Magnesia-alumina Spinel Brick
Magnesia-alumina Spinel Brick are made of high-quality magnesia sand and low-calcium industrial alumina powder as the main raw materials, and are formed by high pressure, and high temperature firing. They are resistant to quenching and rapid heating, and have good corrosion resistance to solvents such as iron oxide and alkaline slag. When the temperature fluctuates, the expansion and contraction of magnesia-alumina spinel bricks are relatively uniform. What is more, the resistance of magnesia-aluminum spinel bricks to alkali slag and iron oxide slag is stronger than that of magnesia bricks.
Features：
1. Good thermal stability
In the course of the use of clinker with the reaction, the brick surface forms a thin layer of calcium aluminate protective layer, so that the liquid is not easy to penetrate.
2. Good anti-peeling performance
Magnesium aluminum spinel brick is better than the direct combination magnesia-chrome brick at anti-peeling performance. The life of the cooling zone and the transition zone of the kiln can be directly combined with magnesia-chrome brick. However, the corrosion resistance is slightly inferior to the direct combination magnesia-chrome brick.
3. High strength and high wear resistance
Sintered spinel brick is easy to hydrate, resulting in larger coefficient. The kiln body temperature is higher than the direct combination magnesium chrome brick.
4. Anti-quenching and emergency hot
5. Good corrosion resistance
6. High refractoriness
7. Good slag resistance
8. Low porosity
Specification Of Magnesia-alumina Spinel Brick：
| Item | Specification | |||
| MLJ-90 | MLJ-85 | MLJ-80 | MLJ-75 | |
| MgO % | ≥90 | ≥85 | ≥80 | ≥75 |
| Al2O3 % | 3~8 | 5~12 | 8~17 | ≥8~12 |
| Apparent Porosity, % | ≤17 | ≤17 | ≤16 | ≤19 |
| Bulk Density, g/cm3 | ≥2.95 | ≥2.95 | ≥2.90 | ≥2.85 |
| CCS, MPa | ≥45 | ≥45 | ≥55 | ≥40 |
| 0.2MPa RUL℃ | ≥1700 | ≥1650 | ||
| TSR, Cycle 1100℃ Water | ≥3 | ≥8 | ≥12 | ≥8 |
Magnesia Alumina Spinel Brick Properties:
This magnesium-aluminum spinel brick fired at 1750℃ has a very low porosity (less than 9%) and a volume density of 3.22-3.23g/cm3.
The volume density of the porosity of 12-17% is 2.9-3.1g/cm3. The direct bonding rate between high melting point grains in the refractory brick is very high,
so the strength at room temperature and high temperature is very high, the load softening temperature is 1700-1750℃, and the creep resistance is also very strong.
This kind of refractory brick has a strong ability to resist the penetration of silicates and iron-containing slag, and is not easy to form a thick metamorphic layer,
especially when the brick contains a small volume of 8-25μm pores.
At the same time, it also has excellent resistance to direct erosion by molten slag.
Application：
Steel industry: used for lining of steel smelting furnaces, such as converters, electric furnaces and ladles, mainly because of its excellent high temperature resistance and resistance to molten metal corrosion.
Cement industry: used in the high temperature zone of cement rotary kilns, it can withstand extreme temperatures and wear.
Glass industry: used in glass melting furnaces to resist high temperatures and erosion by molten glass.
Non-ferrous metal smelting: used in non-ferrous metal smelting furnaces, such as aluminum smelting furnaces, with good chemical corrosion resistance.
Why choose us?
1.Abundant Experience： Rongsheng Group have over 20 years experience in the refractory industry and we have a deep understanding of the materials
and applications we work with. We can provide expert advice and guidance to help customers find the best solutions for their needs.
2.Quality products: We pride ourselves on providing high-quality refractory products that are made to last. Our materials are carefully sourced and tested
to ensure they meet our strict standards.
3.Competitive Price: We offer competitive pricie on all of our products without sacrificing quality and make the products competitive in your market.
4.Customization: We understand that every customer is unique, which is why we offer customized solutions tailored to their specific requirements.
Whether it’s a custom shape or size, we can work with customers to create the ideal product for their application.
5.Safety: We take safety seriously and ensure that all of our products meet safety standards. Safty packing, prompt delivery time, and excellent after-sales services.
6.Large stocks: With a large stock of products on hand, we can better serve our customers, save money, and gain a competitive edge in their industry.
7. Overall solutions: We offer optimal and comprehensive solutions to supply the necessary refractory material for your high temperature kiln.
So choosing us is the right choice for you.If you are interested in our products or if you have any question, pls feel free to contact us at any time. We will reply as soon as possible.
