Article
Geochemistry & Geophysics
Jianping Jin, Xinran Zhu, Pengchao Li, Yanjun Li, Yuexin Han
Summary: This study developed a suspension magnetization roasting technology to recover refractory limonite ore. The optimal roasting conditions were determined, and the transformation of hematite and goethite into magnetite during the roasting process was observed. The magnetism of the roasted products significantly improved, indicating the effectiveness of the magnetization roasting technology.
Article
Metallurgy & Metallurgical Engineering
Pengchao Li, Xinran Zhu, Yuexin Han, Wenbo Li
Summary: The dehydroxylation mechanism of limonite was studied in a laboratory fluidization roasting reactor. Results showed that the dehydroxylation occurred at the temperature of 250-350 degrees C and followed the 2-D diffusion reaction model.
MINING METALLURGY & EXPLORATION
(2023)
Article
Chemistry, Physical
Zhidong Tang, Hanxin Xiao, Yongsheng Sun, Peng Gao, Yahui Zhang
Summary: In this study, hydrogen was used as a clean reducing agent for the magnetization roasting of refractory iron ores. The results showed that using hydrogen as the reductant achieved a high iron recovery rate and a concentrate with high iron grade. The study also analyzed the phase composition, magnetic characteristics, and micro-area element content of the ore. This research provides valuable insights for the efficient and clean utilization of refractory iron ores in achieving a carbon-neutral future.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Green & Sustainable Science & Technology
Xiaolong Zhang, Zhenya Zhou, Peng Gao, Yuexin Han
Summary: A novel method was proposed for enhancing iron extraction and dephosphorization from high-phosphorus limonite by suspension magnetization roasting-two stages of grinding and magnetic separation-flotation. The method achieved a flotation concentrate with an iron grade of 59.50% and a phosphorus of 0.317%. Compared with traditional methods, significant improvements were observed in iron grade and recovery.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Green & Sustainable Science & Technology
Yue Cao, Yongsheng Sun, Peng Gao, Wenbo Li
Summary: This research proposes the use of straw-type biomass as a green and alternative reductant for the suspension magnetization roasting of iron ores. The results show that the biomass effectively reduces hematite ores to magnetite, leading to a significant increase in magnetization transformation. The study also investigates the microstructure evolution and thermal decomposition behavior of the iron ore, as well as the composition of organic gases produced during the process.
Article
Metallurgy & Metallurgical Engineering
Zhou Wen-tao, Sun Yong-sheng, Han Yue-xin, Gao Peng, Li Yan-jun
Summary: In this study, a microwave-assisted suspension magnetization roasting technology was proposed to recover and utilize oolitic hematite. The results showed that microwave pretreatment increased the iron grade and recovery of the magnetic concentrate. Microcracks formed during pretreatment promoted the selective transformation of weak magnetic hematite into strong magnetic magnetite.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2022)
Article
Materials Science, Multidisciplinary
Qiang Zhang, Yongsheng Sun, Yuexin Han, Yanjun Li, Peng Gao
Summary: In order to develop limonite and reduce CO2 emissions, siderite is proposed as a clean reductant for suspension magnetization roasting (SMR) of limonite. The study successfully achieved the conversion of weak magnetic minerals to strong magnetic minerals through SMR, enabling the recovery of iron via magnetic separation. The use of siderite as a reductant in SMR has great potential and is encouraged.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2023)
Article
Engineering, Chemical
Yaxiong An, Peng Gao, Jianwen Yu, Yuexin Han
Summary: The reduction behavior of different size fractions of high-purity hematite was investigated to address the asynchronous reaction issue in heterogeneous and complex refractory iron ore. The results indicated that reducing the ore size promoted the transformation from hematite to magnetite, with the newly formed magnetite exhibiting a loose porous structure. This structure facilitated the contact between CO gas and the new hematite surface. However, an increase in ore particle size increased CO diffusion resistance, resulting in an asynchronous reaction.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Engineering, Chemical
Shuai Yuan, Hanxin Xiao, Ruofeng Wang, Yanjun Li, Peng Gao
Summary: Considering the decreasing reserves of high-grade iron ores, the utilization of low-grade iron ores is crucial to the steel industry. This study investigated the effects of reverse flotation and suspension magnetization roasting-magnetic separation on the Fe grade and recovery from low-grade iron ores. The results showed that the optimized suspension magnetization roasting-magnetic separation process significantly enhanced the Fe grade and recovery rate by reducing hematite to magnetite and forming cracks to accelerate the magnetization reaction in the iron ore.
MINERALS ENGINEERING
(2022)
Article
Mining & Mineral Processing
Yue Cao, Yongsheng Sun, Peng Gao, Yuexin Han, Yanjun Li
Summary: Straw-type biomass serves as a promising alternative reductant in suspension roasting, leading to emission reduction and green utilization. Optimal conditions were determined, resulting in high iron grade and recovery rate. The transformation of hematite to magnetite was detected, and positive results were achieved in biomass gas regulation.
