Article
Materials Science, Multidisciplinary
Kun Wang, Yan Liu, Zhihe Dou, Guozhi Lu, Xiaofei Li, Ting-An Zhang
Summary: A novel method of extracting iron from high-iron red mud and preparing low-carbon cement clinker from tailings was proposed. Thermodynamics of smelting reduction were calculated and the effects of different conditions on iron recovery were investigated systematically. Experimental results showed that under optimal conditions, the iron recovery rate reached 97.6% and the obtained metal met the industrial standard of pig iron for steelmaking.
Article
Environmental Sciences
Dandan Huang, Yanxiu Wang, Chengwen Wang, Le Tao, Xiangsong Meng, Li Wang, Wei Sun
Summary: In this study, the distribution patterns of different particle sizes of red mud were analyzed using TIMA and EDS, and the alkali removal performance was compared under high temperature grading. The results showed that non-clay phases in the particles coagulate with clay phases, forming a mixture phase with impurities. The high-temperature grading effectively separated the elements and phases, promoting the comprehensive utilization of red mud.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Alexander Boyarintsev, Htet Ye Aung, Sergei Stepanov, Andrei A. Shoustikov, Pavel I. Ivanov, Vladimir G. Giganov
Summary: The study investigated the leaching of scandium from landfilled bauxite residue and alkaline pretreated red mud, and found that ultrasonic treatment under alkaline conditions can significantly improve scandium extraction rate. The leaching of red mud in carbonate/bicarbonate media is accompanied by secondary processes, leading to a decrease in extraction efficiency.
Article
Construction & Building Technology
Choonghyun Kang, Taewan Kim
Summary: This study aims to develop new applications for seawater desalination brine by using it in the production of high-volume red mud cement. Experiments were conducted to develop and characterize 30 mixtures of red mud, slag, and CaO. The results showed that smaller red mud particles and the addition of CaO significantly improved the strength of the cement. Brine also promoted hydration reaction and the formation of hydration reactants more than freshwater. Therefore, the combination of brine and high-volume red mud slag cement is applicable to the production of non-structural elements and small building components.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Kui Zeng, Xuejun Quan, Qibing Jiang, Zhanghao Jiang, Facheng Qiu
Summary: This study investigates an efficient dealkalization process for red mud by using microwaveroasting and water leaching with the addition of CaO. It is found that microwaveroasting has better dealkalization efficiency and lower energy consumption compared to conventional roasting. The optimal conditions for dealkalization are determined as a CaO/SiO2 molar ratio of 2.4, a microwave power of 2.5 kW, a roasting temperature of 500 degrees C, a roasting time of 45 min, a liquid-solid ratio of 8 mL/g, a leaching temperature of 90 degrees C, and a leaching time of 80 min. Ball milling enhances the mixing degree of red mud and CaO, while microwave roasting effectively improves the crystal phase transformation of the alkali component in red mud.
Article
Chemistry, Applied
Shiwei Ma, Fang Cheng, Junguang Meng, Huijun Ge, Ping Lu, Tao Song
Summary: The feasibility of using Ni-enhanced red mud in chemical looping steam methane reforming (CL-SMR) was evaluated. It was found that the Ni-enhanced red mud displayed desirable reactivity and cyclic stability, with CO selectivity reaching 94.1% and H-2/CO ratio of 2.01 at the most suitable temperature of 900 C. The Ni species effectively activated the C-H bond of methane and facilitated the transfer of lattice oxygen.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Metallurgy & Metallurgical Engineering
Shrey Agrawal, Nikhil Dhawan
Summary: The current study investigated alkali baking and leaching processes to extract valuable elements such as Al, Fe, Ti, Sc, and Ga. Sodium hydroxide was used for baking, followed by water and sulfuric acid leaching. The research demonstrated that alkali baking formed sodium metal oxide phases, which enhanced the dissolution of metals in sulfuric acid. The study also determined the optimal parameters for the process, achieving high dissolution rates for various elements. Carbonation and thermal hydrolysis were utilized to obtain pure alumina and titania products, respectively. The proposed process showed efficient extraction and generation of valuable products.
