Role of Aspergillus niger in recovery enhancement of valuable metals from produced red mud in Bayer process

2016 ◽  
Vol 218 ◽  
pp. 991-998 ◽  
Author(s):  
F. Vakilchap ◽  
S.M. Mousavi ◽  
S.A. Shojaosadati
Keyword(s):  
Aspergillus Niger ◽  
Red Mud ◽  
Bayer Process ◽  
Valuable Metals

Preparation and Fixation Ability for Pb2+ of Geopolymeric Material Based on Bayer Process Red Mud

2014 ◽  
Vol 1049-1050 ◽  
pp. 175-179 ◽  
Author(s):  
Xiang Li Xie ◽  
Peng Peng ◽  
Wen Feng Zhu ◽  
Lin Iang Wang
Keyword(s):  
Compressive Strength ◽  
Aqueous Phase ◽  
Red Mud ◽  
Bayer Process ◽  
Curing Method ◽  
Metakaolin Geopolymer

Geopolymeric material (geopolymer) was synthesized by casting and curing method using Bayer process red mud and metakaolin as starting materials. The fixation ability of the geopolymer for Pb2+ was studied by leaching method. The results shown that metakaolin played the role of aluminum and silicon donor during the initial strong alkaline aqueous phase. Red mud had principally the role of filler, increasing in this way the final compressive strength of the geopolymer. The compress strength of geopolymer curing 3 days from metakaolin and red mud mixture is 66MPa. The leaching concentration of Pb2+ from 50% red mud geopolymer is 0.891mg/L as the Pb2+ content in geopolymer is 2.5%; the metakaolin-red mud geopolymer has better Pb2+ fixation ability than metakaolin geopolymer.

scholarly journals Assessing the role of bed sediments in the persistence of red mud pollution in a shallow lake (Kinghorn Loch, UK)

2017 ◽  
Vol 123 ◽  
pp. 569-577 ◽  
Author(s):  
Justyna P. Olszewska ◽  
Kate V. Heal ◽  
Ian J. Winfield ◽  
Lorna J. Eades ◽  
Bryan M. Spears
Keyword(s):  
Shallow Lake ◽  
Red Mud ◽  
Bed Sediments

Red Mud Flocculants Used in the Bayer Process

2013 ◽  
pp. 425-430
Author(s):  
F. Ballentine ◽  
M. E. Lewellyn ◽  
S. A. Moffatt
Keyword(s):  
Red Mud ◽  
Bayer Process

scholarly journals Role of Iron in Hydrogen Sulphide Removal from Hot Gas

1987 ◽  
Vol 4 (4) ◽  
pp. 230-240 ◽  
Author(s):  
E. Furimsky ◽  
A. Palmer ◽  
M.E. Brett ◽  
R. Provencher ◽  
M. Yumura
Keyword(s):  
Mössbauer Spectroscopy ◽  
Hydrogen Sulphide ◽  
Red Mud ◽  
Mossbauer Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Component Distribution ◽  
Hot Gas ◽  
Fe Oxides

Yields of SO2 formed during H2S removal from N2 + H2S mixture at 800°C in the presence of Fe2O3, Mn-nodule and red mud have been determined. The largest yields were observed for Fe2O3 followed by Mn-nodule, whereas no SO2 was detected in the presence of red mud. A mechanism for H2S reaction with Fe oxides has been proposed involving the use of the component distribution in the clean gas as well as the Fe sulphides formed during adsorption. X-ray diffraction and Mossbauer spectroscopy have been used to determine the forms of Fe in the solids at the end of adsorption. FeS was the main sulphide which was always accompanied by FeS2.

scholarly journals Effect of red mud addition on the corrosion parameters of reinforced concrete evaluated by electrochemical methods

2012 ◽  
Vol 5 (4) ◽  
pp. 451-467 ◽  
Author(s):  
D.V. Ribeiro ◽  
J.A. Labrincha ◽  
M.R. Morelli
Keyword(s):  
Electrical Resistivity ◽  
Reinforced Concrete ◽  
Red Mud ◽  
Corrosion Potential ◽  
Corrosion Process ◽  
Bayer Process ◽  
Alumina Production ◽  
High Ph ◽  
High Electrical Resistivity ◽  
Bauxite Ore

Red mud, the main waste generated in aluminum and alumina production from bauxite ore by the Bayer process, is considered "hazardous" due to its high pH. The high pH also provides greater protection of rebars, which is reflected in the low corrosion potential and high electrical resistivity (filler effect) of concrete. The corrosion potential was monitored by electrochemical measurements and the electrical resistivity was evaluated using sensors embedded in concrete test specimens. The results showed that the addition of red mud is beneficial to concrete, reducing its corrosion potential and increasing its electrical resistivity. Red mud proved to be a promising additive for concrete to inhibit the corrosion process.

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