This passage we will continue to talk about the heat storage effect of magnesia bricks immediately after the previous article.
The production process of fired magnesia-chrome bricks is generally similar to that of magnesia bricks. In order to eliminate the MgO and Cr2O3, Al2O3 or direct combination of magnesia-chrome bricks during the firing process.
The loosening effect caused by the expansion of iron oxides to form spinel can also be made of magnesia-chrome bricks by using synthetic co-sintered materials. In addition, there are unburned magnesia chrome bricks, for example, unburned Wholesale Magnesia Chrome Brick combined with inorganic magnesium salt solutions. The production process of unburned magnesia-chrome bricks is simple, the cost is low, and the thermal stability is good, but the high temperature strength is far less than that of fired bricks. In the late 1950s, a so-called “direct-bonded” magnesia-chrome brick was developed. The characteristics of this kind of brick are pure raw materials, high firing temperature, direct bonding between high temperature phases such as periclase and spinel, and low melting phases such as silicate are distributed in islands. Therefore, the high temperature of the brick is significantly improved. Strength and slag resistance.
The method of making bricks by co-grinding and calcining the compacts with chrome ore and magnesia is an effective measure to eliminate the loosening effect. Compared with ordinary magnesia-chrome bricks, the Wholesale Magnesia Chrome Brick made by this method have lower porosity and higher compressive strength, softening temperature under load and flexural strength. The magnesia-chrome bricks made of chrome ore-magnesite powder compacts and synthetic magnesia-chrome sand calcined at high temperature have better slag resistance and high-temperature strength than other magnesia-chrome bricks.
In addition, there are also fused-cast magnesia-chrome bricks obtained by directly casting magnesia-chromium materials in an electric furnace, and fused Wholesale Magnesia Chrome Brick produced by fused magnesia-chromium materials according to the brick-making process combined with magnesia-chrome bricks.
Magnesia bricks are also called ordinary magnesia bricks. The MgO content is above 80%-85%. It is made of natural magnesite calcined at high temperature to obtain sintered magnesia (magnesia) as the main raw material. Additives and binders are added. After mixing, molding and drying, it is fired or fused at high temperature. Common magnesia bricks include sintered magnesia bricks and fused magnesia bricks.
