Pub Date : 2024-12-28DOI: 10.1016/j.psep.2024.12.098
Jingjing Du, Xueting Zhang, Maosen Wang, Yan Su, Jing Shao, Yufan Zhang, Xia Cao, Baodan Jin, Yuanqian Xu, Lan Wang, Jianguo Zhao
Pyrite is regarded as a natural electron donor and can potentially enhance autotrophic nitrogen removal and electricity generation. However, few studies have been devoted to exploring the feasibility of pyrite in treating carbon-constraint wastewater by constructed wetland-microbial fuel cells (CW-MFCs). In this study, two CW-MFCs with pyrite as anodic filling materials were constructed to treat wastewater with low-carbon sources (e-PCW1) and without carbon sources (e-PCW2). In the e-PCW2, the removal efficiency of nitrogen and phosphorus was 11.44 %–15.79 % and 79.79 %–84.35 %, respectively. The e-PCW1 system removed up to 63.56 % nitrogen and 86.37 % phosphorus when the aeration rate and COD loading were 0.2 L/min and 180 mg/L, respectively. The best electricity generation was also obtained during this stage. The enhanced nitrogen removal in e-PCW1 was attributed to the higher abundance of Thauera, a denitrifying and sulfate-reducing bacterium, while phosphorus removal relied on chemical precipitation and the contributions of Candidatus_Competibacter and norank_o__Run-SP154. In conclusion, pyrite can play a significant role in enhancing pollutant removal efficiency and electricity generation of CW-MFCs, especially for treating carbon-constrained wastewater.
{"title":"Importance of natural pyrite in treating carbon-constraint wastewater by constructed wetland-microbial fuel cells","authors":"Jingjing Du, Xueting Zhang, Maosen Wang, Yan Su, Jing Shao, Yufan Zhang, Xia Cao, Baodan Jin, Yuanqian Xu, Lan Wang, Jianguo Zhao","doi":"10.1016/j.psep.2024.12.098","DOIUrl":"https://doi.org/10.1016/j.psep.2024.12.098","url":null,"abstract":"Pyrite is regarded as a natural electron donor and can potentially enhance autotrophic nitrogen removal and electricity generation. However, few studies have been devoted to exploring the feasibility of pyrite in treating carbon-constraint wastewater by constructed wetland-microbial fuel cells (CW-MFCs). In this study, two CW-MFCs with pyrite as anodic filling materials were constructed to treat wastewater with low-carbon sources (e-PCW1) and without carbon sources (e-PCW2). In the e-PCW2, the removal efficiency of nitrogen and phosphorus was 11.44 %–15.79 % and 79.79 %–84.35 %, respectively. The e-PCW1 system removed up to 63.56 % nitrogen and 86.37 % phosphorus when the aeration rate and COD loading were 0.2 L/min and 180 mg/L, respectively. The best electricity generation was also obtained during this stage. The enhanced nitrogen removal in e-PCW1 was attributed to the higher abundance of <ce:italic>Thauera</ce:italic>, a denitrifying and sulfate-reducing bacterium, while phosphorus removal relied on chemical precipitation and the contributions of <ce:italic>Candidatus_Competibacter</ce:italic> and <ce:italic>norank_o__Run-SP154</ce:italic>. In conclusion, pyrite can play a significant role in enhancing pollutant removal efficiency and electricity generation of CW-MFCs, especially for treating carbon-constrained wastewater.","PeriodicalId":20743,"journal":{"name":"Process Safety and Environmental Protection","volume":"67 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2024-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142967760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-28DOI: 10.1016/j.psep.2024.12.115
Yao Huang, Dingli Liu, Jiafu Tang, Shuai Niu, Fredric M. Bell, Feniosky Pena-Mora
In recent years, frequent fires and explosions have occurred at electric vehicle (EV) charging stations. Previous studies primarily focused on enhancing the resistance of charging facilities and batteries to such incidents. However, research on improving the spatial accessibility of external fire services for these stations remains limited. Notably, the accessibility of fire services varies significantly under different traffic conditions. To address this gap, this study built a dynamic evaluation method for assessing the spatial accessibility of fire services, incorporating real-time traffic data. This study identified 50 fire stations as fire service supply points and 856 charging stations as demand points in Changsha, China. By leveraging the web map's application programming interface (API) to extract traffic information, real-time travel time for fire services were calculated. Over seven consecutive days, 197 estimation scenarios and obtained 168,632 valid samples were established. The results reveal that the effective coverage rate of fire services for charging stations in Changsha is 15.88 %, indicating a need for improvement in spatial accessibility. The findings provide implications for the optimal allocation and scientific deployment of fire rescue resources.
