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.

The electric arc furnace cover must use high alumina brick to prolong the service life

Electric arc furnace is a kind of using arc heating so as to high-temperature melting furnace metal equipment, but in the melting process, will produce very high temperature especially furnace cover place, while the high temperature also easily lead to cover the damage of electric arc furnace, which we need to do protection work relative to the therefore, we will choose high alumina brick to prolong the service life of electric arc furnace.

In the past the furnace cover mainly uses the silica brick masonry, but because of its refractory degree is not high, poor thermal shock resistance, slag corrosion occurred in droplet and spalling, resulting in shortening the service life. We therefore after changing a began to choose high aluminum brick with excellent performance and high alumina unshaped refractory material, so the service life can be improved, and will be 2 – 3 times higher to silica brick. If it is ultra high power EAF, because working conditions even worse, using firing or caustic soda high aluminum brick, this is because the high temperature strength of refractory brick is low, since the major, for hanging structure. Using direct bonded brick and magnesia chrome brick than ordinary magnesia brick and magnesia chrome brick is good, can greatly reduce the damage caused by thermal cracking structure cracking and spalling.

The above contents cover the, must use high alumina brick to prolong the service life of electric arc furnace in the knowledge that you have some understanding of it, if you want to ask more knowledge about the high aluminum bricks can consult us.