Corundum castables' integral casting process can effectively address desulfurization smelting process issues, including steel penetration into ring pipes and brick defects in impregnated pipework.
Corundum castables have long been utilized as prefabricated blocks, and more recently in Japan they've also been utilized in impregnated pipes. One advantage of using castables for impregnated pipe construction is that pipe bodies made up of prefabricated parts can be assembled as one whole while joints between bricks are structurally eliminated; this helps avoid steel seepage in working layers as well as bricks falling off lower ports of the impregnated pipe body.
Corundum castable's primary materials include white corundum, aluminum-rich spinel ultrafine powder and spinel. Aluminum-rich spinel ultrafine powder is used as a matrix binding material to facilitate sintering, with an approximate mass fraction of 7 being ideal for this application. As such, this material demonstrates excellent resistance against steel erosion, thermal shock resistance, steel slag erosion resistance as well as volume stability at high temperatures to prevent cracking or peeling in actual use. In terms of desulfurization resistance it surpasses magnesia-chrome bricks while service life should still remain equivalent in other cases.
Addition of 2030 magnesia-aluminum spinel into corundum material has proven effective at improving thermal shock resistance and slag penetration, creating high-quality ladle material suitable for various applications. Magnesia-aluminum spinel granules or fine powders may be created using in-situ reaction methods to add light-burned magnesium oxide fine powder; when casting corundum magnesia spinel castables aluminum-rich spinel powders are typically utilized.
Spinel contains between 58-90% Al2O3, and 9-15% MgO; various varieties have different amounts of aluminum and magnesium respectively; this indicates that its Al2O3 and MgO concentrations may range between 90-15% respectively. In this example, the mass ratio between fused corundum powder and fused magnesia powder is 2.57. However, the amount of cement and fused corundum aggregate remains unchanged, so its mass ratio does not remain constant over time. You should adjust spinel powder according to need as time progresses. Sintered spinel powder of this composition contains Al2O3 levels of 59.1 and MgO levels of 32.14. Materials, matrix composition and mix ratio remain the same when producing cement corundum magnesia spinel refractory castable, using spinel powder with different particle sizes to prepare the castable. As particle sizes reduce further the castable's erosion resistance increases while its flexural permeability resistance also improves.
Spinel ultrafine powder with high activity can react easily with CaO and FeO in the slag to form low-melting materials that gradually dissolve, speeding up melting loss; at the same time, its addition consumes it. When added together with CaO and FeO addition, these materials become newly attached at the interface between castable and slag and prevent it from penetrating into it; hence extending service life of corundum spinel castables. Essentially, its dosage and particle size of alumina-magnesium spinel castables.
Tests were performed using corundum spinel refractory castable prefabricated parts made of corundum spinel to construct the walls of a lower trough, and it was discovered that aside from melting corrosion at the point of impact of molten steel onto the front of the down pipe, loss rate for chromium-free materials was only slightly greater than magnesia-chrome bricks in most instances; and hot surface of used chromium-free material is flat without structural peeling or thermal peeling and the layer deterioration is thin compared with magnesia-chrome bricks used.
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