Article
Construction & Building Technology
Songhui Liu, Yuanyuan Shen, Yuli Wang, Peiliang Shen, Dongxing Xuan, Xuemao Guan, Caijun Shi
Summary: A room temperature in-situ wet carbonation method was proposed to activate sintering red mud waste (SRM) and sequester CO2, which resulted in the formation of fine calcite crystals and silica-alumina gel. The carbonated SRM exhibited a high CO2 sequestration rate and pozzolanic reactivity, making it a potential cement mineral admixture.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Engineering, Environmental
Hongming Jiang, Shuchang Yan, Jingzhi Yan, Chengyang Li, Yan Lin, Zengli Zhao, Zhen Huang, Hongyu Huang, Haibin Li
Summary: Red mud, an alkaline waste residue from the aluminum industry, can be used as a raw material for preparing oxygen carriers. This study discussed the desulfurization performance and mechanism of different types of red mud oxygen carriers under various reaction conditions. The results showed that the desulfurization capacity of red mud oxygen carriers mainly relied on Na/Ca elements, while Fe2O3 had no desulfurization capacity at temperatures above 750 degrees C. Water-washed red mud oxygen carriers exhibited good desulfurization performance, with WS900 achieving a desulfurization efficiency of 86.28% at 900 degrees C. The red mud oxygen carriers prepared at 800-900 degrees C demonstrated good desulfurization activity, while those prepared at 1000 degrees C or above showed a significant decline in performance. The key components responsible for desulfurization activity in red mud oxygen carriers included Na2Ti3O7, Ca2SiO4, and CaTiO3, while NaAlSiO4, Na6Al4Si4O17, and Ca2Al2SiO7 had minimal sulfur fixation capacity. The redox performance of the red mud oxygen carriers under multi-cycle conditions was minimally affected by the H2S atmosphere, and the water-washed red mud oxygen carriers rich in Na and Ca exhibited the best redox performance.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Shengnan Lin, Tingan Zhang, Boran Zhang, Xi Chao
Summary: Bayer red mud is a solid waste generated during the production of alumina by the Bayer process. The stock of red mud in China is over 1.1 billion tons, covering an area of more than 120,000 mu, and the annual production volume is increasing. The comprehensive utilization of red mud is still a difficult problem, and actively exploring new methods for removing sodium from red mud is of great significance. This study combines the traditional red mud desalination process with the slurry electrolysis process to explore the influence of different leaching agents on the leaching and sodium removal of red mud slurry in the presence of an electric field. Experimental results show that the red mud leached with pure dilute hydrochloric acid has the highest sodium removal rate.
BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
(2022)
Article
Energy & Fuels
Miao Miao, Tuo Zhou, Xiannan Hu, Man Zhang, Hairui Yang
Summary: Circulating fluidized bed (CFB) technology is rapidly developing, but the effective treatment measure for N2O emission is still lacking. In this study, the catalytic performance and apparent activation energy of red mud and its main components for N2O decomposition were investigated. Red mud showed higher catalytic activity for N2O decomposition compared to single oxide and mixed oxide with different proportions in red mud. Red mud as a bed material or additive exhibited better N2O decomposition ability and economic performance.
Article
Materials Science, Multidisciplinary
Junhui Xiao, Nanlan Zhong, Deqiang Gao, Kai Zou, Zhen Wang, Wenxiao Huang, Wenliang Xiong
Summary: The efficient extraction of iron from Bayer red mud using roasting and magnetic separation has been investigated, resulting in the recovery of a high-purity iron concentrate.
Article
Metallurgy & Metallurgical Engineering
Ding Wei, Xiao Jun-Hui, Peng Yang, Shen Si-Yue, Chen Tao
Summary: The addition of sodium sulfate during red mud segregation roasting process can enhance the separation and recovery of iron, resulting in a metallic iron concentrate with high quality.
