Optimal ceramic filtration operating conditions for an iron-ore concentrate

Smith, Janet Kiholm; Sheridan, Craig; Dyk, L. Van; Naik, S. N.; Plint, N.; Turrer, Henrique Dias Gatti

doi:10.1016/j.mineng.2017.10.011

Cited by 7 publications

(4 citation statements)

References 2 publications

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“…Reactions at a solid-liquid interphase play a vital role in understanding a dissolution phenomenon. Recent research efforts have helped to improve dissolution-based processes such as the regeneration of ceramic filter media (Salmimies et al, 2013;Smith et al, 2018) and leaching iron from clays (Mandal & Banerjee, 2004). Sulfuric and nitric acid are commonly used leaching agents for iron oxides, but more effective dissolution can be achieved using a solution that contains complexing ligands.…”

Section: Introductionmentioning

confidence: 99%

Formation of Humboldtine During the Dissolution of Hematite in Oxalic Acid – Density Functional Theory (DFT) Calculations and Experimental Verification

Vehmaanperä

Gong

Sit

et al. 2021

Clays and clay miner.

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Understanding the reactions taking place in the hematite-oxalic acid system is important in order to clean iron oxides from filters and to remove iron from mineral concentrates. Previous studies reported the formation of an unwanted solid phase during this process. The objective of the current work, therefore, was to visualize and rationalize the iron dissolution steps taking place in the hematite–oxalic acid reaction by combining density functional theory (DFT) calculations and experimental data. The results of DFT calculations indicated that a precipitate was formed in this reaction; XRD analysis of the solid phase after the dissolution experiment revealed the formation of humboldtine as the precipitate. The attachment of oxalate on the hematite surface and the reduction of Fe(III) to Fe(II) were key steps for humboldtine formation. Both simulations and the experimental results showed that greater oxalic acid concentrations yielded more precipitate, suggesting a simple and novel route to synthesize humboldtine, a material which is relevant to the demand for clean energy.

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Section: Introductionmentioning

confidence: 99%

Formation of Humboldtine During the Dissolution of Hematite in Oxalic Acid – Density Functional Theory (DFT) Calculations and Experimental Verification

Vehmaanperä

Gong

Sit

et al. 2021

Clays and clay miner.

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“…T f -70 20 (11) x 3 = u-3.5 (12) An analysis of variance (ANOVA) was applied to evaluate the quality of the model fitted to the data. F-statistic (ratio between two mean squares) was used to compare the variances in the hypothesis test [44].…”

Section: Experimental Design and Statistical Analysismentioning

confidence: 99%

“…The results of these studies covered TML values from 8.00 to 16.80% and from 7.69 to 14.95%, respectively, representing considerable ranges in terms of moisture. Usually, when the mechanical removal of water from a specific variety of iron ore by means of hydrocyclones [8], thickeners [9], filters [10,11], and vacuum filters [12,13] is not sufficient to meet the TML standard, or when layout or process conditions do not permit installation of these systems, thermal drying becomes necessary.…”

Section: Introductionmentioning

confidence: 99%

Energy analysis of the convective drying of iron ore fines

Souza

Sarkis

et al. 2023

CI&CEQ

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Drying operations in iron ore processing plants have a particularly high energy demand due to the massive solid flow rates employed in this industry. A 33 full-factorial design was applied to investigate the effects of air temperature, airflow velocity, and solids load on the drying time and the specific energy consumption (SEC) of the convective drying of iron ore fines in a fixed bed. The results demonstrated that each drying air condition was associated with an optimal solids load that minimized the SEC. A load of 73 g (bed height of about 0.8 cm) was identified and validated as the optimal condition in terms of energy consumption for the configuration with the highest air temperature (90?C) and airflow velocity (4.5 m/s). This condition resulted in a drying time of 29.0 s and a corresponding SEC of 12.8 MJ/kg to reduce the solids moisture content from 0.11 to a target of 0.05 kg water/kg dry solids. The approach presented here for identifying the optimum values for the process variables should assist in the design and operation of energy efficient convective dryers for iron ore fines.

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“…For example, exploitation of dissolution phenomena can be utilized in the leaching of iron from clays, which are often used as a raw material in different processes. Moreover, the studies of Salmimies et al [1] and Smith et al [2] have shown that ceramic filter media, which are used in iron ore processes, can be successfully regenerated by acidic dissolution. A further study by Salmimies et al [3] showed that oxalic acid is a significantly better acid for magnetite dissolution than commonly used sulfuric and nitric acids, primarily because of two possible dissolution mechanisms in oxalic acid: complexation and reduction.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic and Kinetic Studies of Dissolution of Hematite in Mixtures of Oxalic and Sulfuric Acid

Vehmaanperä

Salmimies

Häkkinen

2020

Mining, Metallurgy & Exploration

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The dissolution of iron oxides in mixtures of acids is fairly uncommon but can result in a more efficient dissolution process. The objective in this work was to investigate the dissolution of synthetic hematite powder in mixtures of oxalic and sulfuric acid. Experiments were done at different acid ratios and temperatures. An increase in temperature from 15 to 35 °C increased solubility, whereas an increase from 35 to 50 °C did not change the solubility but had a profound effect on the kinetics. An important finding was that oxalic acid advanced the dissolution process since increasing the amount of oxalic acid in the system resulted in faster kinetics and higher solubilities. The dissolution kinetics were well described with the Kabai model, which was the only studied model able to describe the whole reaction time. However, the solid specific constant a varied for the different acid ratios and this is argued to be a result of changes in the solid phase. The changes in the constant a were not in line with the original study of Kabai, which indicates that a cannot be the solid specific constant but it can be the constant connected to dissolving media describing the changes in the dissolution mechanism.

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Optimal ceramic filtration operating conditions for an iron-ore concentrate

Cited by 7 publications

References 2 publications

Formation of Humboldtine During the Dissolution of Hematite in Oxalic Acid – Density Functional Theory (DFT) Calculations and Experimental Verification

Formation of Humboldtine During the Dissolution of Hematite in Oxalic Acid – Density Functional Theory (DFT) Calculations and Experimental Verification

Energy analysis of the convective drying of iron ore fines

Thermodynamic and Kinetic Studies of Dissolution of Hematite in Mixtures of Oxalic and Sulfuric Acid

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