WEBJan 18, 2022 · The obtained desilied bauxite was subjected to atmospheric leaching at 120 °C in a strong alkali solution (350 g L1) or highpressure leaching at 160220 °C using the Bayer process mother ...
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WEBBauxite is the main source of the rare metal gallium. During the processing of bauxite to alumina in the Bayer process, gallium accumulates in the sodium hydroxide liquor. From this it can be extracted by a variety of methods. The most recent is .
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WEBDec 20, 2023 · The present paper focuses on the recovery of V from a residue of the Bayer liquor process, which is the NaOHbased hydrometallurgical extraction and refinement process of alumina from bauxite. 34 In the Bayer process, V is dissolved during the leaching step and then removed from loaded leachate as vanadium cake in the .
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WEBApr 1, 2020 · The direct use of highsulfur bauxite in the Bayer process would cause some harmful effects, such as the corrosion of the equipment, the increase in the consumption of alkali, the decline in the ...
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WEBThe Bayer process is not easily explained in brief. This method of obtaining alumina from bauxite ore is complex and involves a lengthy succession of chemical reactions, with the process varying slightly depending on the makeup of the unique source of bauxite ore. Crushed and washed bauxite ore must first go through a process to remove any ...
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WEBFeb 3, 2024 · The raw material used to produce alumina is bauxite, a mixture of iron, silicon and titanium oxides, and aluminum hydroxide. It can also be considered a source of other metals, such as scandium, vanadium, and gallium [].The Bayer process leaches bauxite with sodium hydroxide and produces alumina [].The bauxite is crushed and sent to .
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WEBJan 28, 2020 · The Bayer process used in the refining of alumina from bauxite ore generates a solid, highly alkaline salinesodic byproduct, referred as bauxite residue (BR), with a global estimated annual production of 150 million tons (Mt) and a total global inventory estimated at billion tons to date [].The BR is currently disposed of in large .
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WEBThe main method of treating bauxite is the Bayer process which consists of a reaction of soda with bauxite in a reactor, most often under pressure, called an attack reactor [1]. Under these conditions, the natural amphoteric alumina hydrates are dissolved in the form of aluminate. The effectiveness of this method is affected by the type of ...
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WEBApr 26, 2015 · The Bayer process is the principal industrial means of refining gibbsite bauxite. Globally, more than 90 % of alumina is produced by the Bayer process (Hausberg et al. 2000). Compared with either the sintering or combined process, the Bayer process is less complex, giving rise to a higher quality product (Liu et al. 2009). Typically, to .
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WEBNov 14, 2023 · The Bayer process is the principal industrial means of refining bauxite to produce alumina (aluminium oxide). Bauxite, the most important ore of aluminium, contains only 30–54% aluminium oxide, (alumina), Al 2 O 3, the rest being a mixture of silica, various iron oxides, and titanium aluminium oxide must be purified before it can be .
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WEBMar 30, 2023 · The Bayer process for alumina production generates more than 160 million tons of bauxite residue annually. The current global stockpiles of bauxite residue have reached more than 4 billion tons with less than 2% annual recycling rate. Critical elements such as Sc and Y present an opportunity to explore bauxite residue as a secondary .
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WEBDec 1, 2010 · The major process for the input of organics to the Bayer process is the initial extraction of organics from the bauxite (Solymár et al., 1996). Extraction of organics begins as soon as the bauxite is contacted with caustic soda during milling, and continues during any other treatments before digestion, such as predesiliion.
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WEBAug 22, 2023 · The Bayer process is used worldwide for the alumina production. This process involves the alkaline leaching of bauxite to extract Al, followed by the precipitation of Al(OH) 3 to recycle the solution [1,2,3].The leaching process results in the formation of a solid residue, commonly referred to as a bauxite residue, which consists of iron .
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WEBDec 8, 2009 · As a result, most of Bayer process bauxite residue is pumped to disposal site in the alumina plant II of the Shandong Alumina Co. There is about 15–25% Al 2 O 3 and 5–12% Na 2 O remaining in common red mud generated from the Bayer process. Liu et al. (1997) did some work on recovery of aluminum and sodium. Firstly, they mixed .
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WEBNov 5, 2018 · The production process of Bayer alumina is shown in Figure 2. In the Bayer process, bauxite is leached with a hot solution of sodium hydroxide (NaOH) at temperature of 150–240°C and at 1–6 atm pressure . The aluminum minerals in the bauxite may be present as gibbsite (Al(OH) 3), boehmite (AlOOH) or diaspore (AlOOH) . The different .
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WEBBayer's Process. Here aluminium is treated with concentrated sodium hydroxide solution to form soluble sodium aluminate which can be filtered off. The filtrate is heated with water to get aluminium hydroxide which on strong heating gives alumina. HallHeroult Process. The HallHeroult process is widely used in the extraction of aluminium.
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WEBAug 14, 2015 · Wellreacted geopolymers with good compressive strengths (44–58 MPa) were formed from highly alkaline residue from red mud (the residue remaining after extraction of alumina from bauxite by the Bayer Process) without the addition of strengthpromoting components, such as fly ash or ground slag, by adjusting the composition to .
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WEBJan 22, 2022 · The Bayer process is a chemical process for refining aluminium hydroxide, Al(OH) 3 from bauxite; this aluminium hydroxide is subsequently calcined to produce alumina, Al 2 O 3 . The basis of the ...
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WEBMay 21, 2024 · The Bayer process is an industrial process by which bauxite is purified into alumina, or aluminum oxide. Named for Karl Bayer, who developed it in the late 19 th century, this process is an essential intermediate step in the production of aluminum metal. Alumina is produced through a series of controlled chemical reactions from bauxite, a .
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WEBMay 6, 2023 · Bauxite residue (BR) is a byproduct from the aluminum industry, generated during the Bayer process to obtain alumina. It has valuable iron and alumina contents, with soluble ions that can interact with the cement compounds, which could make BR a new source of supplementary cementitious material. This work aims to determine the .
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WEBJul 13, 2005 · The Bayer process, as it has become known, is used for refining bauxite to smelting grade alumina (aluminum oxide), the precursor to aluminium. Typically, depending upon the quality of the ore, between and tonnes of bauxite is required to produce 1 tonne of alumina. The Bayer process is a cyclic one and is often called Bayer cycle.
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