Application of recycled magnesia carbon bricks in amorphous refractory materials

Application of recycled materials in amorphous refractory materials

With the shortage of domestic magnesia supply and the continuous increase in magnesia prices, magnesia refractory materials, especially magnesia carbon brick recycled materials, have once again received industry attention. There are countless cases of producing shaped refractory products with magnesia carbon brick recycled materials and the economic benefits they generate. Therefore, the application and development of magnesia carbon bricks in amorphous refractory materials have also attracted industry attention.

1、 Application of Magnesia Carbon Castable in Ladle Slag Line

Scholars have applied the recycled particles of magnesia carbon bricks to the production of magnesia carbon castables for ladle slag lines. Adding the recycled particles of magnesia carbon bricks to the magnesia carbon castables can solve the problems of excessive water addition and graphite granulation in the magnesia carbon castables. This method achieves the recycling and utilization of waste magnesia carbon bricks, but the use effect of castables is definitely worse than that of bricks, and it is currently used less, This utilization method cannot achieve large-scale and large-scale efficient utilization of recycled materials from waste magnesia carbon bricks.

Yao Jinfu et al. prepared ladle spray repair material by adding 20% (w) magnesium carbon recycled material. The results showed that the recycled spray repair material had good adhesion and durability compared to conventional spray repair materials. Regenerated spray repair materials have increased water demand, decreased density, and increased apparent porosity. They have better slag resistance than commonly used spray repair materials, but the non wetting of graphite and other components limits the amount of recycled materials added. This method does not reduce the utilization value of waste magnesia carbon bricks, but the technology is not yet mature, and the amount used is not very large. The proportion of waste magnesia carbon bricks added is not very large.

Gong Xiumin added 15% (w) recycled magnesia carbon brick to prepare steel ladle edge casting material. This ladle edge material has good strength, anti slag effect, and excellent thermal shock resistance. However, its added value is relatively low, the amount of waste added is relatively small, and the amount is not particularly large, making it not a choice for efficient utilization of waste magnesia carbon bricks.

2、 The application of dry materials in intermediate packaging

The refractory materials used in the intermediate package are mainly magnesium refractory materials, including dry materials, coating materials, slag retaining walls, and nozzle seat bricks. Most materials do not have particularly high strength requirements. For steel mills with less strict requirements for carbon content, refractory materials can be used for intermediate packaging, and recycled magnesia carbon bricks can be added in small quantities to some products to reduce production costs. Nowadays, the price of magnesia has been rising all the way, and adding magnesia carbon recycled materials when there is a MgO content limit in the product may not be worth the cost. Slag line dry material, manufacturer of slag line dry material, price of slag line dry material

Yuan Tianyi et al. studied the use of shaped and recycled magnesia carbon brick particles to partially replace 95 grade magnesia sand in the preparation of intermediate package dry materials. The research results showed that the use effect of shaped recycled materials is better than that of unshaped materials, with a maximum addition amount not exceeding 30%, which can meet the requirements of use. Zheng Kai et al. applied for a magnesia carbon dry material for the intermediate ladle, with a dosage (w) of recycled magnesia carbon bricks with particle sizes of 3~1 and 1~0.3mm ranging from 65% to 82%. The inner lining of the intermediate ladle working layer produced has excellent erosion resistance and erosion resistance. Jiang Qunying applied for a coating material. The amount of recycled magnesia carbon brick material added is about 80%, which can replace traditional coating materials. The quality is stable and not affected by false particles of recycled materials.

The grade of magnesia raw materials used in the intermediate package is lower than that of magnesia raw materials used in magnesia carbon bricks. Although alternative use increases its added value compared to the introduction of other amorphous products, it has not fully reflected the value of high-grade magnesia sand. The amount of recycled materials added is relatively small and requires shaping treatment, and their use is also limited by requirements such as magnesium oxide and carbon content, which is not suitable for large-scale and efficient utilization of magnesia carbon brick recycled resources.