WEBMay 15, 2015 · The leaching process with dilute HNO 3 was performed at pilot scale and optimized for the extraction of scandium from bauxite residue (OchsenkühnPetropoulou et al., 2002). Xue et al. (2010) found that at a reaction temperature of 90 °C and an L/S ratio of 3:1, over 80% of the scandium in bauxite residue could be leached by H 2 SO 4 .
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WEBSep 1, 2016 · Stripping process can be performed with any acidic solution, therefore this process can be easily adapted to any technology that is currently available for REE purifiion. The metal concentration of the pregnant ionic liquid solution (PLS), obtained after leaching bauxite residue can be seen in Table 3.
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WEBSep 1, 2022 · Based on the above results of twostage leaching process, the optimal roasting temperature and duration for the SiO 2 and Al 2 O 3 extraction from highsilicon bauxite are 1050 °C and 30 min, and the corresponding extraction efficiencies of SiO 2 and Al 2 O 3 are % and %, respectively.
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WEBApr 1, 2024 · Due to drawbacks of the direct leaching route from bauxite residue, such as silica gel formation and low selectivity towards these valuable metals, a novel leaching process based on oxidative ...
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WEBJun 24, 2019 · The sandy DSP process has the potential to significantly reduce costs associated with the bauxite residue sinterleach process by lowering energy and reagent requirements. The sandy DSP process uses conventional processing equipment and solution chemistry, which is fully compatible with the Bayer process. ...
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WEBJan 7, 2022 · Bauxite residue, known as "red mud," is a potential raw material for extracting rareearth elements (REEs). The main REEs (Sc, Y, La, Ce, Nd, Nb, and Sm) from the raw bauxite are concentrated in RM after the Bayer leaching process. The earlier worldwide studies were focused on the scandium (Sc) extraction from RM by concentrated acids to .
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WEBJun 1, 2019 · The ideal conditions for the leaching process was determined through response surface methodology (RSM) to be H3PO4 concentration of mol/L, L/S ratio of 11 mL/g and leaching temperature of 40 ...
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WEBJan 1, 2022 · The process combines carbothermic smelting, acid baking – water leaching, and thermal desulfation to efficiently extract the target materials from the bauxite residue without producing hazardous solid residues, while enabling the recovery and recycling of the major process reagents: CaO, SiO 2, and H 2 SO 4. Through .
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WEBFeb 3, 2024 · This study aims to obtain highpurity alumina from lateritic bauxite through hydrometallurgical processes by leaching bauxites with both sulphuric and hydrochloric acids at varying concentrations, temperatures, solid/liquid ratios, and process times.
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WEBJun 1, 2020 · During water leaching, the watersoluble ions in bauxite residue were leached out. The CO 3 2−, HCO 3 −, Al(OH) 4 − and OH − were selected as the typical anions to evaluate leaching behavior of alkaline solid phases in bauxite residue. With the increase of L/S ratio, the leaching concentrations of CO 3 2−, HCO 3 − and Al(OH) 4 − .
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WEBNov 27, 2023 · Bauxite residue (BR), an alkaline industrial waste, is a major byproduct of the alumina production process known as the Bayer process. The Bayer process generates a byproduct known as bauxite residue (red mud). This residue was leached with sulfuric acid in a pilot plant of Mytilineos to recover scandium. Scandium was .
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WEBJan 7, 2022 · 1. Introduction. Red mud (RM) is a solid waste generated by alkali (NaOH) leaching of bauxite by the Bayer process for alumina production [].More than one ton of RM is produced for one ton of alumina (Al 2 O 3), and over 150 Mt of RM is annually stored in landfills and sea [].The RM utilization degree is extremely low due to the high Na, Al, .
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WEBMar 1, 2019 · Although conventional acid leaching with different mineral acids (, HCl, H 2 SO 4, HNO 3) can partially or fully extract REEs from bauxite residue, the leaching process is controlled by intraparticle diffusion as metals are transported from the solid phase to the solution through the cracks and pores present in the particles (Liu et al ...
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WEBFeb 3, 2024 · This study presents a process for the simultaneous recoveryRecovery of metals from bauxite residueBauxite residue (BR) at relatively lower temperatures using H2 reduction to achieve zerowaste discharge (minimal waste generation) of BR. The proposed methodMethod...
