WEBOct 1, 2007 · The leaching kinetic results of bauxite under the conditions of low temperature and low alkali concentration showed that the leaching process was controlled by internal diffusion, and the ...
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WEBApr 17, 2023 · Experimental Method. In this study, the recovery of precious metals from bauxite ore was examined by a twostage leaching process. The stages of this process were Stage I: Removing iron to a large extent and revealing the solubility conditions of titanium by treating the bauxite ore with oxalic acid, Stage II: Determining the recovery .
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WEBJul 15, 2008 · The experimental results indie that the dissolution rate of bauxite ore increases with increasing the acid concentration and liquid solid ratio depending on the dissolution conditions as shown in Fig. 3, Fig. 4 respectively. Fig. 3 shows that the concentration has a significant effect on the rate of dissolution of the bauxite ore. In the ...
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WEB5 days ago · The extraction of Aluminium from its ore involves the following steps –. Dressing or Concentration of the Bauxite ore by Hall's method. Electrolysis by Hall – Heroult Method. Dressing or concentration of the Bauxite ore– Bauxite is generally found as an impure form of Aluminium oxide. The process which gives the ore such a physical .
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WEBOct 30, 2020 · The process of the commercial purity scandium oxide extraction from evaporated sulphuricacid solutions with concentration of scandium of more than 26 mg/l was investigated.
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WEBSep 14, 2021 · After the Bayer Process for alumina production, the scandium is trapped by the bauxite residue (also called red mud) and sent to dams. Scandium concentration may vary from 134 mg/kg (Greece) and 121 mg/kg (Jamaica) to 43 mg/kg (Brazil) [9,10,11]. Russian bauxite residue contains more than 300 mg/kg of scandium [12, 13].
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WEBMay 19, 2020 · A brief insight into the conventional Bayer bauxite digestion process demonstrates that during the low temperature digestion, gibbsite and clay minerals of bauxite gets dissolved, with formation of sodalite as one of the end reaction product. ... Further, the maximum permissible concentration of species given by USEPA guidelines ...
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WEBJun 12, 2013 · new design in order to increase the water and thermal energy recovery in the digestion process unit. The simulation results showed that in the new design, the pre heater sections can gain ...
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WEBAug 1, 2020 · Red mud or bauxite residue is a highly alkaline toxic byproduct that is generated during the production of aluminum by Bayer's process. Around tons of bauxite residues are produced for ...
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WEBJan 28, 2020 · In the process of hotdissolving bauxite in highpressure water, Fe 3+ can be reduced to Fe 2+, and then magnetite is formed to realize magnetization transformation of iron containing substances in bauxite. Using pHpotential map is an important method for analyzing the thermodynamic feasibility of the redox reaction in a solution.
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WEBMar 1, 2020 · These materials are extracted from bauxite ore through the highlighted digestion step in the process shown in Fig. 1. Bauxite is made up of multiple minerals, which vary in concentration based on the region the ore came from. ... Aluminum concentration in the bauxite ore was determined using inductively coupled plasma .
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WEBThe process of concentration of bauxite is done by Bayer's process. 2. The positively−charged aluminium ions (Al 3+) are attracted to the hode (negative electrode). They accept electrons from the hode and get reduced to form aluminium atoms (or aluminium metal).
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WEBFeb 9, 2023 · The ICP measurement results show the concentration of Al3+ in backwater was up to 1 × 10−4 mol/L. ... The Al/Si ratio in bauxite before feeding to the process must be enriched to more than ...
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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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WEBJan 1, 2013 · The acid leaching reactions of the bauxite would be thermodynamically easy and completed. Under the conditions that ore granularity is less than −55 μm, the L/S ratio is 100:7, and the leaching temperature is 373–383 K, the leaching time is 120 min and the concentration of HCl is 10%, both the leaching rates of Al and Fe are over 95%.
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WEBMar 1, 2019 · The concentration of REEs is much higher in Ferich (red) bauxite, compared to Fedepleted (white) bauxite (avg. ΣREE + Y+Sc = 569 ppm and 268 ppm, respectively).
