WEBBauxite residue, sometimes called red mud, or bauxite tailings, is the solid material remaining after digestion in the Bayer process and includes the compounds not dissolved by the sodium hydroxide and the compounds formed during the desiliion, autoclaving, and other stages of the process (see Chaps. 4 and 5 ).
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WEBOther articles where Bayer process is discussed: alumina: .extracted from bauxite through the Bayer process, which was developed for the aluminum industry in 1888. In the Bayer process bauxite is crushed, mixed in a solution of sodium hydroxide, and seeded with crystals to precipitate aluminum hydroxide. The hydroxide is heated in a kiln in .
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WEBDec 14, 2022 · Austria 1888: Karl Josef Bayer first discovered the Bayer process (digesting crushed bauxite in strong sodium hydroxide solution at temperature up to 240oC. ... Dressing or Concentration of the Bauxite ore by Hall's method . The dressing is the process of extracting a metal from an ore in which gangue is removed and the ore is .
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WEBDec 15, 2023 · The Bayer process, introduced by Karl Josef Bayer in 1888, is the most frequently used method. In this process, bauxite ores are digested in concentrated sodium hydroxide solution at elevated temperature of 150 °C to 230 °C.
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WEBMar 26, 2022 · Increasing the temperature, time, and zinc concentration and decreasing the bauxite particle size are beneficial to the removal of sulfur. This is a new and effective method of sulfur removal by adding zinc during the digestion process, and a reasonable process of alumina production from highsulfur bauxite is developed and described.
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WEBJan 6, 2023 · The Bayer process was studied and patented by Karl Josef Bayer and is still the most economic procedure for producing 1 ton of alumina from – t of bauxite ores (Hind et al. 1999).The process consists of three steps (Bahrami et al. 2012a; Sidrak and research 2001): Bauxite is extracted from the mine and mixed with a hot stream of .
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WEBJan 1, 2023 · The Bayer process is basically used for the extraction of aluminum hydrate from the bauxite ores with the mass ratio of alumina to silica (A/S) above nine (Tabereaux and Peterson, 2014). The sinter process is widely used to process the poorgrade diasporic bauxite ores with A/S below seven, in China and Russia, by sintering the .
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WEBApr 1, 2018 · The concentration of the bauxite present in the overburden is possible using only screening and the oversized (> mm) product contains 40% of the available alumina, with less than 4% reactive ...
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WEBFeb 5, 2021 · Fig. 2 illustrated the main process of extracting alumina from bauxite by Bayer process and the alkali sources of Bayer bauxite residue. Table 3, Table 4 summarized the main elements and mineralogical compositions of different types of bauxite, as well as the Bayer process parameters applicable to them (Ruys, 2019). It .
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WEBBayer's process is used for beneficiation of red bauxite. Serpeck's process is used for beneficiation of white bauxite. Reaction to remove impurity from white bauxite is: S i O 2 + 2 C → S i + 2 C O.
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WEBIt is one of the critical contaminants in the Bayer process. Its average concentration, in karst bauxites is usually % and in laterite bauxite % in order of magnitude . Based on the available data the highest C org content, in deposit average, was revealed at Gove with value of % (Hill et al. 1983).
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WEBBayer's Process of Concentration of Bauxite: This process is applied when bauxite contains more Fe 2 O 3 am less SiO 2. This finely ground calcined ore is digested with 45% NaOH solution in an autoclave under 80 lbs pressure at 150°C for ~ 8 hours. When Al 2 O 3 and SiO 2 go into solution as NaAlO 2 and Na 2 iO 3 respectively. The hot ...
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WEBFeb 20, 2020 · The circulation liquid and lime (75% active CaO) for Bayer leaching were obtained from Guizhou, China. Methods. Three different Al–Fe recovery processes can be found in Fig. shown in Fig. 2, the L–R–S process means that the bauxite is firstly subjected to Bayer leaching, followed by magnetic roasting of red mud, and then, the .
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WEBNov 1, 2023 · Bauxite residue (BR) is generated as a byproduct of the Bayer process. Approximately tons of BR is generated per ton of alumina production but the quantity of bauxite residue depends upon on the quality of the processed bauxite ore and the processing parameter (Primary Aluminium Production).The annual generation of BR in .
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WEBApr 3, 2023 · The obtained desilied bauxite was subjected to atmospheric leaching at 120 °C in a strong alkali solution (350 g L−1) or highpressure leaching at 160220 °C using the Bayer process mother ...
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WEBOf this the greatest concentration is in Guinea, where there are wellproven resources of approximately 25 billion tonnes. Most bauxite occurs close to the surface, with only 1 or 2 m of overburden. Typical deposits range in thickness from 3 to 15 m. ... The bauxite ore, Bayer process materials before precipitation, ...
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WEBTechnological investigations were carried out based on the Bayer process. Predesiliion characteristic of the bauxite, the effects of digestion temperature and retention time, concentration of Na 2 O and amount of CaO addition on Al 2 O 3 digestion efficiency in Bayer process, the settling characteristics of the red mud were determined. The .
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WEBThe ultimate product of calcination is the most stable phase of alumina, corundum or alumina. This is, however, not desirable for smelting, because alumina is slow to dissolve in the bath (refer to Section 24). For the formation of Smelting Grade Alumina (SGA), calcination is carried out at around 950°C.
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WEBOct 1, 2009 · Alumina production from bauxite ore (Bayer Process) is a perfect example of an operation with supersaturated solutions and of the special care that the instability of such solutions demands. ... being the variable of choice for the control of the precipitation process. R = Alumina concentration Soda concentration. Alumina indies the .
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WEBBauxite is the principal ore of aluminium. The impurities present in bauxite are SiO2, iron oxides and titanium oxide (T iO2). Concentration is carried out by heating the powdered ore with a concentrated solution of NaOH at 473 – 523 K and 35 – 36 bar pressure. This process is called digestion. Al2O3 is extracted out as sodium aluminate.
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WEBApr 11, 2016 · Alumina Extraction Problem. In the standard Bayer Process for refining bauxite to produce alumina, the dissolution of the alumina in the ore to form sodium aluminate is accomplished in autoclaves under high pressures varying from 70 to 200 pounds per square inch. However, some lateritic bauxite ores are readily soluble in .
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WEBJun 24, 2019 · The principal components of bauxite ores are aluminum, iron, and siliconbearing 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 silie minerals, such as kaolinite, typically dissolves and reprecipitates as .
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WEBFirst, the bauxite ore is mechanically crushed. Then, the crushed ore is mixed with caustic soda and processed in a grinding mill to produce a slurry (a watery suspension) containing very fine particles of ore. The slurry is pumped into a digester, a tank that functions like a pressure cooker. The slurry is heated to 230520°F (110270°C ...
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WEBFeb 1, 2015 · The Bayer process was developed by Karl Bayer in 1888 to leach gibbsitic, boehmitic, or diasporic bauxite to produce aluminum hydroxide (AuthierMartin et al., 2001). Different digestion conditions, especially temperature and caustic alkali concentration, are required to process different types of bauxite.
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