By John Grandfield
The mild Metals symposia are a key a part of the TMS Annual assembly & Exhibition, featuring the latest advancements, discoveries, and practices in fundamental aluminum technology and expertise. Publishing the lawsuits from those very important symposia, the sunshine Metals quantity has develop into the definitive reference within the box of aluminum creation and comparable gentle steel applied sciences. The 2014 assortment contains papers from the next symposia: •Alumina and Bauxite •Aluminum Alloys: Fabrication, Characterization and functions •Aluminum Processing •Aluminum relief know-how •Cast store for Aluminum creation •Electrode know-how for Aluminum construction •Light-metal Matrix (Nano)-composites
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15. Kirwan L. M. , “Characterisation of various Jamaican bauxite ores by quantitative Rietveld X-ray powder diffraction and 57Fe Mössbauer spectroscopy”, International Journal of Mineral Processing, 91, No. 1-2, April 2009, 14-18. 16. , “Autoprecipitation of Gibbsite and Boehmite”, Light Metals, 1982, 37-50. 17. , “Autoprecipitation of alumina in the Bayer process”, Light Metals, 1986, 225-230. 18. , Hodnett B. K. , “The effect of additives on gibbsite auto-precipitation and bauxite residue flocculation when processing goethitic bauxites”, Travaux, Proceedings ICSOBA, 2012, Alumina Program, AA12, 1-12.
Remaining Jamaican bauxite reserves more goethite rich Since the early days of exploration it was recognised that the mineralogy of Jamaican bauxite and its implications for the Bayer process stand out as being special. Since the 1950s there have been many publications detailing the effects of Jamaican bauxite species on the Bayer process. 20, saw the need to develop a classification system for Jamaican bauxites based on boehmite contents and goethite relative to hematite contents. This, was felt, would provide the basis for broad resource development planning including the allocation of bauxite reserves to specific Bayer plants with the aim of optimising process efficiency.
1000 k 800 600 400 q 1200 1400 q 1000 g c Boehmite 200 0 1400 800 600 h Boehmite 400 0 1400 1200 q 1200 1000 d 1000 800 600 800 g 400 200 b % 100 0 600 400 200 a % 100 200 % c 100 d 0 % 100 Fig. 1. Temperature fields of stability of transition forms of alumina hydroxides and oxide: a) gibbsite, b) bayerite, c) boehmite, d) diaspore [9]. The percentage of individual phases, depending on temperature is determined by the intersection points of temperature horizontal lines with border curves of existence of adjacent phases.
