Environmental technologies in the production of metallurgical silicon

Glazev, M.; Bazhin, V. Yu.

doi:10.1201/9781003017226-17

Cited by 5 publications

(5 citation statements)

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“…Technological processes associated with the processing of minerals, in particular, apatite-nepheline raw materials, as well as metallurgical and chemical production, lead to the formation of large amounts of waste, which is an environmental problem of mineral complexes. One of the significant problems is the emission of process gases into the atmosphere containing toxic substances, including sulfur-containing compounds. − …”

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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“…The emission of waste gases containing toxic substances, including sulfur-containing compounds, is a serious environmental problem of the metallurgical industry [1][2][3][4][5][6]. Sorption methods are still effective in the field of the air environment cleaning process.…”

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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“…To improve the properties of the cementing slurry, a microsilica additive was proposed. friendliness of the use of silicon production waste [3,9,10]; the experience of using microsilica additives from silicon production waste in concrete and construction technologies [11,12,13]. There are also works about possibilities and prospects for producing silumin with different silicon content using amorphous microsilica [14]; modification of fine-grained polymer concrete with microsilica [15]; high-performance concretes with modifying micro additives of microsilica and diopside [16]; development of cracking patterns in modified cement matrix with microsilica [17]; and the possibility of preparing alloys of the al-si system using amorphous microsilica [18].…”

Section: Introductionmentioning

confidence: 99%

On the recycling and use of microsilica in the oil industry

Glazev

Bazhin

2021

E3S Web Conf.

Self Cite

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Cementing of casing strings is one of the most important processes of well construction for the exploration and exploitation of oil, gas and gas condensate fields. Despite more than half a century of research and development of grouting mortars, they are not able to provide high strength and good adhesion to the casing string. The article considers the possibility of using microsilica (waste of silicon production) in the oil industry, as an additive of a plugging solution to increase the strength, expansion valve, and reduce the permeability of the plugging stone.

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Environmental technologies in the production of metallurgical silicon

Cited by 5 publications

References 1 publication

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

On the recycling and use of microsilica in the oil industry

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