Abstract The dense (working) and porous (insulation) refractories are generally used for the lining of any kind of furnaces or kilns. The present investigation provides a new designed spinel (MgAl2O4)… Click to show full abstract
Abstract The dense (working) and porous (insulation) refractories are generally used for the lining of any kind of furnaces or kilns. The present investigation provides a new designed spinel (MgAl2O4) light weight refractory, which retains both working and insulation parts in a single specimen. The multi-layered refractories are fabricated by varying the amount of pore-forming agent (rice powder) and sintering aids (waste rice husk ash (RHA)) in the different layers. A porosity gradient is developed by the incorporation of intermediate layers in between the insulation and working layer. At 1550 °C with 3 h soaking sample retains good compressive strength (92.43 MPa), low apparent porosity (8.72%), good cement clinker corrosion resistance in the working layer along with reasonable strength (31.72 MPa), and low thermal conductivity (0.146 W/m·k) in the insulation layer. These promising results may encourage the refractory industries in developing the light weight multi-layered refractory for cement kiln.
               
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