HYDROMETALLURGY
·
2022
·
IF 4.217
Jie Tang,Guihua Liu,Tiangui Qi,Qiusheng Zhou,Zhihong Peng,Xiaobin Li,Yilin Wang,Leiting Shen,Jiaping Zhao,HongJie Hao
An understanding of the mechanisms of reactive Al and AlN in a sodium aluminate solution contributes to the safe and effective utilization of secondary aluminum dross (SAD). This study demonstrates that the slurry temperature increased exponentially with an increase in the SAD dosage. Synergistic kinetic phenomena in the form of a large dosage and high temperature occurred initially in relatively stable microbubbles and later in the slurry. The leaching efficiencies of pure Al and AlN powders were greater than that of Al and AlN in SAD, respectively. Meanwhile, the leaching rate became higher for Al in SAD but lower for AlN in SAD compared to that of pure Al and AlN powder. The AlN particles in SAD were covered by Al(OH) 3 precipitated from the saturated solution in the bubbles. As a result, the relatively stable microbubbles with a thick border accelerated the reaction of Al and AlN and produced a saturated solution thereby changing the leaching efficiency and leaching rate of AlN in SAD. The embedded Al and AlN grains in the SAD, relatively stable microbubbles, and the SAD particles covered by Al(OH) 3 , synergistically changed the leaching mechanism. These results provide further understanding of the reaction mechanism of rich bubbles and facilitate the optimization of the comprehensive utilization of SAD.
研究领域:
冶金学
·
材料科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jiamei Xu,Zijian Su,Jicheng Liu,Kun Lin,Yuanbo Zhang
With the improvement of industrial production requirements, the thermal shock resistance (TSR) of the materials used in industrial kilns plays a crucial role in ensuring efficient production. Aluminum-based heat storage ceramic balls (HSCB) are widely used in high-temperature industrial kilns, but they have a problem of weak TSR. A similar situation existed in the HSCB with corundum and Mg-Al spinel phases in our previous research. In this study, corundum-spinel-mullite HSCB was prepared using pre-treated secondary aluminum dross (SAD) as the main material at low roasting temperature. The effects of mullite content on the mechanical properties and microstructure of the HSCB were studied. Mullite whiskers were cross-distributed with corundum and Mg-Al spinel, which benefited the TSR. With the increase of mullite content, the structure of the HSCB gradually became loosely, the TSR increased and then decreased slightly, and linear crack density increased. When mullite content was about 25 %, the comprehensive performance of HSCB performed perfectly. Under the optimal conditions, the coefficient of thermal expansion of the HSCB was only 5.70 × 10 −6 K −1 , the thermal conductivity reached 3.35 W/(m·K) and the TSR was 34 times. This study aimed to provide a theoretical reference for the preparation of aluminum-based ceramic HSCB, as well as to improve the high-value utilization of SAD.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Bin Zhu,Haigang Feng,Xueyuan Zhu,Qiang Jin
As a hazardous waste, secondary aluminum dross (SAD) has troubled the aluminum industry for many years. The inefficient and incomplete hydrolysis of active aluminum components such as AlN, Al 4 C 3 , Al 2 S 3 , AlP in SAD was the main obstacle, which can react with water or even humid air to release toxic, harmful, flammable and odorous gases such as NH 3 , CH 4 , H 2 S, and PH 3 to the environment. In this study, a novel approach to prepare adsorbent was proposed by the deep hydrolysis of active aluminum components from SAD with the aid of grinding activation. High-energy grinding could increase the hydrolysis rate of AlN by ~30% and reduce the apparent activation energy of AlN hydrolysis by ~40 kJ⋅mol −1 in SAD. After grinding-leaching treatment, up to 94.3% AlN, and most of Al 4 C 3 , Al 2 S 3 and AlP were hydrolyzed and transformed into honeycomb boehmite (AlOOH). The leachability of F - , Cl - , NH 4 + , and heavy metals of the treated SAD was evaluated and met the specified requirements for pollution control. Moreover, adsorbent with uniformly covered active γ-alumina was prepared by roasting the harmless product at 600℃ for 2 h. The BET surface area and total pore volume of the as-prepared adsorbent reached 424 m 2 /g and 1.30 cm 3 /g, respectively, and the adsorption capacity of the adsorbent for F - reached 6.40 mg/g. Overall, the novel approach had the advantages of no additives, short process, and simple operation, which was expected to provide deep insights into the harmless treatment and reutilization of SAD.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2025