{"title":"Dynamic estimation of the fire service spatial accessibility for EV charging stations: Towards preventing severe fires and explosions","authors":"Yao Huang, Dingli Liu, Jiafu Tang, Shuai Niu, Fredric M. Bell, Feniosky Pena-Mora","doi":"10.1016/j.psep.2024.12.115","DOIUrl":"https://doi.org/10.1016/j.psep.2024.12.115","url":null,"abstract":"In recent years, frequent fires and explosions have occurred at electric vehicle (EV) charging stations. Previous studies primarily focused on enhancing the resistance of charging facilities and batteries to such incidents. However, research on improving the spatial accessibility of external fire services for these stations remains limited. Notably, the accessibility of fire services varies significantly under different traffic conditions. To address this gap, this study built a dynamic evaluation method for assessing the spatial accessibility of fire services, incorporating real-time traffic data. This study identified 50 fire stations as fire service supply points and 856 charging stations as demand points in Changsha, China. By leveraging the web map's application programming interface (API) to extract traffic information, real-time travel time for fire services were calculated. Over seven consecutive days, 197 estimation scenarios and obtained 168,632 valid samples were established. The results reveal that the effective coverage rate of fire services for charging stations in Changsha is 15.88 %, indicating a need for improvement in spatial accessibility. The findings provide implications for the optimal allocation and scientific deployment of fire rescue resources.","PeriodicalId":20743,"journal":{"name":"Process Safety and Environmental Protection","volume":"9 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2024-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142967758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-28DOI: 10.1016/j.psep.2024.12.112
Yunlong Ma, Tao Fan, Qi Zhang
Emergency leakage sealing plays a crucial role in accident control. This study proposes a novel emergency sealing method for pipeline leaks based on magnetorheological adhesive. A full-scale leakage simulation experiment was conducted on the DN350 pipeline, and the online sealing pressure could reach 1.5 MPa. After repair, the pressure-bearing capacity could be further improved. In addition, the quantitative relationship between leakage conditions and plugging parameters was studied by finite element simulation, the magnetic force can be increased by 2.0–6.3 times by adding the magnetorheological adhesive. The sealing mechanism was explained from the perspective of magnetic field, flow field, and stress changes.
{"title":"Experimental and numerical simulation of a novel on-line leak sealing technology based on magnetorheological adhesive","authors":"Yunlong Ma, Tao Fan, Qi Zhang","doi":"10.1016/j.psep.2024.12.112","DOIUrl":"https://doi.org/10.1016/j.psep.2024.12.112","url":null,"abstract":"Emergency leakage sealing plays a crucial role in accident control. This study proposes a novel emergency sealing method for pipeline leaks based on magnetorheological adhesive. A full-scale leakage simulation experiment was conducted on the DN350 pipeline, and the online sealing pressure could reach 1.5 MPa. After repair, the pressure-bearing capacity could be further improved. In addition, the quantitative relationship between leakage conditions and plugging parameters was studied by finite element simulation, the magnetic force can be increased by 2.0–6.3 times by adding the magnetorheological adhesive. The sealing mechanism was explained from the perspective of magnetic field, flow field, and stress changes.","PeriodicalId":20743,"journal":{"name":"Process Safety and Environmental Protection","volume":"11 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2024-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142967759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-28DOI: 10.1016/j.psep.2024.12.095
Hokyong Shon, Veeriah Jegatheesan, Sherub Phuntsho, Li Shu
{"title":"Challenges in Environmental Science and Engineering (CESE-2023)","authors":"Hokyong Shon, Veeriah Jegatheesan, Sherub Phuntsho, Li Shu","doi":"10.1016/j.psep.2024.12.095","DOIUrl":"https://doi.org/10.1016/j.psep.2024.12.095","url":null,"abstract":"","PeriodicalId":20743,"journal":{"name":"Process Safety and Environmental Protection","volume":"1 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2024-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142925069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Liquid air energy storage manages electrical energy in liquid form, exploiting peak-valley price differences for arbitrage, load regulation, and cost reduction. It also serves as an emergency power supply, enhancing the reliability of electricity supply to the consumer. This article presents a case study of a 100 MW liquefied air energy storage (LAES) system. Two systems are proposed: the first is a coupled system that advances LAES through organic Rankine cycle and absorption refrigeration; the second incorporates a circulating process based on the first system. Simulation results show that the Circulating LAES meets the power requirement of 100 MW and provides 11306.25 kW of thermal energy and 1153.24 kW of cooling capacity. The total exergy loss of the Circulating LAES is calculated to be 43743.38 kW. The Circulating LAES has a total investment cost of 6546.96 million RMB. The Circulating LAES reduces CO2 emissions by 23.4 tons per year, and the environmental saving is equivalent to the development of a 70.54 m2 plant with 1–2 year old trees. The research results can be a comparative reference for advanced liquid air energy storage coupled systems.
