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bauxite residue leaching in sulfuric acid

In situ remediation of bauxite residue by sulfuric acid ...

Washing remediated the residue to accomplish the goals for bauxite residue rehabilitation. Furthermore, sodium hydroxide and sulfuric acid were recovered by bipolar-membrane electrodialysis.

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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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In situ remediation of bauxite residue by sulfuric acid ...

2017-7-1  In situ remediation of a bauxite residue by integrating a storage area with CSIRO's soda recovery process was evaluated. The process consisted of the following steps: bauxite residue is neutralized with sulfuric acid; the slurry is separated into a neutralized residue and a leachate. The residue is sent to a storage area and washed with rainfall.

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Effect of temperature on iron leaching from bauxite ...

Bauxite residue, as solid waste from alumina production, contains mainly hematite [Fe2O3]. Kinetic study of iron leaching of bauxite residue by diluted sulfuric acid at atmospheric pressure has been investigated. The results have been obtained as following: (i) Temperature play an important role in

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Effect of Temperature on Iron Leaching from Bauxite ...

Bauxite residue, as solid waste from alumina production, contains mainly hematite [Fe2O3]. Kinetic study of iron leaching of bauxite residue by diluted sulfuric acid at atmospheric pressure has ...

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Hydrometallurgical Extraction of Scandium from Bauxite ...

In this study, scandium extraction from Bauxite residue based on sulfuric acid leaching is presented. Scandium dissolves at elevated temperatures under high acid concentration reaching recovery ...

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Effect of Temperature on Iron Leaching from Bauxite ...

2008-10-23  Bauxite residue, as solid waste from alumina production, contains mainly hematite [Fe2O3]. Kinetic study of iron leaching of bauxite residue by diluted sulfuric acid at atmospheric pressure has been investigated. The results have been obtained as following: (i) Temperature play an important role in iron leaching from bauxite residue. Higher temperature is favor of Fe (III) leaching from ...

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Selective recovery of rare earths from bauxite residue by ...

2016-6-1  The sulfuric acid to bauxite residue mass ratio was fixed at 1:1. In Fig. 8, REEs and major element dissolutions are given with respect to leaching time for non-agitated room-temperature leaching. It can be seen that the leaching time has an important influence on the dissolution behavior of the REEs.

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Leaching of rare earths from bauxite residue (red mud ...

2015-5-15  Increasing the leaching temperature did not improve recoveries for mineral acids at 0.5 N, but it helped in the case of citric acid leaching: the REE leaching results for citric acid above 90 °C were comparable those for mineral acids at 25 °C. The leaching data show that scandium in bauxite residue is very closely associated with iron.

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Acid transformation of bauxite residue: Conversion of its ...

2017-2-15  Bauxite residue (BR, or red mud) is an alkaline solid waste generated during alumina extraction from bauxite using the Bayer, sintering and Bayer-sintering processes in refineries. The volume of bauxite residue generated per ton of alumina product is approximately 0.5–2 tons , , . Raising demand for alumina worldwide has increased the rate of ...

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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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In situ remediation of bauxite residue by sulfuric acid ...

In situ remediation of a bauxite residue by integrating a storage area with CSIRO's soda recovery process was evaluated. The process consisted of the following steps: bauxite residue is neutralized with sulfuric acid; the slurry is separated into

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Efficiency of Sulfuric Acid on Selective Scandium ...

2019-9-4  process, using sulfuric acid at low acid molarities under ambient conditions was integrated rapidly leading to high and selective Sc recovery. A flow diagram of the developed leaching process in industrial scale was proposed based on continuous operation. Keywords: bauxite residue; scandium; leaching; sulfuric acid 1. Introduction

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Metals Free Full-Text Efficiency of Sulfuric Acid on ...

Bauxite residue (BR) is a well promising resource for critical metals, especially scandium (Sc), a rare and expensive metal with increasing applications in advanced technology. Greek BR seems to significantly favor a commercially viable recovery of Sc combining optimized leaching and advanced separation techniques. Leaching with mineral acids emerges as the dominant selection compared to other ...

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RECOVERY OF SODA FROM BAUXITE RESIDUE BY ACID

containing BR using sulphuric acid without troublesome leaching of silica. A soda extraction extent of up to 80% was achieved by stoichiometric consumption of sulphuric acid to form sodium sulphate with DSP or lime-free BR. For the lime containing BR, ~1.6 times more acid was consumed in leaching because of lime-acid reactions. The resultant liquor

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A Mineralogical Assessment on Residues after Acidic ...

2017-12-8  A typical leaching test was performed with a heating plate and magnetic stirrer to control the temperature and stirring speed. The leaching efficiencies of sulfuric acid, hydrochloric acid and a combination of the two acids in the ratio of hydrochloric acid to sulfuric acid of 1:3 were investigated with the same leaching parameters.

