Kinetics of pyrite multi-step thermal decomposition in refractory gold sulphide concentrates

Ruan, Shufeng; Wang, Chengyan; Xiao, Jie; Yin, Fang; Zhang, Yonglu; Yao, Zhichao; Chen, Yongqiang

doi:10.1007/s10973-021-10761-y

Cited by 10 publications

(5 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Where the last two are the processes described by equations ( 28) and (41). The composition of the gas phase in the considered temperature range is determined by the reaction…”

Section: Resultsmentioning

confidence: 99%

“…According to the literature data, the effective activation energy of the processes accompanying the oxidation (when heated in air) of iron, copper, and zinc sulfides, as well as their natural and artificial mixtures of various sizes (from -0.043 to -12 mm), can be of 7-463 kJ•mol -1 [11,14,19,26,27,40,41,53,60,67,69,72,82,85]; the estimates obtained in this work (E r j = 124-455 kJ•mol -1 ) do not go beyond this range. The results of determining the reaction model show that the limiting step of all elementary oxidation reactions of the studied ore is nucleation and crystal growth.…”

Section: Resultsmentioning

confidence: 99%

“…The results of determining the reaction model show that the limiting step of all elementary oxidation reactions of the studied ore is nucleation and crystal growth. The examples of the application of the JMAEK model to describe the mechanism of oxidation of sulfides (in particular, chalcopyrite and pyrite concentrates) should be mentioned [41,67,88]. The values of the Avrami exponent (n r j) obtained in this work are in the range from 1 to 1.7, which allows us to draw the following conclusions regarding the details of the mechanism and morphological features of the process: i) crystallization of the products of elementary reactions is accompanied by an increase in the number of nuclei;…”

Section: Resultsmentioning

confidence: 99%

“…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%

See 3 more Smart Citations

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

2023

View full text Add to dashboard Cite

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.

show abstract

“…Where the last two are the processes described by equations ( 28) and (41). The composition of the gas phase in the considered temperature range is determined by the reaction…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

2023

View full text Add to dashboard Cite

show abstract

“…The activation energies of pyrite in the two decomposition steps were 297.86 kJ/mol and 249.30 kJ/mol. In addition, the relationship between kinetic parameters and temperature was determined [12]. Yang and others analyzed the thermal behaviors and apparent activation energies of sulfide ore samples at different heating rates before and after pre-oxidation.…”

Section: Introductionmentioning

confidence: 99%

Kinetic Analysis of Thermal Decomposition Process of Emulsion Explosive Matrix in the Presence of Sulfide Ores

et al. 2022

View full text Add to dashboard Cite

This study aims to characterize the whole reaction process of (i) emulsion explosive matrix and sulfide ores, and (ii) ammonium nitrate and pyrite by the thermodynamics analysis method. A series of experiments were carried out at atmospheric pressure from 25 °C to 350 °C at four heating rates (3, 5, 10, and 15 K/min) and the Coats–Redfern method was applied to calculate the apparent activation energy of samples at different heating rates. The results show that the thermogravimetric (TG) curve of sulfide ores and emulsion explosive matrix can be divided into four stages: the water evaporation stage, the dynamic balance stage, the thermal decomposition stage, and the extinguishment stage. However, the thermal decomposition process of ammonium nitrate and pyrite can be divided into the dynamic balance stage, the thermal decomposition stage, and the burnout stage. The ignition temperature (T0) and maximum peak temperature (Tm) of the samples increased with the heating rate, but the shape of the TG/DTG (Derivative Thermogravimetric) curve was not affected. The results show that the reaction process of sulfide ores and emulsion explosive matrix is similar to the reaction process of pyrite and ammonium nitrate. The thermal stability of emulsion explosive matrix decreases when sulfide ores are added. By contrast, when pyrite is added, the thermal stability of the ammonium nitrate decreases more significantly.

show abstract

Thermal roasting behavior and kinetics of African cobalt-rich copper sulfide ore in air atmosphere

Yang

Liu

et al. 2022

J Therm Anal Calorim

View full text Add to dashboard Cite

Kinetics of pyrite multi-step thermal decomposition in refractory gold sulphide concentrates

Cited by 10 publications

References 44 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

Kinetic Analysis of Thermal Decomposition Process of Emulsion Explosive Matrix in the Presence of Sulfide Ores

Thermal roasting behavior and kinetics of African cobalt-rich copper sulfide ore in air atmosphere

Contact Info

Product

Resources

About