Results 181 to 190 of about 7,380 (225)

Extraction and Utilization of Valuable Elements from Bauxite and Bauxite Residue: A Review

Bulletin of Environmental Contamination and Toxicology, 2022
Bauxite is the ideal raw material for the manufacturing of alumina. Aside from the primary constituents of aluminum and silicon, bauxite is frequently coupled with many valuable elements such as gallium (Ga), titanium (Ti), scandium (Sc), and lithium (Li).
Yang, Chen, Ting-An, Zhang, Guozhi, Lv, Xi, Chao, Xuewei, Yang   +4 more
openaire   +2 more sources

Revealing the Mechanisms of Metal Adsorption by Bauxite Residue

Industrial & Engineering Chemistry Research, 2023
Acid treatment of bauxite residue (BR) has been one of the main approaches to enhance its metal adsorption performance. However, the acid treatment mechanisms remain poorly understood and is complicated by the variable and complex mineralogy of bauxite residue and different test conditions in previous studies.
Hong Peng, Ngoc Quy Vu, James Vaughan, Sicheng Wang, Shuai Gao   +4 more
openaire   +3 more sources

Kinetics of Bauxite Residue Sintering

2018
In the Bayer process for alumina production, between 2–35% Al2O3 is lost with bauxite residue due primarily to incomplete dissolution of aluminium-bearing minerals during caustic leaching or the precipitation of sodium alumino-silicate solids. The recovery of sodium and aluminium from the residue, and particularly from the contained sodium alumino ...
Hodge, Harrison, Hawker, William, Hayes, Peter, Vaughan, James   +3 more
openaire   +2 more sources

Bauxite Residue Management

2012
With some two to four tonnes of bauxite residue arising for every tonne of aluminium produced, the management of bauxite residue (or Red Mud) has always been a significant issue for the aluminium industry. However, the tragic fatal incident in Ajka, Hungary in October 2010 has reinforced the need for safe and effective management of storage areas ...
Ken Evans, Eirik Nordheim, Katy Tsesmelis   +2 more
openaire   +1 more source

In situ neutralisation of uncarbonated bauxite residue mud by cross layer leaching with carbonated bauxite residue mud

Journal of Hazardous Materials, 2011
Unameliorated residue mud from the Bayer process generates highly alkaline leachates (pH ca. 13) after deposition in storage areas. Pre-deposition treatment of bauxite residue mud (BRM) with CO(2) gas (carbonation) lowers leachate pH to ca. 10.5. Laboratory scale leaching columns were used to investigate the potential for in situ pH reduction in ...
Santini, T. C., Hinz, C., Rate, A. W., Carter, C. M., Gilkes, R. J.   +4 more
openaire   +5 more sources

Treatment of bauxite residue

2022
A method for treating bauxite residue contained in a storage facility comprising adding a mixture containing (a) a source of organic carbon, (b) a source of phosphorous or a source of phosphate, (c) a source of calcium, and a source of sulphur or sulphate to the bauxite residue, to thereby promote growth of microbes well adapted to highly saline and ...
Huang, Longbin, You, Fang
openaire   +1 more source

A field assessment of bauxite residue rehabilitation strategies

Science of The Total Environment, 2019
Bauxite residue, the by-product of the alumina industry, is mainly stored in land-based bauxite residue disposal areas (BRDAs). Environmental concern has been raised due to the large volumes in stockpile, the high alkalinity of the material, as well as the presence of elevated concentrations of trace elements.
Elisa Di Carlo, Amiel Boullemant, Ronan Courtney   +2 more
openaire   +2 more sources

Manufactured soil: A new use for bauxite residue

Science of The Total Environment
Bauxite processing residue produced at an Alumina refinery was used to produce manufactured soil. The residue was first acidified and then leached to remove excess salts. Green waste compost was added at rates of 5 and 10 % w/w, with or without the addition of 20 % w/w dune sand.
Weng, X., Haynes, R. J., Zhou, Y. F.
openaire   +3 more sources

Alkalinity conversion of bauxite refinery residues by neutralization

Journal of Hazardous Materials, 2010
Red mud remains the largest environmental issue for the alumina industry due to its high pH (>13), fine-grained nature (>90% is 50 g/kg), and soluble alkalinity (approximately 30 g/kg as equivalent CaCO(3)), which reduce the transport and reuse options of red mud.
Johnston, M, Clark, M W, McMahon, P, Ward, N   +3 more
openaire   +3 more sources

A Study of the Occurrence of Selected Rare-Earth Elements in Neutralized–Leached Bauxite Residue and Comparison with Untreated Bauxite Residue

Journal of Sustainable Metallurgy, 2019
This study investigates the chemical associations of the selected rare-earth elements (Sc, Y, Ce, La, and Nd) with major element phases in the postprocessed bauxite residues and compares them with the untreated bauxite residue. The treatment of bauxite residue considers our previous published process which involved the neutralization with CO2, followed
Rivera, Rodolfo Marin, Ounoughene, Ghania, Malfliet, Annelies, Vind, Johannes, Panias, Dimitris, Vassiliadou, Vicky, Binnemans, Koen, Van Gerven, Tom   +7 more
openaire   +1 more source