Journal of Materials Research and Technology-JMR&T
·
2022
·
IF 6.267
Haipei Zhang,Bo Li,Yonggang Wei,Hua Wang,Yindong Yang
The cleaning of copper slag is an important way to realize the sustainable development of the copper metallurgy industry. MgO is a commonly used additive in the cleaning process and has an important impact on the physicochemical properties of copper slag. However, there are few studies on the mechanism of the phase transformation of the ISASMELT copper slag with different additive amounts of MgO. In this study, the mechanism of the phase transformation of copper slag with different additive amounts of MgO and the effect of MgO on the mass action concentration of slag component, physicochemical properties of copper slag and copper loss were elucidated. The results showed that when the MgO was added to copper slag, high melting point hortonolite was formed in the slag. When the additive amount of MgO was more than 4%, high melting point pleonaste was formed. With increasing MgO additive amount, the slag viscosity increased, and the silicate structure tended to be complex. Adding MgO to slag was not conducive to the recovery of matte from copper slag. The results provide a theoretical basis for selecting the most reasonable slag type in the cleaning process of ISASMELT copper slag and selecting the reasonable raw material in the ISASMELT process of copper concentrate.
研究领域:
冶金学
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材料科学
✓ 已验证
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xingyuan Wan,Kaixi Jiang,Ting'an Zhang,Kun Wang,Han Yang,Shengnan Lin
Upgrading copper slag into value-added products provides an untapped opportunity to address arsenic pollution in the environment and promote waste recycling, but the problem of excessive arsenic in products remains a huge engineering challenge. Herein, we employ DFT calculations to explore the dissociation mechanism of AsMA and propose a universal descriptor for screening As removal agents for the first time. The dissociation of AsMA is related to the disturbance of the Mo-As bond by Ba and follows the “Perturbation – Re-stabilization – Dissociation” mechanism. The B Ψ value of Ba is near the minimum value of −0.1058 in the universal descriptors, which renders it potential candidates for As removal agents. As expected, Ba can increase As removal efficiency by approximately 45 % when employing the Si-Ca-Ba alloy compared to other Ca-based alloys. This work offers contributions to the As removal technology for copper slag value-added products while also highlighting the DFT calculations used in guiding engineering practices.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Cong Pan,Yunqiao Wang,Chenyang Fu,Jirong Lan
Smelt slag-based environmental catalytic materials offer a sus(tainable and valuable approach to solid waste management. In this study, a novel peroxymonosulfate (PMS) catalyst (MCT-2) was prepared from copper slag (MCT-1) by a non-calcined method. Subsequently, the MCT/PMS-AOP catalytic system was established. The copper slag, mainly composed of Si, Ca, Mg, Fe and O, was converted into MCT-2 by hydrothermal treatment, NaOH etching and edta-2na-induced crystallization, and finally, the molecular self-loading of MCT was achieved by the "one-pot method" under hydrothermal conditions. MCT-2 exhibits a layered surface morphology and CaFeO 3 phase. In the MCT-2/PMS system, the dominant reactive oxygen species (ROSs) generated were SO 4 •− and HO • . The performance of the system was evaluated using CBZ as a simulated pollutant and actual river water as a carrier, and it was found that MCT-2/PMS degraded CBZ, BPA, DCF and ATZ up to 99 %. Further mechanistic studies showed that MCT-2 has relatively high catalytic activity and the lowest reaction energy barrier compared with similar materials. The easy availability of raw materials, environmentally friendly preparation method, and high degradation efficiency make MCT/PMS-AOP have a broad application prospect.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 28
·e202401039
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IF 1.9
Xueqi Wang,Kai Li,Fei Wang,Lei Shi,Shuangyou Bao,Jiacheng Bao,Xin Sun
Graphical In this study, we prepared the thermally modified copper slag catalyst CS-CaO-900 and applied it to a pilot-scale Fenton-like denitrification system. In single-factor experiments, the effects of six factors, namely inlet NO concentration, H 2 O 2 concentration, catalyst dosage, reaction temperature, L/G ratio, and pH value, on desulfurization and denitrification were investigated. Through analysis of the experimental results, the three factors that had the greatest impact on the maximum denitrification efficiency, namely pH value, H 2 O 2 concentration, and reaction temperature, were selected. The response surface methodology was employed to investigate the significance of the three factors and optimize the parameters, and it was finally determined that the initial pH of the slurry had the greatest impact on the maximum denitrification efficiency, followed by the H 2 O 2 concentration. At the same time, the combination of initial slurry pH