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Development of New Bayer Process Flocculants
2016New Bayer process flocculants which contain hydroxamate functional groups have been evaluated in laboratory settling tests in Bayer plants processing a wide variety of bauxites. Such tests have given consistently very low overflow solids, generally less than 20% of the solids obtained with conventional polyacrylates.
D. P. Spitzer +6 more
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Organic Control Technologies in Bayer Process
2016Many Bayer plant problems originate from organics contamination of the Bayer liquor. Organics can decrease liquor productivity either by increasing alumina solubility or by covering active sites on alumina hydrate seeds. Organics also induce coloration of the liquor, cause excessive foaming, and increase liquor viscosity, density and boiling point. All
Gervais Soucy +2 more
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Basic Principles of Bayer Process Design
2016Data used in Bayer process design are presented, with an account of the methods used in evaluation of bauxites as a source of alumina, and of plant design, with particular reference made to extraction, silica, mud separation, decomposition, causticization, flow of fluids, and heat transfer.
A. N. Adamson, E. J. Bloore, A. R. Carr
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Continuous Process for Photodegradation of Industrial Bayer Liquor
Industrial & Engineering Chemistry Research, 2001Photodegradation of spent Bayer liquor has been carried out in an 18-L pilot-scale continuous annular photoreactor. The performance of the reactor was studied with respect to various process parameters such as the gas flow rate, liquid flow rate, initial solution pH, initial substrate concentration, light intensity, and catalyst loading.
V. K. Pareek +2 more
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Bayer Process Efficiency Improvement
2016The process efficiency has a great influence on the production yield, energy consumption, investment and operation cost in Bayer process.
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Investigation of scale formation in the Bayer process [PDF]
, 2003 Aluminosilicate ‘scales’ of the general formula Na8[AlSiO4]6X2.nH2O, X= ½CO3, OH that form during the Bayer process have been investigated. The ‘scales’ are composed of two main aluminosilicate phases, cancrinite and an intergrowth of sodalite and cancrinite, termed “intermediate”. Synthetic scales were prepared from kaolin, sodium hydroxide and sodium
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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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Dynamic Simulation and Control of the Bayer Process. A Review
Industrial & Engineering Chemistry Research, 2001In the Bayer process, used for the production of alumina from the bauxite ores, there are frequent disturbances and a large number of interacting processes which incorporate considerable dead time....
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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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