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Characterization of High Sulfur Bauxite and Its Phase Transformation ...

2023.9.7  It directly reflects the transformation from pyrite to hematite in the desulfurization process. Pyrite still accounts for 96.97% of the sulfur bearing minerals.

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Proposal for management and alkalinity transformation of bauxite ...

2016.3.29  Generation of bauxite residue. The alumina extraction process requires a caustic liquor of Na and Ca hydroxides (pH >13) and produces two streams, a green

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Acid transformation of bauxite residue: Conversion of its

2017.2.15  Bauxite residue (BR) is a highly alkaline solid hazardous waste produced from bauxite processing for alumina production. Alkaline transformation appears to

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Comprehensive Application Technology of Bauxite Residue

2022.3.1  Bauxite residue is the industrial solid waste discharged from the production of alumina by bauxite, which contains a certain amount of ferric oxide in a reddish-brown

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Phase transformation processes in karst-type bauxite deposit

2017.6.30  Phase transformation processes in karst-type bauxite deposit from Yunnan area, China June 2017 Ore Geology Reviews 89 DOI: 10.1016/j.oregeorev.2017.06.026

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Metals Free Full-Text From Bauxite as a Critical Material to

2023.10.25  In general, bauxite is an ore formation consisting of a conglomerate of several minerals containing aluminum, with other valuable impurities. Iron oxides, such

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Dealkalization processes of bauxite residue: A

2021.2.5  This review focuses on several typical processes for the management of bauxite residue alkalinity in recent decades around the world. The phase transformation

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Interaction between karst terrain and bauxites:

2017.9.19  Here we characterize the orebody distribution of Quaternary bauxites and chemical process during bauxite transformation based on field observations and statistical analyses, including inverse...

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Guinée - Bauxite : le pays est-il prêt à se lancer

2022.4.15  Le Colonel Mamady Doumbouya, chef de la transition, a instruit les sociétés minières de construire des usines de raffinage pour traiter la bauxite localement. Il leur a donné jusqu'au 31 mai ...

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Characterization of High Sulfur Bauxite and Its Phase Transformation ...

2023.9.7  At present, high sulfur bauxite is gradually being used in the production of alumina industry to address the shortage of bauxite resources in China. However, sulfur-containing minerals in bauxite can cause iron pollution in the digestion system, corrode steel facilities, increase caustic consumption, and affect the quality of alumina products. From

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Industrial wastes applications for alkalinity regulation in ...

2019.2.2  Bauxite residue is a highly alkaline material generated from the production of alumina in which bauxite is dissolved in caustic soda. Approximately 4.4 billion tons of bauxite residues are either stockpiled or landfilled, creating environmental risks either from the generation of dust or migration of filtrates. High alkalinity is the critical factor

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Proposal for management and alkalinity transformation

2017.8.25  Bauxite residue (red mud) is an alkaline solid generated dur-ing the process of alumina production. The accumulative in-ventory of bauxite residue reached an estimated 0.6 billion tons with an annual growth of more than 70 million tons in China, and currently, almost all bauxite residue is stored on land (Xue et al. 2016).

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Geochemistry and Mineralization of the Permian Bauxites

2023.5.4  A succession of Permian bauxite deposits are concentrated in Wuchuan, Zheng’an and Daozhen counties of northern Guizhou, South China. These deposits overlie contrast bedrocks, which are discriminated from the other bauxites of karst type in South China. Horizons of these bauxites are typified by sandwiched constructure, the upper

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Un second projet de traitement des résidus de bauxite

2022.4.1  Après l'unité de démonstration commerciale implantée à l'Usine Vaudreuil, Rio Tinto investit dans un second projet de traitement et de valorisation des résidus de bauxite.

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Acid transformation of bauxite residue: Conversion of its

2017.2.15  Bauxite residue (BR, or red mud) is an alkaline solid waste generated during alumina extraction from bauxite using the Bayer, sintering and Bayer-sintering processes in refineries. The volume of bauxite residue generated per ton of alumina product is approximately 0.5–2 tons [3], [4], [5]. Raising demand for alumina worldwide has

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THE ALUMINIUM STORY BAUXITE TO ALUMINA: THE

2020.4.30  Plant steam energy use includes digestion 25%, evaporation 12%, clarification (residue thickening and washing) 3% and precipitation 1%. The most energy-intensive unit operation is Calcination, followed by Digestion. Needless to say there are strong drivers for reducing energy usage because of its cost.

