Iron leaching from China clay with oxalic acid: effect of ...

2021-7-29 · iron leaching by oxalic acid from iron-rich China clay is necessary. Veglio et al. (1996) studied the effects of main factors which can potentially influence the iron-dissolution process by oxalic acid using a relatively low iron containing (0.84% as Fe 2O 3) kaolin. The use of culture filtrate of an oxalic acid producing A. niger

(PDF) Dissolution of Nickel Oxide in Oxalic Acid Aqueous ...

The surface complexes for iron oxides analogous to FeHC 2 O 4 and FeC 2 O − 4 account for the observed negative values of the zeta potential values of …

Thermodynamic analysis of the reactions of iron oxides ...

At all oxalic acid concentrations (1, 0.1 ions of bivalent and trivalent iron are [Fe2+(C204)2]2- and and 0.01 M) the fraction of Fe(C204)34- in the solution is very [Fe3+(C204)3P-, As the oxalic acid concentration increases low (less than 0.0035) and gradually decreases as the oxalic acid the stability region of the above complex ions is ...

Dissolution of Iron Oxide Rust Materials using Oxalic Acid ...

DOI: 10.2473/shigentosozai.115.815 Corpus ID: 100452023. Dissolution of Iron Oxide Rust Materials using Oxalic Acid @inproceedings{SungOh1999DissolutionOI, title={Dissolution of Iron Oxide Rust Materials using Oxalic Acid}, author={Lee Sung-Oh and Oh Jong-Kee and Shin Bang-Sup}, year={1999} }

Oxalic acid capped iron oxide nanorods as a sensing …

A label free impedimetric immunosensor has been fabricated using protein bovine serum albumin (BSA) and monoclonal antibodies against Vibrio cholerae (Ab) functionalized oxalic acid (OA) capped iron oxide (Fe3O4) nanorods for V. cholerae detection. The structural and morphological studies of Fe3O4 a …

Oxalic Acid Regeneration of Ceramic Filter Medium Used …

2012-11-20 · In iron ore applications, oxalic acid can be used for the regeneration as it has been shown to efficiently dissolve iron oxides [1–9]. Although the regeneration of ceramic membranes fouled by oxide particles has been receiving an increasing attention in cross flow filtration [ 10 – 13 ], published research on the regeneration of the ceramic ...

Kinetics of Leaching of Iron Oxide in Clay in Oxalic Acid ...

2020-8-21 · Iron oxide in samples of clay containing 8.15% iron oxide was leached in aqueous oxalic acid and hydrochloric acid solutions. Leaching experiments were conducted in the temperature range of 40–80°C for times up to 90 minutes in 0.2 M to 2 M acid solutions. The mixed kinetic mechanism seemed to be the most appropriate model to fit the kinetic data of …

Dissolution kinetics of iron oxides in clay in oxalic acid ...

Clay samples containing 8.15% iron oxides and 27.49% alumina were leached in oxalic acid. Leaching experiments were performed in aqueous solutions of oxalic acid of 0.2–2 mol/L at 40–80°C for up to 90 min.

Dissolution of iron oxide using oxalic acid | Request PDF

2021-12-18 · Some research showed that, in the solution containing 0.19 M oxalic acid, the highest dissolution rate of iron oxides was obtained at pH 2.5 when pH increased from 1.0 to 5.0 [26, 27]. A similar ...

Differential Effects of Low-Molecular-Weight Organic Acids ...

The solubilisation of iron oxides by the organic acids appears to play a critical role in mobilizing other trace metals and As. Apart from acidification and complexation, reductive dissolution played a dominant role in the dissolution of iron oxides in the presence of oxalic acid, while acidification tended to be more important for dissolving ...

Dissolution of Iron Oxides Highly Loaded in Oxalic Acid ...

2021-4-26 · Oxalic acid has been identified as a sustainable chemical enabling an efficient recovery of target metals from industrial minerals by dissolution. The dissolution process recently has attracted attention as a key reaction in a potential clean iron-making. In ...

Study on the kinetics of iron oxide leaching by oxalic acid

The dissolution of iron oxides in oxalic acid was found to be very slow at temperatures within the range 25–60 °C, but its rate increases rapidly above 90 °C. The dissolution rate also increases with increasing oxalate concentration at the constant pH values set within the optimum range of pH2.5–3.0. At this optimum pH, the dissolution of ...

