Aluminum Magnesium Spinel Castable for Steel Ladle

Today, with the rapid development of metallurgical technology, the technical requirements for refractory materials used in ladles are getting higher and higher. Ultra-low cement-bound corundum alumina-magnesium spinel castables are used. It is characterized by good spalling resistance and resistance to alkaline ladle slag erosion. The service life of the ladle lining is significantly increased, the consumption is significantly reduced, and the molten steel is not polluted.

Corundum Alumina-Magnesia Spinel Castable

Corundum-based alumina-magnesium spinel castables use white corundum as aggregate and white corundum powder, alumina-magnesium spinel, and activated alumina as matrix. Pure calcium aluminate cement is used as the binding agent, and sodium hexametamate and sodium lignosulfonate are used as the composite water-reducing agent. It has the characteristics of load softening temperature greater than 1500°C, high flexural strength, high compressive strength, and easy construction. Compared with traditional corundum refractory castables, the corrosion resistance and spalling resistance are greatly improved, and the high-temperature strength of the castables is also improved.

Corundum Spinel Low cement Castable for Steel Ladle

The construction of corundum alumina spinel castables is slightly different from traditional castables. The main key points are the following:

1. Retarding technology is one of the key technologies in the construction of magnesium-aluminum castables. Retarders such as lignosulfonate need to be added in a timely manner according to changes in seasons and ambient temperature. The solidification time can meet the needs of pouring construction.

2. Adding some oversized aggregate and zircon powder to the castable is very beneficial to inhibit the occurrence of cracks.

3. The slag wire material adopts a high MgO ratio and adds some pre-synthesized aluminum-magnesium spinel powder, which can improve the slag erosion resistance of the slag wire.

4. During pouring construction, strictly control the amount of water added and vibrate evenly. It is of great significance to improve the service life of castables.

Aluminum magnesium spinel castables exhibit excellent corrosion resistance in ladle systems. High-grade alumina-magnesium spinel castables are becoming more and more widely used not only in ladles. It is also used in fields such as electric furnace covers, RH-impregnated tubes, seat bricks, and breathable bricks.

What are the Characteristics of Ladle Castables?

Ladle is a container used to receive molten steel in front of the open hearth, electric furnace, or converter in steelmaking plants and foundries. Then the molten steel received is transferred for pouring operations. Generally, the quality of the ladle affects the efficiency of smelting and transfer. The main factor that affects the quality of the ladle is the castables used in building the ladle. The quality of ladle castables affects the quality of the ladle and also affects the service life of the ladle, so you must choose good ladle castables when choosing.

The Composition and Characteristics of Ladle Castables

Ladle castables generally use corundum, alumina-magnesium spinel, fused magnesite, and other raw materials as aggregates. Then add some admixtures and make it through micro-powder bonding technology. It has good slag resistance, peeling resistance, thermal shock resistance, good strength and volume stability, etc. It also has the characteristics of high refractoriness, strong corrosion resistance, high adhesion rate, low resilience, easy spray repair, etc., and can resist the erosion of molten iron and slag. At the same time, it can be baked quickly without bursting, making it easy to repair and dismantle.

Application of Ladle Castables

Ladle castables are generally suitable for casting large and medium-sized ladle walls. At the same time, it is also used in various metallurgical industrial stoves and is widely used in metallurgy, petroleum, chemical industry, building materials, electric power, and other smelting industries.