MINERAL PROCESSING AND EXTRACTIVE METALLURGY REVIEW
(2021)
Article
Engineering, Environmental
Jiannan Pei, Xiaolin Pan, Yanming Zhang, Haiyan Yu, Ganfeng Tu
Summary: A novel low-calcium sinter process was proposed for alkali and alumina recovery from red mud, achieving full utilization of the waste material. Under optimal sintering conditions, the recovery efficiencies for alumina and alkali reached over 93% and 96% respectively, with the final product suitable for widespread use in building materials.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Environmental
Wang Li, Xudong Yan, Zepeng Niu, Xiaobo Zhu
Summary: Selective leaching of vanadium and separation of iron from red mud using oxalic acid and sodium sulfite were studied, showing that over 90% of vanadium could be selectively leached under suitable conditions. The leaching mechanism was analyzed with XRD, SEM-EDS, thermodynamic theory, and leaching kinetics, demonstrating controlled diffusion and chemical reaction processes for vanadium and iron leaching, respectively. The apparent activation energy of vanadium and iron were determined and the presence of stable complexes in the leaching solution was identified.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Environmental
Shun-Shun Chen, Xu-Xiu Chen, Tian-Yu Yang, Li Chen, Zheng Guo, Xing-Jiu Huang
Summary: A temperature-modulated sensing strategy was proposed to identify and determine BTEX compounds. Highly effective identification of BTEX was achieved using linear discrimination and convolutional neural network analyses. Additionally, quantitative analysis of concentration was accomplished by establishing the relationship between concentration and response.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
Article
Engineering, Environmental
Myungkyung Noh, Jeong Yeon Sim, Jisung Kim, Jee Hwan Ahn, Hye-Young Min, Jong-Uk Lee, Jong-Sook Park, Ji Yun Jeong, Jae Young Lee, Shin Yup Lee, Hyo-Jong Lee, Choon-Sik Park, Ho-Young Lee
Summary: This study reveals that chronic exposure to PM induces chronic inflammation and development of COPD by dysregulating NAD+ metabolism and subsequent SIRT1 deficiency in pulmonary macrophages. Activation of SIRT1 by resveratrol effectively mitigates PM-induced inflammation and COPD development. Targeting metabolic and epigenetic reprogramming in macrophages induced by PM is a promising strategy for COPD treatment.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
Article
Engineering, Environmental
Yu Liu, Linlin Qin, Yiming Qin, Tong Yang, Haoran Lu, Yulong Liu, Qiqi Zhang, Wenyan Liang
Summary: Co/NC/PAC electrode was prepared by compounding ZIF-67 with powder-activated carbon for the electrocatalytic treatment of nitrogen-containing heterocyclic compounds. The degradation efficiency of the four compounds reached 90.2-93.7% under optimal conditions, and the degradation order was pyridazine < pyrimidine < pyrazine < pyridine.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
Article
Engineering, Environmental
Julien Couturier, Pierre Tamba Oulare, Blanche Collin, Claire Lallemand, Isabelle Kieffer, Julien Longerey, Perrine Chaurand, Jerome Rose, Daniel Borschneck, Bernard Angeletti, Steven Criquet, Renaud Podor, Hamed Pourkhorsandi, Guilhem Arrachart, Clement Levard
Summary: This study analyzes the properties of bauxite residue samples and explores the influence of bauxite ore origin, storage conditions, and storage time. The results show that the speciation of yttrium is related to the origin of bauxite ore, while no significant variation was observed with storage conditions or aging of the residues.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
Article
Engineering, Environmental
Sakthinarenderan Saikumar, Ravi Mani, Mirunalini Ganesan, Inbakandan Dhinakarasamy, Thavamani Palanisami, Dharani Gopal
Summary: Microplastic contamination in marine ecosystems poses a growing concern due to its trophic transfer and negative effects on marine organisms. This study investigates the transfer and impacts of polystyrene microplastics in an estuarine food chain. The results show that microplastics can be transferred through the food chain, although the transfer rates are low. The exposed organisms exhibit stress responses, suggesting the potential risk of microplastics reaching humans through the food chain.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
Review
Engineering, Environmental
Yan-Jiao Li, Ying Yuan, Wen-Bing Tan, Bei-Dou Xi, Hui Wang, Kun-Long Hui, Jia-Bao Chen, Yi-Fan Zhang, Lian-Feng Wang, Ren-Fei Li
Summary: This review investigated and analyzed the distribution, composition, and abundance of heavy metals and antibiotic resistance genes (ARGs) in landfill. The results showed that heavy metals have lasting effects on ARGs, and complexes of heavy metals and organic matter are common in landfill. This study provides a new basis to better understand the horizontal gene transfer (HGT) of ARGs in landfill.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
Article
Engineering, Environmental
