Results 221 to 230 of about 74,781 (265)

Assessment of strength development in Bayer-process residues

Journal of Materials Science, 1992
The strength which develops naturally in dried-out lumps of Bayer-process residue (red mud) is investigated for possible use in building material. The ease with which this strength can be reproduced, and its resistance to wet and dry conditions, are assessed in practical-sized building blocks.
W. R. Pinnock, J. N. Gordon
openaire   +1 more source

Review of Bayer Organics-Oxalate Control Processes

2016
Since the mid-forties, the Aluminum Company of Canada Arvida Research Centre jointly with the Technical Departments of the Bayer Plants have been actively searching for suitable methods of controlling Bayer organics, in general, and sodium oxalate, in particular.
B. Gnyra, G. Lever
openaire   +1 more source

Impact of Bayer Process Liquor Impurities on Causticization

Industrial & Engineering Chemistry Research, 2007
Spent 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
openaire   +1 more source

Alumina Yield in the Bayer Process

2016
The alumina industry has historically been able to reduce alumina production costs, by increasing the liquor alumina yield. To know the potential for further yield increases, the phase diagram of the ternary system Na2O-Al2O -H2O at various temperature levels was analysed.
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Heat Transfer in the Bayer Process

2016
Heat transfer equipment represents a significant portion of Bayer process plant capital and operating costs. Heater operation and maintenance activities can also create potential hazard exposure. Very early flowsheets tended to rely on direct heat transfer, i.e.
openaire   +1 more source

Determining silica solubility in bayer process liquor

JOM, 1998
The efficient precipitation of dissolved silica from Bayer process liquor is essential for the production of high-quality alumina and the reduction of excessive scaling in the heat exchangers in the evaporation building of Bayer processes. The accurate prediction of silica solubility in Bayer liquor is one of the key parameters in improving the design ...
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Continuous Process for Photodegradation of Industrial Bayer Liquor

Industrial & Engineering Chemistry Research, 2001
Photodegradation 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, M. P. Brungs, A. A. Adesina   +2 more
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Preheaters and Digesters in the Bayer Digestion Process

2016
The existing preheaters and digesters applied in Bayer digestion processes are classified and investigated in this paper. The characteristics and mineral compositions of bauxite to be processed have great effects on the performance and operational efficiency of the preheaters and digesters. Therefore, the design concept and selection principle of Bayer
Gu Songqing, Yin Zhonglin
openaire   +1 more source

Direct Calcification–Carbonation Method for Processing of Bayer Process Red Mud

Russian Journal of Non-Ferrous Metals, 2018
The highly-alkaline red mud, which is the Bayer process residue generated from the alumina industry, is a severe environmental problem. In this study, a new calcification–carbonation process was proposed for red mud disposal. Red mud was processed by lime to convert the aqueous silicon phase into hydrogarnet, which was then decomposed by CO2 to recover
Li-Qun Xie, Ting-An Zhang, Guo-Zhi Lv, Xiao-Feng Zhu   +3 more
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The electrodeposition of gallium from synthetic Bayer-process liquors

Journal of Applied Electrochemistry, 1988
Gallium was electrodeposited from a synthetic Bayer solution comprising 4.5m NaOH/0.2m Na2CO3/0.3m NaCl/1.7m Al(OH)3. Hydrogen evolution occurred in parallel with gallium deposition, the latter process being in part controlled by mass transfer and in part by the electron transfer step.
R. Dorin, E. J. Frazer
openaire   +1 more source