Refractories are basic materials for high-temperature industries such as steel, nonferrous metals, petrochemicals, building materials, and electric power, and are important supporting materials for high-temperature industrial thermal equipment. The four major downstream application areas are: steel industry, cement industry, non-ferrous metal smelting process and flat glass industry.
The steel industry
70% of the downstream demand for refractory materials is the steel industry, which is used in blast furnaces, converters, electric furnaces, ladle furnaces, LF furnaces, RH furnaces and continuous casting systems.
The steel production process is to smelt iron ore into pig iron in a blast furnace, inject molten iron into a converter or electric furnace to smelt into steel, then cast the molten steel into continuous casting billets or steel ingots, and process them into steel for various purposes through plastic deformation methods such as rolling. . In steel production, because of the different working environment and use requirements of various furnaces, there are also different requirements for refractory materials.
Electric furnace cover: high alumina, mullite, corundum, chromium corundum castable.
Main furnace wall of electric furnace: directly combined with magnesia chrome bricks, pre-reacted magnesia chrome bricks and magnesia bricks
Slag lines and hot spots: oil-impregnated magnesia bricks, direct bonded magnesia chrome bricks, fused cast magnesia chrome bricks, magnesia carbon bricks
Furnace bottom insulation layer: a layer of asbestos board, topped with diatomaceous earth powder, and flat-layed insulation bricks on top
Permanent floor of the furnace bottom: staggered masonry such as fired magnesia bricks, asphalt combined with magnesia bricks, etc.
Furnace bottom working layer: knotted furnace bottom: magnesia + asphalt, tar, magnesia-calcium iron sand; masonry furnace bottom: asphalt combined with magnesia bricks, brine combined with magnesia bricks
Steel tap: high-strength magnesia carbon brick, Al2O3-SiC-C brick