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On the Direct Reduction Phenomena of Bauxite Ore Using H

2020.3.28  The Bayer Process is the dominant industrial method to produce alumina from bauxite ore. Due to the generation of large amounts of Bauxite Residue (red mud), an alternative method, called the Pedersen Process, is of our interest. This process makes use of a combination of pyrometallurgical and hydrometallurgical techniques in order to

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The Sandy Desilication Product Process Concept JOM

2019.6.24  The principal components of bauxite ores are aluminum-, iron-, and silicon-bearing minerals. In the Bayer process for recovery of alumina from bauxite,1 aluminum is dissolved into hot alkaline solution whilst iron is relatively insoluble. “Reactive silica” in the form of silicate minerals, such as kaolinite, typically dissolves and reprecipitates as

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Effect of Thermal Activation Temperature on Pre-desilication

2023.2.9  A single thermal activation process had a rare effect on the chemical composition and A/S ratio of low-grade bauxite, but it induced the phase transformation of low-grade bauxite. The alumina-containing mineral diaspore was converted to dialuminium trioxide, while the primary silica-containing mineral kaolinite was converted to amorphous ...

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Alkalinity stabilization behavior of bauxite residue: Ca-driving ...

2019.2.2  Alkaline anions, include CO32–, HCO3–, Al(OH)4–, OH–, continuously released from bauxite residue (BR), will cause a potential disastrous impact on surrounding environment. The composition variation of alkaline anions, alkaline phase transformation pathway, and micro-morphological transition characteristics during the gypsum addition

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A green process for zeolite synthesis: low-temperature vapor

2022.9.3  In this work, three samples of bauxite were used as inexpensive sources for the zeolite formation by a green process based on vapor-phase crystallization (VPC) method. The synthesis was carried out using a water bath with deionized water heated at 35, 45, 60 or 90 °C. During the process, NaOH pre-fused bauxites were contacted only with

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Mining and Refining – Process - International Aluminium

The process stages are: 1. Milling. The bauxite is washed and crushed, reducing the particle size and increasing the available surface area for the digestion stage. Lime and "spent liquor" (caustic soda returned from the precipitation stage) are added at the mills to make a pumpable slurry. 2.

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Research progress on desulfurization technology of high-sulfur bauxite ...

2022.10.1  Results showed that when roasting at 650 °C for 120 s, the desulfurization efficiency was up to 76.98%, while the residual sulfur in the roasted ore was found to be 0.07%. HU et al [24] roasted high-sulfur bauxite ore at 600 °C for 60 min, and the dissolution test was performed at 240 °C and roasted for 60 min.

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Enrichment and separation of iron minerals in gibbsitic bauxite residue ...

2020.7.1  For the Bauxite B and Bauxite C with A/S of 7.82 and 3.35, only hematite and zeolite (a kind of DSP) can be detected in the XRD patterns of red mud Fig. 8 XRD patterns of red mud derived from LTD (Bauxite A), HTD (Bauxite A) and RBD (Bauxite A, Bauxite B, Bauxite C) processes (LTD: 60 min, 140 °C, 170 g/L Na2OK, solution

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Al-Monohydrate (Boehmite) to Al-Trihydrate

2020.1.23  Hence, the boehmite to bayerite/gibbsite transformation observed during wet attrition milling is of relevance in the context of the Bayer process. Pre-treatment of bauxite in an attrition mill or ‘simultaneous milling and leaching’ in the mill is expected to have a beneficial effect on the alkali leaching of bauxite containing difficult to ...

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Iron Recovery from Bauxite Residue Through Reductive

2018.6.20  The scope of this work is to develop and optimize a reductive roasting process followed by wet magnetic separation for iron recovery from bauxite residue (BR). The aim of the roasting process is the transformation of the nonmagnetic iron phases found in BR (namely hematite and goethite), to magnetic ones such as magnetite, wüstite, and

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Extraction de l'alumine — Wikipédia

2024.1.24  L’extraction de l’alumine est un procédé chimique qui permet d’extraire l’oxyde d’aluminium appelé alumine contenu dans la bauxite.L’alumine est la principale matière première qui permettra la fabrication de l’aluminium métal par un procédé d'électrolyse.. La mise au point du procédé a été faite au cours de la deuxième moitié du

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Mining And Refining: From Red Dirt To Aluminum Hackaday

2021.12.13  The key to the Hall-Héroult process was the discovery of cryolite, a salt of sodium, aluminum, and fluorine. Cryolite lowers the melting point of alumina to about 900° C, making electrolysis ...

