1What Is Magnesia Chrome BrickNews

Magnesia chrome brick is composed of magnesia (MgO) and chromium oxide (Cr2O3) as the main ingredients and periclase and spinel as the main mineral components. It has high refractoriness, good high temperature strength, good corrosion resistance to alkali slags, and excellent thermal stability as well as some adaptability to acid slags.

Magnesia chrome brick is made of sintered magnesia and chromite as the main raw materials. The magnesia should have as high purity as possible. The chromite should consist of Cr2O3 30-45% and CaO ≦1.0-1.5%. Its manufacturing process is almost the same to that of magnesia brick.

In order to eliminate the loosing and expansion caused by the reaction between MgO, Cr2O3, Al2O3 and iron oxide into spinel, synthetic joint sinter feed can also be used.

Besides, there are also non-burnt bricks, such as non-burnt magnesia chrome brick bonded with inorganic magnesium salt solution. The non-burnt brick has simple manufacturing process, low cost and good thermal stability, but lower high temperature strength than fired brick.

In 1950s, direct bonded magnesia chrome brick was developed. It is characterized with pure raw materials and high firing temperature. The high melting point phases such as periclase and spinel are directly bonded and the low melting point phases such as silicate are in isolated distribution. Therefore, the high temperature strength and slag resistance are significantly improved.

In addition, there are also fused brick cast by molten magnesia and chrome materials and fused rebounded brick made of molten magnesia and chrome materials by the brick making process.

The magnesia chrome brick has almost replaced the magnesia brick in the steelmaking and non-ferrous metal smelting industry. Since the chromium oxide (Cr2O3) can continue to spread, it is easy to pick up the coating. Therefore, in the last three decades, it is the preferred choice in the firing zone of cement kilns. However, since with the presence of water Cr3+ can be transferred into Cr6+ which can pollute water, it is gradually out of use in the cement industry. Compared to magnesia brick, it has better thermal stability and creep resistance and almost the same use to magnesia brick.

The magnesia chrome brick is mainly used in the metallurgical industry, such as open-hearth furnace roof, electrical furnace roof, refining furnace and various non-ferrous metal smelting furnaces. Fused brick can be used in the high temperature parts of UHP EAF furnace wall, while Magnesia chrome brick made of synthetic joint materials can be used in the severely eroded parts in the refining furnace. The both can also be used in the severely eroded parts of non-ferrous metal flash smelting furnaces. Besides, it can be used in the firing zone of cement kilns and the regenerator of glass furnaces.

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