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Recovery of iron from bauxite residue using advanced

2019-4-1 · Using physical methods, iron-rich bauxite residue can be separated and may be utilized as low-grade iron ore. In the paper, advanced physical recovery techniques such as multistage magnetic separation, use of carbon-containing wastes as reducing agents and

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Reduction of chlorine in bauxite residue by fine

2005-4-4 · The reduction of chlorine in bauxite residue (BR) through the use of physical separation techniques is investigated here for utilizing some of the large quantities of this residue generated by the production of aluminum. Samples provided by three companies were separated by wet sieving and hydraulic separation using a cyclone system.

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Dealkalization processes of bauxite residue: A

2021-2-5 · Bauxite residue (BR) is a kind of alkaline solid waste generated from the alumina refining industry (Zhu et al., 2016a; Liu et al., 2007; Khairul et al., 2019; Zhang et al., 2016). Bauxite residue is also known as red mud, which is named because it is mostly red silty for containing a certain amount of iron oxide (Aluminium, 2015).

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Iron Recovery from Bauxite Residue Through Reductive

2019-2-13 · Techniques investigated for iron recovery from bauxite residue are mainly based on pyrometallurgical processes where iron oxides are either reduced in the solid state followed by magnetic separation or reduced by smelting in Electric Arc [12, 13] or other type of furnace [7, 14].

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Iron Recovery from Bauxite Residue Through

2018-6-20 · The scope of this work is to develop and optimize a reductive roasting process followed by wet magnetic separation for iron recovery from bauxite residue (BR). The aim of the roasting process is the transformation of the nonmagnetic iron phases found in BR (namely hematite and goethite), to magnetic ones such as magnetite, wüstite, and metallic iron.

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THE IMPACT OF DESILICATION PRODUCT ON BAUXITE

1.2 Bauxite residue fl occulation Achieving rapid solid-liquid separation between digestion and precipitation is critical, given the super-saturated state of the liquors. A large number of studies have sought to identify the causes of poor solid-liquid separation performance from bauxite residue fl occulation. From these it is known that

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New PhD on REE recovery from bauxite residue

2018-8-2 · Efficient separation of rare earths recovered by a supported ionic liquid from bauxite residue leachate, RSC Advances, 8, 11886–11893. Avdibegović,Regadío M., Rivera R.M., Onoughene G., Van Gerven T., Binnemans K., Purification of low concentration of rare earths from high concentration impurities in leach liquor of bauxite residue slag

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Recovery of Rare Earths and Major Metals from

2016-11-18 · Bauxite residues that are generated from karst bauxite ores are rich in REEs. Currently, scandium represents more than 90% of the total value of the REEs present in bauxite residue. REEs can be recovered from the bauxite residue by direct acid leaching [ 4 7 ]. However, the recovery yields are poor at low acid concentrations.

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Understanding desilication products in bauxite refinery

2016-10-27 · Dense media separation was used to isolate DSP in an Australian bauxite residue and then compared with synthetic versions. Structural, chemical and morphological changes induced by different Bayer digestion conditions (temperature, reaction time, addition of lime, A/C ratio and) and silicate source (kaolinite and quartz) have been investigated.

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Efficient separation of rare earths recovered by a

Bauxite residue (BR) contains substantial concentrations of rare-earth elements (REEs), but their recovery is a challenge. Acidic BR leachates typically comprise much higher concentrations of base elements (g L −1) than those of the REEs (ppm).Thus, adsorbents that are highly selective for the REEs over the base elements are required for the separation.

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Separation of REEs from bauxite residue leachate

This novel chromatographic method is promising for efficient separation and purification of REEs. Full reference paper. Dženita Avdibegović, Mercedes Regadío and Koen Binnemans, Efficient separation of rare earths recovered by a supported ionic liquid from bauxite residue leachate, RSC Advances, 8, 11886, 10.1039/C7RA13402A. Bio main author

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THE IMPACT OF DESILICATION PRODUCT ON BAUXITE

1.2 Bauxite residue fl occulation Achieving rapid solid-liquid separation between digestion and precipitation is critical, given the super-saturated state of the liquors. A large number of studies have sought to identify the causes of poor solid-liquid separation performance from bauxite residue fl occulation. From these it is known that

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New PhD on REE recovery from bauxite residue

2018-8-2 · Efficient separation of rare earths recovered by a supported ionic liquid from bauxite residue leachate, RSC Advances, 8, 11886–11893. Avdibegović,Regadío M., Rivera R.M., Onoughene G., Van Gerven T., Binnemans K., Purification of low concentration of rare earths from high concentration impurities in leach liquor of bauxite residue slag

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In situ remediation of bauxite residue by sulfuric acid

2020-1-3 · In situ remediation of bauxite residue by sulfuric acid leaching and bipolar-membrane electrodialysis Mayuko Kishidaa, Takuo Haratob,⁎, Chiharu Tokoroc, Shuji Owadac a Department of Resources and Environmental Engineering, School of Creative Science and Engineering, Waseda University, Tokyo 169-8555, Japan b Environmental Research Institute, Waseda University, Tokyo

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Understanding desilication products in bauxite refinery

2016-10-27 · The presence of desilication products in bauxite residue poses many drawbacks in rehabilitation programs (leachates and pH fluctuations), as well as in storage facilities (pH reversion) [3, 4, 12-15]. Desilication products make up a large portion of the alkali compounds found in bauxite residue; 0-24% sodalite and 0-

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Extraction of Alumina from the Magnetic Separation

2016-2-7 · Much work has been done to recycle iron from bauxite residue via reductive roasting‐magnetic separation process, of which more than 85% iron could be recycled as powdered metallic iron, but insufficient efforts have been made to utilize the magnetic separation tailings which were rich in valuable components like aluminum, titanium etc.

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Efficiency of Sulfuric Acid on Selective Scandium

2019-9-4 · Bauxite residue (BR), also called red mud, is the highly alkaline (pH>11) and very fine-grained resulted to the development of an innovative method for the selective separation and purification of REEs and especially Sc, including nitric acid leaching, ion exchange, selective extraction-

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Recovery of scandium from leachates of Greek bauxite

2015-11-10 · Bauxite residue (red mud) is a waste residue that results from the production of alumina by the Bayer process. Since it has no large-scale industrial application, it is stockpiled in large reservoirs. Nevertheless, it should be considered as a valuable secondary resource as it

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Optimizing Conditions for Scandium Extraction from

Bauxite residue is the voluminous by-product of alumina production after Bayer process. Its high alkalinity causes disposal problems and harmful environmental impacts. However, the residue contains significant amounts of valuable elements, such as rare earth elements, including scandium. Greek bauxite residue contains a high amount of scandium close to its main resources.

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