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Chemical
Shuai Yuan, Ruofeng Wang, Peng Gao, Yuexin Han, Yanjun Li
Summary: The suspension magnetization roasting technology has been proven to be efficient in recycling manganese and iron, producing high-quality iron and manganese concentrates. This technology selectively converts weakly magnetic hematite, pyrolusite, and bixbyite into magnetite and manganosite, providing a stable and effective method for the utilization of ferromanganese ore.
Article
Materials Science, Multidisciplinary
Haoyan Sun, Zheng Zou, Meiju Zhang, Dong Yan
Summary: This study proposes a fluidized preoxidation-low-temperature reduction magnetization roasting process for the utilization of low-grade refractory siderite-containing iron ore. Through experiments, it was found that the γ-Fe2O3 generated during air oxidation roasting would further convert into weakly magnetic FeO. Stable magnetite can only be obtained through reduction of γ-Fe2O3 at low temperatures. The optimal process parameters for fluidized magnetization roasting were determined to be preoxidation at 610°C for 2.5 min, followed by reduction at 450°C for 5 min. The iron ore concentrate obtained through weak magnetic separation had a grade of 62.0wt% and an iron recovery rate of 88.36%. Compared to conventional direct reduction magnetization roasting, the weak magnetic separation greatly improved the iron recovery by 34.33%. The proposed roasting process enables efficient utilization of low-grade refractory siderite-containing iron ore without wustite generation, and it is not limited by the proportion of siderite and hematite in the ore.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2023)
Article
Green & Sustainable Science & Technology
Chao Chen, Yuexin Han, Yushu Zhang, Yachuan Liu, Yingzhi Liu
Summary: This paper studies the efficient utilization of mixed iron ore with siderite and hematite, and proposes a method of suspension magnetization roasting followed by low-intensity magnetic separation. The results show that this method can achieve high iron grade and recovery rate. These findings provide reference for the development and utilization of mixed iron ore.
Article
Mining & Mineral Processing
Wenbo Li, Jijia Chen, Wentao Zhou, Yuexin Han, Yan Shan
Summary: This study explored the clean magnetization roasting of iron minerals in iron tailings using the in-situ suspension magnetization roasting method in a neutral atmosphere. The results showed that high-grade iron concentrate could be obtained through this process without the need for additional reductants. X-ray diffraction analysis revealed the reduction of weakly magnetic hematite to strongly magnetic magnetite in the neutral atmosphere. The kinetics analysis suggested that the reaction followed a three-dimensional diffusion model, indicating a heterogeneous, diffusion-controlled solid-state reaction.
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Chemical
Zhidong Tang, Peiyu Li, Peng Gao, Yanjun Li, Yuexin Han
Summary: This study proposes a method for treating refractory limonite ore using hydrogen reduction technology. The experimental results show that under optimized conditions, high-grade and high-recovery iron concentrate can be obtained. It is also found that aluminum imposes limitations on the quality improvement of the iron concentrate.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Green & Sustainable Science & Technology
Lars odegaard Bentsen, Narada Dilp Warakagoda, Roy Stenbro, Paal Engelstad
Summary: This study investigates uncertainty modeling in wind power forecasting using different parametric and non-parametric methods. Johnson's SU distribution is found to outperform Gaussian distributions in predicting wind power. This research contributes to the literature by introducing Johnson's SU distribution as a candidate for probabilistic wind forecasting.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Xing Liu, Qiuchen Wang, Yunhao Wen, Long Li, Xinfang Zhang, Yi Wang
Summary: This study analyzes the characteristics of process parameters in three lean gas ethane recovery processes and establishes a prediction and multiobjective optimization model for ethane recovery and system energy consumption. A new method for comparing ethane recovery processes for lean gas is proposed, and the addition of extra coolers improves the ethane recovery. The support vector regression model based on grey wolf optimization demonstrates the highest prediction accuracy, and the multiobjective multiverse optimization algorithm shows the best optimization performance and diversity in the solutions.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Cairong Song, Haidong Yang, Xian-Bing Meng, Pan Yang, Jianyang Cai, Hao Bao, Kangkang Xu
Summary: The paper proposes a novel deep learning-based prediction framework, aTCN-LSTM, for accurate cooling load predictions. The framework utilizes a gate-controlled multi-head temporal convolutional network and a sparse probabilistic self-attention mechanism with a bidirectional long short-term memory network to capture both temporal and long-term dependencies in the cooling load sequences. Experimental results demonstrate the effectiveness and superiority of the proposed method, which can serve as an effective guide for HVAC chiller scheduling and demand management initiatives.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Zhe Chen, Xiaojing Li, Xianli Xia, Jizhou Zhang
Summary: This study uses survey data from the Loess Plateau in China to evaluate the impact of social interaction on the adoption of soil and water conservation (SWC) technology by farmers. The study finds that social interaction increases the likelihood of farmers adopting SWC, and internet use moderates this effect. The positive impact of social interaction on SWC adoption is more pronounced for farmers in larger villages and those who join cooperative societies.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Chenghua Zhang, Yunfei Yan, Kaiming Shen, Zongguo Xue, Jingxiang You, Yonghong Wu, Ziqiang He
Summary: This paper reports a novel method that significantly improves combustion performance, including heat transfer enhancement under steady-state conditions and adaptive stable flame regulation under velocity sudden increase.
JOURNAL OF CLEANER PRODUCTION
(2024)