Behavior of Fe and P during reduction magnetic roasting-separation of phosphorus-rich oolitic hematite

Zhang, Hanquan; Ze-qiang, Zhang; Luo, Liqun; Yu, Hong

doi:10.1080/15567036.2018.1496195

Cited by 17 publications

(4 citation statements)

References 16 publications

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“…2010; Luo and Zhang 2017; Zhang et al. 2018). These properties affect the respective pelletising behaviour.…”

Section: Introductionmentioning

confidence: 99%

“…Artificial magnetite concentrates are obtained from magnetisation reduction roasting followed by magnetic separation. The properties of artificial magnetite differ from those of natural magnetite in hydrophilicity, surface potential, specific surface area and other surface physicochemical properties (Wang et al 2006;Zhu et al 2010;Luo and Zhang 2017;Zhang et al 2018). These properties affect the respective pelletising behaviour.…”

Section: Introductionmentioning

confidence: 99%

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Pelletization characteristics of artificial and natural magnetite and their mixtures

Zhang

et al. 2019

Mineral Processing and Extractive Metallurgy

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In this study, the effects of various characteristics of artificial and natural magnetite concentrates on their pelletizing behaviors were elucidated through batch pelletizing experiments. The results showed that artificial magnetite concentrates exhibit higher hydrophilicity and lower electronegativity compared with natural magnetite concentrates. Additionally, scanning electron microscopy of magnetite particles demonstrated that the surface of artificial magnetite particles was rougher than that of natural magnetite particles, which causes the artificial magnetite to have a larger specific surface area compared with natural magnetite. Pelletizing experiments indicated that the compressive strength of artificial magnetite green pellets was higher than that of natural magnetite green pellets. However, the shock temperature of artificial magnetite green pellet was only 255°C, which is far lower than the requirements of industrial production. It was found that when the pelletizing raw materials were mixed to consist of 20% artificial magnetite and 80% natural magnetite, the ballability increased significantly.

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“…2010; Luo and Zhang 2017; Zhang et al. 2018). These properties affect the respective pelletising behaviour.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pelletization characteristics of artificial and natural magnetite and their mixtures

Zhang

et al. 2019

Mineral Processing and Extractive Metallurgy

Self Cite

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“…However, owing to its complex mineral composition, unique oolitic structure, fine grain size, and high content of harmful phosphorus, it is considered to be one of the most difficult iron ores to separate and utilize in the world [4][5][6][7][8]. Many scholars at home and abroad have carried out a large number research works on high-phosphorus oolitic hematite, which were mainly traditional mineral processing technologies, including magnetic separation and flotation, magnetization roasting technology, a leaching process, and a smelting process [9][10][11][12][13][14][15][16][17]. However, due to the complex mineralogical characteristics of high-phosphorus oolitic hematite, they have failed to meet the ideal separation index and environmental requirements.…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Additives on Reaction Characteristics of Fluorapatite During Coal-Based Reduction of Iron Ore

Sun

Zhou

Han

et al. 2019

Metals

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In the coal-based reduction of high phosphorus oolitic hematite, it is particularly important to study the mechanism of phosphorus regulation during the formation of iron metals for the efficient development and utilization of iron ore. In this study, the thermodynamics of the coal-based reduction process of fluorapatite in different mineral systems, effect mechanism of the reduction degree, kinetics, mineral composition, and morphology of structural evolution samples were systematically investigated using FactSage software, single factor analysis, the isothermal method, X-ray diffraction (XRD), scanning electron microscope (SEM), and an energy dispersive spectrometer (EDS). Thermodynamic analysis indicates that the effect of the SiO2–Fe2O3–C system on reducing the initial reduction temperature of fluorapatite was stronger than that of the Al2O3–Fe2O3–C system. The effect mechanism of the reduction degree demonstrates that increasing the dosage of silica, iron oxide, carbon, reduction time, and reduction temperature could promote the reduction reaction of fluorapatite under certain conditions. Dynamics analysis shows that the best kinetic mechanism functions of the SiO2–Fe2O3–C system and the Al2O3–Fe2O3–C system were A1/3 = 1/3(1 − α)[−ln(1 − α)]−2 and A1/2 = 1/2(1 − α)[−ln(1 − α)]−1, respectively. The activation energy and pre-exponential factor of the reduction kinetics equation in the system containing silica were significantly lower than that in the system containing alumina, which explained that the catalytic effect of silica on the reduction of calcium fluorophosphate was far greater than that of alumina. XRD and SEM/EDS analysis indicate that the solid–solid reaction of alumina, silica, iron, and fluorapatite occurred during the reduction process, while calcium aluminate, calcium silicate, and calcium oxide were formed at the contact point. Among them, iron could absorb P2 gas so that it played a greater role in promoting the reduction of fluorapatite. Increasing the reduction temperature and prolonging the reduction time were beneficial to the reduction of fluorapatite.

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“…The starch inhibitor negatively affected adsorption on quartz, but positively influenced adsorption of phosphorus minerals.Processes 2019, 7, 388 2 of 17 low-intensity magnetic separation (LIMS) process to obtain high-grade iron concentrate products. Materials such as coal, natural gas, coal gas, and combustible exhaust gas can be used as fuel for this process [5]. Suspended flash magnetic roasting is characterized by its high magnetization velocity, high production efficiency, high magnetic susceptibility, no need for secondary high-temperature oxidation, high iron recovery, and sufficient utilization of iron ores resource [6,7].…”

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confidence: 99%

Increasing Iron and Reducing Phosphorus Grades of Magnetic-Roasted High-Phosphorus Oolitic Iron Ore by Low-Intensity Magnetic Separation–Reverse Flotation

Xiao

Zhou

2019

Processes

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High-phosphorus oolitic iron ore, treated by suspended flash magnetic roasting, contained 42.73% iron (mainly present as magnetite) and 0.93% phosphorus (present as collophane). Low-intensity magnetic separation (LIMS) was combined with reverse flotation to increase the iron and reduce the phosphorus contents of the roasted product. The results showed that an optimized iron ore concentrate with an iron grade of 67.54%, phosphorus content of 0.11%, and iron recovery of 78.99% were obtained under LIMS conditions that employed a grind of 95% −0.038 mm and a magnetic field of 0.10 T. Optimized rougher reverse-flotation conditions used a pulp pH of 9 and dosages of toluenesulfonamide, starch, and pine alcohol oil of 800 g/t, 1000 g/t, and 40 g/t, respectively; optimized scavenging conditions used a pulp pH of 9 and dosages of toluenesulfonamide, starch, and pine alcohol oil of 400 g/t, 500 g/t, and 20 g/t, respectively. Study of the mechanism of phosphorus reduction showed that the toluenesulfonamide could be adsorbed on the surface of quartz after the action of starch, but adsorption was significantly weakened. The starch inhibitor negatively affected adsorption on quartz, but positively influenced adsorption of phosphorus minerals.

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Behavior of Fe and P during reduction magnetic roasting-separation of phosphorus-rich oolitic hematite

Cited by 17 publications

References 16 publications

Pelletization characteristics of artificial and natural magnetite and their mixtures

Pelletization characteristics of artificial and natural magnetite and their mixtures

Effect of Different Additives on Reaction Characteristics of Fluorapatite During Coal-Based Reduction of Iron Ore

Increasing Iron and Reducing Phosphorus Grades of Magnetic-Roasted High-Phosphorus Oolitic Iron Ore by Low-Intensity Magnetic Separation–Reverse Flotation

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