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It is important to remove active substances from secondary aluminum dross (SAD) to meet the reuse of SAD. In this work, the removal of active substances from different particle sizes of SAD was studied using roasting improvement with particle sorting. The results showed that roasting after particle sorting pretreatment can effectively remove fluoride and aluminum nitride (AlN) from SAD, while getting the high-grade alumina (Al 2 O 3 ) crude materials. The active substances of SAD mainly contribute to AlN, aluminum carbide (Al 4 C 3 ), and soluble fluoride ions. AlN and Al 3 C 4 mainly exist in particles of 0.05-0.1 mm, while Al and fluoride are mainly in particles of 0.1-0.2 mm. The SAD of particle size ranging 0.1-0.2 mm has high activity and leaching toxicity; the gas emission was reached 50.9 mL/g (limit value of 4 mL/g), and the fluoride ion concentration in the literature was 137.62 mg/L (limit value of 100 mg/L) during the identification for reactivity and leaching toxicity according to GB5085.5-2007 and GB5085.3-2007, respectively. Roasting at 1000 °C for 90 min, the active substances of SAD were converted to Al 2 O 3 , N 2 , and CO 2 ; meanwhile, soluble fluoride converted to stable CaF 2 . The final gas release was reduced to 2.01 mL/g while soluble fluoride from SAD residues was reduced to 6.16 mg/L, respectively. The Al 2 O 3 content of SAD residues was determined at 91.8% and has been classified as category I solid waste. The results suggested that the roasting improvement with particle sorting of SAD can meet the reuse of valuable materials at full scale.

Titel:	Particle sorting to improve the removal of fluoride and aluminum nitride from secondary aluminum dross by roasting.
Autor/in / Beteiligte Person:	Xie, H ; Guo, Z ; Xu, R ; Zhang, Y
Link:	Zum Volltext
Zeitschrift:	Environmental science and pollution research international, Jg. 30 (2023-04-01), Heft 19, S. 54536-54546
Veröffentlichung:	<2013->: Berlin : Springer ; <i>Original Publication</i>: Landsberg, Germany : Ecomed, 2023
Medientyp:	academicJournal
ISSN:	1614-7499 (electronic)
DOI:	10.1007/s11356-023-26201-3
Schlagwort:	Aluminum Compounds Aluminum Oxide chemistry Aluminum chemistry Fluorides
Sonstiges:	Nachgewiesen in: MEDLINE Sprachen: English Publication Type: Journal Article Language: English [Environ Sci Pollut Res Int] 2023 Apr; Vol. 30 (19), pp. 54536-54546. <i>Date of Electronic Publication: </i>2023 Mar 06. MeSH Terms: Aluminum* / chemistry ; Fluorides* ; Aluminum Compounds ; Aluminum Oxide / chemistry References: David E, Kopac J (2012) Hydrolysis of aluminum dross material to achieve zero hazardous waste. J Hazard Mater 209:501–509. (PMID: 10.1016/j.jhazmat.2012.01.064) ; Gao Q, Guo Q, Li YL, Ren BZ (2021) Innovative technology for defluorination of secondary aluminum dross by alkali leaching. Miner Eng 172:107134. (PMID: 10.1016/j.mineng.2021.107134) ; Garcia-Mendez M, Morales-Rodriguez S, Shaji S, Krishnan B (2011) Structural properties of AlN films with oxygen content deposited by reactive magnetron sputtering: XRD and XPS characterization. Surf Rev Lett 18:23–31. 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(PMID: 10.1016/j.jclepro.2020.123291) Grant Information: [2016]59-3 Environmental Protection Scientific Project from Ecology and Environment Department of Hunan Province of China; 2018YFC1800400 National Key Research and Development Program of China Contributed Indexing: Keywords: Aluminum nitride; Fluoride; Particle sorting; Roasting; Secondary aluminum dross Substance Nomenclature: CPD4NFA903 (Aluminum) ; 7K47D7P3M0 (aluminum nitride) ; Q80VPU408O (Fluorides) ; 0 (Aluminum Compounds) ; LMI26O6933 (Aluminum Oxide) Entry Date(s): Date Created: 20230305 Date Completed: 20230425 Latest Revision: 20230425 Update Code: 20231215

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Particle sorting to improve the removal of fluoride and aluminum nitride from secondary aluminum dross by roasting.