The Pechiney reduction cell family: 25 years of development in design and process control

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Mots clés : Aluminum;Reduction cell;Process control;Design;Aluminum Pechiney
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Sommaire: In the Bayer process, flocculants are introduced in the feed well to enhance the aggregation of red mud particles. To gain a better understanding of the flocculation process taking place in the feed well, shear-induced flocculation was achieved using concentric rotating cylinders (Couette system). Our previous work has shown the effect of the shear rate on the aggregate’s settling rate and on residual turbidity of the Bayer liquor. In this study, the data demonstrated that the aggregates at...
Publication: CIM Bulletin
Auteur(s): M.J. Gagnon, G. Simard, A. Charette, G. Péloquin
Mots clés: Flocculants, Aggregates, Shear conditions, Red mud particles
Numéro: 1062
Volume: 95
Année: 2002
Texte
Sommaire: The recovery of additions in light metals is an important parameter influencing consistency of the finished product, which ultimately means cost. Recovery is a function of many parameters such as assimilation speed, addition density, addition practice, liquid metal processing conditions, etc. In liquid metal processing operations, it is desirable to have the maximum possible recovery at the shortest possible time. In this paper a new index will be presented, namely, the rate of recovery (RR)....
Publication: CIM Bulletin
Auteur(s): S.A. Argyropoulos, M. Pekguleryuz
Mots clés: Light metals, Additions, Recovery, Aluminum, Liquid aluminum, Alloys
Numéro: 1062
Volume: 95
Année: 2002
Texte
Sommaire: In 1999, PFC measurements were carried out at Alcan smelters as part of a large measurement campaign led by the Canadian Aluminium Association. Side worked prebake (SWPB) and horizontal stud Söderberg (HSS) plants in Arvida were the selected sites. CF4 and C2F6 emissions were measured continuously in the exhaust duct and at the roof vents for a week. In parallel, voltages from four designated cells were recorded at a high scan rate. Results were analyzed and correlations between voltage,...
Publication: CIM Bulletin
Auteur(s): A. Gosselin
Mots clés: Voltage measurement, Gas measurement, Anode effect, PFC emissions
Numéro: 1062
Volume: 95
Année: 2002
Texte
Sommaire: This paper examines the impact of the various assumptions that go into an economic evaluation, and shows how these can be combined to show an exciting result that may not really exist. An example of an embellished case (the kind that one frequently sees when projects are being promoted) is developed and the cumulative impact is analyzed to show the actual project underneath. The paper also points out some areas to watch for overly optimistic assumptions such as prices, inflation, and debt....
Publication: CIM Bulletin
Auteur(s): L.D. Smith
Mots clés: Economic evaluation, “Bare bones,” Cash flow, Discount rates, Net present value (NPV), Internal rate of return (IRR)
Numéro: 1062
Volume: 95
Année: 2002
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