Iron removal from kaolin by oxalic acid using a novel pre-agitating …
The filamentous fungus Aspergillus niger can produce large amounts of organic acids (especially oxalic acid) which can be used for the removal of the iron contained as …
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Iron removal from red clay using oxalic acid leaching for …
In the oxalic acid solution, eq., the bi-oxalate ion (C 2 H 2 O 4) is released when C 2 H 2 O 4 (aq) dissociates. In equation, the bi-oxalate ion forms dissociate to produce oxalate ions (C 2 O 4) −2.As demonstrated by eq., it is clear from equations, that the bioxalate is in charge of removing the iron impurities from the red clay surface. 2.4. Preparation of ceramic tiles
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Uses of Oxalic Acid
Oxalic acid in organic and raw form is non-lethal. But sometimes it can have harmful effects on the body as well. 4. Other Uses. So, in addition to using the chemical for bleaching, and removing rust and stain, oxalic acid is mostly used as a reducing element in developing photographic film.
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Iron Removal from Kaolin Waste Dumps by Chemical (Oxalic and …
The chemical leaching of iron in kaolin was performed with RSM, using oxalic and citric acid concentrations (20, 60, and 100 mM), kaolin pulp amounts (1, 4, and 7%), and time (7, 30, and 60 days) as the independent variables and the amount of iron eliminated (%Fe Reduced) as the only dependant variable.
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Biological Beneficiation of Kaolin: A Review on Iron Removal
Keywords: Kaolin, Iron, Oxalic acid, Bioleaching, Bioflocculation, Bioflotation. 2 1. Introduction ... The iron removal processes can be categorized as physical, chemical, or a combination of
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Iron Removal from Kaolin. Comparison between "In Situ
The filamentous fungus Aspergillus niger can produce large amounts of organic acids (especially oxalic acid) which can be used for the removal of the iron contained as impurity in kaolin.
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Study on the kinetics of iron oxide leaching by oxalic acid
Taxiarchou et al. (1997a) used 0.1–0.5 M oxalic acid (pH1–5) to dissolve iron from a 20% w/v slurry of a coarse silica sand (83% of particle size in the range 0.18–0.35 mm, containing 0.029% Fe 2 O 3). The iron oxide concentration in the leach is equivalent to 0.058 g/L Fe 2 O 3. These authors found that the maximum iron extraction of ...
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Iron removal from kaolin by oxalic acid using a novel pre-agitating …
This study reports a leaching process along with a novel physical pretreatment technique to remove iron impurities from kaolin using oxalic acid. A detailed examination of the physical properties of the minerals confirmed that almost none of the leaching-resistant iron oxides, specifically hematite, was completely interlocked with the clay ...
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Leaching of Ibute-Nze kaolin iron-oxide impurity with …
The goal of this research was to remove iron oxide from Ibute-Nze kaolin by dissolving the clay mineral in an aqueous oxalic acid solution and optimizing the process.
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Leaching kinetics of iron from coal-series kaolin by oxalic …
By acid leaching at 100 oC with 0.15 M oxalic acid and 90 min reaction time, the brightness could up to 80% (Veglio et al., 1993; Ambikadevi and Lalithambika, 2000). Xia et al. (2012) studied a …
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(PDF) Iron Removal from Kaolin Using Oxalic Acid
Journal of the Mexican Chemical Society. In the present study, oxalic acid was used as a leaching reagent to remove iron from a kaolin mineral. Statistical analysis was conducted to determine the most influential factors in the dissolution of iron from the kaolin mineral.
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(PDF) Iron removal from red clay using oxalic acid leaching for
This work focused on removing iron with oxalic acid from red clay samples collected from Kapasia Upazila, Gazipur District, Bangladesh. To characterize the red clay, the study employed several ...
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Effect of oxalic acid concentrations on iron removal …
The influence of the temperature on the iron leaching from kaolin with oxalic acid solutions has been observed previously in stirred-tank reactors (Arslan, 2021; Taran & Aghaie, 2015), leading to ...
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Kinetic Study of Iron Dissolution from Low Grade Kaolin Using Oxalic
Hematite dissolution with oxalic acid can be expressed by: H+ + Fe2O3 + 5HC2O4- = 2Fe(C2O4)22- + 3H2O + 2CO2 (1) Effect of acid concentration In order to observe the effect of oxalic acid concentration in the ranges of 0.01-0.5 M, experiments were performed at 50 ºC, with a stirring speed of 300 rpm and using kaolin sample fraction of -75+45 µm.
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Leaching of Ibute-Nze kaolin iron-oxide impurity with oxalic acid
The goal of this research was to remove iron oxide from Ibute-Nze kaolin by dissolving the clay mineral in an aqueous oxalic acid solution and optimizing the process. The chemical composition of the raw and modified clay was determined using x-ray fluorescence, and the morphology of the solid sample was determined using a scanning electron microscope.
