Results 271 to 280 of about 79,481 (302)
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Bayer's process for alumina production: A historical perspective
Bulletin for the History of Chemistry, 1995A biog. of Karl Josef Bayer is presented in light of his invention of aluminum hydroxide prodn. from bauxite.
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Sizing an Organic Control System for the Bayer Process
2016Organic materials are introduced to the Bayer process by almost all bauxites. Over time, the accumulation of organic matter in some Bayer liquors decreases liquor and plant productivity. The organics level can be limited by some form of liquor purging, or by operating an organics control system.
Jose G. Pulpeiro +4 more
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Impact of Bayer Process Liquor Impurities on Causticization
Industrial & Engineering Chemistry Research, 2007Spent liquor from a high-temperature Jamaican alumina refinery was analyzed to determine levels (g/L) of the following impurities (p = 0.05): oxalate, 2.74 ± 0.52; sulfate, 23.23 ± 3.00; chloride, 6.36 ± 0.50; fluoride, 2.49 ± 0.05; thiosulfate, 2.47 ± 0.62; ethanoate, 5.16 ± 0.72; and organic carbon, 23.68 ± 1.99.
Max Wellington, Franklin Valcin
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BAYER PROCESS CONTROL AT ALCAN VAUDREUIL WORKS
IFAC Proceedings Volumes, 2007Abstract Alcan Vaudreuil Works is the only alumina plant in Canada. The plant produces about 1.4 milion tons of alumina per year, using the Bayer process to treat bauxite ore. In addition to regulatory control, this complex extraction process involves many applications of advanced process control.
Valérie Ouellet +2 more
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Conversion of Sulfur by Wet Oxidation in the Bayer Process
Metallurgical and Materials Transactions B, 2015In this paper, the effects of temperature, oxidation time, and oxygen concentration on the conversion of sulfur by wet oxidation in the Bayer process were investigated at length. The results show that active sulfur S2− and S2O3 2− in sodium aluminate solution can be converted completely by wet oxidation during the digestion ...
Zhanwei Liu +4 more
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Chemical Thermodynamics and Reaction Kinetics of Bayer Process Desilication
With increasing amount of high silica bauxitesBauxite used as Bayer refinery feed, the re-precipitation of dissolved silicates results in greater volumes of desilication productDesilication products (commonly known as DSP) which corresponds to elevated caustic consumption and issues with bauxite residueBauxite residueneutralisationNeutralisation and ...Peng, Hong +4 more
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Red Mud Flocculants Used in the Bayer Process
2011Flocculation and separation of red mud is an integral part of the Bayer process. Over the latter half of the 20th century, flocculant technology dramatically changed from natural starches to use of “rationally designed” polymers. Many of these advancements were due to the introduction of liquid or emulsion based flocculants which enabled elaborate post-
F. Ballentine +2 more
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Oxalate/Gibbsite co-precipitation in the Bayer process [PDF]
, 2015 In the precipitation circuit of the Bayer process, the organic impurity sodium oxalate (Na2C2O4 ) co-precipitates with the product - gibbsite (γ-Al(OH)3). This co-precipitation, results in numerous industrial problems such as increasing the content of gibbsite fines, decreasing gibbsite agglomeration efficiency, increasing the rate of oxalate-gibbsite ...
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Some Aspects of Calcium Chemistry in the Bayer Process
2016Lime is used in vast quantities in alumina refineries throughout the world and is often regarded as something of a universal cure for many of the ills of the Bayer process. However, like many popular remedies, information as to how it actually works is quite sparse, and often contradictory. Fortunately, this situation is now changing.
Steven P Rosenberg +2 more
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Chemical thermodynamics of mercury in the Bayer process
2014Mercury is a toxic element that is associated with many industrial activities including the Bayer process. Mercury is known to enter the Bayer process with the bauxite fee d material and has the potential to accumulate as the process solution is largely recycled. This paper explores the speciation of mercury in Bayer process solution streams.
Bansal, Neetu +4 more
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