Recovery of Strategic Materials from Canadian Bauxite Residue by Smelting Followed by Acid Baking–Water Leaching

2020 ◽  
pp. 139-150
Author(s):  
John Anawati ◽  
Gisele Azimi
Keyword(s):  
Bauxite Residue ◽  
Water Leaching

Extraction of rare earths from bauxite residue (red mud) by dry digestion followed by water leaching

2018 ◽  
Vol 119 ◽  
pp. 82-92 ◽  
Author(s):  
Rodolfo Marin Rivera ◽  
Brecht Ulenaers ◽  
Ghania Ounoughene ◽  
Koen Binnemans ◽  
Tom Van Gerven
Keyword(s):  
Rare Earths ◽  
Red Mud ◽  
Bauxite Residue ◽  
Water Leaching ◽  
Dry Digestion

Migration and distribution of saline ions in bauxite residue during water leaching

2018 ◽  
Vol 28 (3) ◽  
pp. 534-541 ◽  
Author(s):  
Xiang-feng KONG ◽  
Xing-xing JIANG ◽  
Sheng-guo XUE ◽  
Ling HUANG ◽  
William HARTLEY ◽  
...  
Keyword(s):  
Bauxite Residue ◽  
Water Leaching

Fresh Water Leaching of Alkaline Bauxite Residue after Sea Water Neutralization

2009 ◽  
Vol 38 (5) ◽  
pp. 2050-2057 ◽  
Author(s):  
Neal W. Menzies ◽  
Ian M. Fulton ◽  
Rosemary A. Kopittke ◽  
Peter M. Kopittke
Keyword(s):  
Fresh Water ◽  
Sea Water ◽  
Bauxite Residue ◽  
Water Leaching

scholarly journals H2-Based Processes for Fe and Al Recovery from Bauxite Residue (Red Mud): Comparing the Options

2021 ◽  
Vol 5 (1) ◽  
pp. 45
Author(s):  
Stergi Kapelari ◽  
Platon N. Gamaletsos ◽  
Tom Van Der Donck ◽  
Yiannis Pontikes ◽  
Bart Blanpain
Keyword(s):  
Magnetic Separation ◽  
Bauxite Residue ◽  
Melting Process ◽  
Water Soluble ◽  
Magnetic Fraction ◽  
Water Leaching ◽  
Alumina Production ◽  
Produce Water ◽  
Fe Content ◽  
Water Media

To tackle the challenge of bauxite residue (BR), generated during the alumina production, as well as to recover some of its metal content, three combinatory H2-based processes were utilized. Firstly, Greek BR was mixed with NaOH to produce water soluble Na-aluminates and was roasted under pure H2 gas in order to reduce the Fe+3 content. Then the first process combined water leaching and magnetic separation, the second water leaching and melting and the last included wet magnetic separation. The water media resulted in the dissolution of Na-aluminate phases and the production of Al, Na-ion rich leachates. From these, pregnant leaching solutions recovery of Al was 78%, 84% and for the third case it reached 91%. Concerning Na recovery, it could reach 94%. Both melting process and magnetic separation aimed for Fe recovery from the material. The former case however still needs to be optimized, here its concept is introduced. The magnetic fraction, after the dry magnetic separation, varied in Fe content from 31.57 wt.% to 38.50 wt.%, while after the wet magnetic separation it reached 31.85 wt.%.

Effect of water leaching on the adhesion of composite resin to bleached and unbleached bovine enamel

1991 ◽  
Vol 17 (4) ◽  
pp. 156-160 ◽  
Author(s):  
C.D. Torneck ◽  
K.C. Titley ◽  
D.C. Smith ◽  
A. Adibfar
Keyword(s):  
Composite Resin ◽  
Water Leaching ◽  
Effect Of Water ◽  
Bovine Enamel

scholarly journals Effect of Water Leaching on Photodegraded Scots Pine and Spruce Timbers Monitored by FTIR Spectroscopy

Forests ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 833
Author(s):  
Edina Preklet ◽  
László Tolvaj ◽  
Eszter Visi-Rajczi ◽  
Tamás Hofmann
Keyword(s):  
Ftir Spectroscopy ◽  
Scots Pine ◽  
Uv Irradiation ◽  
Chemical Elements ◽  
Uv Light ◽  
Carbonyl Groups ◽  
Water Leaching ◽  
Absorption Bands ◽  
Chemical Changes ◽  
Absorption Increase

The goal of this research was the systematic study and comparison of the divided individual effects of UV light irradiation and water leaching during artificial weathering. Spruce (Picea abies Karst.) and Scots pine (Pinus sylvestris L.) samples were irradiated by ultraviolet (UV) light. Another sequence of samples was treated with the combination of UV irradiation and water leaching. The total extent of UV treatment was 20 days for both series of samples. Time relation of UV irradiation and water leaching was 2:1. The chemical changes were observed by FTIR spectroscopy. The difference spectrum was used for determination of the chemical changes. Degradation of lignin was greater for the leached samples than for the pure UV treated samples. Scots pine suffered greater lignin degradation than spruce, and produced higher absorption increase on the absorption region of unconjugated carbonyls. The unconjugated carbonyl groups were the most responsive chemical elements to leaching. Spruce was more susceptible to leaching of unconjugated carbonyl groups than Scots pine. Two absorption bands of unconjugated carbonyl groups at 1706 and 1764 cm−1 wavenumbers were produced by photodegradation. The absorption band at 1764 cm−1 was more sensitive to water leaching than the band at 1706 cm−1.

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