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Iron removal from kaolin by oxalic acid using a novel pre-agitating …
This study reports a leaching process along with a novel physical pretreatment technique to remove iron impurities from kaolin using oxalic acid. A detailed examination of the physical properties of the minerals confirmed that almost none of the leaching-resistant iron …
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(PDF) Refinement of industrial kaolin by microbial …
In the present study, oxalic acid was used as a leaching reagent to remove iron from a kaolin mineral. Statistical analysis was conducted to determine the most influential factors in the dissolution of iron from the kaolin mineral. Our goal …
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REFINEMENT OF NIGERIAN KAOLIN BY WET …
removal of iron oxide using oxalic acid from 1.92 to 0.60 % for ferric oxide and 2.62 to 1.05 % for titanifferous oxide in Alkaleri and 3.45 to 1.17% for ferric oxide and 4.28 to 1.98 for ...
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Effect of temperature on bioleaching of iron impurities from …
Maximum oxalic acid production occurs at a pH of 6 –7. But when the pH is lower, citric acid predominates [21,23]. The use of oxalic acid produced by the fungal to dissolve iron impurities from kaolin has been the subject of many studies. The important factors for iron removal from kaolin in microbiological tests are the pH,
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Designing and optimization of separation process of iron …
Kaolin leaching by oxalic acid in a bench-scale stirred-tank reactor using response surface methodology and face centered central composite design based on three variables: oxalic acid concentration (X 1: 0.1–0.3 M), temperature (X 2: 30–80 °C) and duration of the leaching test (X 3: 2–4 days) was investigated. The experimental data obtained were fitted to a second …
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Why Is Oxalic Acid Used In Removing Iron I Kaolin
model, improving acid concentration and leaching temperature could promotes the removal of iron from coal-series kaolin. Keywords: coal-series kaolin, leaching kinetics, iron removal rate, oxalic acid 1. Introduction Considering the numerous usage in ceramics, paper, paints, fiberglass, inks, pharmaceuticals, and
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Iron removal from kaolin. Comparison between "in situ" and "two …
The filamentous fungus Aspergillus niger can produce large amounts of organic acids (especially oxalic acid) which can be used for the removal of the iron contained as …
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Iron Removal from Kaolin Waste Dumps by Chemical (Oxalic and …
Time was found to be the most influential variable, although oxalic acid must be present to leach 32% of the iron. Biological leaching was also assayed for 14 days using a …
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Leaching kinetics of iron from low grade kaolin by oxalic acid
DOI: 10.1016/J.CLAY.2011.01.011 Corpus ID: 97937721; Leaching kinetics of iron from low grade kaolin by oxalic acid solutions @article{MartnezLuvanos2011LeachingKO, title={Leaching kinetics of iron from low grade kaolin by oxalic acid solutions}, author={Antonia Mart{'i}nez-Lu{'e}vanos and M. G. Rodr{'i}guez-Delgado and Alejandro Uribe-Salas and F. R. Carrillo-Pedroza and J. …
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Thermodynamic analysis of stability in iron removal from kaolin by
The graphical representation of global stability for a system, or Pourbaix diagram, was constructed to perform a thermodynamic study of iron removal from kaolin using oxalic acid as an oxidant. To do this the free energies of formation of the oxalate complex of the system were calculated, and it was found that the more stable specie is Fe(C2O4)3-3, with a calculated free …
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Dissolution of iron oxide using oxalic acid
Biological processes have also been evaluated, most recently by Mandal and Banerjee (2004) who presented their results of a study on the use of Aspergillus niger and their cultural filtrates for removing iron from a China clay. Using oxalic acid, the dissolved iron can be precipitated from the leach solution as ferrous oxalate, which can be ...
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Optimization and kinetics of oxalic acid treatment of feldspar for
ABSTRACT The presence of iron impurity in feldspar lowers its commercial value due to imparting unwanted colors to the final products. This study concerns the dissolution of iron from an Iranian feldspar using oxalic acid as the leaching agent. In this regard, initial tests were conducted to fix primary parameters at the best values: pH, 2; agitation rate, 1000 rpm; particle …
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(PDF) Iron Removal from Kaolin Using Oxalic Acid
In the present study, oxalic acid was used as a leaching reagent to remove iron from a kaolin mineral. Statistical analysis was conducted to determine the most influential factors in the …
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Leaching of Ibute-Nze kaolin iron-oxide impurity with oxalic …
The goal of this research was to remove iron oxide from Ibute-Nze kaolin by dissolving the clay mineral in an aqueous oxalic acid solution and optimizing the process. The
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Iron removal from kaolin by oxalic acid using a novel pre-agitating …
Abstract This study reports a leaching process along with a novel physical pretreatment technique to remove iron impurities from kaolin using oxalic acid. A detailed examination of the physical properties of the minerals confirmed that almost none of the leaching-resistant iron oxides, specifically hematite, was completely interlocked with the clay minerals. Accordingly, a pre …
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