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Microstructures and strength of microporous MgO-Mg(Al, Fe)2O4 refractory aggregates

2023; Elsevier BV; Volume: 43; Issue: 6 Linguagem: Inglês

10.1016/j.jeurceramsoc.2023.01.023

1873-619X

Qianlin Chen, Wen Yan, Stefan Schafföner, Han Wu, Bingqiang Han, Jinhua Zhang, Yawei Li,

Layered Double Hydroxides Synthesis and Applications

Microporous MgO-Mg(Al, Fe)2O4 refractory aggregates were prepared using magnesite, Al(OH)3 and Fe2O3 applying an in-situ decomposition synthesis method. At 1400–1600 °C, there was a Mg(Al, Fe)2O4 with Fe3+, which had two structures. One was a ring structure formed from Al(OH)3 pseudomorph particle as a template and a low content of Fe3+. The other was the dot and strip structures precipitated in magnesite pseudomorph particles with a high content of Fe3+. Besides, at 1550–1600 °C, microporous MgO-Mg(Al, Fe)2O4 refractory aggregates had an excellent compressive strength (75.8–81.5 MPa) and apparent porosity (26.8%−28.2%).