Magnesium carbon brick production to consider what?

When choosing magnesia, the content of magnesium oxide is only one factor, and the density of magnesia is also an extremely important factor. Under the premise of the same production process, the theory should be that the higher the content of magnesium oxide, the smaller the porosity and the higher the density. However, driven by economic interests, some cases are not so, so we must pay attention to the selection of magnesia, in addition to looking at the content of magnesium oxide, but also look at the density of magnesia, especially for the purchase of granular material manufacturers are particularly important.

Fuel cost for the production of magnesia is one of the most important costs, whether it is fused magnesia or sintered magnesia are so, so now many manufacturers in order to reduce production costs, greatly reduce the time of melting and sintering, so as to reduce energy consumption, so that brings a lot of negative effects, the most prominent performance is the existence of raw materials underburning, for magnesia, The under-fired magnesia is characterized by small grain size, low density and much fine powder after crushing.

Compared with sintered magnesia, fused magnesia has large grain size, good density, low porosity and strong slag resistance, especially large crystalline magnesia. In addition, the higher the magnesium oxide content, the lower the corresponding harmful impurity mass, especially silicon dioxide, the lower the silicon dioxide content, the less the silicate low melt generated in the product at high temperature, the less the low melt, the lower the probability of reaction with graphite, the better the performance of the product. The larger the grain size, the higher the degree of direct binding of the product, the less the liquid phase of the grain boundary, to avoid the slag from the liquid phase of the grain boundary erosion of the product.

Therefore, with the development of magnesia carbon bricks, in order to improve the performance of products, the production of magnesia carbon bricks began to tend to use fused magnesia. However, due to the high density of fused magnesia, low porosity, and poor wettability of the binder, and sintered magnesia can compensate for this problem, it is sometimes used in combination with fused magnesia and sintered magnesia. Due to the poor market in recent years, sintered magnesia occupies an increasing share in the production of magnesia-carbon bricks.

According to the results of the use of magnesia carbon bricks in steel mills, the field use effect is relatively good magnesia carbon bricks are generally produced with high magnesium oxide content, high density, large crystalline particles, and high calcium-silicon ratio of magnesia.