Production process and application fields of magnesium chromium brick manufacturers

Application field: Magnesia carbon bricks for converters

Magnesium chromium bricks are mainly used in the metallurgical industry, such as constructing open hearth furnace tops, electric furnace tops, external refining furnaces, and various non-ferrous metal smelting furnaces. The high-temperature part of the ultra-high power electric furnace wall adopts fused cast magnesium chromium bricks, the high erosion area of the refining furnace outside the furnace adopts magnesium chromium bricks made of synthetic materials, and the high erosion area of the non-ferrous metal flash smelting furnace adopts fused cast magnesium chromium bricks and magnesium chromium bricks made of synthetic materials. In addition, magnesia chrome bricks are also used in the burning zone of cement Rotary kiln and the regenerator of glass kiln. Magnesium brick manufacturer

Magnesia carbon bricks for converter use

The production process of firing magnesium chromium bricks is generally similar to that of magnesium bricks. In order to eliminate the loosening effect caused by the reaction of MgO with Cr2O3, Al2O3 or iron oxides during the firing process of bricks to generate spinel, a synthesized co sintered material can also be used to make magnesium chromium bricks. In addition, there are unburned magnesium chromium bricks, for example, unburned magnesium chromium bricks combined with inorganic magnesium salt solutions. The production process of unburned magnesium chromium bricks is simple, cost-effective, and has good thermal stability, but the high-temperature strength is far inferior to that of fired bricks. In the late 1950s, a so-called "direct bonding" magnesium chromium brick was developed. The characteristics of this type of brick are pure raw material, high firing temperature, direct bonding between high-temperature phases such as periclase and spinel, and isolated island distribution of low melting phases such as silicate. Therefore, it significantly improves the high-temperature strength and slag resistance of the brick.

The method of producing bricks with fine powder produced by co grinding and calcining chrome ore magnesia compacts, combined with coarse magnesia particles, is an effective measure to eliminate the loosening effect. Compared with ordinary magnesium chromium bricks, the magnesium chromium bricks made by this method have lower porosity, higher compressive strength, load softening temperature, and flexural strength. The magnesia chrome brick made of chrome ore magnesite powder compact and high temperature calcined synthetic magnesia chrome sand has better slag resistance and high temperature strength than other magnesia chrome bricks.

In addition, there are also fused magnesium chromium bricks directly cast using an electric arc furnace to melt magnesium chromium materials (see microstructure diagram, see color diagram), and fused particles produced using electric fused magnesium chromium materials according to the brick making process are combined with magnesium chromium bricks.