Removal of AlN from secondary aluminum dross by pyrometallurgical treatment

Wang, Jianhui; Zhong, Ye-qing; Yue, Tong; Xu, Xun-lin; Lin, Guo

doi:10.1007/s11771-021-4610-4

Cited by 30 publications

(4 citation statements)

References 41 publications

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“…The influence of each factor on the hydrolysis reaction can be investigated independently by the influence factor evaluation test, and then the response surface model can be applied to analyze the rate of denitrification, which can lead to a more comprehensive understanding of the interactions between the factors and to find the conditions to achieve the best denitrification effect. The model can predict the effect of different combinations of factors on the nitrogen removal effect, and the model can be validated and optimized through several experiments [29]. While optimizing the denitrification process conditions, appropriate process control is explored to increase the alumina content to meet the demand of recycling it as a raw material for aluminum smelting, and to achieve the goal of simultaneous nitrogen removal and resource recycling, thus realizing an environmentally friendly treatment of SAD, rational resourceful recycling and comprehensive utilization.…”

Section: Methods and Principlesmentioning

confidence: 99%

Optimizing Wet Hydrolysis for Nitrogen Removal and Alumina Recovery from Secondary Aluminium Dross (SAD)

Jiang,

Lee

2024

Sustainability

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Secondary aluminum dross is a solid waste generated after removing aluminum from industrial aluminum slag (primary aluminum dross), which is included in the European Hazardous Waste List because of harmful substances such as aluminum nitride. More and more SAD is being directly disposed of in landfills, which will not only harm the ecological environment and human health, but also cause resources. Under the background of green and low-carbon circular economy, nitrogen removal and resource recycling of SAD are very important environmental pollution, resource and the economic benefits of the aluminum industry. In this study, a new method was introduced to explore the interaction between various factors in the denitrification process by using the response surface method, and the optimal denitrification process conditions were predicted and determined by a regression equation that is, the denitrification rate of SAD was 99.98% at the reaction time of 263 min, reaction temperature of 95 ℃ and concentration of 6.5 wt.%. Furthermore, the content of Al2O3 in SAD was successfully elevated to 98.43% through the reaction carried out in a 10 wt.% NaOH solution system at the controlled temperature of 90 °C for 5 h. It was summarized that the wet treatment methodology can efficiently eliminate aluminum nitride (AlN) from SAD and heighten the Al2O3 grade to meet metallurgical standards. This research is expected to eliminate the adverse impact of SAD on the environment and its safety risks, and provide an innovative method for the sustainable resource utilization of SAD.

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Section: Methods and Principlesmentioning

confidence: 99%

Optimizing Wet Hydrolysis for Nitrogen Removal and Alumina Recovery from Secondary Aluminium Dross (SAD)

Jiang,

Lee

2024

Sustainability

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“…As shown in Figure 1b, this process is a gas-solid reaction model with alternating external and internal diffusion. Wang et al [86] used a cryolite pyrometallurgy process to remove AlN in SAD. The experiment proved that cryolite can effectively promote the oxidation of AlN, and the removal rate of AlN was as high as 94.71% under optimized conditions.…”

Section: Removal Of Aluminum Nitridementioning

confidence: 99%

Transformation and Detoxification of Typical Metallurgical Hazardous Waste into a Resource: A Review of the Development of Harmless Treatment and Utilization in China

Wang,

Zhao,

Wang

et al. 2024

Materials

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The production process of the metallurgical industry generates a significant quantity of hazardous waste. At present, the common disposal method for metallurgical hazardous waste is landfilling, which synchronously leads to the leaching of toxic elements and the loss of valuable metals. This paper presents a comprehensive review of the research progress in the harmless treatment and resource utilization of stainless steel dust/sludge (including stainless steel dust and stainless steel pickling sludge) and aluminum ash (including primary aluminum ash and secondary aluminum dross), which serve as representative hazardous wastes in ferrous metallurgy and nonferrous metallurgy, respectively. Additionally, the general steps involved in the comprehensive utilization of metallurgical hazardous waste are summarized. Finally, this paper provides a prospective analysis on the future development and research trends of comprehensive utilization for metallurgical hazardous waste, aiming to offer a basis for the future harmless, high-value, resource-based treatment of metallurgical hazardous waste and the realization of industrial applications in China.

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“…Many scholars have studied the non-harmful treatment of aluminum dross. Based on the response surface method, Wang [9] carried out research on the influence of cryolite (Na 3 AlF 6 ), roasting temperature and soaking time on the denitrification degree of secondary aluminum dross. Li [10] achieved nitrogen removal and fluoride retention with the addition of calcium salt (CaCl 2 ) and the roasting of aluminum dross at a high temperature (1300 • C).…”

Section: Introductionmentioning

confidence: 99%

Effects of Additive and Roasting Processes on Nitrogen Removal from Aluminum Dross

Wang

et al. 2022

Coatings

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Taking high nitrogen aluminum dross as the research object, the effects of the additives sodium carbonate and cryolite and the roasting process on the denitrification effect of aluminum dross were studied. The principle of additive denitrification was studied by XRD, SEM and TG-DSC. The experimental results show that sodium carbonate and cryolite can quickly reduce the content of aluminum nitride in aluminum dross. The optimum denitrification process parameters were also obtained simultaneously. When the mass ratio of cryolite to aluminum dross was 0.4, the roasting temperature was 900 °C, and the roasting time was 3 h, the denitrification degree could reach 96.19%. When the mass ratio of sodium carbonate to aluminum dross was 0.8, the roasting temperature was 1000 °C, and the roasting time was 4 h, the denitrification degree could reach 91.32%. This study provides a reference for the non-harmful treatment of high nitrogen aluminum dross.

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Removal of AlN from secondary aluminum dross by pyrometallurgical treatment

Cited by 30 publications

References 41 publications

Optimizing Wet Hydrolysis for Nitrogen Removal and Alumina Recovery from Secondary Aluminium Dross (SAD)

Optimizing Wet Hydrolysis for Nitrogen Removal and Alumina Recovery from Secondary Aluminium Dross (SAD)

Transformation and Detoxification of Typical Metallurgical Hazardous Waste into a Resource: A Review of the Development of Harmless Treatment and Utilization in China

Effects of Additive and Roasting Processes on Nitrogen Removal from Aluminum Dross

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