Yang Hong-Liang, Li Zi-Shen, Ding You-Dong, Ge Qi-Qi, Shi Yu-Juan, Jiang Lan
Key Laboratory for Ecological Metallurgy of Multimetallic Mineral, Ministry of Education, Northeastern University, Shenyang 110819, China.
School of Metallurgy, Northeastern University, Shenyang 110819, China.
Materials (Basel). 2022 Oct 16;15(20):7212. doi: 10.3390/ma15207212.
Aluminum dross (AD) is a waste product produced during aluminum processing and can be used to prepare mullite ceramic materials. However, the research on the preparation of mullite porous ceramics entirely from solid waste is still in the development stage. In this paper, porous mullite ceramics were successfully fabricated using a solid-phase sintering process with AD and different silicon sources (fly ash, silica dust, and gangue) as raw materials. The bulk density, apparent porosity, and compressive strength of the specimens were obtained, and the phase compositions and microstructures of the sintered specimens were measured using XRD and SEM, respectively. The average activation energy of the phase transition of fly ash, silica dust, and gangue as silicon sources were 984 kJ/mol, 1113 kJ/mol, and 741 kJ/mol, respectively. The microstructures of the mullite in the specimens were prisms, random aggregates, and needle-shaped, respectively. The formation of needle-shaped mullite combined with the substrate enhanced the mechanical strength of the porous mullite ceramics. The apparent porosity, density, and compressive strength of the specimens with gangue as the silicon source were 33.13%, 1.98 g/cm, and 147.84 MPa, respectively, when sintered at 1300 °C for 2 h.
铝灰（AD）是铝加工过程中产生的一种废弃物，可用于制备莫来石陶瓷材料。然而，完全利用固体废弃物制备莫来石多孔陶瓷的研究仍处于发展阶段。本文以铝灰和不同硅源（粉煤灰、硅灰和煤矸石）为原料，采用固相烧结工艺成功制备了多孔莫来石陶瓷。测定了试样的体积密度、显气孔率和抗压强度，并分别用XRD和SEM对烧结试样的相组成和微观结构进行了测定。以粉煤灰、硅灰和煤矸石为硅源时，相变的平均活化能分别为984 kJ/mol、1113 kJ/mol和741 kJ/mol。试样中莫来石的微观结构分别为棱柱体、无规聚集体和针状。针状莫来石与基体结合的形成提高了多孔莫来石陶瓷的机械强度。以煤矸石为硅源的试样在1300℃下烧结2 h时，显气孔率、密度和抗压强度分别为33.13%、1.98 g/cm和147.84 MPa。
