The layers were cut into pieces of a certain size, and their bulk density and apparent porosity were measured. The layers were polished and subjected to SEM and EDAX analysis. Samples of the polished sheet were impregnated with epoxy resin and ground and polished with anhydrous alcohol to avoid the loss of solubles. In addition, sections of each layer were ground and passed through a 0.088 mm sieve and subjected to XRD analysis.
From the appearance of the post-use magnesium-alumina spinel bricks, it can be seen that there is a layer of kiln skin with uneven thickness on the hot surface of the brick, and the thickest part is about 1 mm. The kiln skin is light gray and adheres loosely to the surface of the brick. Due to the spalling of the hot surface layer, the surface of the sample has become uneven. The observation of the side of the sample revealed that the hot surface was loose near the hot surface, there was a rough crack parallel to the hot surface at about 15mm from the hot surface, and there was another obvious crack parallel to the hot surface at about 40mm from the hot surface. It can be inferred that the damage of the magnesia-alumina spinel bricks is dominated by thermal exfoliation or structural exfoliation. This damage will result in a sudden exfoliation of tens of millimeters or even tens of millimeters of the refractory material, and therefore has a great influence on the life of the lining.
The results of the determination of the volume density and apparent porosity of each layer after the apparent porosity and bulk density were used. It can be seen that the volume density of each layer of the post-MgAl2O3 spinel brick is larger than that of the original brick, and the apparent porosity is smaller than that of the original brick. This may be due to the infiltration of the liquid phase of the clinker (loose layer) and the deposition of alkaline salts (transitional and quasi-brick layers).
A very small amount of chromatographic workstations for C2S and C3S chromatography appeared in the loose brick layer, which was caused by the direct contact of the layer with the cement clinker and the infiltration of CaO and SiO2 in the liquid phase of the clinker into the brick.
In the residual brick transition layer, the contents of K2SO4 and KCl have increased. This shows that the alkaline salt in the remnant brick is dominated by K2SO4 and KCl. The alkali salt that invades the magnesia-alumina spinel brick does not react with the phases in the brick, but enters the open pores of the brick through liquid-phase infiltration or vapor deposition to densify the structure of the brick. No phase, such as C2S and C3S, was detected in this layer, indicating that there is no intrusion or intrusion of CaO and SiO2 in the transition layer. This shows that the alkali salt is mainly deposited at 4080 mm from the hot surface. This is consistent with the physical property test results of the residual bricks after use. The hot surface of post-MgAl2O4 spinel bricks for SEM and EDAX analysis has almost no kiln skin, and the thickest one is only about 1 mm. The kiln skin of the post-MgAl2O3 spinel brick surface observed under the electron microscope.
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