and reaction temperature, initial slurry pH and H 2 O 2 concentration also had a large impact on the maximum denitrification efficiency, and the combination of reaction temperature and H 2 O 2 concentration had a non-significant impact on the denitrification efficiency. And through the model optimization to get the best parameters, denitrification experiments under this parameter to achieve the maximum denitrification efficiency of 91.5 %, for further industrial application to provide reference and guidance. In this study, Response Surface Methodology (RSM) was employed to optimize the experimental factors influencing the simultaneous removal of NOx and SO 2 in a spray tower wet scrubbing experiment. Thermally modified copper slag (CS-CaO-900) was prepared by heat treating the original copper slag. The performance of CS-CaO-900 in the synchronized removal of NOx and SO 2 was then evaluated in an expanded experimental setup. Based on single-factor experimental results, the Box-Behnken design of RSM was used to optimize the reaction parameters in a two-stage sequential reactor (bubbling reactor + spray tower). NOx removal efficiency was modeled as a function of reaction temperature, pH, and H 2 O 2 concentration. Regression curves provided a visual representation of the interaction effects among these parameters on NOx removal efficiency in the thermally modified copper slag/H 2 O 2 composite slurry. This study elucidates the characteristics of each parameter under wet scrubbing conditions and provides essential data for industrial applications.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
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2021
·
IF 5.039
Haipei Zhang,Bo Li,Yonggang Wei,Hua Wang
Settling time, system temperature and reductant amount play an important role in the recovery of matte from copper slag. This study investigated the settling behavior of matte particles in copper slag and the effects of the settling time, system temperature, and reductant amount on the macrostructure of slag, microstructure of matte particles, and copper loss. The results showed that the settling behavior of matte particles in slag at the experimental temperature was a process of aggregation and growth. With an increase in settling time and temperature, as well as the addition of an appropriate amount of anthracite, the foaming slag layer of the slowly cooled slag gradually disappeared, while the recovery of matte increased. However, when the amount of anthracite was too high, Fe–Cu alloy formed at the experimental temperature, which resulted in worsened fluidity of the matte in the molten slag and copper loss increased. At the experimental temperature, the settling environment of matte particles in the liquid phase layer was superior to that of the foaming slag layer. The novel idea of using rubber seed oil instead of a traditional fossil reductant to clean the copper slag was put forward. At the temperature of 1250 °C, 4 mL of rubber seed oil was injected, resulting in a settling time of ≥90 min, after which the copper content in the upper part of the slowly cooled slag was less than 0.57 wt.%, reaching the acceptable level of discardable slag in industry.
研究领域:
冶金学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2023
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IF 7.8
Lanbin Wang,Yangming Xu,Yanping Ma,Yu Chen,Anju Yang,Guixiang Gan,Yaguang Du,Yan Sun
Chromite ore processing residue (COPR) and copper slag (CS) are industrial waste slags that cause environmental pollution and require effective treatment. This study proposes a new strategy for the co-treatment and resource utilization of COPR and CS. Under the optimal conditions (liquid-solid ratio of 9.99; H 2 SO 4 concentration of 0.85 M; the CS/COPR mass ratio of 9.98%; temperature of 88.20 ℃; and duration of 60 min), the reduction efficiency of Cr(VI) reached 99.48%, and the total Cr leaching concentration of residue reached 1.35 mg/L, which was below the USEPA regulatory limit of 5 mg/L. In addition, the detoxicated slag containing 61.44 wt% Fe 2 O 3 can be used as a raw material in the steel industry. Through kinetic, characterization, and DFT analyses, the effective remediation of Cr(VI) in COPR by CS is a combination of adsorption and reduction. The unreacted shrinkage nuclear reaction model under the control of the surface chemical reaction is the most suitable model to describe the process, and when the apparent activation energy is 63.90 kJ/mol, the apparent rate equation is: 1-(1-x) 1/3 = 1·371×10 7 [CS/COPR] 2·35004 [H 2 SO 4 ] 2·3945 [L/S] 1·95338 exp(–63·90/RT) This is an important study for waste-waste co-treatment and resource utilization of industrial waste.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
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2024
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IF 6.3
Wanzhen Zhong,Wencong Hao,Shuhao Liang,Xinshenghui Zhu,Siyi Luo,Weiqiang Tan,Zongliang Zuo,Kangshuai Lin,Dongdong Ren
