bauxite residue leaching

bauxite residue leaching

Leaching of rare earths from bauxite residue (red mud

2015-05-15· Bauxite residue (or red mud) is a waste generated during the Bayer process of alumina production. Its storage is a spatial and environmental concern. Currently, there are no bulk applications of bauxite residue except for minor use in cements and ceramics. Nonetheless, some types of bauxite residues are rich in rare-earth elements (REEs), and the extraction of scandium in particular

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LEACHING ASSESSMENT METHODOLOGIES FOR DISPOSAL AND

2013-11-21· Extraction from bauxite is a primary process for production of aluminum, which results in the formation of large quantities of waste that are then typically stored in disposal sites near the production facilities. The international annual bauxite residue production is approximately 120 Mt. The cumulative amount of bauxite residue disposed prior to 2009 is more than 2500 Mt.

Leaching Behavior of Lithium from Bauxite Residue Using

2020-01-10· Bauxite residue (red mud) is an alkaline waste derived from the industrial process for extraction of alumina from bauxite ore. Some bauxite residues contain considerable concentrations of critical metals, for example, rare earth elements. Lithium in red mud was also reported as a potential resource. In the current study, a Li-rich red mud was leached using acetic acid to investigate the

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Leaching of rare earths from bauxite residue (red mud

The traditional process for extraction of scandium from bauxite residue is direct acid leaching, followed by solvent extraction or ion exchange adsorption (Liu et al., 2019; Borra et al., 2015

(PDF) Effects of Leaching on the Chemical and Physical

Bauxite residue is a high volume by-product of alumina manufacture which is commonly disposed of in purpose-built bauxite residue disposal areas (BRDAs). Natural waters interacting with bauxite

Leaching optimization and dissolution behavior of alkaline

2018-06-01· Bauxite residue is a highly alkaline waste containing soluble alkaline anions, which can cause environmental concerns. The optimal leaching conditions, distribution of alkaline anions, types of pivotal alkaline anions and their dissolution behaviors were investigated based on the combination of single factors-orthogonal experiments and leaching stage experiment. Using a two-stage leaching,

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Effect of temperature on iron leaching from bauxite

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 bauxite residue. (ii) The leaching process is applicable to the intra-particle diffusion model and

Leaching of rare earths from bauxite residue (red mud)

Bauxite residue Lanthanides Leaching Rare earths Red mud Waste processing abstract Bauxite residue (or red mud) is a waste generated during the Bayer process of alumina production. Its storage is a spatial and environmental concern. Currently, there are no bulk applications of bauxite res-idue except for minor use in cements and ceramics. Nonetheless, some types of bauxite residues are rich in

Leaching of rare earths from bauxite residue (red mud)

Neither has much work been done on leaching of major elements from bauxite residue nor leaching of REEs by organic acids. Study on the leaching of major elements is, however, useful for the development of the further purification process. Therefore, in this study we systematically investigated the extraction of REEs as well as other major elements in organic and mineral acids (HCl, HNO 3, H 2

(PDF) Effects of Leaching on the Chemical and Physical

Effects of Leaching on the Chemical and Physical Properties of Bauxite Residue Mud and Sand January 2018 International Journal of Environmental Science and Development 9(12):375-379

(PDF) In situ remediation of bauxite residue by sulfuric

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

(PDF) In situ neutralization of bauxite residue mud ('red

Cross layer leaching is an effective treatment for the in [1] Benison & Goldstein (1999) Chemical Geology 154, 113– situ neutralisation of uncarbonated bauxite residue deposits. 132. [2] Milne (1978) The potash deposits & their associates Leachate pH was significantly lower (p<0.05) in dual layer in the area of the Boulby Mine, Cleveland. PhD. [3] Taylor residue systems than single layer

[PDF] Leaching optimization and dissolution behavior of

Abstract Bauxite residue is a highly alkaline waste containing soluble alkaline anions, which can cause environmental concerns. The optimal leaching conditions, distribution of alkaline anions, types of pivotal alkaline anions and their dissolution behaviors were investigated based on the combination of single factors-orthogonal experiments and leaching stage experiment. Using a two-stage

ARTICLE: Addressing the Challenge of Bauxite Residue

2019-03-11· Bonomi, C., et al. “Scandium and Titanium Recovery from Bauxite Residue by Direct Leaching with a Brønsted Acidic Ionic Liquid,” Metals 2018, 8, 834, 2018, pp. 1-17. Liu, Z., et al., “Selectively recovering scandium from high alkali Bayer red mud without impurities of iron, titanium and gallium,” Journal of Rare Earths , Vol. 35, Issue 9, September 2017, pp. 896-905.