Kinetics of Leaching of Iron Oxide in Clay in Oxalic Acid ...

2020-8-21 · mechanisms of dissolution of iron oxides in aqueous oxalic acid solution. Lee et al. worked on the [8] optimization of pH level and pH control during leaching in oxalic acid solution. Ambikadevi and Lalithambika [9] tested several organic acids and concluded that oxalic acid is most efficient to dissolve iron oxide from ceramic minerals.

Mechanisms of dissolution of iron oxides in aqueous oxalic ...

It is well known that the dissolution process is assisted by chelating agents such as EDTA and oxalic acid [4-7,14,16,19,22,28,29]. Photochemical effects: The dissolution of iron oxides suspended in organic acid solutions is promoted by ultraviolet and …

Dissolution of iron oxide using oxalic acid | Semantic Scholar

2007-7-1 · Dissolution of iron oxide using oxalic acid. Abstract Iron oxide is the main contaminant of clay and silicate minerals used during the production of high quality ceramics. Its content has to be removed to generally less than 0.1% for achieving the required whiteness of 90% ISO or higher for clay and silicate materials.

Study on the kinetics of iron oxide leaching by oxalic acid

2006-9-1 · The dissolution of iron oxides in oxalic acid was found to be very slow at temperatures within the range 25–60 °C, but its rate increases rapidly above 90 °C. The dissolution rate also increases with increasing oxalate concentration at the constant pH values set within the optimum range of pH2.5–3.0.

Nanomaterials | Free Full-Text | Oxalic Acid-Induced ...

The fate of arsenic in the water environment is of great concern. Here, the influences of oxalic acid and UV light illumination on the dissolution of naked ferrihydrite (Fhy), Fhy loaded with As(V) [Fhy*-As(V)], as well as the fate of …

Mechanisms of dissolution of iron oxides in aqueous oxalic ...

Some research showed that, in the solution containing 0.19 M oxalic acid, the highest dissolution rate of iron oxides was obtained at pH 2.5 when pH …

Oxalic Acid in Root Exudates Enhances Accumulation of ...

2020-10-21 · Oxalic acid enhances dissolution of metallic ions, iron/aluminum oxides, and organic matters from soils and forms oxalate–metal complexes, based on nuclear magnetic resonance spectra, ultraviolet spectra, and analyses of metal ions, iron/aluminum

Dissolution kinetics of iron oxides in clay in oxalic acid ...

2012-12-9 · Clay samples containing 8.15% iron oxides and 27.49% alumina were leached in oxalic acid. Leaching experiments were performed in aqueous solutions of oxalic acid of 0.2–2 mol/L at 40–80°C for up to 90 min. The mixed kinetic mechanism, i.e., t/τ = [ (1–2 X /3)− (1− X) 2/3 ]+ b [1− (1− X) 1/3 ], seemed to be the most appropriate ...

Study on the kinetics of iron oxide leaching by oxalic acid

2006-9-1 · The iron oxides dissolution process in oxalic acid was found to be very slow at the range of temperatures between 25 and 60 °C (Lee et …

Photodissolution of iron oxides. 3. Interplay of ...

Comparison of the photocatalytic efficiency of TiO2, iron oxides and mixed Ti(IV) Fe(III) oxides: photodegradation of oligocarboxylic acids. Journal of Photochemistry and Photobiology A: Chemistry 1994, 84 (2), 183-193.

Study on the kinetics of iron oxide leaching by oxalic acid

Study on the kinetics of iron oxide leaching by oxalic ...

Mechanisms of dissolution of iron oxides in aqueous oxalic ...

1996-9-1 · It is well known that the dissolution process is assisted by chelating agents such as EDTA and oxalic acid [4-7,14,16,19,22,28,29]. Photochemical effects: The dissolution of iron oxides suspended in organic acid solutions is promoted by …

Study on the kinetics of iron oxide leaching by oxalic acid

Study on the kinetics of iron oxide leaching by oxalic acid. Download. Related Papers. Photocatalytic degradation of organics in water in the presence of iron oxides: Influence of carboxylic acids. By Fernando Beltrán and Eva Rodríguez.

