| Citation: |
MA Wenqing, LI Canhua, DU Gang, LI Jiamao, LI Minghui. Preparation of aluminate cement by using the secondary aluminum ash as a partial substitute for alumina[J]. Nonferrous Metals Science and Engineering, 2024, 15(4): 527-534. DOI: 10.13264/j.cnki.ysjskx.2024.04.007
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In response to the scarcity and high cost of bauxite, a raw material for aluminate cement, this study explored the feasibility of preparing aluminum cement by using secondary aluminum ash as a substitute for bauxite. The calcination experiment results showed that the optimal preparation conditions were an Al2O3 content of 60%, a calcination temperature of 1 350 ℃, and an insulation time of 1 h. The aluminate cement samples were mixed with standard sand for natural curing. SEM and EDS analysis were conducted on the hydrated aluminate cement samples at 3 and 28 d, respectively. Under these conditions, the mineral phases obtained in the aluminate cement clinker were dicalcium aluminate, gehlenite, and a small amount of tricalcium aluminate. The compressive strength of the aluminate cement hydrated for 28 d reached 85.5 MPa, and the flexural strength 11.5 MPa, proving that the secondary alumina ash can be used as a partial substitute for bauxite to prepare aluminate cement.
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