Influence of Sulfur Species on Current Efficiency in the Aluminum Smelting Process

Rauan Meirbekova, Geir Martin Haarberg, Jomar Thonstad, Gudrun Saevarsdottir

Rannsóknarafurð: Framlag til fræðitímaritsGreinritrýni

6 Tilvitnanir (Scopus)

Útdráttur

Anode impurities are the major source of sulfur in aluminum electrolysis. Sulfur in anodes is mainly found as organic compounds. Alumina also introduces small quantities of sulfur, typically in the form of sulfates. The scarcity and cost of low-sulfur raw materials and the possibility of sulfur removal from the cell by means of flue gas may make high-sulfur content anodes a viable option. However, some anode impurities are known to affect current efficiency in aluminum production and caution must be exercised. The effect of increased sulfur content in the aluminum electrolysis electrolyte must be studied. This paper explores the effect of increased sulfur concentration in the electrolyte on current efficiency in a laboratory cell. Sodium sulfate was added to the electrolyte as a source of sulfur at regular time intervals to maintain a constant sulfur concentration. Current efficiency decreased by 1.1 pct per each 100 mg/kg (ppm) increase in sulfur concentration in the electrolyte.

Upprunalegt tungumálEnska
Síður (frá-til)1309-1314
Síðufjöldi6
FræðitímaritMetallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
Bindi47
Númer tölublaðs2
DOI
ÚtgáfustaðaÚtgefið - 1 apr. 2016

Athugasemd

Publisher Copyright:
© 2016, The Minerals, Metals & Materials Society and ASM International.

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