Home Brick for Cement/Lime Kiln Mullite-SiC Brick for Cement/Lime Kiln

Mullite-SiC Brick for Cement/Lime Kiln

Mullite-SiC Brick for Cement/Lime Kiln (MUSIC-168, 165, 155)
Mullite-SiC brick are mainly made of corundum, bauxite, mullite and silicon carbide burnt under medium temperature. It was excellent in resistance to thermal shock, thermal load fatigue, high-temperature mechanical flexibility and abrasion at the reducing atmosphere. They can be used in transition zone, safety zone, calcining zone and tertiary air duct of cement rotary kiln.

Super Grade Mullite-SiC Brick for Cement/Lime Kiln (MUSIC-168A, 165A)
Super Grade Mullite-SiC brick are one kind of enhanced product based on silicon carbide brick, through adding some amount of andalusite. They have much better resistance to thermal shock and acid and alkali corrosion as well as lower creep and higher strength under elevated temperature. They can be used in transition zone, safety zone and calcining zone of cement rotary kiln.


Mullite-SiC Brick for Cement/Lime Kiln Mullite-SiC Brick for Cement/Lime Kiln

Mullite-SiC Brick for Cement/Lime Kiln Mullite-SiC Brick for Cement/Lime Kiln

The performance of Mullite-SiC Brick for Cement/Lime Kiln (MUSIC) comes from its process. First of all, it is necessary to select super-grade bauxite with AI2O3 higher than 80% in raw materials. Silicon carbide should be pure and Mohs hardness should be close to 9.5. The selection of silicon carbide should be very strict. This mineral is very rare. Most products use SiO2 and C to synthesize SiC at high temperature in electric furnace. Different raw materials will lead to quality differences. At present, in the production process of SiC, SiO2 in raw materials comes from natural silica, C is taken from coal coke and petroleum coke. According to our research results, the silicon carbide synthesized from petroleum coke and SiO2 has high hardness and wear resistance, and is suitable for use as MUSIC. The main crystalline phases of fired bricks made from these raw materials are mullite, silicon carbide and corundum, which have high hardness, which lays the foundation for dense and high-strength refractory products.

Mullite-SiC Brick for Cement/Lime Kiln is characterized by high strength, wear resistance and Thermal Shock Resistance (TSR), and has achieved good use effect in the use of rotary kiln. The structure of the silica mullite brick is dense, the mullite and SiC crystals are stable, and the brick surface forms a continuous dense layer of SiO2, which prevents the erosion of gas and molten substances. SiC has high thermal conductivity, low thermal expansion coefficient and good TSR. These performance characteristics make the Mullite-SiC Brick for Cement/Lime Kiln not easy to break and flake, and because the thermal conductivity is lower than that of the magnesia material, the cylinder will not be heated too high, which not only ensures the normal operation of the rotary kiln cylinder, but also saves fuel.

In addition, the service performance of Mullite-SiC Brick for Cement/Lime Kiln is also significantly better than that of Spalling Resistant High Alumina Brick and Phosphate Bonded High Alumina Refractory Brick with good wear resistance.
Because the erosion of chlor-alkali components and poor TSR are the main reasons for the damage of refractory bricks in the transition zone, this product has a unique way to use neutral high-alumina bauxite clinker and silicon carbide as the main materials, and add andalusite for production. It has a relatively low apparent porosity. At the same time, it reduces the erosion effect of alkali sulfur on the lining bricks by taking advantage of the large infiltration angle between cement/Lime materials and alkali sulfur components and silicon carbide, Using the andalusite in the product to produce irreversible micro-expansion effect during secondary mullitization in the cement kiln (the test result is about 0.45%), the product will not shrink when encountering cooling, offset the shrinkage stress, and no structural peeling.

Compared with Magnesite spinel brick (MS), the thermal conductivity of Mullite-SiC Brick for Cement/Lime Kiln is relatively low, and the temperature of the cylinder where the Mullite-SiC Brick for Cement/Lime Kiln is used is relatively low under the same conditions. Therefore, under the social development trend of increasing attention to energy conservation and environmental protection, Mullite-SiC Brick for Cement/Lime Kiln is increasingly used in cement/Lime rotary kiln. Generally, MUSIC-165 can be used in the upper transition zone. Due to the high temperature and severe wear and erosion at the lower transition zone and kiln mouth, only CMAS or MUSIC-168 can be used.
Mullite-SiC Brick for Cement/Lime Kiln has the advantages of stronger corrosion resistance and the disadvantages of high thermal conductivity. In the systematic treatment of garbage and cement/Lime rotary kiln, magnesia-alumina spinel brick has better corrosion resistance to alkali and sulfur. Therefore, in large rotary kiln, magnesia-alumina spinel brick is still mostly used for masonry from the perspective of safety factor.

Refrateknik1 We can produce Refratechnik standard Mullite-SiC Brick for Cement/Lime Kiln, such as:

RA SiC T

OSYMEN

Al2O3

SiO2 + SiC

SiC

AP

BD

CCS

RUL

TSR

1100°C Water

PLC

WR

%

%

%

%

g/cm3

MPa

(Ta)°C

Cycles

%

Cm3

MUSIC-168A

66.0

27-32

14

19

2.70

100

1660

17

0.30

3.5

MUSIC-168

66.0

27-31

10

19

2.68

100

1660

12

0.28

3.5

MUSIC-165A

64.0

27-32

10

19

2.65

95

1610

14

0.28

3.5

MUSIC-165

64.0

24-30

8

19

2.63

95

1610

12

0.20

3.8

MUSIC-155

66.0

27-32

6

19

2.58

90

1560

14

0.10

4.0

AP: Apparent Porosity   |  BD: Bulk Density  |  CCS: Cold Crushing Strength  |  RUL: Refractories Under Load  |  TSR: Thermal Shock Resistance  |  PLC: Permanent Linear Change  |  WR: Wear Risistance

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Last updated: 2024-01-03
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