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The refractory bauxite needs to present less than 2.5% of Fe 2 O 3 to be applied in the ceramics industry. The depletion of high Al 2 O 3 grade deposits has stimulated the improvement of bauxite concentration methods in order to remove iron-bearing minerals. The objective of this study was to evaluate the influence of collector dosage, pH and ...
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Removal of sulfur is a crucial problem for high effective development and utilization of abundant high-sulfur bauxite resources. The sulfur-containing minerals in high-sulfur bauxite are pyrite and its isomers (marcasite and melnikovite), and sulfates such as CaSO 4 (Liu et al., 2018a), the pyrite is the main sulfur-containing minerals. During the Bayer process, the pyrite …
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This is due to the formation of lamellar hydroxyl—sodalite (OH—SOD) which is deposited on the surface of kaolinite and hinders the further dissolution of kaolinite. Under the optimum conditions, the A/S (mass ratio of Al 2 O 3 to SiO 2) of dissolved residues is increased to 8.55, while the A/S of the bauxite is only 4.97.
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As SiO 2 in bauxite I is characteristic (Fig. 2), some free SiO 2 phase in pellet I is still found after high temperature sintering . The hematite (Fe 2 O 3) phase is the main Fe-containing phase in both pellets. However, pellet II contains also small amount of Fe in compound with silicon oxide.
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The removal capacity of raw bauxite is comparable to other non-conventional adsorbents, such as neem sawdust, sugar cane dust and cane root carbon. ... (Fe 2 O 3), 6 wt.% quartz (SiO 2), 4 wt.% a ...
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In addition, the biological methods demand a long cycle to desilication. According to the dissolving properties of diaspore and kaolinite under different reaction conditions, Yang et al.6 used sodium hydroxide solution to leach bauxite ore directly. The removal of SiO 2 reached 42.5%, and the A/S of the bauxite concentrate increased from 7.6 to ...
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A combined method of solid-phase alkali activation and surface precipitation was used to prepare the lithium/aluminum layered double hydroxides-SiO2 loaded bauxite (LDH-Si-BX) and applied to ...
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The appropriate and economical conditions for removing the impurities were found to be calcining the bauxite at 550 °C, and leaching it with a sulfuric acid solution of 1.2 mol/L, sulfuric acid ...
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Process X: applied for red bauxite to remove iron oxide (chief impurity) Process Y: applied for white bauxite to remove Z (chief impurity). Then, Process X and impurity Z are: View Solution. Q4. Observe the following statements regarding purification of bauxite: I. During Hall's process, silica is removed as Si (vapour).
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For achieving this purpose, iron removal tests were performed on bauxite samples with an alumina to silica modulus of 0.73. After determining the appropriate iron removal method among the magnetic ...
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grade bauxite. Keywords Low grade bauxite Acid leaching Potassium removal Iron removal Introduction Bauxite found in china, with the mineral feature of diaspore [1], is an important raw material for refractory industry, and China is also a major exporter of refractory materials in the world [2]. Shortages of bauxite resources are very severe
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The concentrate with the mass ratio of Al2O3 to SiO2 (m(Al2O3)/m(SiO2)) 8.90 and the recovery of Al2O3 86.98% is obtained from bauxite ore (m(Al2O3)/m(SiO2)=5.68) in pH range of …
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The mineralogical characteristics of low SiO 2 bauxite in Guinea (SiO 2 . 3%) are studied, and the results are presented in Fig. 3 [41].. The main minerals were boehmite, gibbsite, goethite, hematite, and Al-substituted goethite. ... and the iron removal rate was 85.32% in non-magnetic materials under a pre-roasting temperature of 750 °C for 30 ...
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Thus, in given options, C a O is the flux to remove impurities in S i O 2. Was this answer helpful? 0. Similar Questions. Q1. Name the flux to remove the impurity of S i O 2. View Solution. Q2. In aluminium extraction by the Bayer process, alumina is extracted from bauxite by sodium hydroxide at high temperatures and pressures.
