Results 261 to 270 of about 235,115 (280)

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
openaire   +1 more source

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

Bayer's process for alumina production: A historical perspective

Bulletin for the History of Chemistry, 1995
A biog. of Karl Josef Bayer is presented in light of his invention of aluminum hydroxide prodn. from bauxite.
openaire   +2 more sources

Improving the Bayer Process productivity – An industrial case study

Minerals Engineering, 2009
Alumina production through Bayer Process is limited by the instability of soluble sodium aluminate in the supersaturated solutions used by the alumina refineries. The precipitation of aluminum hydrate can occur in equipment not designed for this purpose, causing significant loss of production.
Glayson Stopa Gontijo, Antonio Carlos Brandão de Araújo, Shiva Prasad, Luís Gonzaga Sales Vasconcelos, José Jaílson Nicácio Alves, Romildo Pereira Brito   +5 more
openaire   +1 more source

Red Mud Flocculants Used in the Bayer Process

2011
Flocculation 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, M. E. Lewellyn, S. A. Moffatt   +2 more
openaire   +1 more source

Investigation of zeolite scales formed in the Bayer process

Microporous and Mesoporous Materials, 2000
Abstract Synthetic sodium aluminosilicate Bayer refinery scale has been prepared in 8 and 4.2 M sodium hydroxide solutions at four temperatures in the temperature range 80–240°C. The effect of different anions (CO32−, OH− SO42−, Cl− and C2O42−) and varying anion concentrations (10−2–10−1 M) on the type of aluminosilicate phase formed has also been ...
J.A Armstrong, S.E Dann
openaire   +1 more source

Sizing an Organic Control System for the Bayer Process

2016
Organic 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, Liam Fleming, Bryan Hiscox, Jens Fenger, Benny E. Raahauge   +4 more
openaire   +1 more source

The possibility of feedforward process control in bayer plants using precomputed setpoint values: Part II. Applications to the bayer alumina process

The Canadian Journal of Chemical Engineering, 1984
Application de la methode exposee dans la 1ere partie, qui permet d'utiliser des modeles mathematiques complexes mais rigoureux, a la commande des procedes de digestion et d'epaississement dans une usine de fabrication d'alumine par le procede ...
openaire   +1 more source

Bayer Process—Water and Energy Balance

2022
Robert LaMacchia, Raphael Costa
openaire   +1 more source