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WEBMar 1, 2019 · During acid leaching of bauxite residue (red mud), the increase in dissolution of rareearth elements (REEs) is associated with a substantial codissolution of iron; this poses problems in the downstream processing ( solvent extraction or ion exchange). Six different slags generated by reductive smelting of the same bauxite .
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WEB1. Introduction. Depending on the composition and properties of the feedstock, alumina (Al 2 O 3) is produced by a variety of industrial processes [].Lowsilica bauxites are used worldwide for the production of alumina by the most energyeffective Bayer process, which is based on alkaline leaching with continuous regeneration of the solution by the .
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WEBJun 1, 2016 · Leaching efficiency depends on the bauxite residue composition and process parameters, such as reagent type and concentration, retention time, temperature, and solid/liquid ratio [2,3,5,6,9,10]. ...
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WEBJul 15, 2019 · The current study put the emphasis on developing a novel and environmentally friendly waste valorization process, called "acidbaking waterleaching", to recover scandium from bauxite residue produced by the aluminum industry. In this process, bauxite residue is mixed with concentrated sulfuric acid, baked in a furnace at .
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WEBDec 1, 2012 · Both clinkers sintered by the real bauxite and simulated bauxite at 1350 °C when the molar ratio of CaO to Al2O3 decreased to were produced, the alumina leaching rates of which reached over ...
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WEBFeb 1, 2020 · Bauxite residue, a byproduct of alumina manufacture, is a serious environmental pollutant due to its high leaching contents of metals and caustic compounds.
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WEBOct 15, 2023 · Bauxite resources in China are considerably large (Ling et al., 2015, Sun et al., 2018), while they are discovered mainly within Carboniferous and Permian strata of South China and North China cratons (Yu et al., 2019). ... Geochemistry characteristics and leaching process of the typical weathering profile within a karsitc depression revealed ...
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WEBThe Bayer process is the most commonly used refinement route, though certain countries use alternatives called the combined or parallel BayerSinter process and the Nephelinebased process [20, 37].This section describes purely the Bayer Process. Due to the impurities in the bauxite ore, it requires treatment to produce purer alumina, Al 2 O 3 .
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WEBJan 1, 2023 · The extracted Al in these studies exceeded 80%. However, the kinetics of the leaching process and the behavior of the major and trace elements have not been examined. Therefore, the leaching of highsilica bauxite from the Severoonezhsk deposit (μ Si < 3) using a mixture of NH 4 HSO 4 and H 2 SO 4 was investigated for the first .
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WEBAccording to the literature, the leaching process depends on the type of bauxite residue, because mineralogical composition and morphological distribution of bauxite residue determine the best leaching agent. Hence, the REE recovery process from bauxite residue must be tailored for a given source 5. Most of the previous studies were focused .
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WEBOct 15, 2023 · The REE patterns of Alrich layers were also associated with weathering and leaching process, the loss of most LREEs within bauxite ores (Fig. 9 A) and the strong negative correlation between (La/Yb)N ratios Al 2 O 3 contents (Fig. 8 H) indied REEs were also affected accompanying the accumulation of Al during the chemical weathing .
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WEBMar 21, 2023 · The bauxite residue leaching process to extract REEs can also be performed using alkaline reagents . Yatsenko and Pyagai conducted a leaching experiment of bauxite residue in an alkaline solution using NaHCO 3 as a leaching reagent to extract scandium. Scandium leaching occurs by forming complex anionic compounds with .
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WEBOct 10, 2002 · Published chemical analysis and leaching studies of bauxite residue focus on the concentration of Sc, because Sc represents 95% of REE's financial values found in BR (case of Greek Bauxite ...
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WEBFeb 5, 2021 · Generally, 1–2 tons of bauxite residue generated while producing 1 ton of alumina mainly depending on the bauxite quality and production process (Zhao et al., 2009; Jones et al., 2012; Deihimi et al., 2018; Borra et al., 2015).According to the statistics of the International Aluminium Institute (Aluminium, 2019), Fig. 1 illustrated the world .
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WEBOct 1, 2016 · Semantic Scholar extracted view of "Study on the roasting and leaching behavior of highsulfur bauxite using ammonium bisulfate" by Z. Lou et al. Skip to search form Skip to ... In this study, we propose a novel temperatureprogrammed ammonium chloride (NH4Cl) roasting–waterleaching process to extract nickel (Ni), cobalt (Co), .
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