Iron ore, the raw material for the steel industry, is critical for the sustainable development of the global economy (Yellishetty, Ranjith and Tharumarajah 2010). ... there will be a greater focus on developing suitable beneficiation strategies to treat low-grade hematite-goethite ores containing higher levels of impurities such as silica and ...
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Although we have noted that the dithionite extraction is one of the most robust extractions, our data reveal an abundance of goethite throughout the …
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Simultaneous Extraction of Valuable Metals from Iron‐Containing Residues by Selective Chlorination and Evaporation. S. Steinlechner1 · K. Witt2. Received: 25 April 2023 / …
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Iron is usually present in leach solutions and its elimination is a major operational problem in zinc hydrometallurgy.The recovery of iron from such solutions is usually carried out by precipitation as jarosite, goethite or hematite.These residues, contaminated with heavy metals ions such as Zn, Pb, In, Ga, Ge, Co and sulphur, are …
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The equilibrium Fe isotope fractionation factor between aqueous Fe(II) and goethite has been experimentally measured to be − 1.05 ± 0.08‰ in 56 Fe/ 54 Fe (2σ) at 22 °C, using the three-isotope method. Experiments were done using two sizes of goethite (81 × 11 nm and 590 × 42 nm), and the experimental products were subjected to serial …
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Details of the common iron ore and associated gangue minerals found in many iron ore deposits and iron ore products are given in Table 2.1.The three most common iron ore minerals are magnetite, hematite (the spelling "hematite" is preferred here over "haematite"), and goethite, which together account for an estimated >99% of the …
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Iron oxyhydroxides, including ferrihydrite and goethite, serve as crucial environmental sorbents of metals in the soil settings (Cornell and Schwertmann, 2003).These Fe-bearing minerals in (micro)nodules also affect the geochemical cycling of metals in the marine environment, particularly critical metals including REY (Takahashi et …
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maximum alumina extraction Guotao Zhou, Yilin Wang,* Tiangui Qi, Qiusheng Zhou, Guihua Liu, Zhihong Peng and Xiaobin Li* The conversion of Al-substituted goethite (Al-goethite) to hematite in gibbsitic bauxite is conducive to alumina extraction during the Bayer process and the enrichment of iron minerals in red mud. In this
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Composition: Iron ore is primarily composed of iron, usually in the form of iron oxides such as hematite (Fe2O3), magnetite (Fe3O4), or goethite (FeO (OH)). It may also contain other elements or minerals as impurities, such as silica, alumina, phosphorus, sulfur, and trace elements. Physical properties: Iron ore is usually hard, dense, and heavy.
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The mechanisms of antimony extraction and zinc, iron, sulfur conservation was thermodynamically and experimentally investigated. The results show that iron- and zinc-bearing components in the goethite residue firstly reacted and releasing Fe x O y and ZnO, then stibnite (Sb 2 S 3) quickly converted to senarmontite (Sb 2 O 3) in the …
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Similar behavior was observed by Guo et al. after sulfation followed by roasting and leaching of nickel, iron, and cobalt from a laterite ore containing more than 47 pct of iron (predominantly as goethite). They also observed that metals extraction begun to decrease for roasting temperatures higher than 600 °C, but, this undesirable behavior ...
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The conversion of Al-substituted goethite (Al-goethite) to hematite in gibbsitic bauxite is conducive to alumina extraction during the Bayer process and the enrichment of iron minerals in red mud. In this work, mineralogical characteristics of gibbsitic bauxite were identified by AMICS analysis, and …
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A clean suspension magnetization roasting (SMR) technology was proposed. Iron minerals could be effectively recovered from high-iron red mud by SMR. Iron concentrate with 56.41% grade and 88.45% recovery was obtained. Phase transformations of hematite and goethite into magnetite were investigated.
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In this case, 'reactive' iron is extracted by a boiling 12 N HCl extraction (DOP=Pyrite Fe/ [Pyrite Fe+HCl-extractable Fe]). The HCl extraction removes a variety …
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The initial decomposition of iron ore is the decomposition goethite to form water vapor, and as heat transfer continues, hematite particles break into smaller particles and decompose to form Fe3O4. …
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A reactor model has been built to simulate the goethite process for iron removal. A three-factor designed set of boundary conditions was applied to determine the effect of stirring speed, gas inlet flow rate, and Fe2+ concentration. The two-phase flow velocity field, gas volume fraction distribution, mass transfer rate, and Fe2+ …
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Goethite (α-FeOOH) is the most abundant and most stable of all forms of iron-oxides in soil and its surface chemistry affects the distribution of soluble species in …
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During the dithionite extraction, goethite was completely solubilized as was the remainder of the ferrihydrite; most of the loss of oxidized magnetite also occurred during this step (also apparent in the coercivity spectra, ... We present one of the first tests of the standardized sequential extraction for iron speciation using natural samples ...
