Paper Title:
Dross Processing Technology
  Abstract

While it is generally acknowledged that dross generation should be kept to a minimum, too often the importance of maximizing the aluminium content of the dross is overlooked. Some mistakenly believe that a low metal content is a good thing and that the aluminium is being kept in the furnace. In reality, this metal is most likely being lost due to insufficient cooling and thermiting. Much can be gleaned from looking at the dross that is generated in a casthouse; in fact, the quality of dross can provide a good indication of the overall efficiency of the operation. Even with the very low aluminium prices of today of about US$1400 per tonne, a recovery improvement of just 3% for a facility producing 500t of dross per month can provide savings in excess of $250.000 per year. Effective dross management also results in better metal quality, improved fuel efficiency, prolonged refractory life and improved profitability in the entire facility. Over the years, as facilities have focused on better dross cooling and handling techniques, dross recoveries have improved. Today, dross recoveries should be in the range of 60 – 70%. These numbers will raise debate but 30 years of experience give us deep insight into these results. The paper looks at the different techniques of handling the dross that is produced within the melting/casting operation with the objective of maximizing aluminium recovery. This paper will consider both the initial dross handling within the cast house but then also how secondary processors should be evaluated to maximize the value of the dross being processed. A company can lose as much dross recovery opportunity here as in their own facility. . In summary, by careful attention to the equipment and process techniques around the furnace and the follow-on dross management, significant cost savings and environmental benefits can be realized by cast house operations.

  Info
Periodical
Edited by
J. A. Taylor, J. F. Grandfield, A. Prasad
Pages
53-60
DOI
10.4028/www.scientific.net/MSF.630.53
Citation
A. Peel, J. Herbert, D. Roth, M. J. Collins, "Dross Processing Technology", Materials Science Forum, Vol. 630, pp. 53-60, 2010
Online since
October 2009
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Alan Peel, James Herbert, Robert Connaughton, Hugh Cotton
Chapter 2: Controlling Melt Loss
Abstract:The handling of dross is an unfortunate but necessary activity in any aluminum cast house. One technology designed to cool dross and maximise...
33
Authors: David J. Roth
Chapter 2: Controlling Melt Loss
Abstract:Worldwide production of aluminium continues to grow even in the past economic slowdown period, at present the annual production is at...
24