{"title":"Energy, exergy, economic, and environment evaluations of a novel circulating liquid air energy storage system integrated with organic Rankine cycle and absorption refrigeration","authors":"Yongan Chen, Rongrong Zhai, Jingwei Li, Siyuan Liu, Mengliang Liu, Yu Xu, Chongbao Sun","doi":"10.1016/j.psep.2024.12.102","DOIUrl":"https://doi.org/10.1016/j.psep.2024.12.102","url":null,"abstract":"Liquid air energy storage manages electrical energy in liquid form, exploiting peak-valley price differences for arbitrage, load regulation, and cost reduction. It also serves as an emergency power supply, enhancing the reliability of electricity supply to the consumer. This article presents a case study of a 100 MW liquefied air energy storage (LAES) system. Two systems are proposed: the first is a coupled system that advances LAES through organic Rankine cycle and absorption refrigeration; the second incorporates a circulating process based on the first system. Simulation results show that the Circulating LAES meets the power requirement of 100 MW and provides 11306.25 kW of thermal energy and 1153.24 kW of cooling capacity. The total exergy loss of the Circulating LAES is calculated to be 43743.38 kW. The Circulating LAES has a total investment cost of 6546.96 million RMB. The Circulating LAES reduces CO<ce:inf loc=\"post\">2</ce:inf> emissions by 23.4 tons per year, and the environmental saving is equivalent to the development of a 70.54 m<ce:sup loc=\"post\">2</ce:sup> plant with 1–2 year old trees. The research results can be a comparative reference for advanced liquid air energy storage coupled systems.","PeriodicalId":20743,"journal":{"name":"Process Safety and Environmental Protection","volume":"89 15 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142967765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-27DOI: 10.1016/j.psep.2024.12.105
Long Li, Li Dai, Lin Zeng, Penghui Zhou, Jianping Li, Yulong Chang, Tong Zhang, Aosong Wei, Liang Ma, Hualin Wang
In industrial rubber production, a large volume of recycled rubber particles is generated, presenting significant environmental challenges. Traditional hydrocyclone, however, demonstrate low efficiency in separating these particles. This study aims to optimize hydrocyclone design and investigate how variations in annular gap and inlet number affect separation performance. The study found that as the particles move closer to the underflow outlet in the conical section, their orbital velocity increases, while their rotational velocity decreases. At the wall of the cylindrical-conical interface, the particle velocity in the DIAHC design is reduced by 3.12 % compared to the Traditional design, and in the SIAHC design, it is reduced by 1.98 % compared to the Traditional design. With an increase in flow rate from 300 L/h to 700 L/h, separation efficiency improved by 13.24 % for THC, 22.76 % for SIAHC, and 29.04 % for DIAHC. Additionally, DIAHC reduces the average short-circuit flow by 51.37 % compared to THC and by 23.98 % compared to SIAHC. For particles larger than 10 µm, the separation efficiency of DIAHC reaches 96.56 %, with the lowest concentration reaching 9.4 mg/L. This research not only provides theoretical guidance for the recovery of recycled rubber particles, but also establishes a theoretical and experimental foundation for the separation of low-density two-phase systems in industrial applications.
