Utilization status of discarded magnesia carbon bricks

 At this stage, the iron and steel industry has overcapacity. With the country's continuous strengthening of capacity reduction, the continuous deepening of supply-side reforms, and the increasing attention to environmental protection effects, energy conservation and consumption reduction have gradually become the key to the survival of iron and steel enterprises. The steel industry has a huge demand for refractory materials, and the annual output of waste refractory materials has reached 7 million tons. Among them, most of the refractory materials dismantled after use by steel mills are magnesia-carbon. Recycling it not only greatly saves production costs, but also achieves environmental protection and solid waste recycling. Therefore, the development and utilization of waste magnesia carbon bricks at home and abroad has been increasing. The current status of the utilization of waste magnesia-carbon bricks by domestic and foreign iron and steel enterprises is as follows.

1. Preparation of metallurgical auxiliary materials

As an important way of recycling economy for metallurgical enterprises, the recovery of waste refractory materials and the preparation of metallurgical auxiliary materials have developed rapidly. Domestic Company cooperates with Henan Company to combine waste magnesia-carbon bricks and some additives to make multifunctional magnesium balls, which can replace dolomite in full or part as slag-making auxiliary materials, which are the steelmaking, slag-making process and slag-splashing process of the converter creating condition.

2. Preparation of recycled magnesia carbon bricks

Baosteel uses waste magnesia-carbon bricks from the ladle slag line as raw materials, after sorting, removing surface inclusions, slag and oxide layer, hydration and other treatments, adding 3% to 4% thermosetting phenolic resin ingredients and mixing them at 200℃, 260MPa Recycled ladle magnesia carbon brick are made after hydraulic pressure and 5h curing treatment, the effect is similar to the use of new magnesia-carbon bricks.

3. Preparation of tundish dry materials

The main raw material of tundish magnesia dry vibrating material is fused magnesia. With the changes in market demand in recent years, its price has far exceeded the cost, making the production of magnesia dry vibrating material basically without economic benefits. This situation has promoted the development of the use of recycled magnesia-carbon materials to prepare tundish dry materials. Guangzhou Iron and Steel, Maanshan Iron and Steel, etc. have conducted related research.

Guangzhou Iron and Steel has carried out research on the partial replacement of mid-range magnesia with waste magnesia carbon bricks to prepare dry materials for recycled tundishes. The waste magnesia-carbon brick particles were used to partially replace the mid-grade sintered magnesia in the original composition for batching. After making the strip samples, the performance was tested. It was found that both the shaped and unshaped waste magnesia-carbon brick particles could be used for the dry material of the tundish, and the shaping was used. When granular, the overall performance is better.

4. Preparation of gunning material for ladle

The magnesia-carbon bricks disassembled from the steel ladle slag line of Shan Iron & Steel Co., Ltd. are treated as qualified raw materials after removing the surface slag and iron, crushing, removing iron, and sieving. Since Shan Iron & Steel's ladle gunning repairs the slag line of the red hot ladle, the water in the sprayed layer quickly evaporates due to the high gunning temperature, making Al4C3 too late to hydrate. Therefore, it is not necessary to hydrate the raw materials during the production process.

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Article Source:Utilization status of discarded magnesia carbon bricks

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