ChemInform Abstract: EXPLORATORY STUDIES ON ELECTROLYSIS OF ALUMINUM NITRIDE DISSOLVED IN MOLTEN SALTS

Bonomi, Antonio; Hadate, M.; Breda, F.; Gentaz, C.

doi:10.1002/chin.198219020

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“…AlN was reported to be stable in molten LiCl-KCl-Li 3 N systems at 723 K [42] and molten cryolite. [43] As a result, the Al produced due to Eq. [6] should be free of Ca.…”

Section: Reduction Mechanismsmentioning

confidence: 98%

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Chemical and Electrochemical Processing of Aluminum Dross Using Molten Salts

Xiao

2008

Metall Mater Trans B

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A novel molten salt process was investigated, where Al, as metal or contained in Al 2 O 3 and AlN, was recovered from Al dross by chemical or direct electrochemical reduction in electrolytic cells. Electrolysis experiments were carried out under argon at temperatures from 1123 to 1243 K. In order to better understand the reduction behavior, the as-received Al dross was simulated using simplified systems, including pure Al 2 O 3 , pure AlN, an Al 2 O 3 /AlN binary mixture, and an Al 2 O 3 /AlN/Al ternary mixture. The reduction of the as-received dross was also studied experimentally. The studies showed that solid Al 2 O 3 was chemically reduced by the Ca in a Ca-saturated Ca-CaCl 2 melt to form Al 2 Ca or electrochemically reduced to Al-rich Al-Ca alloys and that the Al value in the Al 2 O 3 was easily recovered from the Al drosses. It was found experimentally that solid AlN in the drosses could not be calciothermically reduced to any extent, consistent with thermodynamic evaluations. It was also found that the direct electrochemical reduction of the AlN in the drosses was confined to three phase boundaries (3PBs) between the AlN, the electrolyte, and the current collector and could not be enhanced by using the LiCl-containing chloride melt or the chloride-fluoride melts studied. The presence of Al powder in the Al 2 O 3 /AlN mixture facilitated the direct electrochemical reduction of both Al 2 O 3 and AlN. The reduction mechanisms are discussed based upon the present experimental observations. Flow sheets for recovering the metallic Al and the Al in the Al 2 O 3 and AlN from Al dross are finally proposed.

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“…AlN was reported to be stable in molten LiCl-KCl-Li 3 N systems at 723 K [42] and molten cryolite. [43] As a result, the Al produced due to Eq. [6] should be free of Ca.…”

Section: Reduction Mechanismsmentioning

confidence: 98%

“…However, it was difficult to directly recover the Al from AlN in the dross. It was suggested to apply the AlN fi Al 2 O 3 conversion techniques [43][44][45] to recover indirectly the Al value from the AlN.…”

mentioning

confidence: 99%

Chemical and Electrochemical Processing of Aluminum Dross Using Molten Salts

Xiao

2008

Metall Mater Trans B

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ChemInform Abstract: EXPLORATORY STUDIES ON ELECTROLYSIS OF ALUMINUM NITRIDE DISSOLVED IN MOLTEN SALTS

Abstract: Aus Löslichkeits‐ und elektrochemischen Untersuchungen geht hervor, daß AlN sich in Li3N‐ LiCl‐Schmelzen auflösen läßt und daß dieser Elektrolyttyp geeignete Zusammensetzungen und Eigenschaften f eine neuartige elektrolytische Al‐Gewinnung aufweist.

Cited by 1 publication

References 1 publication

Chemical and Electrochemical Processing of Aluminum Dross Using Molten Salts

Chemical and Electrochemical Processing of Aluminum Dross Using Molten Salts

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