12%Wei et al. studied the scandium leaching from bauxite residue using HCl, where the efficiency achieved up to 84% using 20% of acid concentration, 80 °C for 3 h and solid–liquid ratio equals to 1/10, and the kinetic modeling reached the Avrami model . Basturkcu studied the leaching of rare-earth elements from bauxite residue.
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 ...
Bauxite residue, also known as "red mud," is a by-product of aluminum production, and in conventional approaches is typically discarded. Red mud is often dumped as waste, which has triggered environmental concerns in recent years. ... Addition of water to the obtained residue results in leaching the converted oxides into a leach liquor ...
Metallurgical Process For Selective Leaching And Extraction Of Scandium And Sodium From Iron Rich Bauxite Residue: Posted on: Degree:Doctor Type:Dissertation Country:China Candidate:Z B Liu Full Text:PDF GTID:66043 Subject:Metallurgical engineering Abstract/Summary:
Bauxite residue (red mud), which is an industrial byproduct, contains valuable trace elements. Solid NH4Cl was used as a chlorinating agent during the microwave heating of red mud to convert trace elements into soluble metal chloride. Red mud was heated using microwave ovens under various conditions (i.e., with the addition of solid NH4Cl and with a range of microwave output powers and ...
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 iron was high as well (∼60%). The maximum extraction of the REEs ...
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
Acid leaching 1 t bauxite reaction residue can produce 12.09 t liquid PAC (Al 2 O 3: 10 %, basicity: 88.6 %). Other raw materials required are shown in Table.S6, in the supplementary materials. Raw material cost is 389.47 RMB for producing 1 t liquid PAC, which is far lower than the market price of PAC of 600 RMB t −1. Therefore, on economic ...
The effect of neutralisation of bauxite residue with CO 2 gas on the recovery of selected REEs from bauxite residue was investigated in two consecutive processes according to the diagram in Fig. 1: (1) neutralisation of bauxite residue slurry with CO 2 gas, and (2) acid leaching of the neutralised bauxite residue with H 2 SO 4. The changes in ...
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.);
Bauxite residue (BR, also called red mud) represents an interesting source for major elements such as aluminium, iron and titanium, but also for rare-earth elements (REEs). 1 Several methods based on direct acid leaching have been
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 ...
Dilute H 2 SO 4 is the most efficient leachant for leaching of scandium from Australian bauxite residue (Wang et al., 2013), in contrast to leaching of scandium from Greek bauxite residue. This difference in leaching behaviour was attributed to the differences in mineralogical composition of these two types of bauxite residue ( Wang et al., 2013 ).
Leaching of copper and nickel in soil-water systems contaminated by bauxite residue (red mud) from Ajka, Hungary: the importance of soil organic matter Cindy L. Lockwood, 1, 6 Douglas I. Stewart, 2 Robert J. G. Mortimer, 1, 7 William M. Mayes, 3 Adam P. Jarvis, …
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 ...
Radium (Ra) removal by an unconventional sorbent, a modified bauxite refinery residue (MBRR), is investigated for a groundwater extracted in Missouri, USA. The MBRR treatment causes substantial reductions of both gross α and combined Ra activities from …
1 Type of the Paper: Article, Conference Paper 2 This paper is the written and extended version of the oral presentation entitled as "Design Aspects of a Selective 3 Leaching Process for Scandium Recovery from Bauxite Residue", in the ERES 2017 Conference (European 4 Rare Earth Resources 2017), which was held in Santorin i, Greece, 28-31 May 2017.
A Mineralogical Assessment on Residues after Acidic Leaching of Bauxite Residue (Red Mud) for Titanium Recovery. Metals 7, 458 (2017). Article Google Scholar 35. Habashi, F. A textbook ...
leaching process and consequently increase plants biomass and nutrient uptake. 2. Materials and Methods . 2.1. Bauxite-processing residue sand and biochars physicochemical properties . The unweathered and untreated (fresh) BRS was collected from Alcoa of Australia (Alcoa) Kwinana Residue Storage Area (32° 11' S, 115° 49' E), Western Australia.
J. Sustain. Metall. 2, 28– 37 4 Recovery of rare earths from bauxite residue slag by high-pressure acid leaching BR 2018 Conference - Rodolfo Marin Rivera Bauxite residue 98 ± 1. 7 66 ± 1. 6 144 ± 3. 0 65 ± 2. 6 Slag 124 ± 1. 6 106 ± 1. 3 169 ± 1. 5 112 ± 0. 7
Bauxite residue (BR, also known as "red mud" in the slurry state) is a waste product generated during the Bayer process of alumina production from bauxite.1–4 About 140 million tonnes of BR are generated annually and almost 4×109 tonnes are already stockpiled. Long-termstorage of such
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 ...
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 ...
The process consists of the following steps: calcination of bauxite, leaching of calcined bauxite in hydrochloric acid, filtration of residue, crystallization of A1C1 3.6 H 2 O, decomposition of AlCl 3.6 H 2 O crystals to produce A1 2 O 3, regeneration of hydrochloric acid for recycle into the leaching step.
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).
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.
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 …
Compared to bauxite residue produced today, the leach residue offers a major advantage since all sodium is dissolved into the leach solution and hence the final sodium content is very low. Since this is a pre-requisite for clinker production, the new leach residue could be introduced at higher levels in the raw meal formulations, than the ...
A process for recovery of soda from Bayer process bauxite residue comprises the steps: (a) leaching bauxite residue with sulphuric acid to dissolve soda in DSP in bauxite residue therein; (b) neutralizing the slurry of step (a) with caustic materials to precipitate partially dissolved silica, alumina and calcium, and separating the insoluble portion with precipitated materials by filtration to ...
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.