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Nanogeochemistry of karst-type bauxite from Jingxi,

2023.6.1  The West Guangxi Bauxite metallogenic belt is located in the Jingxi – Tiandong heave of the Youjiang Indochina fold belt of the Caledonian fold system in South China, surrounded by West Sichuan Central Yunnan Oldland, Ghiangnania, Yunkai Oldland, and Yuanlaoyuebei heave (Fig. 1) (Zhang, 2011).In the region, the crust underwent

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Natural evolution of alkaline characteristics in bauxite residue

2017.2.1  Basic alkalinity transformation of bauxite residue. Alkalinity as equivalent of free hydroxide, aluminate and carbonate, therein carbonate contains the concentration of carbonate and bicarbonate, all expressed in mg L −1 Na 2 CO 3. Three sub-samples are normally used to demonstrate statistical measures of dispersion, and the small sample

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Dynamic Variations of Soil-Formation Indicators in Bauxite

2022.3.16  Soil-formation process is critical to ecological rehabilitation on bauxite residue disposal areas. In this study, a soil column experiment was taken to assess the dynamic variations of soil-formation indicators in bauxite residue driven by the integration of waste solids and microorganisms. Results showed that the combination of waste solids

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Français: La production d'aluminium : de la bauxite à l'alumine

La bauxite est broyée puis mélangée à de la soude à haute température et sous pression. La liqueur obtenue, l’aluminate de sodium, est débarrassée de ses impuretés, puis diluée et refroidie, ce qui provoque la précipitation d’oxyde d’aluminium hydraté. Celui-ci est alors calciné pour obtenir l’alumine destinée à la ...

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Bauxite Propriétés, Formation, Utilisations » géologiescience

2023.4.3  La bauxite est un minéral de roche sédimentaire qui est la principale source d'aluminium. Il est formé par l'altération des roches riches en aluminium dans les régions tropicales et subtropicales. Le nom bauxite est dérivé du village français des Baux, où il a été découvert pour la première fois en 1821 par le géologue Pierre Berthier. La bauxite

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Comparison of the effects of Ti- and Si-containing minerals

2023.8.25  Goethitic bauxite is a widely used raw material in the alumina industry. It is an essential prerequisite to clarify the effect of Ti- and Si-containing minerals on goethite transformation in the Bayer digestion process, which could efficiently utilize the Fe- and Al-containing minerals present in goethitic bauxite. In this work, the interactions between

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Pre-desilication and digestion of gibbsitic bauxite with

2012.11.14  The effect of lime on the pre-desilication and digestion of gibbsitic bauxite in synthetic sodium aluminate liquor at different temperatures was investigated. The bauxite is comprised of gibbsite, aluminogoethite, hematite, kaolin, quartz, and minor boehmite. Lime increases the desilication efficiency of the bauxite during the pre-desilication

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Comparison of the effects of Ti- and Si-containing

2023.8.31  Abstract: Goethitic bauxite is a widely used raw material in the alumina industry. It is an essential prerequisite to clarify the effect of Ti- and Si-containing minerals on goethite transformation in the Bayer digestion process, which could efficiently utilize the Fe- and Al-containing min-erals present in goethitic bauxite.

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Effects of minerals in ferric bauxite on sodium carbonate

2015.7.14  Direct reduction is an emerging technology for ferric bauxite utilization. However, because of sodium volatilization, its sodium carbonate consumption is considerably higher than that in ordinary bauxite processing technology. TG-DSC and XRD were applied to detecting phase transformation and mass loss in direct reduction to

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Définition Bauxite - Futura

2023.1.6  La bauxite fait partie de la famille des roches sédimentaires. Elle se présente avec des couleurs et des structures assez diverses et variées. La bauxite peut ainsi prendre des teintes blanches ...

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