Journal
MINERAL PROCESSING AND EXTRACTIVE METALLURGY REVIEW
Volume 33, Issue 2, Pages 99-157Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/08827508.2010.542211
Keywords
alloys; aluminum; iron removal; modification
Funding
- Research Board Grant
- Laboratory of Green Process Metallurgy and Modeling (GPMM)
- Material Research Center (MRC)
- Intelligent Systems Center (ISC) at Missouri University of Science and Technology (Missouri ST)
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In this paper, the Fe-rich phases in and their detrimental effect on aluminum alloys are summarized. The existence of brittle platelet beta-Fe-rich phases lowers the mechanical properties of aluminum alloys. The methods to neutralize the detrimental effect of iron are discussed. The use of high cooling rate, solution heat treatment, and addition of elements such as Mn, Cr, Be, Co, Mo, Ni, V, W, Cu, Sr, or the rare earth elements Y, Nd, La, and Ce are reported to modify the platelet Fe-rich phases in aluminum alloys. The mechanism of the modification is briefly described. Technologies to remove iron from aluminum are reviewed extensively. The precipitation and removal of Fe-rich phases (sludge) are discussed. The dense phases can be removed by methods such as gravitational separation, electromagnetic (EM) separation, and centrifuge. Other methods include electrolysis, electro-slag refining, fractional solidification, and fluxing refining. The expensive three-layer cell electrolysis process is the most successful technique to remove iron from aluminum so far.
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