材料科学
动能
铝
热力学
相(物质)
冶金
物理
经典力学
量子力学
作者
Junjie Zhang,Bo Liu,Hanlin Shen,Quan Wen,Ying Liu,Jun Liu,Shengen Zhang
标识
DOI:10.1016/j.jmrt.2022.06.105
摘要
As a kind of hazardous solid waste, the resource utilization of secondary aluminum ash (SAA) has become a worldwide challenge. The powdered Al and AlN contained in SAA will release a significant amount of heat during thermal treatment, making SAA have the potential to be used as a secondary energy resource. The thermogravimetric analysis (TG/DTG) coupled to a Fourier transform infrared spectrometer (FTIR) was carried out to evaluate the thermal degradation behavior and thermodynamic of SAA from room temperature to 1300 °C at three different heating rates (5, 10, 20 °C/min). The activation energy was calculated by model-free methods, showing that the activation energy of SAA during pyrolysis ranged from 39.99 to 552.3 kJ/mol for conversion rate (α) = 0.1–0.4. The FTIR results displayed gas products including O–H, C–H, N–H, and N=O groups. The increase in temperature from 1100 °C to 1500 °C will make the phase intensity of chloride and AlN gradually decrease, while the Al 2 O 3 is opposite. However, submicron-sized aggregates can still be observed in the sintered samples at 1100 °C and 1200 °C. After calcination at 1500 °C for 3 h, the micro morphology of SAA is basically dominated by large granular Al 2 O 3 and spinel, which verifies the possibility of slag as the raw material for ceramics and refractories. This research provides a novel idea of employing SAA as a secondary energy resource as well as the theoretical basis data on thermodynamics.
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