Magnesia refractory
Jul 13, 2022
Alkaline refractories mainly include magnesia refractories, magnesia calcium (or magnesia-rich dolomite) refractories, dolomite refractories, forsterite refractories, magnesia chrome spinel refractories, magnesia aluminum tip Spar refractory material. At present, in addition to the small proportion of forsterite refractories used at home and abroad, other basic materials are widely used, but due to the environmental pollution problem of magnesia-chromium spinel materials, the proportion of use is gradually decreasing.
In the past 20 years, due to the advancement of smelting technology, refractory materials must have excellent high temperature properties, especially slag corrosion resistance and penetration properties. C series products, such as: MgO-C bricks, MgO-Ca0-C bricks, MgO-AI,O,-C bricks, etc., and the rapid development, wide application and excellent effect are difficult to compare with other materials . Alkaline refractories composed of MgO, CaO, or MgO-Ca0 bases are characterized by high refractoriness, good high temperature mechanical properties, and strong corrosion resistance to alkaline slag and iron slag. It has been widely used in converters (especially oxygen re-blowing converters), electric furnaces, out-of-furnace refining, ladle, non-ferrous metal smelting, cement and other industrial fields. In addition to the above properties, CaO also has the functions of removing phosphorus, sulfur and purifying molten steel. With the growth of demand for clean steel and variety steel, this kind of refractory material has become the focus of attention.
Generally speaking, magnesia refractory material refers to basic refractory material with w(MgO) not less than 80% and periclase as the main crystal phase. Common magnesia bricks, high-purity magnesia bricks, molten recombined magnesia bricks, and C2S combined magnesia bricks belong to this type of refractory material. Metallurgical magnesia is directly used in metallurgical furnaces or other devices as a product. It should also belong to the category of magnesia refractory materials, but the application scope of this product is narrow. Magnesia refractories have been widely used in open hearth side walls, regenerators, electric furnace side walls, SKF molten pools outside the furnace, electromagnetic stirring areas, slag lines, and also used in VAD, LF furnace molten pools and slag lines. Replaced by MgO-C material or magnesia-chromium material. Judging from the current situation, the development of magnesia refractories is becoming more and more bleak compared with other materials, especially ordinary magnesia bricks, C2S combined magnesia bricks, etc., but the magnesia raw materials used are increasingly developing in the direction of high purity and high density, which is highly favored by refractory materials at home and abroad. The basic reason for the attention of workers is that it is the basis for the production of various high-quality alkaline refractories.
Refractory materials are widely used in chemical, petroleum, metallurgy, silicate, machinery manufacturing, power and other industrial fields. Magnesia refractory has become one of the widely used auxiliary materials in the metallurgical industry due to its high refractory performance, high temperature strength and resistance to alkaline slag corrosion. For example, the steelmaking process mainly relies on slag to remove harmful impurities (the main components of the slag are CaO, FeO, etc. or the highly alkaline CaO-slag system). In order to resist the erosion of these slag and absorb harmful impurities in steel, and smelt clean steel, only basic magnesia refractory materials are the most suitable; low-viscosity slag (silicon oxide, iron oxide) is produced during the pyrometallurgical smelting process of non-ferrous heavy metals. , non-ferrous metals and sulfides, etc.), to resist the erosion of these slag, it is also inseparable from magnesia refractory materials. The main factor affecting the performance of magnesia refractory is its chemical composition.
In the past 20 years, due to the advancement of smelting technology, refractory materials must have excellent high temperature properties, especially slag corrosion resistance and penetration properties. C series products, such as: MgO-C bricks, MgO-Ca0-C bricks, MgO-AI,O,-C bricks, etc., and the rapid development, wide application and excellent effect are difficult to compare with other materials . Alkaline refractories composed of MgO, CaO, or MgO-Ca0 bases are characterized by high refractoriness, good high temperature mechanical properties, and strong corrosion resistance to alkaline slag and iron slag. It has been widely used in converters (especially oxygen re-blowing converters), electric furnaces, out-of-furnace refining, ladle, non-ferrous metal smelting, cement and other industrial fields. In addition to the above properties, CaO also has the functions of removing phosphorus, sulfur and purifying molten steel. With the growth of demand for clean steel and variety steel, this kind of refractory material has become the focus of attention.
Generally speaking, magnesia refractory material refers to basic refractory material with w(MgO) not less than 80% and periclase as the main crystal phase. Common magnesia bricks, high-purity magnesia bricks, molten recombined magnesia bricks, and C2S combined magnesia bricks belong to this type of refractory material. Metallurgical magnesia is directly used in metallurgical furnaces or other devices as a product. It should also belong to the category of magnesia refractory materials, but the application scope of this product is narrow. Magnesia refractories have been widely used in open hearth side walls, regenerators, electric furnace side walls, SKF molten pools outside the furnace, electromagnetic stirring areas, slag lines, and also used in VAD, LF furnace molten pools and slag lines. Replaced by MgO-C material or magnesia-chromium material. Judging from the current situation, the development of magnesia refractories is becoming more and more bleak compared with other materials, especially ordinary magnesia bricks, C2S combined magnesia bricks, etc., but the magnesia raw materials used are increasingly developing in the direction of high purity and high density, which is highly favored by refractory materials at home and abroad. The basic reason for the attention of workers is that it is the basis for the production of various high-quality alkaline refractories.
Refractory materials are widely used in chemical, petroleum, metallurgy, silicate, machinery manufacturing, power and other industrial fields. Magnesia refractory has become one of the widely used auxiliary materials in the metallurgical industry due to its high refractory performance, high temperature strength and resistance to alkaline slag corrosion. For example, the steelmaking process mainly relies on slag to remove harmful impurities (the main components of the slag are CaO, FeO, etc. or the highly alkaline CaO-slag system). In order to resist the erosion of these slag and absorb harmful impurities in steel, and smelt clean steel, only basic magnesia refractory materials are the most suitable; low-viscosity slag (silicon oxide, iron oxide) is produced during the pyrometallurgical smelting process of non-ferrous heavy metals. , non-ferrous metals and sulfides, etc.), to resist the erosion of these slag, it is also inseparable from magnesia refractory materials. The main factor affecting the performance of magnesia refractory is its chemical composition.
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