Results 251 to 260 of about 79,481 (302)

The agglomeration kinetics of aluminum hydroxide in Bayer process

Powder Technology, 2012
Abstract The effects of temperature, seed mass and agitation rate on agglomeration kinetics of aluminum hydroxide in Bayer process have been studied in a batch system. Collected raw data were analyzed and the kinetics data of agglomeration were derived through simulation of the process using a pre-developed software.
Masoud Bahrami, Salman Movahedirad, S Ranjbarian   +2 more
exaly   +2 more sources

Insoluble Organic Compounds in the Bayer Process

Industrial & Engineering Chemistry Research, 2001
During the dissolution of bauxite in a high-temperature (250−255 °C) Bayer process, which separates aluminum hydroxide and oxide in the ore from iron oxide and other impurities, a number of insolub...
Damian E. Smeulders, Michael A. Wilson, Lyndon Armstrong   +2 more
openaire   +1 more source

Chemical Reaction Engineering in the Bayer Process

2016
Chemical reaction engineering provides an important link between chemistry (kinetics, thermodynamics) and economics (capital cost, productivity, efficiency). The key elements are interpretation of (batch) laboratory data, application of the resultant models to continuous operations, and industrial equipment selection (and costing).
Daniel Thomas, Benyan Pei
openaire   +1 more source

Perspective on Bayer Process Energy

2011
The three most important cost items in the production of alumina are bauxite, caustic soda, and energy. Alumina energy cost will likely rise more than other costs because of energy price increases and energy related environmental issues. As energy cost increases, refineries will need to adjust the process to maintain or improve their position on the ...
openaire   +1 more source

Aspen Modeling of the Bayer Process

2016
The ASPEN simulator was used to model Alcoa’s Pt. Comfort Bayer refinery. All areas of the refinery including the lakes and powerhouse were modeled. Each area model was designed to be run stand alone or integrated with others for a full plant model .
J. M. Langa, T. G. Russell, G. A. O’Neill, P. Gacka, V. B. Shah, J. L. Stephenson, J. G. Snyder   +6 more
openaire   +1 more source

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
openaire   +1 more source

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

Basic Principles of Bayer Process Design

2016
Data 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
openaire   +1 more source

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

Development of New Bayer Process Flocculants

2016
New 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, A. S. Rothenberg, H. I. Heitner, M. E. Lewellyn, L. H. Laviolette, T. Foster, P. V. Avotins   +6 more
openaire   +1 more source