{"title":"Structure optimization of a hydrocyclone for separation of recycled rubber particles with low-density difference","authors":"Long Li, Li Dai, Lin Zeng, Penghui Zhou, Jianping Li, Yulong Chang, Tong Zhang, Aosong Wei, Liang Ma, Hualin Wang","doi":"10.1016/j.psep.2024.12.105","DOIUrl":"https://doi.org/10.1016/j.psep.2024.12.105","url":null,"abstract":"In industrial rubber production, a large volume of recycled rubber particles is generated, presenting significant environmental challenges. Traditional hydrocyclone, however, demonstrate low efficiency in separating these particles. This study aims to optimize hydrocyclone design and investigate how variations in annular gap and inlet number affect separation performance. The study found that as the particles move closer to the underflow outlet in the conical section, their orbital velocity increases, while their rotational velocity decreases. At the wall of the cylindrical-conical interface, the particle velocity in the DIAHC design is reduced by 3.12 % compared to the Traditional design, and in the SIAHC design, it is reduced by 1.98 % compared to the Traditional design. With an increase in flow rate from 300 L/h to 700 L/h, separation efficiency improved by 13.24 % for THC, 22.76 % for SIAHC, and 29.04 % for DIAHC. Additionally, DIAHC reduces the average short-circuit flow by 51.37 % compared to THC and by 23.98 % compared to SIAHC. For particles larger than 10 µm, the separation efficiency of DIAHC reaches 96.56 %, with the lowest concentration reaching 9.4 mg/L. This research not only provides theoretical guidance for the recovery of recycled rubber particles, but also establishes a theoretical and experimental foundation for the separation of low-density two-phase systems in industrial applications.","PeriodicalId":20743,"journal":{"name":"Process Safety and Environmental Protection","volume":"25 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142967762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-27DOI: 10.1016/j.psep.2024.12.107
Yang Sun, Zijian Liu, Zhe Li, Zhe Cui, Bin Liu, Wende Tian
Coal-to-Ethylene Glycol (CtEG) process discharges large amounts of wastewater due to the lack of control strategy to cope with uncertain disturbances, which increases the treatment cost, environmental pressure, and safety hazards. In this paper, a novel intelligent control strategy is developed to adjust the operating status of CtEG in real time to minimize wastewater emission. Firstly, a rigorous mechanistic modelling of CtEG process is conducted to obtain data set under dynamic disturbances. Based on the data set, the causal relationship between the control variables and wastewater is analyzed using Granger Causality Test (GCT) to establish the global causality map. Subsequently, the proxy model based on extreme gradient boosting (XGBoost) is constructed to calculate the chemical oxygen demand (COD) and product quality by control parameters in global causality map. Moreover, Shapley Additive Explanations (SHAP) method is used to select the vital control variables as actions of reinforcement learning (RL). Thirdly, the intelligent control model based on RL is constructed to determine the optimal decision by considering wastewater discharge, product quality, and operating cost. Finally, the intelligent control model built by coupling multiple models is verified to reduce wastewater COD by 22.8 % and 22.98 % under two different feed disturbances.
{"title":"Intelligent control strategy for coal to ethylene glycol wastewater emission reduction based on dynamic simulation and reinforcement learning","authors":"Yang Sun, Zijian Liu, Zhe Li, Zhe Cui, Bin Liu, Wende Tian","doi":"10.1016/j.psep.2024.12.107","DOIUrl":"https://doi.org/10.1016/j.psep.2024.12.107","url":null,"abstract":"Coal-to-Ethylene Glycol (CtEG) process discharges large amounts of wastewater due to the lack of control strategy to cope with uncertain disturbances, which increases the treatment cost, environmental pressure, and safety hazards. In this paper, a novel intelligent control strategy is developed to adjust the operating status of CtEG in real time to minimize wastewater emission. Firstly, a rigorous mechanistic modelling of CtEG process is conducted to obtain data set under dynamic disturbances. Based on the data set, the causal relationship between the control variables and wastewater is analyzed using Granger Causality Test (GCT) to establish the global causality map. Subsequently, the proxy model based on extreme gradient boosting (XGBoost) is constructed to calculate the chemical oxygen demand (COD) and product quality by control parameters in global causality map. Moreover, Shapley Additive Explanations (SHAP) method is used to select the vital control variables as actions of reinforcement learning (RL). Thirdly, the intelligent control model based on RL is constructed to determine the optimal decision by considering wastewater discharge, product quality, and operating cost. Finally, the intelligent control model built by coupling multiple models is verified to reduce wastewater COD by 22.8 % and 22.98 % under two different feed disturbances.","PeriodicalId":20743,"journal":{"name":"Process Safety and Environmental Protection","volume":"388 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142925055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-27DOI: 10.1016/j.psep.2024.12.106