Polyethylene glycols (PEG) are widely employed and frequently detected in wastewater, and between 0.5 and 68 mg L −1 of PEG were found in river water and seawater. It puts significant pressure on COD treatment of the water environment. Nevertheless, PEG is not easily broken down by biological processes, and other treatment methods include drawbacks such as membrane blockage and stringent pH requirements. Ozone oxidation technology can overcome these drawbacks, but low ozone utilization and higher catalytic costs limit the industrialization of the technology to some extent. In this research, discarded copper slag was used as an in situ iron donator, and modified into a catalyst for ozone catalytic oxidation, which achieved lower costs and waste reuse. Based on the Response Surface Methodology simulation and experimental tests, to achieve the greatest catalytic performance, the copper slag was calcined at 710 °C for 3.5 h. Under optimal conditions, with the introduction of CS-710,3.5 to ozone oxidation, the removal rate of PEG was improved from 79.27 % to 97.40 % in 10 min with an initial PEG concentration of 20 mg L −1 . In addition, the COD removal rate was increased by 18.3 % and the first-order rate constant (k) was 2.66 times higher than that of the individual ozone system. After 10 cycles of reuse, the removal rate still reached 73.8 %, indicating the catalyst's good stability. The concentration of Pb and Zn dissolved was 1.6 and 4.4 μg L −1 , respectively, sufficient to meet Environmental quality standards for surface water (GB 3838-2002, China). Thus, the safety of the catalyst is proven. The reaction process based on the free radical mechanism, according to density functional theory (DFT), CS-710,3.5 enhanced the conversion of ozone to OH, O− 2, and 1 O 2 , and hastened the degradation of PEG. Despite taking a while to mineralize fully, PEG was effective in breaking down macromolecules into smaller ones. As such, it can be regarded as a successful PEG pretreatment technique.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Guihong Han,Baogang Cai,Shuzhen Yang,Xin Ding,Bingbing Liu,Yanfang Huang
Microelectrolysis (ME) is an efficient method for treating organic wastewater. The utilization of copper slag for high-performance microelectrolysis material preparation for pollutant degradation is meaningful for environmental conservation. Herein, a Fe-Cu-C microelectrolysis material (MEM) was prepared by carbothermal reduction with copper slag, copper powder and anthracite as the raw materials for phenol degradation in wastewater. The phase and structural transformations that occur in the reduction process of copper slag during MEM preparation were investigated via X-ray diffraction (XRD) and an electroprobe microanalyzer (EPMA). The prepared Fe-Cu-C MEMs were characterized by XRD, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS). The anchored structure of the iron droplets on the SiO 2 bulk surface is beneficial for the microelectrolysis reaction as well as for the stability of the microstructure. The Fe-Cu-C MEM displayed wide pH and temperature application ranges for phenol degradation. Interestingly, 1 O 2 was found to play a critical role in phenol degradation in the ME system. Under the optimal conditions, the phenol degradation efficiency of Fe-Cu-C MEM reached 96.48% after 60 min, with chemical oxygen demand and total organic carbon removal rates of 82.65% and 67.34%, respectively. This research provides a feasible method for the production of Fe-Cu-C MEM and the degradation of phenol in wastewater.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOM
·
2024
·Vol. 76
·期 7
·3492-3503
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IF 2.1
Wang Yaohuan,Zhang Fengxia,Hu Jianhang,Yang Shiliang,Liu Huili,Wang Hua
The recovery of valuable metals from copper slag (CS) is an effective way to realize its resource utilization. However, the use of fossil reductants in the reduction process can result in large amounts of carbon dioxide emissions. Therefore, a low-carbon method for recovering valuable metals from CS using castor oil as a green reductant is proposed in this study. The reduction behavior of CS is investigated through thermodynamic calculations, reduction experiments and thermogravimetric analysis. Under optimal experimental conditions, the recovery ratios of Fe and Cu reach 98.75% and 99.24%. The formed crude concentrate contains 94.27 wt.% Fe, 0.82 wt.% Cu and 0.042 wt.% S, which can partially replace the raw material in the production of weathering steel. Meanwhile, the waste residue produced can be used as the base material for glass-ceramics. The reduction characteristics of castor oil, CS and CaO blends are investigated based on thermogravimetric analysis, and the entire reduction process is divided into five stages. The activation energy of the reduction process is calculated using two iso-conversion methods, KAS and FWO. The reaction models for two reduction stages (stage IV and stage V) are determined using the Coats-Redfern method. The reaction model changes significantly with increasing temperature, shifting from a limiting surface reaction (R2) to a chemical reaction (C3). This study provides new insights into the resource utilization of CS and the development of low-carbon metallurgical technology.
