WEBOct 1, 2016 · The orthogonal experiment of highsulfur bauxite leaching process. Table 4 lists the schedule of the orthogonal test in which the three factors liquid–solid ratio (A), leaching temperature (B) and leaching time (C) are selected. Each factor has three levels to be optimized.
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WEBApr 4, 2017 · A full process was designed to recover scandium from bauxite residue. • Scandium is leached by sulfationroastingleaching and multistage leaching. • [Hbet][Tf 2 N] was used for the extraction of scandium from the leachate. • Separation between Fe and Sc was improved by reduction of Fe(III) to Fe(II).
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WEBThe leaching order of these materials are as follows: Goethite > serpentine > magnetite and hematite. The leaching kinetics were analyzed and this leaching process followed a shrinking core model controlled by a combination of .
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WEBJun 1, 2018 · 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 factorsorthogonal experiments and .
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WEBApr 1, 2021 · Therefore, the leaching process of aluminum in this paper is diffusion control. This is consistent with the fitting results of the diffusion control model. ... Acid leaching 1 t bauxite reaction residue can produce t liquid PAC (Al 2 O 3: 10 %, basicity: %). Other raw materials required are shown in, in the .
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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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WEBJan 1, 2010 · The proposed ANN method could be applied as a new method for the prediction of leaching recovery in the Bayer process, when the bauxite from different sources and with different chemical ...
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WEBOct 1, 2007 · The behavior of Al and Si in red mud in the leaching process of diaspore bauxite with NaOH submolten salt was investigated. The effects of reaction temperature, mass ratio of alkali to ore and ...
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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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WEBThe results indied that leaching of bauxite is the rate controlling process. The activation energy was determined to be kJ/mole, which was characteristic for a chemically controlled process. In this paper the results of a leaching kinetics study of bauxite ore with sodium hydroxide are presented. The effect of ore particle size, sodium ...
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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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WEBJan 6, 2022 · In order to clarify these open questions, leaching tests on bauxite were planned and evaluated in this study using the computerized statistical design of experiments method. ... With an acid leaching process using hydrochloric acid, ironrich bauxite can be beneficiated to achieve an Fe 2 O 3 content < 2 %, ...
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WEB3 days ago · Hint: Baeyer's process is a process used for the leaching of bauxite ( an ore of aluminium ). The reagent chosen should be the one which is a strong reducing agent. Complete answer: Leaching is a process which consists of treating the powdered ore with a suitable reagent such as acid base or other chemicals which can selectively dissolve .
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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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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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WEBJul 20, 2021 · Lithium is one of the secondary mineral elements occurring in bauxite. The behavior of lithiumbearing bauxite in the digestion process was investigated, and the effect of digestion conditions on the extraction rates of lithium was studied. The results demonstrate that the mass ratio of the added CaO to bauxite, the KOH concentration, .
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WEBNov 1, 2020 · The acid baking water leaching process proves to be a promising technique as the first step of a potential nearzerowaste integrated process for the sustainable valorization of bauxite residue to ...
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WEBAug 4, 2020 · leaching process and a formula different than Equation (5) would be obtained (Levenspiel 1999). Figure 2: Leaching in a highly porous particle. of constant size. 4 F. Faraji et al.: Kinetics of ...
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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 24, 2024 · The following are the examples of leaching process. Leaching of Bauxite. An example of a leaching process is the leaching of bauxite or Al 2 O 2 O with concentrated and heated sodium hydroxide. The concentrated NaOH here prefers to dissolve the aluminium contained in the provided bauxite, ...
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WEBJun 1, 2024 · Bauxite residue (BR) is a byproduct of bauxite refining using Bayer process for alumina production, which contains numerous valuable components: iron (Fe), aluminum (Al), and rare earth elements such as scandium (Sc). The main issue of previous research for the Sc extraction from BR was the low extraction efficiency or high Fe coextraction.
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WEBFeb 2, 2024 · This paper introduces the trend of gallium in the smelting process of bauxite, summarizing a comprehensive overview of the latest trends in the extraction method of gallium from the bauxite process such as ion exchange method, extraction method, fractional precipitation method, and electrolysis, comparing the advantages and .
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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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WEBMay 30, 2022 · Bauxite Ore Processing: The bauxite is purified by the Bayer Process. First the ore is mixed with a hot concentrated solution of sodium hydroxide. The NaOH will dissolve the oxides of aluminum and silicon but not other impurities such as iron oxides, which remains insoluble. Impurities are removed from bauxite by leaching a bauxite .
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WEBJan 1, 2024 · Currently, there are few experiments on leaching Li from bauxiteassociated type Li resource, and the Li leaching process is in the stage of continuous optimization. The leaching efficiency of Li is affected by many factors (, calcination temperature, leaching temperature, leaching time, liquid–solid ratio and particle size).
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WEBJan 1, 2023 · The leaching of highsilica bauxite using a mixture of NH 4 HSO 4 and H 2 SO 4 was analyzed using empirical SCM equations ((7), (8), (9)) to determine the optimal process by estimating the coefficient of determination (R 2). The following kinetic equation is applicable if the leaching process is limited by the surface reaction: (7) 1 – 1 ...
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WEBJun 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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WEBNov 4, 2022 · The Bayer process, the production of pure aluminium oxide hydrate (or more chemically formulated aluminium hydroxide) from bauxite, and the calcination process, the production of pure aluminium oxide from the aluminium oxide hydrate. However, these two processes are often combined in books and the media and referred .
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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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WEBNov 18, 2016 · Bauxite residue (red mud) with a high alumina content requires large amounts of fluxes during smelting, which increases the overall process cost, the energy consumption during smelting, and the acid consumption during slag leaching and decreases the throughput of bauxite residue in the smelting phase. Therefore, alumina .
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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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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 13, 2014 · Request PDF | Leaching of rare earths from bauxite residue (red mud) | Bauxite residue or red mud is a waste generated during the Bayer process of alumina production. Its storage is a spatial and ...
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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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