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Solvent Extraction of Iron in a Zinc Plant. The conceptual flowsheet in Figure 2 shows how the process for extracting iron by a carboxylic acid is integrated into the hydrometallurgical processing of zinc. The neutral leach and the hot acid leach will basically be the same as in the conventional Jarosite and Goethite processes.
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Goethite in #1 iron ore is mainly distributed at the boundary of pore, resulting that gas generated by decomposition easily connect with the pore. So, it is easy …
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The study showed that under optimal conditions of 9.7 M HCl and 0.4 M extractant concentration, the iron extraction rate was 97.19%. In addition, it is worth noting that the iron extraction process is endothermic, so specific temperature …
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In which iron occurs mainly as goethite, and hematite may be also present in very small portion (Zhang et al., 2018). The typical ore size was 80% passing 0.56 mm. ... The ideal case of P-extraction from goethite ore by these naturally existed alkaline-tolerant microorganism was expected to be: microorganisms can extract phosphorus for …
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The extraction of Al with NaOH and the conversi on of goethite to magne tite were carried out in the thermostated 0.5 L stainless steel reactor. The reacto r has openings for
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Indeed, these conditions enhance chloride extraction and iron leaching inhibition, while promoting corrosion stabilization. ... On the other side, the lower correlation coefficients of goethite (0 ...
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Hematite has a higher iron content than goethite or jarosite and could be used in the cement or the iron and steel industry (Röpenack et al., 1990). 4.3.3. ... Rodriguez et al. studied the utilization of deep-eutectic solvents for the extraction of zinc from goethite waste. Solvometallurgy is a new approach in the field of extractive ...
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The para-goethite iron removal process is one of the several pptn. processes used today to remove iron from zinc-rich processing solns. The para-goethite process is compared with results obtained from a study of the similar Zincor process. The distribution of iron in the Zincor iron residue was ∼50% as a combination of …
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In the case of goethite, a 2 hour CBD extraction following a pyrophosphate pre-treatment recovered only 54% and 47% of the goethite–iron (0.1 g and 0.25 g mineral samples, respectively). When compared to the CBD only extraction (i.e. no pyrophosphate pre-treatment), and 65% (0.1 g and 0.25 g mineral samples, respectively) of the …
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Bauxite residue (BR), also known as red mud, is a byproduct of the alumina production using the Bayer process. This material is not used to make iron or other iron-containing products worldwide, owing to its high content of sodium oxide and other impurities. In this study, we investigated the hydrochemical conversion of goethite …
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Zhu M, Hu X, Tu C, Zhang H, Song F, Luo Y, Christie P (2019). Sorption mechanisms of diphenylarsinic acid on ferrihydrite, goethite and hematite using sequential extraction, FTIR measurement and XAFS spectroscopy. Science of the Total Environment, 669: 991–1000. Article CAS Google Scholar
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Iron (III) was extracted by EDTA and ammonium oxalate from a model substance consisting of amorphous iron oxide, goethite, and hematite precipitated in the presence of quartz sand.
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Various studies have shown that the goethite iron removal process involves a series of complex physical processes and chemical reactions, including mass transfer …
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The capacity of two iron-based nanomaterials, namely goethite nanospheres (nGoethite) and zero valent iron nanoparticles (nZVI), to immobilize As in a polluted soil was evaluated and compared. ... and then studied by the TCLP test and the Tessier sequential extraction procedure. The influence of both nanoparticles on As speciation was ...
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The current study aimed at investigating the sorption mechanisms of DPAA on ferrihydrite, goethite and hematite using both macroscopic sorption kinetics and sequential extraction procedure (SEP) as well as microscopic Fourier transformed infrared (FTIR) and extended X-ray absorption fine structure (EXAFS) spectroscopic techniques.
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Extracting iron from its ore requires a series of steps to be followed and is considered as the penultimate process in metallurgy. The steps need the ore to be concentrated first, …
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Purwanto et al. (2003) indicated that the influence of selective reduction could speed up the nickel extraction and obstructed the iron dissolution. Thus pre-reducing makes the laterite ores more amenable to leaching. ...
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