Magnesia manufacturer introduces the main products and status quo of refractory-fired magnesia

The main specifications of refired magnesia are 0mm-0.5mm; 0 mm - 1 mm; 1 mm - 3 mm; 3 mm - 5 mm; 5 mm - 10 mm; 10 mm to 30 mm; 50 mm - 200 mm; 200 mm - 500 mm; The refractory-magnesite products are mainly made of high-content magnesite calcined by iron scale vertical kiln. It is an ideal raw material for the manufacture of unshaped refractories. The refractories produced from it are mainly used in the iron and steel industry, but also in glass, cement, and non-ferrous metallurgy industries. It is widely used in open hearth furnace, electric furnace bottom and ramming furnace lining because of its good high temperature bending strength, slag resistance and corrosion resistance. The lining refractories of the steel furnace, in addition, is also the manufacture of refractory brick refractories of high quality ideal materials.

From the perspective of historical development, sintered magnesia is also called metallurgical sand, refired magnesia, medium-grade magnesia, and high-purity magnesia. In China, magnesite is used as raw material, and CCM is produced by light firing in a reverberatory furnace, with large quantity and wide application. Light burning magnesium oxide powder is a kind of very important magnesia based raw materials, according to their different chemical composition, particle size and performance respectively applied to: pressure ball calcined various grade sintered magnesia (DBM), and the content of Al2O3, CaO to synthesize calcium magnesium magnesium aluminate spinel sand, sand and other composite materials, production of fused magnesia levels (FM, refractory or electrician), converter slag splashing magnesium ball and so on. The above products are mainly used as raw materials for refractory products. In addition, these products are also raw materials for magnesium chemical products such as lightweight MgO, lightweight MgCO3, magnesium fertilizers, magnesium building materials, feed additives and so on.

The traditional light calcined magnesium oxide is produced by roasting raw ore in a reverberatory furnace. After 70 ~ 80 years of survival and development, the production of light fired magnesia by reverberatory furnace has not been eliminated, because the kiln has its outstanding characteristics: simple process and practical; Less investment, fast mount, easy to operate; It is suitable for the characteristics of magnesite in southern Liaoning. In recent years, the kiln type also had greater improvement in production technology, mainly displays in: use clean fuel, the original simple directly instead of burning coal to gas generator production of gas as fuel for roasting, avoid pollution fuel ash content of light burned magnesia, basically solved the black smoke emission pollution to the environment, and improve the thermal efficiency; The kiln type was reformed to increase the volume of the kiln, increase the output and reduce the fuel consumption.

Sintered magnesia. GB/T2273-2007 specifies the physicochemical properties of sintered magnesite with MgO content of 83%~98%, which is suitable for the production of refractories.

Metallurgical sand. In China's five-year plan (1952-1957) during the period of Soviet aid of our country basic refractory factory --, anshan iron and steel company in the first phase of magnesia brick factory, the production of the system using the fine grinding ore sand workshop, into a ball plate, grate machine, rotary kiln of semi dry process, production of metallurgical sand used in open hearth furnace bottom and repair. The product was phased out in the 1990s as open-hearth furnaces were converted to converter.

At present, the total production of sintered magnesia in China is 4 million to 4.5 million tons per year. Following the industry habits, sintered magnesia can be roughly divided into heavy fired magnesia, medium-grade magnesia, high-purity magnesia.