bauxite residue leaching

Variation on leaching behavior of caustic compounds in ...

01-06-2020· After the bauxite residue and sodium aluminate solution separated, leaching behavior of alkaline anions in bauxite residue should be taken into consideration in both filter pressing and stacking process. In the washing process, washing time, L/S ratio and washing temperature are important parameters to determine the washing efficiency.

Occurrence of rare earths in post-processed bauxite residue

25-03-2019· Effect of Bauxite Residue's Alkalinity on REEs Recovery by Acid Leaching. The alkalinity of bauxite residue represents an important factor for metal recovery by acid leaching as it may lead to a large acid consumption and makes the recovery of metals economically impractical.

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 ...

Leaching Behavior of Lithium from Bauxite Residue Using ...

10-01-2020· Leaching Experiment Process. Raw bauxite residue of HN was dried at 80 °C for 24 h and then ground and sieved through a 100-mesh sifter for subsequent neutralization process. Acid Neutralization Procedure. Hydrochloric acid and oxalic acid were used for HN red mud neutralization treatment, respectively.

BR06 - Investigating the Leaching, Desilication and ...

BR06 - Investigating the Leaching, Desilication and Precipitation of Aluminium Tri-Hydroxides from a Bauxite Residue-Bauxite By-Product Slag James M. Mwase1 and Jafar Safarian2 . 1. Postdoctoral Researcher. 2. Associate Professor. Institute of Materials Science and Technology, Norwegian University of Science and Technology, Trondheim, Norway

LEACHING ASSESSMENT METHODOLOGIES FOR DISPOSAL AND …

Alumina Technology Roadmap - Bauxite Residue Research Project 4.3: Evaluation of a risk-based by-product assessment methodology Carried out under contract with the International Aluminium Institute LEACHING ASSESSMENT METHODOLOGIES FOR DISPOSAL AND USE OF BAUXITE RESIDUES

Leaching of rare earths from bauxite residue (red mud) - CORE

Leaching of rare earths from bauxite residue (red mud). Accepted for publication in Minerals Engineering. 3 (Bárdossy, 1982). The REEs report in the Bayer process to bauxite residue. The enrichment factor of the REEs in bauxite residue compared to bauxite is about two (Ochsenkühn-Petropulu et al., 1994).

Increased leaching and addition of amendments improve the ...

Increased leaching and addition of amendments improve the properties of seawater-neutralized bauxite residue as a growth medium. Li Y(1), Haynes RJ(1), Chandrawana I(2), Zhou YF(3). Author information: (1)School of Agriculture and Food Sciences/CRC CARE, The University of …

LEACHING ASSESSMENT METHODOLOGIES FOR DISPOSAL AND …

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.

Top PDF Effects of Leaching on the Chemical and Physical ...

Abstract—Bauxite processing residues (mud and sand) originating from a major source of bauxite being mined and processed for alumina production in Australia were collected and characterized. Mixtures consisting of 0:100, 25:75, 50:50, 75:25 and 100:0% v/v residue mud: residue sand were incubated for four weeks and a portion was then leached bi-weekly for another 14 weeks.

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

Leaching experiments on Greek bauxite residue were performed with different acids at different concentrations, liquid-to-solid ratios, leaching times and temperatures. Extraction of the REEs was...

Ionometallurgical Leaching Process of Bauxite Residue: a ...

Bauxite residue (BR) is the major by-product of the alkali leaching of bauxite, through the Bayer process, for alumina production; for each tonne of alumina, 1 – 1.5 tonnes of BR is generated [1].

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

A Mineralogical Assessment on Residues after Acidic ...

metals Article A Mineralogical Assessment on Residues after Acidic Leaching of Bauxite Residue (Red Mud) for Titanium Recovery Gözde Alkan 1,*, Claudia Schier 1, Lars Gronen 2, Srecko Stopic 1 and Bernd Friedrich 1 1 IME-Process Metallurgy and Metal Recycling, RWTH Aachen University, Intzestraße 3, 52056 Aachen, Germany; [email protected] (C.S.); [email protected] (S.S.);

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 …

RECOVERY OF SODA FROM BAUXITE RESIDUE BY ACID LEACHING …

Caustic soda consumption is a significant production cost when high silica bauxite is processed in an alumina refinery. 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) purification of the leached liquor and (3 ...

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

15-05-2015· Leaching experiments on Greek bauxite residue were performed with different acids at different concentrations, liquid-to-solid ratios, leaching times and temperatures. Extraction of the REEs was high for leaching in HCl solutions compared to other acids, but the dissolution of …

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

26-05-2021· Although conventional acidic leaching of bauxite residue allows a high extraction of rare-earths elements, the concentration of these elements in the leach liquor (5–9 ppm) is still about one hundred times lower than the iron concentration (about 900 ppm), which limits the extraction of rare-earths elements in further processing, for instance in the solvent extraction step or ion exchange.

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

Bauxite residue Leaching Rare earths Red mud Roasting Sulfation abstract Bauxite residue (red mud) that is generated from karst bauxite ores is rich in rare-earth elements (REEs). The REEs can be recovered from bauxite residue by direct acid leaching but the extraction yields are gen-erally low.

ECOTOXICITY OF RESIDUES FROM THE LEACHING PROCESS OF ...

ECOTOXICITY OF RESIDUES FROM THE LEACHING PROCESS OF BAUXITE RESIDUE FOR SCANDIUM PRODUCTION Viktória FEIGL1, Emese VASZITA1, Mónika MOLNÁR1, Sebastian HEDWIG2, Markus LENZ2, Ildikó FEKETE-KERTÉSZ1 1Department of Applied Biotechnology and Food Science, Faculty of Chemical Technology

ARTICLE: Addressing the Challenge of Bauxite Residue ...

11-03-2019· 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.

(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.

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.

Leaching Behavior of Lithium from Bauxite Residue Using ...

10-01-2020· 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 ...

Bauxite Residue Management - World Aluminium

VII. Utilisation of Bauxite Residue 19 - 24 a. Potential applications 19 - 23 b. Commercial applications with significant potential 24 VIII. Remediation and Rehabilitation 25 - 28 a. Case study: From red to green in ten years 26 - 27 IX. Recent Studies on Bauxite Residues 29 a. Leaching assessment methodologies 29