Dissolution of iron from iron (Hydr)Oxides by mugineic …

2018-6-8 · Dissolution of Fe from Fe Oxides by Mugineic Acid 307 Table 1. Characteristics of Fe (hydr)oxides. NH4 -oxalate- NH4-oxalate-Sample Sample soluble extractable Fe Mineralogyb Source or No. code components'' (Feo )" preparation methods (g kg-I) (g kg-I) 0-20 0 4 Ot Atkinson et al. 1968 2 O-w 0 4 Ot Okamoto and Shirane 1976

Optimization of Ilmenite Dissolution by Synergistic Effect ...

This study was carried out to investigate the interaction of oxalic acid with hydrochloric acid to attain the better performance for iron dissolution in comparison to absence of oxalic acid. The effects of oxalic acid on ratio of hydrochloric acid, acid concentration, ratio of liquid to solid, temperature and dissolution time are investigated for the dissolution of Fe and Ti from ilmenite …

Dissolution of Iron Oxides Highly Loaded in Oxalic Acid ...

The experimental results and proposed stoichiometries identified a minimum amount of oxalic acid required for the complete dissolution of iron oxide independently from the concentration and type of loaded iron oxide. Among iron oxides tested (α-Fe 2 O 3, FeOOH and Fe 3 O 4) as the feedstock, Fe 3 O 4 had an advantage in the dissolution rate ...

Sung Oh Lee, Tam Tran, Byoung Hi Jung, Seong Jun Kim ...

Iron oxide in samples of clay containing 8.15% iron oxide was leached in aqueous oxalic acid and hydrochloric acid solutions. Leaching experiments were conducted in the temperature range of 40–80°C for times up to 90 minutes in 0.2 M to 2 M acid solutions.

Catalytic dissoluion of iron(III)(hydr)oxides by oxalic ...

Catalytic dissoluion of iron(III)(hydr)oxides by oxalic acid in the presence of Fe(II) D. Suter 1, C. Siffert 1, B. Sulzberger 1 & W. Stumm 1 Naturwissenschaften volume 75, pages 571–573 (1988)Cite this article

Dissolution of iron oxide using oxalic acid

2007-7-1 · Conclusions. Oxalic acid was used to dissolve iron oxide from hematite, synthetic iron rust (containing iron hydroxide and hydroxyoxide) and a clay material. The critical effect of solution pH was confirmed with optimum dissolution taking place at pH2.5–3.0.

Dissolution of Iron Oxide Rust Materials using Oxalic Acid

It was found that the dissolution of iron oxide rust was very slow at temperatures ranging from 25°C to 60°C, but increased rapidly as temperature became above 90°C. An increase in concentration of oxalic acid in the range of 0.048~0.476mol/l increased the dissolution rate, whereas the pH caused some passivation (at pH > 2.5) after ...

Dissolution of Iron Oxides Highly Loaded in Oxalic Acid ...

dissolve iron (molar ratio of oxalic acid to iron loaded in the solution: OxA/Fe) has not been reported regardless of its importance for minimizing the consumption of oxalic acid. The dissolution of iron oxides is unlikely to simply follow the Eq. (1), considering the presence of several types of iron oxalates in the solution as mentioned above. Fe

Dissolution kinetics of iron oxides in clay in oxalic acid ...

Clay samples containing 8.15% iron oxides and 27.49% alumina were leached in oxalic acid. Leaching experiments were performed in aqueous solutions of oxalic acid of 0.2-2 mol/L at 40-80°C for up to 90 min. The mixed kinetic mechanism, i.e., t/τ=[(1-2 X/3)-(1- X) 2/3 ]+ b[1-(1- X) 1/3 ], seemed to be the most appropriate one to fit the kinetic data of leaching iron oxides …

Dissolution of Iron from Oxides in a Solution of Citric ...

In this work, the dissolution of iron from a kaolinitic mineral (Veracruz, México) is compared with that from an iron ore (Michoacán, México), a specular hematite (México), a magnetite (southeastern Utah, USA) and a hematite (from Arizona, USA), using sodium thiosulfate and citric acid, as the reducing and complexing agents, respectively.

Dissolution of iron oxide using oxalic acid

As the dissolution requires a pH controlled in the region 2.5–3.0 for maximum reaction rate, it is essential to create a hydroxide-oxalate mixture for use in the leaching process. The characteristics of NaOH-, KOH- and NH 4 OH-oxalic acid mixtures were also determined in this study. Due to the precipitation of salts such as Na 2 C 2 O 4(s ...

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