About the interchangeability of iron-manganese nodules of the Pacific and the Baltic Sea

Сулимова, М. А.

doi:10.1088/1757-899x/919/6/062039

Cited by 2 publications

(2 citation statements)

References 6 publications

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“…The main ways of technological gas purification from polluting components are mechanical purification and physicochemical methods, which are most often used with various mineral sorbents based on manganese materials, , zeolites, and active coals of different origins, sorbents based on metal oxides, , and other synthetic materials. , The process of sorption and purification of gases from sulfur-containing and other components is often accompanied by the conversion process, as in the work, in which the study of sorption of hydrogen sulfide on CaCO 3 was carried out, as a result of which conversion of H 2 S → CaS was observed.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Characteristics of the Hydrogen Sulfide Sorption Process by Ferromanganese Materials

et al. 2022

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The work analyzes hydrogen sulfide sorption from model gas mixtures containing H 2 S from 1.25 × 10 −3 to 1.28 × 10 −4 mol/L under static conditions at temperatures 253 and 298 K on the raw manganese ore of the Ulu-Telyak deposit (Bashkortostan, Russia), manganese(IV) oxide, and manganese(IV) and iron(III) oxide mixtures. The thermodynamic models for calculating the equilibrium constants and Gibbs energy changes were analyzed. The sorption isotherms were described by the Langmuir, Freundlich, Temkin, and Dubinin−Radushkevich models. The value of enthalpy H (253 298) 0 Δ − of hydrogen sorption on the ore was −68.98 ± 3.45 kJ/mol and those on model mixtures Mn 4 + Fe 2 O 3 and MnO 4 were ±12.20 kJ/mol and −103.826 ± 5.19 kJ/ mol, respectively, and the entropies of the hydrogen sulfide sorption process on three manganese materials at 253 K were calculated.The limiting capacity values of manganese materials at 253 and 298 K were obtained. The morphological analysis of the ore samples, Mn 4 + Fe 2 O 3 , and MnO 4 , before and after hydrogen sulfide sorption, was carried out at 253 K. The obtained thermodynamic parameters determine the advantage of using the raw manganese ore over pure oxides, which characterizes its effective practical application in the desulfurization process.

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Section: Introductionmentioning

confidence: 99%

Thermodynamic Characteristics of the Hydrogen Sulfide Sorption Process by Ferromanganese Materials

et al. 2022

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“…Reducing the ecological impact on the environment caused by metallurgical enterprises is possible by involving unrefined ferromanganese ores in the technological cycle. Providing high sorption characteristics comparable to the properties of synthesized sorbents based on manganese oxide [8], ferromanganese ores can be used in the process of sulfur-containing gas clearing.…”

Section: Introductionmentioning

confidence: 99%

Kinetic Features of the Hydrogen Sulfide Sorption on the Ferro-Manganese Material

Cheremisina¹,

Черемисина

Ponomareva

et al. 2021

Metals

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The kinetics of hydrogen sulfide sorption by the surface of a ferromanganese material containing in its composition a mixture of iron (II) and (III) oxides FeO × Fe2O3, takanelite (Mn, Ca) Mn4O9 × 3H2O and quartz SiO2, and which is samples of unrefined ferromanganese ore, was studied in this work. Sorption rate constant and activation energy constant values were calculated. The catalytic effect of iron (III) oxide was established, the presence of which in natural material contributes to a decrease in the H2S sorption activation energy. Based on the results of X-ray phase and chromatographic analysis methods, a chemical (redox) reaction of the conversion of hydrogen sulfide into elemental sulfur and H2O was revealed. The overall process rate is expressed in terms of the physical sorption stage and chemical transformation of the components; the influence of the rate of the third stage—reaction products desorption—on the overall rate of the process is taken into account. The limiting stage of the process is determined—a chemical reaction. The relation between the heat and the activation energy of the chemical transformation is used according to the Bronsted—Polanyi rule for catalytic processes. It was found that with an increase in the chemisorption heat, the activation energy of the chemisorption stage decreases and, as a consequence, its rate increases. The sorption process parameters were calculated—the Fe2O3 coverage degree with the initial substances and reaction products providing the maximum sorption rate, which can be a criterion for evaluating the catalytically active sites of the catalyst surface for carrying out catalytic reactions.

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About the interchangeability of iron-manganese nodules of the Pacific and the Baltic Sea

Cited by 2 publications

References 6 publications

Thermodynamic Characteristics of the Hydrogen Sulfide Sorption Process by Ferromanganese Materials

Thermodynamic Characteristics of the Hydrogen Sulfide Sorption Process by Ferromanganese Materials

Kinetic Features of the Hydrogen Sulfide Sorption on the Ferro-Manganese Material

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