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
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
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
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
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
Engineering, Environmental
Zhidong Tang, Yuexin Han, Yue Cao, Yongsheng Sun, Peng Gao
Summary: Efficient utilization and clean recycling of low-grade refractory iron ore can be achieved through suspension magnetization roasting (SMR) using reducing gases of CO and H-2 mixture. In a semi-industrial test, the optimal conditions were determined, resulting in an iron grade of 59.27% and a recovery of 96.30%. The iron transformation was mainly from mFe(2)O(3)center dot nH(2)O to Fe3O4, and the magnetic magnetization increased from 0.1 to 27.71 A center dot m(2)center dot kg(-1). The SMR is a green and effective technology for low-grade limonite waste utilization.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
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
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
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
Jianwen Yu, Yanfeng Li, Yang Lv, Yuexin Han, Peng Gao
Summary: An innovative suspension magnetization roasting followed by magnetic separation process was developed to recover iron from high-iron red mud. Under the optimized conditions, an iron concentrate with high purity and recovery rate was obtained. The suspension magnetization roasting converted hematite into magnetite, improving the magnetism, and also allowed hematite and alumina to enter the iron concentrate, increasing the aluminum content.
MINERALS ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Xinlei Wei, Yongsheng Sun, Yanjun Li, Peng Gao
Summary: This paper investigates the reduction roasting and magnetic separation of cobalt oxide ore, and obtains the optimal magnetic separation performance. It also explores the phase transformation and surface structure changes of the sample during roasting.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
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
Metallurgy & Metallurgical Engineering
Ruo-feng Wang, Shuai Yuan, Peng Gao, Yan-jun Li
Summary: A suspension magnetization roasting-magnetic separation technology was proposed for the recovery of iron minerals. The optimized parameters achieved a high separation efficiency.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2022)
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
Engineering, Chemical
Pengfei Liu, Shuai Yuan, Yongsheng Sun, Yuexin Han, Peng Gao, Yanjun Li
Summary: In this study, suspension magnetization roasting and low-intensity magnetic separation were used to process ferromanganese ore, resulting in the production of magnetic and nonmagnetic products with high-grade iron and manganese contents respectively. The analysis of the process mechanism showed that the treated products had enhanced magnetic properties and a rougher and more porous surface. This method provides a way for the recycling and utilization of ferromanganese ore.
