Improvement and using of furnace refractory material

Open hearth furnace masonry damage mainly caused by slag and liquid steel chemical erosion and high temperature corrosion and spalling. Open hearth is most easily damaged, is the weak link in the whole lining, directly related to the small yield of furnace. Therefore, all the countries take the thin furnace top as an important technical index of open hearth furnace; open hearth furnace life refers to the so-called top life. Enter sixty ages, the world each for open hearth furnace adopting ordinary alkaline brick masonry. China is widely used magnesia brick, the medium-sized open hearth furnace service life reached about 1000 times.

With the development of open hearth oxygen blowing intensified smelting, the production efficiency is improved, but the decline in life. To this end. We must improve the brick quality, development of new varieties, to meet the need of strict furnace smelting process. In this case, the British in the 1959 car developed directly combines the basic brick manufacturing, the key is using high purity raw materials, high pressure shaping and high temperature firing. In order to combine the firebrick and magnesia brick firing temperature and high temperature relation of bending strength. With increasing the burning amyl temperature, direct burning of magnesia chrome brick flexural strength increases, and magnesia brick to 1800 C strength decreases. As is said, in order to obtain the excellent combination of magnesium lead bricks, the sintering temperature should be greater than 1700 DEG C, the best sign about 1800 DEG C firing.