Thermal Dissociation of Pyrite During Processing of Pyrite-Containing Raw Materials

Luganov, V. A.; Shabalin, V. I.

doi:10.1179/cmq.1994.33.3.169

Cited by 7 publications

(3 citation statements)

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“…An important aspect of the technology is the intensity of oxidative roasting of the copper ore, which determines the specific productivity of the fluidized bed furnace and temperature and duration of the process; for its evaluation, information on the chemistry, kinetics, and mechanism of roasting is needed. A lot of publications are devoted to these questions in relation to copper-nickel ores [14], copper [15][16][17][18][19][20][21][22][23][24][25][26][27], zinc [17,28,29], nickel [30,31], and copper-cobalt [32] concentrates, as well as individual sulfide minerals which are part of them: pyrite [33][34][35][36][37][38][39][40][41][42][43][44][45][46], marcasite [47], mackinawite [48], pyrrhotite [34,36,39,[49][50][51][52][53][54], chalcopyrite [36,47,…”

Section: Introductionmentioning

confidence: 99%

Kinetics of solid-state oxidation of iron, copper and zinc sulfide mixture

2023

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The kinetics of solid-state oxidation by air of iron, copper and zinc sulfide natural mixture, which is typical of the pyritic copper ores, is investigated. Using the high-temperature X-ray powder diffraction, thermogravimetry and differential scanning calorimetry, it was found that the process can be represented by five exothermic elementary reactions, corresponding to intensive burning of iron, copper and zinc sulfides, and two endothermic ones, associated with decomposition of copper and iron sulfates. Kinetic analysis is performed by Kissinger and Augis–Bennett methods, the model-free function mechanism was determined from y(α) master plots and iterative optimization of the kinetic parameters. The limiting steps of these reactions are nucleation and crystal growth, and the values of activation energy, pre-exponential factor and Avrami exponent are in the ranges of 140–459 kJ·mol–1, 1.41·104–3.49·1031 s–1, and 1.0–1.7, respectively. Crystallization is followed by an increase in the number of nuclei, which may be formed both at the interface and in the bulk of the ore particles, and crystal growth is one-dimensional and controlled by a chemical reaction at the phase boundary or diffusion. The results of the work can contribute to the development of theoretical ideas about the physicochemical transformations of pyritic ores and concentrates during pyrometallurgical operations.

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Section: Introductionmentioning

confidence: 99%

Kinetics of solid-state oxidation of iron, copper and zinc sulfide mixture

2023

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“…Так, сульфидные (колчеданные) медные руды ряда месторождений Урала отличаются повышенным (до 0,2 мас.%) содержанием кобальта, изоморфно замещающего железо в составе пирита [1,2]. Такие руды перерабатывают по традиционной технологии, включающей флотационное обогащение с получением селективных медных концентратов, направляемых на пиро-или гидрометаллургические переделы [3][4][5]. При этом до 90 % кобальта переходит в пиритные хвосты обогащения [6], рациональных путей утилизации которых до сих пор не найдено.…”

Section: Introductionunclassified

Optimization of converting process for matte of oxidized nickel ores and sulfide copper ores joint smelting based on thermodynamic simulation

Klyushnikov

Maltsev

2022

Izv.VUZ. Tsvet. Met.

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The paper presents the results obtained in the thermodynamic modeling of converting copper-nickel matte (11.3 wt.% Ni + Cu + + Co, 61.5 wt.% Fe, 25.9 wt.% S) produced by joint smelting of oxidized nickel ore and sulfide copper ore. Calculations were made in the approximation of ideal molecular solutions using the HSC Chemistry software package (Outotec Research Oy, Finland). The possibility of low-iron matte, converter slag and gas phase separation was shown. Estimated conditional equilibrium constants of exchange reactions between low-iron matte and slag (KNi/Fe = 0.004÷0.005, KCo/Fe = 0.056÷0.099) are close to ideal values. Statistical data processing was carried out using the mathematical experiment planning method. The converting temperature (t = 1100÷1300 °C) and iron and sulfur oxidation completeness level (q = 0.9÷1.0) determining the air and flux (SiO2) consumption were chosen as the factors to study. Obtained mathematical models of the process were used for its optimization. It was shown that the best converting performance can be achieved at t = 1150 °С and q = 0.950 when the low-iron matte contains 70.7 wt.% Ni + Cu + Co. At a yield of 8.74 % of the charge mass, the nickel, copper and cobalt recovery rates are 67.9, 97.9 and 9.1 %, respectively. The supposed air consumption (145.1 m3 (under normal conditions) per 100 kg of matte) and SiO2 (34.4 kg per 100 kg of matte) as well as slag yield (89.1 % of the charge mass) are close to working regime parameters. The results of the study confirm the possibility of cost-effective processing of poor copper-nickel matte and after experimental verification they can be used to develop automation flowcharts for converter departments at existing and designed production facilities.

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“…Iron (III) oxide is one of the ingredients of clay. Thermal transformations of iron bearing materials from minerals in oxidizing atmosphere are processes investigated in various fields of chemistry, mineralogy and materials science: goethite [1][2][3][4][5][6][7], akaganeite [8], lepidocrocite [9][10], siderite [11], pyrite [12][13][14][15][16], pyrrhotite [15][16][17], almandine [18], biotite [19][20], phlogopite [20], vermiculite [20], illite [21], or ilmenite [22][23]. The common point of these processes is formation of different iron oxides during conversion and/or oxidation of products.…”

Section: Introductionmentioning

confidence: 99%

Iron (III) oxide fabrication from natural clay with reference to phase transformation γ- → α-Fe2O3

Šaponjić¹,

Saponjic²,

Nikolić³

et al. 2017

SCI SINTER

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Amorphous iron (III) oxide was obtained from clay, using ammonium hydroxide as a precipitating agent. Influence of freeze drying under vacuum, as a drying method, on particle size, chemical composition, and crystallinity of obtained iron (III) oxide powder was investigated. After freeze drying, precipitate was annealed in air at 500 o C and 900 o C. X-ray diffraction, particle size analysis, scanning electron microscopy, energy dispersive spectrometry, Fourier transform infrared spectroscopy, thermogravimetric and differential thermal analysis were used to characterize obtained iron (III) oxide powder. All of three powders obtained by freeze drying and annealing, have low crystallinity and particles with irregular layered shape. Narrow particle size distribution was given by an average diameter value of around 50 μm for all observed powders. Iron-bearing materials like α-Fe 2 O 3 and γ-Fe 2 O 3 are obtained. Differential thermal analysis curve of obtained samples showed endothermic reaction at 620 o C which could be ascribed to phase transition from cubic form γ-→ α-Fe 2 O 3. Thermal transformations of iron (III) oxide, obtained from clay as a natural source, is suitable to explore in the framework of materials chemistry, and opens the possibility to synthesize materials based on Fe 2 O 3 with specific magnetic behavior.

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Thermal Dissociation of Pyrite During Processing of Pyrite-Containing Raw Materials

Cited by 7 publications

References 6 publications

Kinetics of solid-state oxidation of iron, copper and zinc sulfide mixture

Kinetics of solid-state oxidation of iron, copper and zinc sulfide mixture

Optimization of converting process for matte of oxidized nickel ores and sulfide copper ores joint smelting based on thermodynamic simulation

Iron (III) oxide fabrication from natural clay with reference to phase transformation γ- → α-Fe2O3

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