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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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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WEBThe 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 intraparticle diffusion model and the apparent activation energy of model of leaching is found to be 17. ...
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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 .
WhatsApp: +86 18203695377![[PDF] PilotPlant Investigation of the Leaching Process for the ...](/xzd39n7/270.jpg)
WEBOct 10, 2002 · A pilotplant process has been developed based on an innovative laboratoryscale method for the recovery of scandium that exists in economically interesting concentrations in red mud, the main byproduct of alumina production. This method includes acid leaching of the red mud pulp, ionexchange separation of scandium and .
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WEBJun 28, 2023 · The Bayer process is the main method of alumina production worldwide. The use of lowquality bauxites for alumina production results in the formation of a significant amount of technogenic waste—bauxite residue (BR). The Bayer reductive method is one possible way to eliminate BR stockpiling, but it requires highpressure .
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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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WEBJan 1, 2016 · PDF | On August 3, 1888 German Patent No. 43977 entitled "A Process for the Production of Aluminum Hydroxide" was issued**. ... The Bayer Process involved the pressure leaching of bauxite with ...
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WEBApr 1, 2021 · The leaching of boehmitekaolinite bauxite from the Severoonezhsk deposit mine (Arkhangelsk region, Russia) using a mixture of NH 4 HSO 4 and H 2 SO 4 was investigated for the first time. The bisulfate method, which combines the advantages of the acidic and alkaline methods, involves bauxite leaching, precipitation of ammonium alum ...
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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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WEBThis article presents the results of experimental investigations of the leaching process kinetics for different types of bauxite: gibbsite, boehmite, diaspore, and gibbsite/boehmite and ...
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WEBThe 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 CaO addition on the behavior of diaspore bauxite in NaOH submolten salt were investigated by experiment. The results show that high temperature leads to the .
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WEBJun 4, 2019 · For the first time this study showed a process combination of acid leaching and adsorption on zeolite for the recovery of Ga from bauxite residue, therefore process parameters were developed for the study in batch .
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WEBDec 12, 2016 · In this study, extraction of aluminum, iron, and titaniumbearing constituents from diasporetype bauxite ores was investigated by stepwise treatment consisting of predesiliion via alkalileaching of bauxite ore, extraction of alumina via Bayer process, and recovery of iron from red mud via magnetic separation. The pre .
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WEBMar 1, 2020 · Depressions were filled by in situ detrital material and the weathering products derived from erosional areas, generating the initial materials involved in the subsequent leaching. The quality of the bauxite generated during this process was controlled mainly by the prevailing leaching conditions.
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WEBJul 1, 2019 · During the Bayer process for alumina production, the molecular formula of the bauxite residue is approximately equivalent to Na 2 O·Al 2 O 3 · 2 ·nH 2 O. This means that 1 kg of SiO 2 in bauxite will produce 1 kg of Al 2 O 3 and kg of Na 2 O in bauxite residue. Thus, the extraction efficiency of alumina is low when processing low .
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WEBThe HallHeroult process is widely used in the extraction of aluminium. In HallHeroults process, pure Al 2 O 3 is mixed with CaF 2 or Na 3 AlF 6. This results in lowering the melting point of the mixture and increases its ability to conduct electricity. A steel vessel with a lining of carbon and graphite rods is used.
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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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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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WEBAug 1, 2014 · The optimum conditions for the process parameters were obtained as: 675 0 C calcination temperature; 97 0 C leaching temperature; mol/l acid concentration; g/ml solidtoliquid ratio ...
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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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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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WEBJul 1, 2010 · The Al2O3 recovery, as well as the kinetic parameters, during the Bayer leaching process of different bauxite types strongly depends on their mineralogical composition. In this paper an attempt was made to develop a mathematical model which enables calculation of the Al2O3 recovery from boehmitediaspore or gibbsiteboehmite .
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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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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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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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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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WEBJan 6, 2022 · Some studies have already shown that the iron oxide content in nonrefractory grade bauxite can be decreased by an acid leaching process. 5, 820 Hydrochloric acid (HCl) in particular seems to be attractive for this appliion. However, in order to determine the possible leaching success, extensive tests are necessary, since a large number of ...
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A material supplier from Belgium would like to produce limestone powder for his custome...
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