Erosion mechanism of tabular alumina of various microstructures under different basicity of blast furnace slag

摘要

In this study, three types of commercial tabular alumina aggregates with different microstructural characteristics were selected for corrosion tests on blast furnace slags with varying basicities. A corrosion mechanism with different microstructural characteristics is proposed, and the dominant microstructures in high- and low-basicity environments are evaluated. The pore structure was found to have a crucial influence on the dissolution of tabular alumina aggregates in the blast furnace slag. Under low-basicity (0.5-0.7) conditions, a small amount of clustered pore structure was beneficial for obtaining the maximum thickness (40-60 mu m) of the isolation layer between the tabular alumina aggregate and slag. Under high-basicity (0.9-1.1) conditions, the circular pore structure tended to form a uniform and stable double-layer isolation structure of calcium hexaaluminate and MgAl2O4 spinel.

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