Common SK series low cement and high aluminum castable refractory are SK30, SK32, SK34, SK35, SK36, SK37, SK38, and SK40. The comparison is that the alumina content of my country is 30%, 35%, 38%, 45%, 55%. , 65%, 70%, 82% of the castable unshaped refractory material-low cement and high aluminum castable.
The difference between sk-36 low-cement and high-aluminum castable refractories and general refractory castables is that the low-cement, very low-cement cultivation substrate is used for the same or similar superfine powder of the main material of the castable (low particle size distribution) 1μm) instead of a part or most of the calcium aluminate cement, in addition, it is equipped with a microanalysis dispersant (additive) and a certain amount of late-acting coagulant.
The raw materials of low cement and very low cement castables are: refractory materials, fireproof granular materials, appropriate ultrafine powder, appropriate or small amount of calcium aluminate cement (late-acting polycinnamyl alcohol) and microanalysis dispersant (high-efficiency degelling agent) ). The composition of particle size distribution stipulates that multi-level raw materials are selected, divided into 5~3mm, 3~1mm, 1~0.2mm, 0.2~0.074mm, 0.074~0.044mm and μm. The proportion of different particle size distribution can be based on the Furness raw material curve.
The application temperature of low cement and very low cement castables is higher than that of general refractory castables of the same material. Clay and high alumina low cement castables can be used to line various heating furnace machinery such as heat treatment furnaces and soaking furnaces. Mullite-based low-cement castables can be used for linings of various high-temperature burners, lining linings of water-cooled radiating pipes of heat treatment furnaces, etc. Corundum and chromium-containing corundum low-cement refractory castables can be used for the lining of some components of the refining equipment outside the molten steel furnace, such as the lining of the general spray gun for the spouting metallurgical industry, the lining of the immersion tube of the RH or DH vacuum pump degassing device, It can also be used as the lining of direct current induction heating furnace, the high temperature and abrasion resistant lining of the catalytic cracking tubular reactor of petrochemical equipment, etc.
Al2O3-SiC-C low-cement castables can be used as linings for iron-making blast furnace tapping troughs, iron-making furnaces tapping troughs, and overall powder spray guns for hot metal preparation; MgO-Al2O3 quality or Al2O3-MgO·Al2O3 High-quality low-cement castables can be used as linings for steel drums and tapping troughs.