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IN-SITU REMEDIATION OF BAUXITE RESIDUE (BR) BY

2021-9-27  The authors acquired a process idea of in-situ remediation of BR by integrating bauxite residue storage area (BRSA) with CSIRO’s soda recovery process (WO 2012/145797), which comprises the following steps: (1) neutralizing BR with sulfuric acid (sodium of DSP is extracted as sodium sulfate into the leachate), (2) sending the neutralized BR (NBR) slurry to BRSA equipped with under-drainage ...

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Efficiency of Sulfuric Acid on Selective Scandium ...

Bauxite residue (BR) is a well promising resource for critical metals and especially scandium (Sc), a rare and expensive metal with increasing applications in advanced technology. Particularly, Greek BR’s composition indicates a sound possibility for a commercially viable recovery of Sc under the conditions of an optimized leaching process and the subsequent use of advanced separation ...

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Recovery of Alumina from Khushab Baux ite by Leaching

2020-10-5  grade bauxite ore is also present in same area [6]. The present experimental work was of preliminary type and was planned to investigate the recovery of alumina from highly salacious bauxite ore by using sulfuric acid. So that large deposits of low grade bauxite present at different locations of Pakistan may be exploited.

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BAUXITE RESIDUE RECYCLING - Worcester Polytechnic

Sulfuric acid is added to the scandium rich filtrate to reduce the pH to 1, and scandium oxalate is precipitated by addition of oxalic acid. Configurations herein are based, in part, on the observation that rare earths including scandium have been discarded in bauxite reside (red mud) as a by-product of aluminum production.

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In situ remediation of bauxite residue by sulfuric acid ...

In situ remediation of a bauxite residue by integrating a storage area with CSIRO's soda recovery process was evaluated. The process consisted of the following steps: bauxite residue is neutralized with sulfuric acid; the slurry is separated into

Read More
RECOVERY OF SODA FROM BAUXITE RESIDUE BY ACID

containing BR using sulphuric acid without troublesome leaching of silica. A soda extraction extent of up to 80% was achieved by stoichiometric consumption of sulphuric acid to form sodium sulphate with DSP or lime-free BR. For the lime containing BR, ~1.6 times more acid was consumed in leaching because of lime-acid reactions. The resultant liquor

Read More
IN-SITU REMEDIATION OF BAUXITE RESIDUE (BR) BY

2021-9-27  The authors acquired a process idea of in-situ remediation of BR by integrating bauxite residue storage area (BRSA) with CSIRO’s soda recovery process (WO 2012/145797), which comprises the following steps: (1) neutralizing BR with sulfuric acid (sodium of DSP is extracted as sodium sulfate into the leachate), (2) sending the neutralized BR (NBR) slurry to BRSA equipped with under-drainage ...

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Extraction of rare earths from bauxite residue – European ...

2021-8-26  The preliminary comparative economic analysis has shown that dry digestion with sulfuric acid and multi-stage leaching is the most interesting method for the extraction of scandium and titanium from bauxite residue. However, this method still needs more

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Effect of temperature on iron leaching from bauxite ...

Bauxite residue, as solid waste from alumina production, contains mainly hematite [Fe2O3]. Kinetic study of iron leaching of bauxite residue by diluted sulfuric acid at atmospheric pressure has been investigated. The results have been obtained as following: (i) Temperature play an important role in iron leaching from bauxite residue.

Read More
Recovery of Alumina from Khushab Baux ite by Leaching

2020-10-5  grade bauxite ore is also present in same area [6]. The present experimental work was of preliminary type and was planned to investigate the recovery of alumina from highly salacious bauxite ore by using sulfuric acid. So that large deposits of low grade bauxite present at different locations of Pakistan may be exploited.

Read More
Efficiency of Sulfuric Acid on Selective Scandium ...

2018-10-3  Bauxite residue (BR) is a well promising resource for critical metals and especially scandium (Sc), a rare and expensive metal with increasing applications in advanced technology. Particularly, Greek BR’s composition indicates a sound possibility for a commercially viable recovery of Sc under the conditions of an optimized leaching process ...

Read More
BAUXITE RESIDUE RECYCLING - Worcester Polytechnic

Sulfuric acid is added to the scandium rich filtrate to reduce the pH to 1, and scandium oxalate is precipitated by addition of oxalic acid. Configurations herein are based, in part, on the observation that rare earths including scandium have been discarded in bauxite reside (red mud) as a by-product of aluminum production.

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BR07 - The International Committee for Study of Bauxite ...

2020-12-21  One of the primary challenges associated with the direct acid baking ± water leaching of bauxite residue for the recovery of scandium is the co-extraction of iron during leaching. In bauxite residue, scandium is closely associated with the iron-bearing phases. [5,11] Thus, any technique

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Leaching of Metals from Hydrometallurgical Residue by ...

2019-8-24  leaching in (0.25, 0.5, 1 and 2 (mol.L-1)) sulfuric acid solutions. The subsequent leaching was performed in the optimized acid concentrations at temperatures of (25, 45, 65 and 85 °C) for (0.5, 1, 1.5 and 2 hour) at each temperature. A variable speed stirrer operated at a speed of 100rpm was maintained during in all leaching experiments at 1MPa.

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