Jessy Joseph, Ari Vaisanen, Ajay B. Patil, Manu Lahtinen
Summary: Efficient and environmentally friendly porous hybrid adsorbent beads have been developed for the removal of arsenic from drinking water. The structural tuning of the adsorbents has been shown to have a significant impact on their adsorption performance, with high crystallinity leading to increased adsorption capacity and selectivity towards As5+.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
Article
Engineering, Environmental
Yangyang Liu, Minhua Xiao, Kaiqin Huang, Juntao Cui, Hongli Liu, Yingxin Yu, Shengtao Ma, Xihong Liu, Meiqing Lin
Summary: This study measured the levels of phthalate metabolites in breast milk collected from mothers in southern China. The results showed that phthalates are still prevalent in the region, and breastfeeding contributes to phthalate intake in infants. However, the levels detected do not pose significant health risks to infants based on dietary exposure. The increasing exposure to certain phthalates calls for further research into their sources and potential risks.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
Article
Engineering, Environmental
Zhiqiang Wu, Jianxing Sun, Liting Xu, Hongbo Zhou, Haina Cheng, Zhu Chen, Yuguang Wang, Jichao Yang
Summary: Ocean depth affects microbial diversity, composition, and co-occurrence patterns of microplastic microbial communities. Deterministic processes dominate the assembly of mesopelagic plastisphere microbial communities, while stochastic processes shape the assembly of bathypelagic microbial communities. The relationships between microorganisms in the mesopelagic layer are more complex and stable, with Proteobacteria and Actinobacteriota playing important roles.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
Article
Engineering, Environmental
Tingting Xiao, Renjie Chen, Chen Cai, Shijie Yuan, Xiaohu Dai, Bin Dong, Zuxin Xu
Summary: Based on the efficiency of catalytic ozonation techniques in enhancing sludge dewaterability, this study investigated its effectiveness in simultaneous reduction of antibiotics and antibiotic resistance genes. The results showed that catalytic ozonation conditioning changed the distribution of antibiotics and achieved high degradation rates. It also significantly reduced the abundance of ARGs, inhibited horizontal gene transfer, and decreased the signal transduction of typical ARGs host bacteria.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
Article
Engineering, Environmental
Yang Deng, Xiaohong Guan
Summary: This article discusses two different development approaches for ferrate(VI) technology in water treatment, arguing that process integration is a promising method that can drive technological innovation and revolution in water treatment, achieving higher treatment efficiency, reduced costs and energy consumption, and a smaller physical footprint.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
Article
Engineering, Environmental
Zhe Zhang, Lu Zhang, Zhihao Huang, Yuxin Xu, Qingqing Zhao, Hongju Wang, Meiqing Shi, Xiangnan Li, Kai Jiang, Dapeng Wu
Summary: In this study, a floating catalytic foam was designed and prepared to enhance the mass transfer in immobilized photocatalysts for wastewater treatment. The floating catalytic foam could float on the water surface and establish a temperature gradient, effectively promoting the diffusion and adsorption of target molecules during the photocatalytic process.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
Article
Engineering, Environmental
Muhammad Nafees, Adiba Khan Sehrish, Sarah Owdah Alomrani, Linlin Qiu, Aasim Saeed, Shoaib Ahmad, Shafaqat Ali, Hongyan Guo
Summary: The accumulation of cadmium and antibiotics in edible plants and fertile soil is a worldwide problem. This study investigated the potential of zinc oxide nanoparticles to alleviate the toxicity of both cadmium and antibiotics and promote spinach growth.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
Article
Engineering, Environmental
Lurui Wan, Kai Wang, Yuan Chen, Zhiyong Xu, Wenbo Zhao
Summary: In this study, a low viscosity and high thermal stability SO2 absorbent with dual interacting sites was successfully synthesized. The absorbent showed the highest absorption enthalpy change and entropy change values among reported SO2 absorbents, and exhibited lower viscosity and comparable thermal stability to ILs.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
Article
Engineering, Environmental
Zhengwei Zhou, Guojie Ye, Yang Zong, Zhenyu Zhao, Deli Wu
Summary: This study utilized Mo powder and STPP to enhance the performance of the sodium percarbonate system in pollutant degradation. The presence of Mo and STPP resulted in a higher degradation rate of the model pollutant SMX, with low oxidant consumption. The system generated multiple active species through a series of chain reactions at different pH values, exhibiting excellent performance towards electron-rich pollutants. Furthermore, Mo demonstrated excellent stability and reusability.
JOURNAL OF HAZARDOUS MATERIALS
(2024)