Magnesia Brick
Magnesia refractory brick is a refractory material with magnesite, seawater magnesia sand, and dolomite as raw materials, magnesite as the main crystalline phase, and magnesium oxide content above 80%.
It is an alkaline refractory material. Magnesia refractory material is one of the widely used auxiliary materials in the metallurgical industry because of its high refractory performance, high-temperature strength, and resistance to alkaline slag leaching.
The load softening point and thermal shock resistance of high purity magnesia bricks are much better than the general magnesia bricks. High refractories, good resistance to alkaline slag, and iron slag are important high-grade refractory materials.
PER company, as a professional refractory brick manufacturer w Chinach, can provide you with lower prices than the market. Contact us now to get the latest price list of magnesia refractory bricks.
Types And Characteristics Of Magnesia Refractory Bricks
Magnesia refractory brick products are mostly produced by the sintering method, the firing temperature is generally between 1500~1800℃, in addition, a chemical bonding agent can also be added to make non-burning bricks and indefinite refractory materials. PER refractory magnesia bricks mainly used in flat furnaces, electric furnaces, oxidation converters, non-ferrous metal smelting furnaces, piece cementowe, alkaline refractory calcining kilns, itp.
These products can be divided into two categories: metallurgical magnesia and magnesia products. According to the chemical composition and use can be divided into metallurgical magnesium sand, cegły magnezowe, magnesium silicon bricks, magnesium aluminum bricks, magnesium calcium bricks, magnesium carbon bricks, and other varieties. Its performance is greatly affected by the CaO/SiO2 ratio and impurities.
Magnesium Brick
The most important brick in alkaline refractories, is high refractoriness, good resistance to erosion of iron oxides, alkaline slag, and high calcium melt.
Magnesium brick has fired magnesium brick and not burned magnesium brick, fired magnesium brick firing temperature is generally 1550-1600 ℃, high purity brick firing temperature of 1750 ℃, or even higher.
Magnesium bricks are widely used in steelmaking furnace linings, ferroalloy furnaces, iron mixing furnaces, non-ferrous metallurgical industrial furnaces, lime kilns, tunnel kilns and so on in the iron and steel industry.
Magnesium Carbon Brick
Magnesia carbon brick is made of high melting point alkaline oxide magnesium oxide (melting point 2800℃) and high melting point carbon material which is difficult to be infiltrated by slag as raw material. Add a variety of non-oxide additives, with carbon binding agents combined from the non-burning carbon composite refractories.
Magnesium-carbon bricks are mainly used for the inner lining of the converter, AC arc furnace, DC arc furnace, slag line of ladle, i inne części. Magnesium carbon brick as a composite refractory material, effective use of magnesium sand slag erosion resistance, and carbon’s high thermal conductivity and low expansion compensate for the magnesium sand spalling resistance of the biggest shortcomings.
Cegła magnezowo-aluminiowa
W porównaniu z cegłą magnezową, cegła magnezowo-aluminiowa ma dobrą odporność na szybkie zamrażanie i szybkie nagrzewanie oraz może wytrzymać chłodzenie wodą 2025 czasy, lub nawet więcej razy, co jest wyjątkową zaletą cegły magnezowo-aluminiowej.
Ogniotrwałość cegieł magnezowo-aluminiowych przekracza 2000 ℃, odporność na szybkie chłodzenie i nagrzewanie jest lepsza niż cegieł magnezowych, i może wytrzymać erozję alkalicznego żużla. Stosowany jest do budowy dachów alkalicznych pieców płaskich i pieców elektrycznych do hutnictwa stali.
Magnesium Calcium Brick
Magnesite is the main mineral composition, with tricalcium silicate and dicalcium silicate as a combination.
In addition to poor thermal shock stability, other performance indicators than magnesium brick are superior.
Magnesium-calcium bricks are mainly used as the lining of AOD furnace for smelting stainless steel and the cladding of VOD ladle. Replacing the original magnesium-chromium brick, it is the most important magnesium-calcium refractory material.
Magnesium Silicon Brick
Square magnesite is the main mineral composition, with magnesia olivine as a matrix bond.
Its performance and magnesium brick are roughly the same.
But the load softening temperature is higher than magnesium brick, and slag resistance is also better.
Magnesium-silica bricks are mainly used in steel rolling furnace, heating furnace bottom, but also used as glass kiln heat storage room lattice brick, itp.