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As seen below the mass fraction of iron in original BR was significantly reduced from 21 wt% to 3.5 wt% after the iron removal treatment while the concentration of the Al 2 O 3, SiO 2, CaO and TiO 2 as well as REEs were increased. 90% of the REEs such as La 2 O 3, Ce 2 O 3, Sc 2 O 3 and Y 2 O 3 were recovered in the iron-removed bauxite residue.
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After 15 days of incubation, strains H19 and G21 were found to remove 56.5–57.5% of Si from the bauxite. Notably, the ratio of Al 2 O 3 /SiO 2 of the bioleached bauxite was …
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The mineralogical characteristics of low SiO 2 bauxite in Guinea (SiO 2 <3%) are studied, and the results are presented in Fig. 3 [41]. The main minerals were boehmite, gibbsite, goethite, hematite, and Al-substituted goethite. ... and the iron removal rate was 85.32% in non-magnetic materials under a pre-roasting temperature of 750 °C for 30 ...
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There is currently no widely accepted alternative method for removing silica from Bayer liquor which does not lead to soda loss. A side implication of this is that bauxites containing high …
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Process X: applied for red bauxite to remove iron oxide (chief impurity) Process Y: applied for white bauxite to remove Z (chief impurity). Then, Process X and impurity Z are: X = Hall - Heroults process & Y = S i O 2; X = Serpecks process and Y = iron oxide; X = Bayers process and Z = S i …
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0.7% is called high-sulfur bauxite. Such bauxite is mainly composed of alumina in middle-high proportion, silicon oxide in middle-low proportion, sulfur in high proportion (sulfur content is greater than 0.7%) and middle-high A/S (weight ratio of Al 2O 3 to SiO 2) bauxite [2]. FeS 2,asthe main sulfur-containing mineral of high-sulfur bauxite ...
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In our previous study, TiO 2 was enriched through stepwise removal of SiO 2 and Al 2 O 3 via H 3 PO 4 and NaOH leaching from non-magnetic material, which was derived from …
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Aluminum-silicates such as pyrophyllite, illite, kaolinite and chlorite are impurity minerals in diasporic-bauxite, it being necessary to remove these silicate minerals to improve the mass ratio of Al 2 O 3 /SiO 2 of diasporic-bauxite for the Bayer process.
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These operations – scrubbing and desliming – were necessary to remove the slimes, otherwise it would face froth control problems. After this separation, the feed sample presented 23.9% available alumina (AA), 43.7% insoluble silica (In SiO 2), and 0.9% reactive silica (Re SiO 2).
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The bauxite used in this experiment was sampled from Guizhou, China; its chemical composition is shown in Table 1. The A/S mass ratio of the bauxite is 4.24, and its total sul-fur content (ST) is 2.66wt%. Table 1. Chemical composition of bauxite wt% …
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Quartz-SiO 2, and Kaolinite-Al 2 Si 2 O 5 (OH) 4. The chemical analysis results of the bauxite ore are shown in Table 1. The SEM analyses were carried out with a Zeiss/EVO MA10 model device (Germany). The SEM images and EDX data of the bauxite ore are shown in Fig. 1. Experimental Method In this study, the recovery of precious metals from ...
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In this paper, the major impurities present in most Bayer circuits and the various removal mechanisms and strategies that exist to manage them are reviewed, and some of the issues …
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Process Y: applied for white bauxite to remove Z (chief impurity). Then, Process X and impurity Z are: View Solution. Q4. In the extraction of aluminium Process X: applied for red bauxite to remove iron oxide {chief impurity}
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Aluminum production from bauxite is achieved with the Bayer process, which is a hydrometallurgical method. However, in the Bayer process, in time, it is possible to encounter problems such as the formation of excessive amounts of red mud in aluminum production, its environmental risks, its requirement of large storage sites, the excessive production of …
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The bauxite contained 48.8 % Al 2 O 3, of which 37 % was present as boehmite, 9.1 % SiO 2, all in kaolini te. The kinetic test was carried out at 100 o C in a liquor that contained 149.5 g/L ...
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Abstract — A bauxite ore can be utilized in Bayer Process, if the mass ratio of Al 2 O 3 to SiO 2 is greater than 10. Otherwise, its Fe x O y and SiO 2 content should be removed. On the other hand, … Expand
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