Application of Alkaline Resistant Brick in Cement Kiln

Alkaline Resistant Brick, it is made of low-alumina refractory clay as the main raw material. Because of its chemical composition, it can form a certain thickness of alkali-resistant protective layer on its surface. Therefore, it is widely used in the cement pre-differentiation kiln system as the brick lining. Rongsheng refractory manufacturer has stocks of Alkaline Resistant Bricks and refractory mortar for cement kilns lining, and supports customized Alkaline Resistant Bricks for cement kilns.

Working Environment in Cement Kiln

Because the Alkaline Resistant Brick products have the characteristics of stable volume, strong resistance to alkali erosion, and penetration resistance. The application of Alkaline Resistant Bricks in cement kiln is mainly in the preheater, decomposition furnace, tertiary air duct and other parts of cement kiln.

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Compounds causing damage in cement kilns: alkali metal oxides (potassium oxide and sodium oxide), sulfates and chlorides. They are brought into the cement kiln system through raw meal. And because traditional fuels are more and more replaced by residues and alternative fuels, the compounds that cause damage are more brought into the kiln. Therefore, the internal circulation of alkali and sulfur varies depending on the degree of volatilization.

In the production of cement rotary kiln, it comes from harmful ingredients such as alkali, sulfur and chlorine in raw materials and fuel. In the high temperature zone, the sulfates and chlorides will escape with the kiln gas. In addition to the erosion damage to the alkaline bricks in the firing zone and transition zone, the damage he caused has been to the kiln smoke chamber, differentiation furnace, preheater and so on. As the temperature drops, it coagulates and enriches, and it can penetrate into the ordinary clay bricks and react with the brick body to generate swellable minerals. Clay bricks crack and brick lining fall off, which called “alkali crack” damage.

Application of Alkaline Resistant Brick

In addition, because of the high temperature of the clinker leaving the kiln, the alkali continuously evaporates from the clinker. Corrosion of the clay bricks at the hot end of the grate cooler, the kiln head smoke chamber and the kiln door cover constitutes an “alkali crack”. Alkali-resistant brick is an alkaline resistant clay brick with Al2O3 content of 25% -28%. It can cause the alkali in the kiln gas to condense on the brick surface and quickly react with the brick surface. It forms a high-viscosity glaze layer, which closes the continuous corrosion channels of alkali to the inside of the refractory brick body, avoiding “alkali cracking”, and then protect the furnace bricks.

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RS Alkali Resistant Brick Manufacturer

The Alkaline Resistant Bricks used in cement kilns are high-quality refractory bricks with strong alkali-resistant ability, good thermal shock resistance and high cost performance. If there is much chlorine in the cement kiln, the SiO2 content in the refractory brick can be increased appropriately. Increase the ability of the refractory brick surface to be combined with chlor-alkali to make sticky, and make alkali-resistant clay brick resistant to chlor-alkali corrosion. In addition, different alkali-resistant bricks, such as high-strength Alkaline Resistant bricks, light-weight insulation alkali-resistant bricks, etc., can be used for the brick lining according to different parts of the cement kiln.

Rongsheng refractory material manufacturer provides customers’ furnace bricks with high-quality. You can buy Refractory brick products from RS Manufacturer at affordable prices. While solving the furnace bricks lining problems for you, it saves your costs.

Cement Industry Refractories

Rotary Cement Kiln Refractories

Based on the working condition of rotary cement kiln components, corresponding refractory materials should be chosen to meet the production requirement and obtain ideal cost performance.

1. Unloading port and unloading belt: Unloading belt usually adopts 70-80% high-alumina brick, thermal shock resistant high alumina brick, spinel brick, chrome-brick. For discharge port, high alumina brick and corundum heat resistant concrete are usually used, sometimes, silicon carbide brick or castable is also a good choice.
2. Sintering zone: Magnesia chrome brick, sodium polyphosphate bonded magnesia brick, alkali resistant brick and directly bonded magnesia chrome brick are often used at sintering zone. Although magnesia iron spinel brick has better kiln coating adhesion effect, it’s price is too high, so low chrome periclase spinel brick are popularly used at this part.
3. Transition zone: Corundum brick, 50-80% high alumina brick, direct bonded magnesia brick, ordinary magnesia chrome brick and spinel brick.
4. Cooling zone: magnesia chrome brick, high alumina brick, phosphate bonded high alumina brick, magnesia alumina spinel brick, etc.
5. Decomposition zone: Clay bricks and high alumina bricks are used at the part adjacent to preheating zone. 50-60% high-alumina bricks, ordinary magnesia chrome bricks or spinel bricks are used at high abrasion and high temperature zone that connects transition zone.
6. Pre-heating zone: alkali resistant insulating clay bricks.
7. Preheater system: alkali resistant brick and insulating brick.
8. Cooling machine system: refractory brick, lightweight castable, insulation material. Material loading part and high temperature zone can adopt general application magnesia chrome bricks, high-alumina bricks and clay bricks can be used for the medium and low temperature areas.

Main Refractories Physiochemical Index

New Type Dry Rotary Cement Kiln Refractories

1. Preheater mechanical chained pipe: ordinary alkali resistant brick, alkali resistant castable.
2. Decomposition furnace: anti-stripping high alumina brick, high alumina castable, alkali resistant brick, alkali resistant castable.

3.Tirtary air ducts: high strength alkali resistant bricks, alkali resistant castable.

4. Grate cooler: high alumina castable, alkali resistant castable, stripping resistant high alumina brick, SiC composite brick, ordinary high alumina brick, chamotte brick.
5. Kiln hood: anti-flaking high alumina brick, ordinary high alumina brick, high alumina castable.
6. Burner: high alumina castable, corundum castable.
7. Rotary kiln front hood: corundum castable, steel fiber high alumina castable, alkali resistant brick, SiC composite brick
8. Lower transition zone: alkaline brick, anti-flaking high alumina brick.
9. Sintering zone: basic brick, high quality phosphate high alumina brick.
10. Upper transition zone: alkaline brick, anti-flaking high alumina brick.
11. Decomposition zone: alkaline brick, high quality phosphate high alumina brick, anti stripping high alumina brick.
12. Pre heating zone: Flaking resistant high alumina brick, phosphate high alumina brick, alkali resistant insulating brick, alkali resistant chamotte brick.
13. Rear kiln inlet: high alumina castable.