Application Scope of Refractory Materials -1

1. Steel making system

The steelmaking system includes equipment such as converters, electric furnaces, external refining furnaces, ladles, and intermediate ladles.
In electric furnaces, dry vibrating materials, prefabricated or cast-in-place furnace covers, or triangular areas of furnace covers have achieved good usage effects;
In converters and electric furnaces, refractory spray coatings are generally used for repair when damage occurs. The methods include manual repair, wet, dry or flame spraying, and slag splashing for furnace protection.
In the converter, slag splashing protection technology is commonly used, and the furnace life can reach more than 10000 times;
There are many types of refining furnaces outside the furnace. The insertion tube lining of the RH and DH degassing devices is generally cast into a whole using high alumina Refractory castable, with a service life of 20-80 times.
Ladles and intermediate ladles are important auxiliary equipment of steelmaking furnaces, and they are also the thermal equipment that consumes the most refractory materials. In the past, steel ladles were generally built with fired bricks such as clay refractory bricks, high alumina refractory bricks, semi silica bricks, and paraffin bricks, with a service life of 10-70 times. When using ladle blowing or continuous casting, the ladle age drops sharply due to high tapping temperature and long residence time. Therefore, countries attach great importance to the development of lining materials and have made significant progress.
A certain steel plant uses a 200t ladle for the converter, lined with aluminum magnesium casting material and self flowing material, with a ladle age of about 95 times and 80 times, respectively;
A certain steel plant uses a 300t ladle for the converter, which is lined with high-purity aluminum magnesium casting material. After repair, the ladle age is generally around 260 times, and the refractory material consumption is less than 1.78kg per unit;
Many steel mills across the country use new technology aluminum magnesium Refractory castables for steel ladles with a capacity of no more than 100 tons. The ladle age is about 90 times, and the cost of pouring steel is 5.50-7.50 yuan per ton of steel.
The insulation board or magnesium coating used for the lining of the intermediate package, and the mullite, aluminum-magnesium, and magnesium refractory castables used for the slag blocking dam can meet the technical requirements of continuous steel casting.
Integrated spray gun for external refining, used for ladle slag blowing or ladle powder spraying, etc. The parts above the slag line are made of high alumina refractory castable, and the parts from the slag line to the nozzle are made of low cement corundum refractory castable, which is vibrated and formed into a whole wrapped lining.