Magnesia-chrome bricks are refractory products with MgO and Cr2O3 as main components and periclase and spinel as main mineral components. This type of brick has high refractoriness, high temperature strength, strong resistance to alkaline slag, excellent thermal stability, and certain adaptability to acidic slag. The main raw materials for the manufacture of magnesia-chrome bricks are sintered magnesia and chromite, and the purity of the magnesia raw materials is as high as possible.

The production process of firing magnesia-chrome bricks is similar to that of magnesia bricks. In order to eliminate the loose effect caused by the expansion of the brick during the firing process due to the reaction of MgO and Cr2O3, Al2O3 or iron oxides to form spinel, a synthetic co-sintered material can also be used to form the magnesia chrome brick.

In addition, there are not burnt magnesia chrome bricks. The non-burned magnesia chrome brick has a simple production process, low cost and good thermal stability, but the high temperature strength is far less than that of the fired brick.

In the late 1950s, a so-called "direct combination" magnesia chrome brick was developed. The brick is characterized by pure raw materials, high firing temperature, direct combination of high temperature phases such as periclite and spinel, and low-melting phase such as silicate is island-shaped, thus significantly increasing the high temperature of the brick strength and slag resistance.

The method of preparing the fine powder prepared by calcining the calcined billet with chrome ore-magnesia sand and the coarse particles of magnesia is an effective measure for eliminating the loose effect. Compared with ordinary magnesia chrome bricks, the magnesia chrome bricks produced by this method have low porosity, high compressive strength, load softening temperature and flexural strength. Magnesia-chrome bricks made of chrome ore-magnesite powder compacts and high-temperature calcined synthetic magnesia-chrome sands are better than other magnesia-chrome bricks in slag resistance and high temperature strength.

There is a molten cast magnesia chrome brick which is directly cast by using an electric orphan furnace molten magnesium chrome material, and a molten granule produced by the fused magnesia chrome material according to the brick making process and a magnesia chrome brick.