Jun Ma, Jincheng Lu, Yong Liu, Zhiyong Fan
Dye manufacturing wastewater contains high sulfuric acid and organic contaminants. Organic contaminants complicate treatment and hinder sulfuric acid recovery, causing environmental issues and resource waste. This study combines electro-oxidation with peroxymonosulfate (EO-PMS) to treat highly acidic (∼10 %) wastewater from Dispersed Violet 93 dye. Degradation was monitored in real time using a modified continuous-flow UV-Vis spectrophotometer. EO-PMS efficiently removes organic compounds, allowing the treated acidic liquid to be reused in dye production. At 16 mA/cm² current density and 10 mM PMS, complete degradation of 300 mL wastewater occurred within 6 minutes, achieving 86 % mineralization. Degradation follows zero-order kinetics, with mass transfer efficiency being a key factor. Experimental variables influencing degradation efficiency were also investigated. Free radical scavenging and electron paramagnetic resonance experiments identified ·OH as the main active species (83.6 %), with minor contributions from SO4·- (1.45 %) and others. Experimental data were used to fit the relationships between current intensity, PMS concentration, degradation time, and wastewater disposal costs to assess the economic feasibility of EO-PMS. This study presents an efficient, cost-effective degradation method with real-time monitoring, suitable for industrial-scale treatment and reuse of acidic dye wastewater.
{"title":"Industrial potential of electro-oxidation and peroxymonosulfate coupling for efficient organic degradation in acidic dye wastewater","authors":"Jun Ma, Jincheng Lu, Yong Liu, Zhiyong Fan","doi":"10.1016/j.psep.2024.12.106","DOIUrl":"https://doi.org/10.1016/j.psep.2024.12.106","url":null,"abstract":"Dye manufacturing wastewater contains high sulfuric acid and organic contaminants. Organic contaminants complicate treatment and hinder sulfuric acid recovery, causing environmental issues and resource waste. This study combines electro-oxidation with peroxymonosulfate (EO-PMS) to treat highly acidic (∼10 %) wastewater from Dispersed Violet 93 dye. Degradation was monitored in real time using a modified continuous-flow UV-Vis spectrophotometer. EO-PMS efficiently removes organic compounds, allowing the treated acidic liquid to be reused in dye production. At 16 mA/cm² current density and 10 mM PMS, complete degradation of 300 mL wastewater occurred within 6 minutes, achieving 86 % mineralization. Degradation follows zero-order kinetics, with mass transfer efficiency being a key factor. Experimental variables influencing degradation efficiency were also investigated. Free radical scavenging and electron paramagnetic resonance experiments identified ·OH as the main active species (83.6 %), with minor contributions from SO<ce:inf loc=\"post\">4</ce:inf><ce:sup loc=\"post\">·-</ce:sup> (1.45 %) and others. Experimental data were used to fit the relationships between current intensity, PMS concentration, degradation time, and wastewater disposal costs to assess the economic feasibility of EO-PMS. This study presents an efficient, cost-effective degradation method with real-time monitoring, suitable for industrial-scale treatment and reuse of acidic dye wastewater.","PeriodicalId":20743,"journal":{"name":"Process Safety and Environmental Protection","volume":"20 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142925051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-27DOI: 10.1016/j.psep.2024.12.104
Cong Li, Xuebao Tang, Xingyu Liu, Suqin Li
Quartz ore is a useful raw material for producing high-purity quartz. In this study, high-purity quartz is prepared by superconducting high-gradient magnetic separation (S-HGMS) coupled with fluorine-free acid leaching process. The results indicate that the main impurities in quartz ore are monticellite (Ca (Mg, Fe) SiO4), grossular ((Ca, Fe) (Al, Zr, Fe) Si3O12), thadeuite (Mg (Ca, Mn) (Mg, Fe, Mn)2(PO4)2(OH)2), and berlinite (AlPO4). The weak magnetic impurities are removed by the S-HGMS process, while the fluorine-free acid leaching technology removes berlinite and inclusion impurities from the quartz ore. The final high-purity quartz sand grade is 99.971 %. In addition, experimental analysis as well as first-principles density functional theory (DFT) calculations are utilized to examine the magnetic properties of mineral components in quartz ore. Life cycle assessment (LCA) is conducted to determine the environmental impact of the high-purity quartz sand preparation process, and the contribution of each raw material to high-purity quartz sand production is analyzed. Overall, this study not only establishes an advanced purification process for efficiently removing impurities from quartz ore, which can serve as a theoretical basis for boosting the industrial applications of quartz ore.
