Classification and application of magnesium-chromium bricks
appliance
Magnesium-chromium bricks have excellent resistance to slag erosion, high-temperature overheating damage, vacuum damage, oxidation reduction, abrasion and scouring. They are widely used in various high-quality steel refining furnaces (RH or DH vacuum degassing furnace, VOD ladle vacuum degassing furnace, AOD argon oxygen refining furnace, ultra-high-power electric furnace, etc.), large-scale non-ferrous metal smelting furnaces (flash furnace, converter, anode furnace, Kaldor furnace, etc.) of the working lining, hot spots, slag line area, wind eye area, scouring area and other vulnerable parts. Magnesium-chromium bricks are made of magnesium sand and chromite as the main raw materials, molded by high pressure and fired at high temperature.
categorization
Magnesium-chromium bricks are made of magnesium sand and chromite as the main raw materials, molded by high pressure and fired at high temperature. According to the use of different raw materials, divided into the following categories of products: re-bonded magnesium-chromium bricks, straight bonded magnesium-chromium bricks, semi-re-bonded magnesium-chromium bricks and silicate bonded magnesium-chromium bricks.
Recombined magnesium-chromium bricks:
electrofused magnesium-chromium sand as the main raw material, ultra-high-temperature firing and become. It has excellent antioxidant-reducing property, anti-overheating damage performance and abrasion-resistant scouring performance and good thermal shock stability. Especially widely used in vacuum smelting furnace (such as RH vacuum degassing device, VOD vacuum degassing ladle), argon and oxygen refining furnace (such as AOD refining converter), ultra-high-power electric furnaces, non-ferrous metal smelting furnaces and other critical parts with harsh working conditions, such as the working lining, hot spot area, slag line area, wind eye bricks, scouring area and other vulnerable parts.
Straight bonded magnesium-chromium bricks:
high purity magnesium sand and chromium concentrate as the main raw material, high temperature firing and become. It has excellent thermal shock stability, slag resistance, resistance to overheating damage and resistance to vacuum damage. Its service life is second only to that of re-combined magnesium-chromium bricks, but it is more economical. It is widely used as the working lining of iron and steel non-ferrous kilns. Also used as kiln lining bricks in chemical and paper industries.
Semi-reconjugated magnesium-chromium bricks:
electrofused magnesium-chromium synthetic sand and sintered magnesium sand, chromite or pre-reacted magnesium-chromium sand as the main raw materials, high-temperature firing. Thermal shock resistance is better than re-bonded magnesium-chromium bricks, with low porosity, high temperature strength, strong resistance to slag erosion performance and other characteristics. It is a kind of intermediate product which takes into account the performance of re-bonded magnesium-chromium brick and direct-bonded magnesium-chromium brick. It is widely used in the non-ferrous industry.
Silicate bonded magnesium-chromium bricks:
It is made of sintered magnesium sand and chromium ore as raw materials, which are matched according to the appropriate proportion and fired at high temperature. Silicate bonded magnesium-chromium bricks are better than magnesium bricks in thermal shock resistance, volume stability at high temperatures, and are widely used in flat furnaces, electric furnaces, non-ferrous metallurgical furnaces, cement rotary furnaces and glass kiln heat storage room. Silicate bonded magnesium-chromium bricks with high SiO2 content, poor erosion resistance at high temperatures, low strength, with the strengthening of the smelting of new processes continue to be used, the use of harsh conditions in parts, and gradually replaced by direct bonded products.
Zinfon Refractory Technology Co.,Ltd
We are a refractory material supplier integrating R&D,production,construction,warehousing and commerce.
We are offering various magnesia and alumina refractories including both shaped and unshaped products, raw materials and related chemical products.
We are certified to ISO9001, ISO14001, ISO45001 and other national and local certifications as follows: