TY  - CONF
AU  - Manojlović, Vaso
AU  - Kamberović, Željko
AU  - Jevtić, Sanja O.
AU  - Gajić, Nataša
AU  - Ranitović, Milisav
AU  - Milošević, Anđela
AU  - Đokić, Jovana
PY  - 2021
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/6297
AB  - In the hydrometallurgical process for getting the zine, after acid leaching, zinc-ferric sludge as the byproduct is further treated in the so-called jarosite procedure In the jarosite procedure, Pb and Ag are valorized, and Fe is removed through the residue. Besides Fe, in the jarosite residue, the other impurities are present (2n. Cu Ni, Cr, Co, As, Cd, Pb, 5b, Ge, Ga, In) which could be mobile in the environment causing the hazardous consequences [11]. The main goal of our research is to determine the activation energy of the decomposition of jarosite using thermogravimetry analysis. The thermogravimetric curve (IG) shows three segments, which indicate that the degradation of jarosite occurs in three steps. Below 200 °C, mass loss is 1.1%, due to adsorbed water evaporation. At an interval of 285-440 °C (with DTG maximum at 418 °C) deammonicifiation and dehydroxylation occurred. Also, structural water is released above 390 °C, so that three reactions occur simultaneously in this temperature range - which justifies the high activation energy on a - 0.3 and temperature of 420 °C (Figure b, c). Jarosite decomposed into ferrous sulfate and hematite with a weight loss of 22.6%. The mass loss in the range 520 to 750 °C (DTG maximum at 625 °C) is attributed to the loss of sulfate as $Oz. Two minima (420.1 and 625.9 °C) are observed on the DSC curve, which indicates that the process of jarosite decomposition is endothermic. The Fell could oxidize from intermediate phases, which is favorable to get Fe(ILD) that will later precipitate in the water. For kinetic analysis, we used Kissinger-Akahira Sunose (KAS) integral isoconversional method for the determination of Ea. The energy of activation changes with conversion, a, and the average value is 235.4 kJ/mol - which is higher than the literature 197.7 kJ/mol [2]; this is expected due to the complexity in the chemical composition of industrial jarosite residue.
PB  - Kosovska Mitrovica : Fakultet tehničkih nauka
C3  - Deseti simpozijum o termodinamici i faznim dijagramima
T1  - Isoconversional analysis of jarosite residue thermal decomposition
UR  - https://hdl.handle.net/21.15107/rcub_cherry_6297
ER  - 

@conference{
author = "Manojlović, Vaso and Kamberović, Željko and Jevtić, Sanja O. and Gajić, Nataša and Ranitović, Milisav and Milošević, Anđela and Đokić, Jovana",
year = "2021",
abstract = "In the hydrometallurgical process for getting the zine, after acid leaching, zinc-ferric sludge as the byproduct is further treated in the so-called jarosite procedure In the jarosite procedure, Pb and Ag are valorized, and Fe is removed through the residue. Besides Fe, in the jarosite residue, the other impurities are present (2n. Cu Ni, Cr, Co, As, Cd, Pb, 5b, Ge, Ga, In) which could be mobile in the environment causing the hazardous consequences [11]. The main goal of our research is to determine the activation energy of the decomposition of jarosite using thermogravimetry analysis. The thermogravimetric curve (IG) shows three segments, which indicate that the degradation of jarosite occurs in three steps. Below 200 °C, mass loss is 1.1%, due to adsorbed water evaporation. At an interval of 285-440 °C (with DTG maximum at 418 °C) deammonicifiation and dehydroxylation occurred. Also, structural water is released above 390 °C, so that three reactions occur simultaneously in this temperature range - which justifies the high activation energy on a - 0.3 and temperature of 420 °C (Figure b, c). Jarosite decomposed into ferrous sulfate and hematite with a weight loss of 22.6%. The mass loss in the range 520 to 750 °C (DTG maximum at 625 °C) is attributed to the loss of sulfate as $Oz. Two minima (420.1 and 625.9 °C) are observed on the DSC curve, which indicates that the process of jarosite decomposition is endothermic. The Fell could oxidize from intermediate phases, which is favorable to get Fe(ILD) that will later precipitate in the water. For kinetic analysis, we used Kissinger-Akahira Sunose (KAS) integral isoconversional method for the determination of Ea. The energy of activation changes with conversion, a, and the average value is 235.4 kJ/mol - which is higher than the literature 197.7 kJ/mol [2]; this is expected due to the complexity in the chemical composition of industrial jarosite residue.",
publisher = "Kosovska Mitrovica : Fakultet tehničkih nauka",
journal = "Deseti simpozijum o termodinamici i faznim dijagramima",
title = "Isoconversional analysis of jarosite residue thermal decomposition",
url = "https://hdl.handle.net/21.15107/rcub_cherry_6297"
}

Manojlović, V., Kamberović, Ž., Jevtić, S. O., Gajić, N., Ranitović, M., Milošević, A.,& Đokić, J.. (2021). Isoconversional analysis of jarosite residue thermal decomposition. in Deseti simpozijum o termodinamici i faznim dijagramima
Kosovska Mitrovica : Fakultet tehničkih nauka..
https://hdl.handle.net/21.15107/rcub_cherry_6297

Manojlović V, Kamberović Ž, Jevtić SO, Gajić N, Ranitović M, Milošević A, Đokić J. Isoconversional analysis of jarosite residue thermal decomposition. in Deseti simpozijum o termodinamici i faznim dijagramima. 2021;.
https://hdl.handle.net/21.15107/rcub_cherry_6297 .

Manojlović, Vaso, Kamberović, Željko, Jevtić, Sanja O., Gajić, Nataša, Ranitović, Milisav, Milošević, Anđela, Đokić, Jovana, "Isoconversional analysis of jarosite residue thermal decomposition" in Deseti simpozijum o termodinamici i faznim dijagramima (2021),
https://hdl.handle.net/21.15107/rcub_cherry_6297 .

TY  - CONF
AU  - Gajić, Nataša
AU  - Kamberović, Željko
AU  - Ranitović, Milisav
AU  - Milošević, Anđela
AU  - Manojlović, Vaso
AU  - Jevtić, Sanja O.
AU  - Đokić, Jovana
PY  - 2021
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/6296
AB  - Jarosite waste is classified as hazardous one. It contains toxic elements (Cd, As, Hg) with strong leaching toxicity and metal mobility. Nevertheless, jarosite waste is usually landfilled which have an adverse impact on the environment and human health. In addition, jarosite waste contains significant amounts of the base (Fe, Zn, Pb. Cu), critical (In, Ge, Ga), and precious metals (Au, Ag) which should not be discarded but recovered [1]. This paper presents thermodynamic modelling of roasting of non-standard Pb/Ag Jarosite. This approach enables the determination of optimal process conditions for product formation with required phase composition, and thus valorizations of valuable metals. Thermodynamic data for the detailed analysis of roasting were calculated using HSC Chemistry Software v. 9.9.2.3 [2]. The main objectives were the determination of the temperature effect and ratio of input material vs. sulphating and oxidizing agent on the formation of the required roasting product phase composition. To determine the stability of the roasting product compounds, modelling of the phase stability diagrams was done.
The change of the standard Gibbs free energy (ΔrG°) versus the temperature of analyzed transformation reactions the examined system suggests thermodynamical possibility at a temperature higher than 700 °C. Also, the results of thermodynamic calculations, within the equilibrium composition model, showed that the maximum content of hematite, and metal sulphates (Cu, Pb and Zn), as required product compounds, can be obtained within the temperature range of 700-750 °C. Phase stability modelling confirmed formation of the mentioned phases When logarithmic partial pressure of oxygen and sulphur is - 4.5 bar and -20.0 bar, respectively.
PB  - Kosovska Mitrovica : Fakultet tehničkih nauka
C3  - Deseti simpozijum o termodinamici i faznim dijagramima
T1  - Thermodynamic modelling of the roasting process of the nonstandard Pb/Ag Jarosite
UR  - https://hdl.handle.net/21.15107/rcub_cherry_6296
ER  - 

@conference{
author = "Gajić, Nataša and Kamberović, Željko and Ranitović, Milisav and Milošević, Anđela and Manojlović, Vaso and Jevtić, Sanja O. and Đokić, Jovana",
year = "2021",
abstract = "Jarosite waste is classified as hazardous one. It contains toxic elements (Cd, As, Hg) with strong leaching toxicity and metal mobility. Nevertheless, jarosite waste is usually landfilled which have an adverse impact on the environment and human health. In addition, jarosite waste contains significant amounts of the base (Fe, Zn, Pb. Cu), critical (In, Ge, Ga), and precious metals (Au, Ag) which should not be discarded but recovered [1]. This paper presents thermodynamic modelling of roasting of non-standard Pb/Ag Jarosite. This approach enables the determination of optimal process conditions for product formation with required phase composition, and thus valorizations of valuable metals. Thermodynamic data for the detailed analysis of roasting were calculated using HSC Chemistry Software v. 9.9.2.3 [2]. The main objectives were the determination of the temperature effect and ratio of input material vs. sulphating and oxidizing agent on the formation of the required roasting product phase composition. To determine the stability of the roasting product compounds, modelling of the phase stability diagrams was done.
The change of the standard Gibbs free energy (ΔrG°) versus the temperature of analyzed transformation reactions the examined system suggests thermodynamical possibility at a temperature higher than 700 °C. Also, the results of thermodynamic calculations, within the equilibrium composition model, showed that the maximum content of hematite, and metal sulphates (Cu, Pb and Zn), as required product compounds, can be obtained within the temperature range of 700-750 °C. Phase stability modelling confirmed formation of the mentioned phases When logarithmic partial pressure of oxygen and sulphur is - 4.5 bar and -20.0 bar, respectively.",
publisher = "Kosovska Mitrovica : Fakultet tehničkih nauka",
journal = "Deseti simpozijum o termodinamici i faznim dijagramima",
title = "Thermodynamic modelling of the roasting process of the nonstandard Pb/Ag Jarosite",
url = "https://hdl.handle.net/21.15107/rcub_cherry_6296"
}

Gajić, N., Kamberović, Ž., Ranitović, M., Milošević, A., Manojlović, V., Jevtić, S. O.,& Đokić, J.. (2021). Thermodynamic modelling of the roasting process of the nonstandard Pb/Ag Jarosite. in Deseti simpozijum o termodinamici i faznim dijagramima
Kosovska Mitrovica : Fakultet tehničkih nauka..
https://hdl.handle.net/21.15107/rcub_cherry_6296

Gajić N, Kamberović Ž, Ranitović M, Milošević A, Manojlović V, Jevtić SO, Đokić J. Thermodynamic modelling of the roasting process of the nonstandard Pb/Ag Jarosite. in Deseti simpozijum o termodinamici i faznim dijagramima. 2021;.
https://hdl.handle.net/21.15107/rcub_cherry_6296 .

Gajić, Nataša, Kamberović, Željko, Ranitović, Milisav, Milošević, Anđela, Manojlović, Vaso, Jevtić, Sanja O., Đokić, Jovana, "Thermodynamic modelling of the roasting process of the nonstandard Pb/Ag Jarosite" in Deseti simpozijum o termodinamici i faznim dijagramima (2021),
https://hdl.handle.net/21.15107/rcub_cherry_6296 .

TY  - CONF
AU  - Milošević, Anđela
AU  - Kamberović, Željko
AU  - Manojlović, Vaso
AU  - Đokić, Jovana
AU  - Gajić, Nataša
PY  - 2021
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5367
AB  - Given the constant development of the high-tech industry, consumer-oriented societies, and reduced electronic equipment's lifespan, the outcome of growth and accumulation of waste is inevitable. Yet, specific electronic equipment components, such as central processing unit (CPU), are carriers of valuable metals, primarily precious, so waste electronic equipment become of recyclable interest. However, inadequate technological processing, particularly in the informal recycling sectors, leads to valuable metals losses. This approach has a negative economic and environmental impact: valuable material is usually considered as waste and landfilled with metals trapped in it, while due to increasing demand, metals are being exploited from natural resources.
In this sense, there is an unquestionable need for an innovative recycling approach and adequate waste management that would lead to i) the decrease of natural exploitation, ii) the removal of waste accumulated in the environment, and iii) better utilization of material flows.
The aim of this paper is an evaluation of the potential of waste CPU acid leaching residue as secondary material and the proposal of the innovative design of an adequate technological process for CPU recycling and recovery of valuable metals while minimizing their loss. The first part of the study included the characterization of the CPU acid leaching residue. Results of the research point out that precious metals content is significant, and material could be further exploited as secondary raw material. However, further optimization of process parameters is needed to achieve the most efficient valorization. A conceptual proposal of the technological scheme for metal recovery is given in the second part, considering two approaches: hydro- and pyrometallurgical methods.
An innovative approach for recycling and waste management can contribute to the ultimate goal nowadays globally set as an imperative: achieving a circular economy through improved material flows management.
PB  - Novi Sad : Faculty of Technical Sciences
C3  - First Scientific Conference with International Participation, Circular Economy and Environmental Labelling, CEEL 2021, Book of Abstracts, Novi Sad, 29th January 2021
T1  - Characterization of waste computers processors and proposal of the metals valorization process
SP  - 5
EP  - 6
UR  - https://hdl.handle.net/21.15107/rcub_cherry_5367
ER  - 

@conference{
author = "Milošević, Anđela and Kamberović, Željko and Manojlović, Vaso and Đokić, Jovana and Gajić, Nataša",
year = "2021",
abstract = "Given the constant development of the high-tech industry, consumer-oriented societies, and reduced electronic equipment's lifespan, the outcome of growth and accumulation of waste is inevitable. Yet, specific electronic equipment components, such as central processing unit (CPU), are carriers of valuable metals, primarily precious, so waste electronic equipment become of recyclable interest. However, inadequate technological processing, particularly in the informal recycling sectors, leads to valuable metals losses. This approach has a negative economic and environmental impact: valuable material is usually considered as waste and landfilled with metals trapped in it, while due to increasing demand, metals are being exploited from natural resources.
In this sense, there is an unquestionable need for an innovative recycling approach and adequate waste management that would lead to i) the decrease of natural exploitation, ii) the removal of waste accumulated in the environment, and iii) better utilization of material flows.
The aim of this paper is an evaluation of the potential of waste CPU acid leaching residue as secondary material and the proposal of the innovative design of an adequate technological process for CPU recycling and recovery of valuable metals while minimizing their loss. The first part of the study included the characterization of the CPU acid leaching residue. Results of the research point out that precious metals content is significant, and material could be further exploited as secondary raw material. However, further optimization of process parameters is needed to achieve the most efficient valorization. A conceptual proposal of the technological scheme for metal recovery is given in the second part, considering two approaches: hydro- and pyrometallurgical methods.
An innovative approach for recycling and waste management can contribute to the ultimate goal nowadays globally set as an imperative: achieving a circular economy through improved material flows management.",
publisher = "Novi Sad : Faculty of Technical Sciences",
journal = "First Scientific Conference with International Participation, Circular Economy and Environmental Labelling, CEEL 2021, Book of Abstracts, Novi Sad, 29th January 2021",
title = "Characterization of waste computers processors and proposal of the metals valorization process",
pages = "5-6",
url = "https://hdl.handle.net/21.15107/rcub_cherry_5367"
}

Milošević, A., Kamberović, Ž., Manojlović, V., Đokić, J.,& Gajić, N.. (2021). Characterization of waste computers processors and proposal of the metals valorization process. in First Scientific Conference with International Participation, Circular Economy and Environmental Labelling, CEEL 2021, Book of Abstracts, Novi Sad, 29th January 2021
Novi Sad : Faculty of Technical Sciences., 5-6.
https://hdl.handle.net/21.15107/rcub_cherry_5367

Milošević A, Kamberović Ž, Manojlović V, Đokić J, Gajić N. Characterization of waste computers processors and proposal of the metals valorization process. in First Scientific Conference with International Participation, Circular Economy and Environmental Labelling, CEEL 2021, Book of Abstracts, Novi Sad, 29th January 2021. 2021;:5-6.
https://hdl.handle.net/21.15107/rcub_cherry_5367 .

Milošević, Anđela, Kamberović, Željko, Manojlović, Vaso, Đokić, Jovana, Gajić, Nataša, "Characterization of waste computers processors and proposal of the metals valorization process" in First Scientific Conference with International Participation, Circular Economy and Environmental Labelling, CEEL 2021, Book of Abstracts, Novi Sad, 29th January 2021 (2021):5-6,
https://hdl.handle.net/21.15107/rcub_cherry_5367 .