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WEBModeling of the process of bauxite pretreatment with highly concentrated alkaline solutions was carried out using the SANN model. As ... The L:S ratio, Na 2 O concentration (C Na2O, g L –1), initial Al 2 O 3 concentration (C Al2O3, g L –1), and initial mean particle size (r 0, μm) were fixed at L:S = 10, r 0 = 63 μm, C Na2O = 360 g L .
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WEBJan 1, 2013 · Bauxite tailings are the main solid wastes in the ore dressing process. The Al2O3 and Fe2O3 contents in bauxite tailings can reach 50% and 13% respectively. The present study proposed a feasible ...
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WEBNov 16, 2021 · Write three balanced equations for the purifiion of bauxite by Hall's process in extraction of Al. asked Feb 26, 2019 in Chemistry by Hiresh ( points) metallurgy
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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 investigated. The results of kinetic studies allowing to compare and evaluate the effectiveness of different conditions and intensifiion factors .
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WEBJan 28, 2020 · In the alumina extraction process, bauxite ore is dissolved in caustic soda (Bayer liquor ) at high temperature. Bauxite residue, also called red mud, is produced as a waste that is stored in containment sites. ... The solid concentration increases and the collective behavior of the magnetic particle, explained in the previous section, could ...
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WEBApr 26, 2015 · Approximately 85 % of bauxite is converted to alumina (Al 2 O 3) for aluminum metal production (Liu et al. 2009), and the majority of bauxite ores are used for the production of alumina via the Bayer Bayer process is the principal industrial means of refining gibbsite bauxite. Globally, more than 90 % of alumina is .
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WEBBayer's process for concentration of bauxite. Ans. Bayer's process is used to obtain pure aluminium oxide from bauxite ore. The bauxite ore is concentrated by chemical separation. Bauxite contains impurities like iron oxide and silica. The bauxite ore is powdered and heated with sodium hydroxide under high pressure in the furnace.
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WEBMar 21, 2023 · Another method to reduce the dissolved iron in the scandium leaching process from the bauxite residue is combining the smelting of the bauxite residue and the leaching of the scandiumbearing slag. ... %, and %, respectively. The sulfuric concentration determines the leaching agent's availability to react with the minerals and .
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WEBThe bauxite is purified by the Bayer Process. First the ore is mixed with a hot concentrated solution of sodium hydroxide. The N a O H will dissolve the oxides of aluminum and silicon but not other impurities such as iron oxides, which remains insoluble. The insoluble materials are removed by method is called the chemical method.
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WEBJun 3, 2014 · The range in Ga concentrations for bauxite deposits worldwide is <10 to 812 parts per million (ppm), with an average of 57 ppm. Gallium concentrations in lateritic bauxites range from below detection (< 8 ppm) to 146 ppm; the average concentration is 57 ppm Ga. The average Ga concentration for karst bauxite deposits is 58 ppm with a .
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WEBApr 7, 2020 · 6, 58 Thus, Narich zeolite LTA, if formed in bauxite residue through addition of PO 4 3− into the Bayer liquor, can also simplify the subsequent dealkalization process of bauxite residue via ...
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WEBSep 1, 2023 · Previously, the concentration of Ga in some bauxite ores has been reported statistically, for example, 10–160 ppm (Mordberg et al., 2001), ... The formation process of karstic bauxite was complex. Its oreforming materials were transported from various sources and deposited on carbonate rocks, and then formed bauxite through diagenesis ...
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WEBMar 1, 2009 · The dissolution of aluminum hydroxides from bauxite ores constitutes a key process in the aluminum industry. Generally, ... Reaction temperature and the initial sodium hydroxide concentration were varied within the ranges 60 to 100 °C and 5 to 10 wt.% ( to mol/L), respectively, in accordance with a full 3level factorial experimental ...
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WEBThe research work, including mineralogy, process development, batch tests and pilot plant tests, is described and compared to the actual results in the industrial circuit. key words: bauxite preparation, gravity concentration, Reichert spirals.
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WEBSep 1, 2022 · A novel process of Na separation in bauxite residue to prepare compound fertilizer was proposed. ... When the concentration of K 2 O is 320 g/L, the diffraction peak of the sodiumcontaining phase disappears completely, and the main phases of the product are potassium aluminosilie and SiO 2 at 160 °C, ...
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