Kinetics and mechanism of As2S2 oxidation

Mihajlović, Ivan; Strbac, D Nada; Živkovič, Dragana; Ilic, Boris

doi:10.2298/jsc0506869m

Cited by 16 publications

(4 citation statements)

References 2 publications

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“…Subsequently, in order to verify this reaction, the HSC Chemistry software [14] was used to obtain the equilibrium constants of possible reactions for the thermal decomposition of As 2 S 5 , generating Table 4, where a behavior similar to that obtained experimentally by means of the thermal decomposition tests and SEM-EDS analysis was verified. However, the HSC Chemistry software [14] neither presents information for the As 4 S 6 (g) dyad, formed from As 2 S 3 (g), nor for the As 3 S 4 phase found, corroborating what was stated by Mihajlović et al [15], who propose the lack of kinetic information regarding the behavior of arsenic sulfides. This is due to the fact that As-S systems are complex to describe since arsenic compounds have a low melting temperature [16,17].…”

supporting

confidence: 54%

Study of the Reaction Mechanisms during the Thermal Decomposition of Arsenic Sulfide (V) at High Temperatures under Non-Isothermal Conditions

Castro

Balladares²,

Jerez³

et al. 2022

Minerals

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The reaction mechanisms during thermal decomposition in As-S systems are complex to describe due to the physicochemical characteristics of arsenic and its sulfides. Non-isothermal tests were carried out in a NETZSCH DTA/TG thermal analysis equipment, and interrupted tests were carried out in a vertical oven adapted for this purpose; both tests were carried out in an inert nitrogen atmosphere. The information obtained experimentally was analyzed and correlated to determine the phases and reaction mechanisms during the thermal decomposition of an arsenic sulfide (V) sample. As a result of this study, the mechanism of thermal decomposition of an arsenic sulfide sample was obtained and the apparent activation energy was determined by the Kissinger and Ozawa methods.

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supporting

confidence: 54%

Study of the Reaction Mechanisms during the Thermal Decomposition of Arsenic Sulfide (V) at High Temperatures under Non-Isothermal Conditions

Castro

Balladares²,

Jerez³

et al. 2022

Minerals

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“…In 2005, Mihajlović et al [52] studied the isothermal and non-isothermal oxidation kinetics of As 2 S 2 , with the aim of determining the kinetic parameters and oxidation mechanisms. For this purpose, they performed experimental tests of thermal analysis, they used a synthesized sample of As 2 S 2 from Paisy Hilendarsky Plovdiv University (Bulgaria) with the following composition, 67.22% As and 32.78% S; the phases were identified by XRD.…”

Section: Arsenic Sulfidesmentioning

confidence: 99%

Behavior of As/AsxSy in Neutral and Oxidizing Atmospheres at High Temperatures—An Overview

Castro

Balladares

Jerez

et al. 2022

Metals

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The reaction mechanisms in As and As-S systems during their oxidation and/or thermal decomposition are complex to describe due to the physicochemical characteristics of arsenic and its sulfides; the information highlighted in the literature was analyzed and correlated to determinate the predominant phases and reaction mechanisms during the thermal decomposition and oxidation of arsenic, in its elemental form and in sulfurate phases. As a result of this analysis, it was determined that the predominant phases are mainly composed of allotropies of arsenic, sulfides, and dimers. In addition, reaction mechanisms are provided that describe the behavior of arsenic and its sulfides during its thermal decomposition and oxidation.

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“…Choosing the appropriate kinetic model for each composition of bauxite investigated in this paper was done using Sharp's method of reduced half time of reaction [11]. This model is widely accepted and used by different authors [12][13][14][15][16].…”

Section: Modelling Processmentioning

confidence: 99%

“…Adequate kinetic functions selected for linearization of the experimental results for the processes of different bauxite type leaching, using the Sharp method[15] …”

mentioning

confidence: 99%

Kinetic Modelling of Different Bauxite Types in the Bayer Leaching Process

Djurić¹,

Mihajlović²,

Živković³

2010

Canadian Metallurgical Quarterly

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The dissolution of aluminum hydroxides from bauxite ores constitutes a key process in the aluminum industry. Generally, aluminum minerals in bauxites are present in the form of gibbsite, boehmite or diaspore. Usually, these mineral forms are mixed in bauxite as a boehmite-diaspore or a gibbsite-boehmite mixture with different weight ratios. The Al 2 O 3 recovery, as well as the kinetic parameters, during the Bayer leaching process of different bauxite types strongly depends on their mineralogical composition. In this paper an attempt was made to develop a mathematical model which enables calculation of the Al 2 O 3 recovery from boehmite-diaspore or gibbsite-boehmite bauxite based on kinetic parameters available for leaching the "pure" bauxite types (containing only diaspore, boehmite or gibbsite as the main alumina bearing mineral form) and the mineral composition of the bauxite mixture.Résumé -La dissolution des hydroxydes d'aluminium à partir de minéraux de bauxite constitue un procédé clé de l'industrie de l'aluminium. Généralement, les minéraux d'aluminium dans la bauxite sont présents sous forme d'hydrargillite, de boehmite ou de diaspore. Habituellement, ces formes minérales sont mélangées dans la bauxite en un mélange de boehmite-diaspore ou d'hydrargillite-boehmite, avec différents ratios en poids. La récupération de l'Al 2 O 3 , ainsi que les paramètres de la cinétique lors du procédé de lixiviation de Bayer de différents types de bauxite, dépend fortement de leur composition minéralogique. Dans ce document, on a essayé de développer le modèle mathématique qui rend possible le calcul de la récupération de l'Al 2 O 3 à partir de bauxite de boehmite-diaspore ou d'hydrargilliteboehmite, basé sur les paramètres cinétiques disponibles pour la lixiviation des types "purs" de bauxite (contenant seulement du diaspore, de la boehmite ou de l'hydrargillite comme forme minérale principale porteuse d'alumine) et sur la composition minérale de la bauxite mélangée.

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Kinetics and mechanism of As2S2 oxidation

Cited by 16 publications

References 2 publications

Study of the Reaction Mechanisms during the Thermal Decomposition of Arsenic Sulfide (V) at High Temperatures under Non-Isothermal Conditions

Study of the Reaction Mechanisms during the Thermal Decomposition of Arsenic Sulfide (V) at High Temperatures under Non-Isothermal Conditions

Behavior of As/AsxSy in Neutral and Oxidizing Atmospheres at High Temperatures—An Overview

Kinetic Modelling of Different Bauxite Types in the Bayer Leaching Process

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