Technical Index
| Product performance | Alumina magnesia carbon brick | Magnesia aluminum carbon brick | Magnesia carbon brick | ||||
| chemical composition (%)≥ | AL2O3 | 65 | 70 | 10 | 15 | ||
| Mg0 | 15 | 10 | 75 | 70 | 78 | 74 | |
| C | 7 | 7 | 10 | 8 | 10 | 14 | |
| Apparent porosity（%） ≤ | 5 | 5 | 3 | 3 | 3 | 3 | |
| Bulk density (g/cm³)≥ | 3 | 3 | 3 | 3 | 3 | 2.9 | |
| Wytrzymałość na ściskanie w normalnej temperaturze (MPa)≥ | 40 | 40 | 40 | 40 | 40 | 40 | |
| High temperature flexural strength(MPa)≥(1400℃×0.5h) | 6 | 6 | 7 | 7 | 6 | 8 | |
| Application | molten pool, bottom of ladle | molten pool | slag line | ||||
The Difference Between High Alumina Brick And Magnesium Brick
High alumina brick is a series of aluminum and silicon products, and magnesium brick is a series of magnesium products.
High alumina brick can resist weak alkali and weak acid atmosphere and is a neutral product. Magnesium brick resists strong alkali erosion, cannot be used in an acid atmosphere and belongs to alkaline series products.
High alumina brick and magnesium bricks are two different materials and the nature of refractory products, magnesium brick density is above 3.0, melting point at 2850℃, high alumina brick density is above 2.3, melting point at 1500℃.
Magnesium Bricks
1. The refractories of magnesium brick is more than 2000℃, and the load soft is at 1800℃.
2. But magnesium brick has high thermal conductivity, poor thermal shock resistance, and a high degree of heat resistance.
3. Magnesium brick's resistance to acidic slag is poor, and can not directly contact acidic products.
4. If the acid is in the kiln lining, use high alumina brick will be separated from it to use.
5. And the magnesium brick's resistance to hydration is poor, easy to meet the water long white hair, but also produces cracks, strength reduced.
6. Magnesium brick in storage and transportation during all to prevent moisture, rain, and snow.
Cegły o wysokiej zawartości tlenku glinu
1. The refractories of high alumina brick are above 1700℃.
2. Load softening temperature at 1520 ℃, the highest does not exceed 1600 ℃.
3. The load softening temperature of high alumina brick is also very different according to different grades of raw materials.
4. The third-grade high alumina brick load softening temperature is also at 1410℃ or so.
5. Although high alumina brick is neutral brick, thermal shock stability is good, not afraid of hydration, and can be used in weak alkali, weak acidic atmosphere.
Summarize
So in different kiln linings of different temperatures, the choice of magnesium brick or high alumina brick is according to the degree of erosion and atmosphere selected. The alkaline atmosphere must choose magnesium brick. Using a temperature below 1400 ℃, weak alkali or weak acid atmosphere can choose high alumina brick.
The difference between high alumina brick and magnesium brick is that the material is different, the use temperature is different, the erosion-resistant atmosphere is different, and the thermal shock effect is different. Another difference is the market price, high alumina brick price is low, and magnesium brick price is high. Oczywiście, as a professional refractory material supplier with many years of manufacturing and exporting experience, we can offer you a lower price than the market price.
O firmie PER materiałów ogniotrwałych
Firma materiałów ogniotrwałych PER znajduje się w mieście Xinmi, Prowincja Henan, rodzinne miasto materiałów ogniotrwałych w Chinach. Nasza firma jest opartym na technologii przedsiębiorstwem zajmującym się materiałami ogniotrwałymi, integrującym R&D, produkcja, obroty, i serwis techniczny. Bogate zasoby i doskonała jakość na tym terytorium zapewniają niezrównane, doskonałe warunki do produkcji materiałów ogniotrwałych. Naszymi głównymi produktami są cegły ogniotrwałe, cegły ogniotrwałe o wysokiej zawartości tlenku glinu, silica refractory bricks, cegły ogniotrwałe magnezowe, cegły mulitowe, cegły izolacyjne, i inne produkty odporne na wysokie temperatury.
Firma PER materiał ogniotrwały jest bazą produkcyjną surowca zielonego, oszczędzanie energii, i przyjazne dla środowiska nowe materiały ogniotrwałe. Nasza firma przeszła ISO9001:2008 międzynarodowy certyfikat systemu jakości i GB/T24001-2004 / ISO14001:2004 certyfikacja systemu zarządzania środowiskowego, certyfikacja agencji kontroli jakości w przedsiębiorstwie. Nasze produkty są dobrze sprzedawane w ponad 20 krajów na całym świecie. Są preferowani produkty ogniotrwałe dla metalurgii, nieżelazne, petrochemiczny, szkło, ceramika, i innych gałęziach przemysłu materiałów ogniotrwałych.
