A thermodynamic and kinetic study of catalyzed hydrolysis of aluminum nitride in secondary aluminum dross

Lv, Han; Zhao, Hongliang; Zuo, Zhiyuan; Li, Rongbin; Liu, Fengqin

doi:10.1016/j.jmrt.2020.06.051

Cited by 53 publications

(16 citation statements)

References 26 publications

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“…The content of AlN was calculated by measuring the amount of ammonia. 30 The chemical composition of the EAD before and after denitrification shows that the N element was effectively removed after the leaching process. Therefore, the Al and O elements in the denitrified EAD were further enriched.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

“…After leaching pretreatment, the removal efficiency of AlN in EAD reached 96.24%. 30 The XRD pattern and chemical composition results of EAD and denitrified EAD are shown in Figure 2 and Table 1. The phase composition difference of the EAD before and after denitrification was evident from the XRD pattern, as the AlN peak disappeared and the Al(OH) 3 peak appeared, indicating that most of AlN was hydrolyzed into Al(OH) 3 .…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

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A Denitrification-Phase Transition and Protection Rings (DPP) Process for Recycling Electrolytic Aluminum Dross

Liu

Zuo

et al. 2021

ACS Sustainable Chem. Eng.

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The continuous growth of the aluminum electrolysis industry has produced large amounts of electrolytic aluminum dross (EAD) as a waste product, which lacks proper recycling methods and poses serious environmental pollution risks. A short and clean process for recycling EAD is proposed involving the preparation of anode protection rings, which can effectively reduce the corrosion of anode steel stubs, improve the quality of molten aluminum, and return to aluminum reduction cells for recycling alumina and fluoride after being broken. The phase transition path of Al(OH) 3 in denitrified EAD by thermal decomposition was bayerite → boehmite → γ-Al 2 O 3 → α-Al 2 O 3 . The calcination temperature should be controlled at 600−800 °C for 2 h to obtain a higher content of activated γ-Al 2 O 3 . The average dissolution rate of denitrified EAD in the aluminum electrolyte was 7.33 times higher than that before denitrification treatment. After using EAD anode protection rings, the corrosion rate of anode steel stubs decreased by 67.7% on average. Furthermore, the iron and silicon contents in the molten aluminum were reduced by 18.57% and 6.25%, respectively. The alumina consumption for producing primary aluminum was reduced by 8.14 kg•t −1 . The experimental results suggest that the proposed process is economical and promising for EAD recycling.

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Section: ■ Experimental Sectionmentioning

confidence: 99%

Section: ■ Experimental Sectionmentioning

confidence: 99%

A Denitrification-Phase Transition and Protection Rings (DPP) Process for Recycling Electrolytic Aluminum Dross

Liu

Zuo

et al. 2021

ACS Sustainable Chem. Eng.

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“…It is widely accepted that, in the solution, due to the hydrolysis of aluminum ions [40][41][42]. A1 3+ + 3H 2 O = Al(OH) 3 + 3H + , the pH of the solution will drop.…”

Section: The Influential Factors 261 Solution Environmentmentioning

confidence: 99%

Analysis of Hydrogen Embrittlement on Aluminum Alloys for Vehicle-Mounted Hydrogen Storage Tanks: A Review

Chen

Zhao

et al. 2021

Metals

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High-pressure hydrogen tanks which are composed of an aluminum alloy liner and a carbon fiber wound layer are currently the most popular means to store hydrogen on vehicles. Nevertheless, the aluminum alloy is easily affected by high-pressure hydrogen, which leads to the appearance of hydrogen embrittlement (HE). Serious HE of hydrogen tank represents a huge dangers to the safety of vehicles and passengers. It is critical and timely to outline the mainstream approach and point out potential avenues for further investigation of HE. An analysis, including the mechanism (including hydrogen-enhanced local plasticity model, hydrogen-enhanced decohesion mechanism and hydrogen pressure theory), the detection (including slow strain rate test, linearly increasing stress test and so on) and methods for the prevention of HE on aluminum alloys of hydrogen vehicles (such as coating) are systematically presented in this work. Moreover, the entire experimental detection procedures for HE are expounded. Ultimately, the prevention measures are discussed in detail. It is believed that further prevention measures will rely on the integration of multiple prevention methods. Successfully solving this problem is of great significance to reduce the risk of failure of hydrogen storage tanks and improve the reliability of aluminum alloys for engineering applications in various industries including automotive and aerospace.

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“…In the hydrometallurgical process, the presence of salts will not only affect the reaction rate but also the subsequent performance of products, 25 which are usually removed by high-temperature oxidation or leaching when processing and using SAD. 6,26,27 Mahinroosta and Allahverdi 28 used the coning and quartering method to extract alumina powder from SAD, which effectively reduced the concentration of the leaching agent and reduced the harm to the environment. However, these methods will increase additional energy consumption through the fussy process.…”

Section: Introductionmentioning

confidence: 99%

“…53 In view of the chemical composition of SAD, a simple, versatile, effective method has been proposed here, namely, directly sintering dry-pressed green bodies from SAD as the sole raw materials to obtain alumina-based porous ceramics, which is free of AlN and salt removal process unlike traditional way for recycling of SAD. 26,54 In turn, the main composition AlN in SAD acts as the critical high-temperature foaming agent while salt could be volatized at high temperature. Benefited from the volume expansion occurred due to high-temperature foaming process as well as oxidation reaction of metal aluminum, near-zero shrinkage fabrication of porous ceramics has been realized.…”

Section: Introductionmentioning

confidence: 99%

Porous ceramics with near‐zero shrinkage and low thermal conductivity from hazardous secondary aluminum dross

Zhang

Shen

et al. 2022

J Am Ceram Soc

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Herein, a simple, versatile, and low-cost approach has been proposed to realize the green utilization of secondary aluminum dross, the hazardous solid waste, namely directly sintering dry-pressed green bodies from secondary aluminum dross to fabricate porous ceramics according to high-temperature foaming process spontaneously without adding spare foaming agents. Aluminum nitride (AlN) in secondary aluminum dross was employed to realize high-temperature foaming due to its oxidation, which makes traditional AlN and salts removal process needless. Moreover, near-zero shrinkage or even expansion during sintering of porous ceramics have occurred because in-situ foaming process together with the oxidation of Al particles well offset the sintering shrinkage. After sintering at 1400 • C for 2 h, porous ceramics composed of α-Al 2 O 3 and spinel phases with open porosity of 37.91%, sintering expansion rate of 1.13%, flexural strength of 45.67 MPa, and thermal conductivity of 0.97 W/(m⋅K) have been prepared. Cenospheres as pore-forming agents have been added to further improve the porosity, and alumina-based porous ceramics with open porosity of 28.39%-43.20% and flexural strength of 15.80-52.48 MPa have been obtained. This effective solution for recycling secondary aluminum dross could supply high-performance porous ceramics, which is expected to be applied in the fields of light-weight structural components and thermal insulations.

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A thermodynamic and kinetic study of catalyzed hydrolysis of aluminum nitride in secondary aluminum dross

Cited by 53 publications

References 26 publications

A Denitrification-Phase Transition and Protection Rings (DPP) Process for Recycling Electrolytic Aluminum Dross

A Denitrification-Phase Transition and Protection Rings (DPP) Process for Recycling Electrolytic Aluminum Dross

Analysis of Hydrogen Embrittlement on Aluminum Alloys for Vehicle-Mounted Hydrogen Storage Tanks: A Review

Porous ceramics with near‐zero shrinkage and low thermal conductivity from hazardous secondary aluminum dross

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