wanhaorefractory

Magnesium carbon brick are alkaline refractory materials, the alkali slag has a strong resistance, but can not resist the erosion of acidic slag, at 1600 ℃ high temperature, and silicon brick, fire clay brick or even high alumina brick contact can react. MgO melting point of up to 2800 ℃, magnesium brick refractoriness above 2000 ℃, but its load softening point is very low, only 1500-1550 ℃. This is because the magnesite is surrounded by low melting point of calcium forsterite (CaO · MgO · SiO2) and glass phase bonded, and the magnesite does not form a continuous crystallization network, the load deformation temperature is very low, and start Softening to 40% deformation of the temperature interval is very small, only 30-50 ℃. Magnesium carbon brick of the thermal stability is also poor, in the rapid quenching and cooling is easy to crack, which is an important reason for the damage of magnesia bricks. In the furnace and the soaking furnace, the magnesia bricks ar...

Refractory castable construction requirements: 1. Winter construction refers to the ambient temperature at +5 ℃ ~ -5 ℃ when the construction. The temperature below -5 ℃ when only the adoption of a reliable anti-cold measures after the construction of gas. 2. Winter construction must refer to winter construction skills initiatives. To do a good job on the work environment of the block, the wind, heating and warm work, to keep the masonry after the temperature of +5 ℃. 3. During the winter construction of castable material, the dry material should be stored in the heating room, and with water spices, mixing material temperature maintained at 10 ℃ or more. Loss of additional chemical accelerator or antifreeze. 4. Winter in the furnace construction, the first insulation layer should be good to mobilize the refractory layer of anti-freeze ability. After construction, masonry covered with plastic sheeting, and then covered with dried vegetables. On the new puzzle kiln, the ...

The magnesia-calcium brick, also known as high calcium magnesite brick, is a kind of magnesial refractory material with periclase as principal crystalline phase and tricalcium silicate as secondary phase. It contains 80 % ~ 87% MgO, 6 % ~ 9% CaO, CaO/SiO2 ratio is between 2.2 ~ 3.0. Its significant structural feature is periclase directly contact with dicalcium silicate and tricalcium silicate, making eutectic solution-4 Cao·Al2O3·Fe2O3 fill into crystal gap between dicalcium silicate and tricalcium silicate. Its porosity is low, the refractoriness under load is higher than 1700 ℃. It has good alkaline slag resistance ability, but with poor thermal shock resistance. Made by calcium magnesia sand as refractory raw material , it will be made by firing at 1550~1600 ℃ after crushing, burdening, mixing and molding. It will be used at eye place of side-blown converter, top place of open-hearth furnace and oxygen-blown converter etc. Magnesia-calcium brick has seven pr...

1.High bulk density and high melting point. Proper sintering between granules under high temperature, but the sintering layer should be thin. High bulk density and proper sintering could keep nozzle filling compound from being scattered and floating into molten steel. 2.Good high temperature chemical stability, no chemical reaction with ladle nozzle , good corrosion resistance and non-wettability to molten steel and slag. 3.Proper granularity. If the granules are too big, molten steel could penetrate into the gaps between them, if too small, the granules could be integrated under high temperature. 4.Natural repose angle should be as small as possible, surface of granules should be smooth and evasive to create good fluidity, which could prevent arching inside the nozzle. 5.Moisture content should be less than 0.5%. Article Source:  The properties requirements on nozzle filling compound Company name: Wanhao Refractory Email: sales100@wanhaorefractory.c...

The properties of magnesia are classified into chemical and physical properties.The chemical properties of magnesia sand is mainly refer to the periclase.  Mgo is the main component in the periclase. Periclase is one of the most common minerals in cement clinker. It can coexist with four kinds of main mineral C3S, C2S, C3A, C4AF in the cement clinker. So periclase has good erosion resistance against cement clinker. （1）Periclase has very high melting point so that the magnesia refractories are charactorized with good high-temperature resistance. （2）Periclase has good thermal conductivity. When using high mgo content refractory , and the kiln skin can not be hung, the surface temperature of kiln body will raise. At that time, not only it will cause a great loss of heat dissipation, but also easy to burn the cylinder. （3）Periclase has high thermal conductivity. So that the thermal shock resistance for magnesia refractories are not enough. In the process of using, t...

More and more steel plants are using tundish exhangeable sizing nozzle recently. Compared with traditional sizing nozzle , the advantages of exchangeable nozzle are: 1.Simple structure, reliable performace, easy to operate. 2.Adopt single tube oil passage control, light cylinder, easy to handle and operate, only one button required for control. 3.The rack and base of cylinder are intergrated, which makes the positioning of slide block precise. 4.The cover of lower slide block is made from cast iron, the coordination of lower slide block and machined face of platen is with high precision, which could avoid leakage accident caused by the unqualification of alide block size. Article Source:  The advantages of tundish exchangeable nozzle Company name: Wanhao Refractory Email: sales100@wanhaorefractory.com Website: http://www.wanhaorefractory.com/

During continuous casting, the casting powder is mostly used (together with submerge nozzle) except from casting billets with small section. Practice has proved that this process is one of the important conditions to ensure the quality and normal operation of casting billet. In the early 1970s, the process was successfully applied to slab continuous casting in our country and solved the problem of slab longitudinal crack, and then was gradually popularized and applied. In recent years, a series of protective slag has been established, Some special fluxes for continuous casting of special steel are developed, which provide necessary conditions for further development of continuous casting in China. There have many kinds of refractory products in our factory. Function of mold fluxes : 1 Insulation 2 Isolating air and preventing molten steel from oxidizing two times 3 Purify the slag interface and absorb the inclusions in molten steel 4 Lubrication shell an...