研究领域:
冶金工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2025
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IF 6.6
Sihan Wang,Guishuai Wang,Zhanwei He,Xudong Mao,Mangmang Gao,Chou Kuo-Chih
With the increasing depletion of mineral resources and growing environmental pressures, the resource utilization of industrial solid waste has become crucial for sustainable development. Aiming at copper slag, a typical metallurgical solid waste, a phase-controlled oxidation modification method using CaO-MgO as modifier under high temperature was proposed in this study, which realized the efficient separation and recovery of iron and silicon resources. Through the systematic investigation of key parameters including oxidation temperature, basicity, and holding time, combined with characterization techniques such as XRF, XRD, SEM-EDS, and XPS, the phase transformation mechanism during the oxidation modification process was elucidated. The results showed that the basicity determined the presence form of iron and silicon, the temperature regulated the ion diffusion conditions, and the holding time affected the crystalline integrity of (Mg,Fe 2+ )Fe 2 O 4 . Under optimal conditions (oxidation temperature: 1300 °C, basicity: 2.0, holding time: 60 min), the iron element was effectively enriched to (Mg,Fe 2+ )Fe 2 O 4 and silicon element was converted to Ca 2 SiO 4 , forming distinct phase boundaries favorable for separation. After magnetic separation, the iron recovery rate was 85.83%, the total iron of the concentrate was 46.18%, and the content of Si, P, and S was reduced. The concentrate is suitable for direct recycling as ironmaking raw material in steel plants, and the Ca 2 SiO 4 -rich tailings can be utilized as construction materials to achieve synergistic "waste reduction-resource recovery" treatment of copper slag. This study provides new insights for high value utilization of metallurgical wastes, while offering practical solutions to alleviate resource pressures and environmental risks.
研究领域:
冶金工程
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Applied Sciences-Basel
·
2025
·Vol. 15
·期 10
·5673
·
IF 2.5
Rui Li,Ailin Wen,Jing Li
Chloride ions in zinc refining accelerate equipment corrosion and anode and cathode losses, increase lead content, and reduce zinc quality. Therefore, the removal of chloride ions has become a research priority. The existing copper slag dechlorination process has problems such as the solid film barrier leading to impeded mass transfer, product wrapping triggering active site coverage, and incomplete reactions due to insufficient reaction-driving force, leading to low utilization of copper slag, poor dechlorination efficiency, and long reaction times. To address these issues, a new method of deep dechlorination based on the reduction of Cu2+by liquid-phase mass transfer is proposed in this paper. The process utilizes ascorbic acid as a reducing agent, establishes a homogeneous aqueous phase reaction system, breaks through the solid membrane barrier, and avoids the encapsulation of the product layer, achieving efficient dechlorination. The enol structure of ascorbic acid promotes rapid dechlorination through proton-coupled electron transfer (PCET). Thermodynamic calculations show that compared to the current copper slag dechlorination process, this method increases the reaction-driving force by 18.6%, reduces the Gibbs free energy (ΔGθ) by 59.3%, and increases the equilibrium constant by 6.7 × 109times, making the reaction more complete and achieving a higher degree of purification. The experimental results show that under optimized conditions, the chloride ion concentration in the solution decreases from 1 g/L to 0.0917 g/L within 20 min, with a removal rate of 90.8%. The main precipitate is CuCl. This process provides a more efficient solution to the chloride ion contamination problem in the hydrometallurgical zinc refining process.
研究领域:
冶金工程
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化学工艺
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环境科学
✓ 已验证
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DOI
高影响因子
Minerals
·
2020
·Vol. 10
·期 9
·832
·
IF 2.38
Jie Wu,Jing Li,Feng Rao,Wanzhong Yin
In this study, copper slag reprocessing tailings (CSRT) were synthesized into geopolymers with 40%, 50% and 60% metakaolin. The evolution of compressive strength and microstructures of CSRT-based geopolymers in a marine environment was investigated. Except for compressive strength measurement, the characterizations of X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR) and scanning electron microscopy (SEM) were included. It was found that marine conditions changed the Si/Al ratio in the sodium-aluminosilicate-hydrate (N-A-S-H) gel backbone, promoted the geopolymerization process, led to moreQ4(3Al),Q4(2Al) and Q4(1Al) gel formation and a higher compressive strength of the geopolymers. This provided a basis for the preparation of CSRT-based geopolymers into marine concrete.Keywords:copper slag reprocessing tailings;geopolymer;microstructure;NMR
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）