{"title":"A novel strategy for the efficient purification of quartz ore: Experiments, DFT calculations, and life cycle assessment","authors":"Cong Li, Xuebao Tang, Xingyu Liu, Suqin Li","doi":"10.1016/j.psep.2024.12.104","DOIUrl":"https://doi.org/10.1016/j.psep.2024.12.104","url":null,"abstract":"Quartz ore is a useful raw material for producing high-purity quartz. In this study, high-purity quartz is prepared by superconducting high-gradient magnetic separation (S-HGMS) coupled with fluorine-free acid leaching process. The results indicate that the main impurities in quartz ore are monticellite (Ca (Mg, Fe) SiO<ce:inf loc=\"post\">4</ce:inf>), grossular ((Ca, Fe) (Al, Zr, Fe) Si<ce:inf loc=\"post\">3</ce:inf>O<ce:inf loc=\"post\">12</ce:inf>), thadeuite (Mg (Ca, Mn) (Mg, Fe, Mn)<ce:inf loc=\"post\">2</ce:inf>(PO<ce:inf loc=\"post\">4</ce:inf>)<ce:inf loc=\"post\">2</ce:inf>(OH)<ce:inf loc=\"post\">2</ce:inf>), and berlinite (AlPO<ce:inf loc=\"post\">4</ce:inf>). The weak magnetic impurities are removed by the S-HGMS process, while the fluorine-free acid leaching technology removes berlinite and inclusion impurities from the quartz ore. The final high-purity quartz sand grade is 99.971 %. In addition, experimental analysis as well as first-principles density functional theory (DFT) calculations are utilized to examine the magnetic properties of mineral components in quartz ore. Life cycle assessment (LCA) is conducted to determine the environmental impact of the high-purity quartz sand preparation process, and the contribution of each raw material to high-purity quartz sand production is analyzed. Overall, this study not only establishes an advanced purification process for efficiently removing impurities from quartz ore, which can serve as a theoretical basis for boosting the industrial applications of quartz ore.","PeriodicalId":20743,"journal":{"name":"Process Safety and Environmental Protection","volume":"41 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142925052","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-27DOI: 10.1016/j.psep.2024.12.108
Surya Kanta Das, Mrigandra Singhai, Sivalingaraju Barisetty, E. Kevin Jason, T. Umadevi, Nilkant Soren, Sujoy Hazra
The present study offers an effective flotation scheme for separating carbonaceous particles in Blast Furnace (BF) pot dust, exploring their complex flotation behaviour through extensive experimental and characterization techniques. The BF pot dust sample exhibits a fine particle size distribution and comprised of diverse mineralogical phases such as hematite, calcite, dolomite, sylvite, and quartz. In addition, abundant carbonaceous particles are found in both amorphous and graphitized forms. In view of this, the present study explores the potential of froth flotation technique using diesel oil as collector and methyl isobutyl carbinol (MIBC) as frother on both direct feed and hydrocyclone-classified feed to recover these carbon values. Direct flotation at 1000 g/t collector dosage failed to achieve target grade and recovery due to ultrafine particle interference, necessitating increased collector dosage. In contrast, the hydrocyclone-classified ultrafine fraction achieved 84.4 % carbon recovery and 66 % fixed carbon grade at 500 g/t collector dosage. Flotation kinetic study revealed that both the samples follows first-order kinetic equation, with the classified feed exhibiting a higher rate constant (0.0384 s−1) compared to the direct feed (0.0225 s−1). Petrographic analysis of the flotation product confirmed an increase in vitrinite content from 18 % to 40 %, while calorimetry showed a significant increase in calorific value from 2287.9 Cal/g to 5340.8 Cal/g. A classification aidflotation scheme is proposed aiming to recover 67.5 % of carbon values at a grade of 66 %.
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