·Vol. 32
·期 5
·1079-1090
·
IF 7.2
Li Xiang,Zhu Nengwu,Xi Yunhao,Li Fei,Zhang Pengfei
Secondary aluminum dross (SAD) is a rich source of recyclable aluminum but poses considerable risk due to its high AlN content. Therefore, thoroughly removing AlN is essential, but intricate aluminum components and expensive additives pose challenges to the process. In this study, waste sodium acetate is proposed as an environmentally friendly additive for completely removing AlN and enhancing the extraction of aluminum from SAD. Through the exothermic decomposition of NaAc, reactions can occur at 850°C. AlN removal efficiency reached 93.19% after sintering, whereas Al leaching efficiency in the subsequent leaching process reached 90.49%, which were 37.86% and 375.26% higher than the removal efficiency of the control, respectively. These favorable results were attributed to the comprehensive transformation of aluminum species. The formation of soluble phase Na 1.95 Al 1.95 Si 0.05 O 4 occurred during the destruction of the Al 2 O 3 layer surrounding AlN and the transformation of other aluminum components. AlN decomposed upon contact with NaAc. Therefore, this study utilizes the decomposition properties of NaAc to provide an efficient and environmentally friendly route for removing AlN and extracting Al from SAD.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Siyuan Zhu,Jun Ke,Zhongnan Chen,Zhaoyang Yan,Lulu Zhao,Xinhong Qiu
Secondary aluminum dross (SAD) as a hazardous waste has been widely studied on recycling by acid leaching process, but residues accounting for approximately 50 wt% of SAD are still produced and rarely reused. In this study, residues from secondary aluminum dross are retrieved to fabricate Fe-based acidized aluminum ash sludge (FAS) heterojunction catalyst for photocatalytic degrading tetracycline hydrochloride under visible light, which does not only reduce resource utilization cost of SAD, but also realize efficient wastewater treatment by clean photocatalytic technique. Firstly, acidized sludge was obtained from SAD via an acid leaching and then utilized to fabricate FAS by calcination method. From the results of characterizations, BaFeO 3-x and Fe 2 O 3 were demonstrated to be deposited on the surface of acidized sludge, resulting in the successful formation of FAS heterojunction catalyst. As a result, the FAS exhibits an excellent performance in the removal of tetracycline hydrochloride (TCH), reaching to 92.2 % within 150 min under dark adsorption and visible light excitation. To further broaden the application of FAS in actual circumstance, the degradation of mixed dye in wastewater and actual medical wastewater were conducted over the optimal sample of FAS. After four cycles, the removal ability remained at 86.0 %, which shows the exceptional stability.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yuanbo Zhang,Jiamei Xu,Jicheng Liu,Kun Lin,Zijian Su
Secondary aluminum dross (SAD) is a kind of hazardous waste with high aluminum content produced in the aluminum industry. From another point, SAD is also considered as a valuable aluminum resource, which can be used as high-quality raw material for value-added products such as refractory materials . In this study, a novel route for preparing corundum-spinel heat storage spheres (HSS) using washed residue of secondary aluminum dross (WSAD) as the main raw material was proposed. FactSage 8.1 software was used for the detailed thermodynamic calculation, which provided accurate theoretical guidance for the actual synthesis experiments. The effects of roasting temperature and formula on the main phases, compressive strength , porosity, and bulk density of HSS were systematically analyzed. The strengthening mechanism of the liquid phase on the sintering strength was revealed. The results showed that the HSS with good properties could be obtained with 90 wt% WSAD, 10 wt% kaolin, and 1 wt% bentonite. The HSS mainly consisted of corundum and spinel phases. The synthetic temperature of corundum-spinel ceramic was reduced by more than 200 °C. This study provides a novel way for value-added utilization of SAD as well as realizing the deep detoxification and the removal of nitrogen of it.
研究领域:
材料科学
·
环境工程
·
冶金工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）