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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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.
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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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WEBJul 15, 2019 · In this study, an alternative twostage extraction process to acid roastingwater leaching was investigated to recover scandium from a Canadian bauxite residue. The process is called acid bakingwater leaching, in which bauxite residue is mixed with 98 wt% H 2 SO 4, baked in a furnace at 200–400 °C, and leached in water at ambient .
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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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WEBMay 10, 2019 · Water leaching process is also recommended as a promising strategy to ameliorate the high salinity and alkalinity of bauxiteprocessing residue (Zhang et al., 2011) and high sodium (Na +) concentration has been reported in bauxiteprocessing residue leachate (Xiangfeng Kong et al., 2018a). Taking full advantage of the available water .
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WEBOct 7, 2015 · Abstract. During direct acid leaching of bauxite residue, high amounts of iron also dissolve at high REEs recovery. In this paper, a sulphationroastingleaching process was developed to ...
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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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WEBAug 11, 2016 · Therefore, the leaching process with dilute HNO 3 has been performed and optimized at a pilot scale for the recovery of scandium from bauxite residue . According to Petrakova et al., leaching with nitric acid could be a problem due to the absorption of nitrate ions on the residue, so that large volumes of water are needed for their removal [ .
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WEBJul 28, 2019 · The novel Sandy DSP SinterLeach process provides a lower energy intensity method for the recovery of sodium and aluminium lost to bauxite residue. The present study is an investigation into the ...
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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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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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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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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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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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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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WEBJun 1, 2015 · At this preliminary study, HbetTf 2N was applied on the direct leaching of Bauxite residue (Red. Mud), the solid residue generated from the Bayer process in alumina refineries worldwide. Bauxite ...
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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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WEBDec 1, 2010 · This 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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WEBBauxite 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 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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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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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 21, 2016 · Acid leaching. In order to recover scandium and other rare earth metals, red mud is often dissolved by leaching with acids. The investigations on acid leaching of scandium from bauxite residue were extensively carried out [51, 53, 78, 89–93].Zhang et al. [] used HCl for leaching of scandium from red mud, and the optimum leaching .
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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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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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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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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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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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WEBDec 27, 2021 · The carbonate leaching of scandium from the landfilled bauxite residue (red mud) of the Bogoslovsky Aluminum Plant (Russia) and samples of red mud (RM) after alkaline pretreatment has been ...
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