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In aluminum electrolysis, the iron-rich cover material is formed on the cover material and the steel rod connecting the carbon anode. Due to the high iron content in the iron-rich cover material, it differs from traditional cover material and thus requires harmless recycling and treatment. A process was proposed and used in this study to recovery F, Al, and Fe elements from the iron-rich cover material. This process involved aluminum sulfate solution leaching for fluorine recovery and alkali-acid synergistic leaching for α-Al 2 O 3 and Fe 2 O 3 recovery were obtained. The optimal leaching rates for F, Na, Ca, Fe, and Si were 93.92, 96.25, 94.53, 4.48, and 28.87%, respectively. The leaching solution and leaching residue were obtained. The leaching solution was neutralized to obtain the aluminum hydroxide fluoride hydrate (AHFH, AlF 1.5 (OH) 1.5 ·(H 2 O) 0.375 ). AHFH was calcined to form a mixture of AlF 3 and Al 2 O 3 with a purity of 96.14%. The overall recovery rate of F in the entire process was 92.36%. Additionally, the leaching residue was sequentially leached with alkali and acid to obtain the acid leach residue α-Al 2 O 3 . The pH of the acid-leached solution was adjusted to produce a black-brown precipitate, which was converted to Fe 2 O 3 under a high-temperature calcination, and the recovery rate of Fe in the whole process was 94.54%. Therefore, this study provides a new method for recovering F, Al, and Fe in iron-rich cover material, enabling the utilization of aluminum hazardous waste sources.

Titel:	Recovery of aluminum oxide and iron oxide from aluminum electrolysis iron-rich cover material and preparation of aluminum fluoride.
Autor/in / Beteiligte Person:	Lan, J ; Yan, H ; Liu, Z ; Ma, W
Link:	Zum Volltext
Zeitschrift:	Environmental science and pollution research international, Jg. 31 (2024-04-01), Heft 18, S. 27388-27402
Veröffentlichung:	<2013->: Berlin : Springer ; <i>Original Publication</i>: Landsberg, Germany : Ecomed, 2024
Medientyp:	academicJournal
ISSN:	1614-7499 (electronic)
DOI:	10.1007/s11356-024-32877-y
Schlagwort:	Iron chemistry Aluminum Compounds chemistry Recycling Ferric Compounds chemistry Electrolysis Aluminum chemistry Fluorides chemistry Aluminum Oxide chemistry
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(PMID: 10.13662/j.cnki.qjs.2015.09.008) Grant Information: 52064030 Nation Natural Science Foundation of China; YNQR-CYRC-2018-013 Yunnan industrial talent project; grant NO. 202202AG050011and 202202AG050007 Yunnan Major Scientific and Technological Projects Contributed Indexing: Keywords: Aluminum hazardous waste; Aluminum hydroxide fluoride hydrate; Aluminum sulfate solution leaching; Calcination; Iron-rich cover material; Recycle aluminum fluoride Substance Nomenclature: 0 (Ferric Compounds) ; CPD4NFA903 (Aluminum) ; Q80VPU408O (Fluorides) ; LMI26O6933 (Aluminum Oxide) ; Z77H3IKW94 (aluminum fluoride) ; E1UOL152H7 (Iron) ; 0 (Aluminum Compounds) ; 1K09F3G675 (ferric oxide) Entry Date(s): Date Created: 20240321 Date Completed: 20240426 Latest Revision: 20240502 Update Code: 20240503

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Recovery of aluminum oxide and iron oxide from aluminum electrolysis iron-rich cover material and preparation of aluminum fluoride.