Directly bonded magnesium chromium bricks:
The main difference between the production process of directly combining magnesium chromium bricks and ordinary magnesium chromium bricks is that the former uses raw materials with low impurity content and is fired at relatively high temperatures.
Magnesia sand used for producing directly bonded magnesia chromium bricks, with a MgO mass fraction generally greater than 95% and greater than 97%, and a particle volume density of 3.25g/cm³ The SiO₂ mass fraction in chromium ore is generally limited to less than 3%, and when using chromium concentrate, the SiO₂ mass fraction can be less than 1.0%.
According to different needs and uses, sometimes 1-2 types of magnesia and 1-2 types of chromium ore can be selected for batching.
Cement kilns use directly bonded magnesia chromium bricks, usually using magnesia as fine powder and some granular materials, while using chromium ore as granular material, with a Cr₂O₃ mass fraction of 3% to 14%;
Direct bonded magnesia chromium bricks used as metallurgical furnace lining sometimes require a higher mass fraction of Cr₃O₂ (such as 20%). When using pure magnesia sand and chromium ore co ground fine powder as the substrate, the product often undergoes expansion during firing.
Directly bonded magnesia chrome bricks generally refer to products made from chromium ore with low impurity content and pure magnesia sand, fired at temperatures above 1700 ℃. The refractory grains are mostly in direct contact.
In the chemical composition of directly bonded magnesium chromium bricks, there are fewer impurities, and the direct bonding rate between refractory grains is high, resulting in good slag resistance and high-temperature performance.
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