

70

>1700

>100

1.20

MS-8AS

87.0

5-10

16.0

2.96

65

>1700

>100

1.20

MS-8A

86.0

5-10

17.0

2.94

65

>1700

>100

1.15

MS-8B

86.0

5-10

18.0

2.92

60

>1700

>100

1.15

MS-10AX

85.0

8-12

15.0

2.97

70

>1700

>100

1.20

MS-10AS

84.0

8-12

16.0

2.95

65

>1700

>100

1.20

MS-10A

82.0

8-12

16.0

2.93

65

>1700

>100

1.15

MS-10B

82.0

8-12

18.0

2.91

60

>1700

>100

1.15

MS-15AX

84.0

13-15

15.0

2.98

70

>1700

>100

1.20

MS-15AS

84.0

13-15

15.0

2.96

70

>1700

>100

1.20

MS-15A

80.0

13-15

16.0

2.94

65

>1700

>100

1.15

MS-15B

78.0

13-15

18.0

2.92

60

>1700

>100

1.15

MS-20AX

78.0

18-22

15.0

3.02

70

>1700

>100

1.20

MS-20AS

77.5

18-22

15.0

3.00

70

>1700

>100

1.20

MS-20A

77.3

18-22

16.0

2.98

65

>1700

>100

1.20

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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