Mechanism and kinetics of iron extraction from high silica boehmite–kaolinite bauxite by hydrochloric acid leaching

Valeev, Dmitry; Pankratov, D. А.; Shoppert, Andrei; Sokolov, A. Yu.; Kasikov, А. G.; Михайлова, А. Б.; Salazar-Concha, Cristian; Rodionov, Ilia

doi:10.1016/s1003-6326(21)65721-7

Cited by 32 publications

(18 citation statements)

References 66 publications

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“…There are various processes for extracting Al 2 O 3 from gangue [ 43 ], more commonly acid and alkali methods are used. Calcined powders are chemically active and Al 2 O 3 can be extracted by acid [ 44 , 45 , 46 , 47 ], with the following reactions occurring. Al 2 O 3 + 6H + → 2Al 3+ + 3H 2 O Fe 2 O 3 + 6H + → 2Fe 3+ + 3H 2 O …”

Section: Resultsmentioning

confidence: 99%

Preparation of Poly Aluminum-Ferric Chloride (PAFC) Coagulant by Extracting Aluminum and Iron Ions from High Iron Content Coal Gangue

et al. 2022

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Poly aluminum-ferric Chloride (PAFC) is a new type of high efficiency coagulant. In this study, high iron type gangue is used as a main raw material. It is calcined at 675 °C for 1 h and 3% CaF2 is added to the calcined powder and reacted with 20% hydrochloric acid at 93 °C for 4 h. The leaching ratio of aluminum ions is 90% and that of iron ions is 91%. After Fe2+ ions are oxidized in the filtrate, CaCO3 is used to adjust the pH of the filtrate to 0.7. The microwave power is adjusted to 80 W and the filtrate is radiated for 5 min. After being aged for 24 h, PAFC product is obtained. The prepared PAFC is used to treat mine water and compared with the results of PAC and PAF, the turbidity removal ratio of PAFC is 99.6%, which is greater than 96.4% of PAC and 93.7% of PAF. PAFC is a mixture with different degrees of polymerization. It demonstrates that extracting aluminum and iron ions from high iron content gangue to prepare PAFC by microwave is efficient and feasible.

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Section: Resultsmentioning

confidence: 99%

Preparation of Poly Aluminum-Ferric Chloride (PAFC) Coagulant by Extracting Aluminum and Iron Ions from High Iron Content Coal Gangue

et al. 2022

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“…The next pair of sextets poorly resolved at room temperature, upon cooling to the boiling point of nitrogen, transforms into a pair of well-defined sextets with parameters close to goethite [39]. The reason for the low value of the effective magnetic field even at low temperatures is the partial replacement of iron atoms by aluminum, with the formation of Al-goethite -α-Fe1-xAlxOOH, for which the temperature transformations of the spectrum are discussed in detail in [16]. The paramagnetic part of the high-temperature Mössbauer spectra may have a dual nature.…”

Section: The Nature Of the Al-containing Phase In The Raw Materialsmentioning

confidence: 95%

“…Different methods of iron production from BR have been studied so far. These methods can be divided into pyro-and hydrometallurgical [16]. Pyrometallurgical methods include magnetic separation after preliminary reductive roasting [17], reductive sintering with different fluxes [18,19], and smelting BR with a reducing agent to make pig iron [20,21].…”

Section: Introductionmentioning

confidence: 99%

High-Iron Bauxite Residue (Red Mud) Valorisation Using Hydrochemical Conversion of Goethite to Magnetite

Shoppert¹,

Valeev²,

Diallo³

et al. 2022

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Bauxite residue (BR), also known as red mud, is a by-product of the production of alumina via the Bayer process. Because of the high sodium oxide and other impurities content, this material is not used to obtain iron or other iron-containing products. In this paper, the hydro-chemical conversion of goethite (FeOOH) to magnetite (Fe3O4) in high-iron BR from the Friguia alumina refinery (Guinea) by Fe2+ ions in highly concentrated alkaline media was studied. The simultaneous extraction of Al and Na made it possible to obtain a product containing more than 96% Fe3O4. The results show that the magnetization of Al-goethite and Al-hemetite accelerates the dissolution of the Al from the iron mineral solid matrix and from the desilication product (DSP). After ferrous sulfate (FeSO4·7H2O) was added directly at the FeO:Fe2O3 molar ratio of 1:1 at 120 °C for 150 min in the solution with the 360 g L-1 Na2O concentration, the alumina extraction ratio reached 96.27% for the coarse bauxite residue size fraction (Sands) and 87.06% for fine BR obtained from red mud. The grade of iron (total iron in the form of iron element) in the residue can be increased to 69.55% for Sands and 58.31% for BR. The solid residues obtained after leaching were studied by XRD, XRF, TG-DTA, VSM, Mössbauer spectroscopy and SEM to evaluate the conversion and leaching mechanisms and the recovery ratio of Al from different minerals. The iron-rich residues can be used in the steel industry or as a pigment.

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“…The shrinking core model (SCM) is commonly used to describe the heterogeneous reaction between liquid media reagent and a porous solid compound with a uniform particles size [38,39]. There are three main equations derived for the processes limited by: diffusion through the liquid film (external diffusion, Equation ( 2)), diffusion through the inert porous solid product of reaction (internal diffusion, Equation ( 3)), and surface chemical reaction (Equation ( 4…”

Section: Kinetics Study Of Sc Leaching With Mgsomentioning

confidence: 99%

High-Selective Extraction of Scandium (Sc) from Bauxite Residue (Red Mud) by Acid Leaching with MgSO4

et al. 2022

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Bauxite residue, also known as red mud (RM), from alumina production is the most promising technogenic material for the production of scandium (Sc) and other rare earth elements (REEs). Conveniently, RM is processed by using a strong acid (pH < 2.5), which lead to co-dissolution of iron and other undesirable major components. In this work, for the first time, the possibility of selective extraction of scandium from red mud by using highly diluted acid (pH > 4) in the presence of MgSO4 was shown. The effect of temperature (40–80 °C), time (0–60 min), pH (2–5), and the MgSO4 concentration (12–36 g L−1) on Sc extraction efficiency was evaluated. It was shown that Sc extraction was higher than 63% even at a pH of 4, at 80 °C, after 1 h, while more than 80% could be extracted at a pH of 2. Iron extraction reduced from 7.7 to 0.03% by increasing the pH from 2 to 4. The kinetics study using the shrinking core model (SCM) has shown that diffusion through a product layer is a rate-limiting stage of the process at high temperatures (>60 °C) and low pH (<3), whereas, at lower temperatures and higher pH values, the leaching rate is limited by diffusion through the liquid film.

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Mechanism and kinetics of iron extraction from high silica boehmite–kaolinite bauxite by hydrochloric acid leaching

Cited by 32 publications

References 66 publications

Preparation of Poly Aluminum-Ferric Chloride (PAFC) Coagulant by Extracting Aluminum and Iron Ions from High Iron Content Coal Gangue

Preparation of Poly Aluminum-Ferric Chloride (PAFC) Coagulant by Extracting Aluminum and Iron Ions from High Iron Content Coal Gangue

High-Iron Bauxite Residue (Red Mud) Valorisation Using Hydrochemical Conversion of Goethite to Magnetite

High-Selective Extraction of Scandium (Sc) from Bauxite Residue (Red Mud) by Acid Leaching with MgSO4

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