RECOVERY OF SODA FROM BAUXITE RESIDUE BY ACID LEACHING

The authors have developed a new process to recover soda from desilication product (DSP) in bauxite residue (BR), which comprises the following steps: (1) leaching DSP by sulphuric acid to extract soda as sodium sulphate, (2) purifi cation of the leached liquor and (3) splitting the sodium sulphate into caustic soda and sulphuric acid by electrochemical processing. The recovered NaOH is

Red mud Wikipedia

Red mud, formally termed bauxite residue, is an industrial waste generated during the processing of bauxite into alumina using the Bayer process.It is composed of various oxide compounds, including the iron oxides which give its red colour. Over 95% of the alumina produced globally is through the Bayer process; for every tonne of alumina produced, approximately 1 to 1.5 tonnes of red mud are

Ionometallurgical Leaching Process of Bauxite Residue: a

Bauxite residue (BR) is the major product of the by-ali leaching of bauxitealk , through the Bayer processfor alumina production, ; for ach tonne of aluminae , 1 – 1.5 tonnes of BR is generated [1]. It is estimated that worldwide BR production is over 150 million tonnes per year [2]. Since it consists of base metals likeiron (Fe), aluminium (Al), sodium (Na),silicon (Si), calcium (Ca) and

Leaching of rare earths from bauxite residue (red mud)

Neither has much work been done on leaching of major elements from bauxite residue nor leaching of REEs by organic acids. Study on the leaching of major elements is, however, useful for the development of the further purification process. Therefore, in this study we systematically investigated the extraction of REEs as well as other major elements in organic and mineral acids (HCl, HNO 3, H 2

Leaching of rare earths from bauxite residue (red mud)

Bauxite residue Lanthanides Leaching Rare earths Red mud Waste processing abstract Bauxite residue (or red mud) is a waste generated during the Bayer process of alumina production. Its storage is a spatial and environmental concern. Currently, there are no bulk applications of bauxite res-idue except for minor use in cements and ceramics. Nonetheless, some types of bauxite residues are rich in

In situ remediation of bauxite residue by sulfuric acid

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 169-8555, Japan

Mining and Refining – Bauxite Residue Management

Critically, leaching of salts resulting from pH reduction must occur and drainage and disposal of saline leachate is essential. Supplementation of natural rainfall with irrigation may be needed to accelerate the process along with tillage and other physical treatments to improve structure and porosity. Utilisation of Bauxite Residue

(PDF) In situ remediation of bauxite residue by sulfuric

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

[PDF] Leaching optimization and dissolution behavior of

Abstract Bauxite residue is a highly alkaline waste containing soluble alkaline anions, which can cause environmental concerns. The optimal leaching conditions, distribution of alkaline anions, types of pivotal alkaline anions and their dissolution behaviors were investigated based on the combination of single factors-orthogonal experiments and leaching stage experiment. Using a two-stage

RECOVERY OF SODA FROM BAUXITE RESIDUE BY ACID LEACHING

The authors have developed a new process to recover soda from desilication product (DSP) in bauxite residue (BR), which comprises the following steps: (1) leaching DSP by sulphuric acid to extract soda as sodium sulphate, (2) purifi cation of the leached liquor and (3) splitting the sodium sulphate into caustic soda and sulphuric acid by electrochemical processing. The recovered NaOH is

Extraction of rare earths from bauxite residue (red mud

Direct leaching experiments of bauxite residue are per-formed with HCl and H 2SO 4 at different concentrations in order to study the behaviour of silicon during acid leaching over time. A multi-stage leaching was applied after dry digestion to increase the REEs concentration in the leachate. The process has been compared with the conventional direct acidic leaching method in terms of selected

Recovery of Gallium from Bauxite Residue Using

Al and Fe leaching were also investigated as they were major elements in the bauxite residue and their leaching selectivity is an important factor. Using 1 M (2 N) H 2 C 2 O 4, 54% (~ 49,802 mg/kg) Al and 23% (~ 81,563 mg/kg) Fe were also coextracted under the above conditions (SI, Table 4). Effect of Leaching Parameters . The effect of acid concentration, temperature, contact time and slurry

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