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For improving the strength of pellets made of ultrafine and super-high-grade magnetite concentrates, the influence of basicity (CaO/SiO2 ratio) on the roasting and consolidation of pellets was investigated. The results showed that with the basicity of pellets increasing from 0.09 to 0.60, the compressive strength of both preheated and roasted pellets achieved an evident improvement from 502 and 2519 to 549 and 3096 N/pellet, respectively; meanwhile, the roasting time decreased from 15 to 9 min. The low-viscosity liquid phases were easily generated in fired pellets at the basicity range of 0.40–0.60 under the roasting temperature of 1240 °C, filled the voids between hematite particles and tightened the bonding among particles, effectively restraining the generation of concentric cracks and decreasing the porosity of fired pellets; low-viscosity liquid phases facilitated the solid diffusion of hematite, leading to the formation of coarse hematite crystals and thicker connecting necks.
Feng Zhang; De-Qing Zhu; Jian Pan; Zheng-Qi Guo; Meng-Jie Xu. Improving roasting performance and consolidation of pellets made of ultrafine and super-high-grade magnetite concentrates by modifying basicity. Journal of Iron and Steel Research International 2020, 27, 770 -781.
AMA StyleFeng Zhang, De-Qing Zhu, Jian Pan, Zheng-Qi Guo, Meng-Jie Xu. Improving roasting performance and consolidation of pellets made of ultrafine and super-high-grade magnetite concentrates by modifying basicity. Journal of Iron and Steel Research International. 2020; 27 (7):770-781.
Chicago/Turabian StyleFeng Zhang; De-Qing Zhu; Jian Pan; Zheng-Qi Guo; Meng-Jie Xu. 2020. "Improving roasting performance and consolidation of pellets made of ultrafine and super-high-grade magnetite concentrates by modifying basicity." Journal of Iron and Steel Research International 27, no. 7: 770-781.
The characteristics of iron ore fines were considered to have tremendous effects on their subsequent sintering performances, but it is difficult to judge their sintering performances only based on their basic physicphysio-chemical properties. In this study, the correlation between the fundamental high temperature properties of seven commercial Australian iron ore fines and their single-ore sintering performance were revealed by measuring the lowest assimilation temperature (LAT), index of fluidity of liquid phase (IFL), strength of bonding phases (SBP) and the percentage of formed silicoferrite of calcium and aluminium (SFCA) of the iron ores and conducting pilot scale sintering pot tests. The results showed that the correlation is very complicated. There is a negative correlation between the tumble index (TI) of sinter products and LAT of iron ore fines. Iron ore fines have better sintering performance within the appropriate range of IFL between 0.17 and 0.88. The correlativity between SBP, percentage of formed SFCA (PFS) and the sintering performance of iron ore fines is complex.
De-Qing Zhu; Feng Zhang; Jian Pan; Zheng-Qi Guo. The correlation between high temperature properties and sintering performance of Australian iron ore fines. Mineral Processing and Extractive Metallurgy 2018, 130, 73 -81.
AMA StyleDe-Qing Zhu, Feng Zhang, Jian Pan, Zheng-Qi Guo. The correlation between high temperature properties and sintering performance of Australian iron ore fines. Mineral Processing and Extractive Metallurgy. 2018; 130 (1):73-81.
Chicago/Turabian StyleDe-Qing Zhu; Feng Zhang; Jian Pan; Zheng-Qi Guo. 2018. "The correlation between high temperature properties and sintering performance of Australian iron ore fines." Mineral Processing and Extractive Metallurgy 130, no. 1: 73-81.
Sintering performance of a series of sinter blends with high ratio of limonite was investigated. The metallurgical performance and mineralogy of product sinter were also examined. The results show that good sintering performance could be obtained when the ratio of limonite was below 43% in the blends of iron ore fines, while good microstructure and metallurgical properties were achieved under optimum sintering conditions. In contrast, sintering performance will rapidly deteriorate when the ratio of limonite is elevated up to 63% in the blends.
Feng Zhang; De-Qing Zhu; Jian Pan. Sintering Performance of Blends Containing High Proportion of Limonite. Proceedings of the International Conference on Martensitic Transformations: Chicago 2017, 615 -625.
AMA StyleFeng Zhang, De-Qing Zhu, Jian Pan. Sintering Performance of Blends Containing High Proportion of Limonite. Proceedings of the International Conference on Martensitic Transformations: Chicago. 2017; ():615-625.
Chicago/Turabian StyleFeng Zhang; De-Qing Zhu; Jian Pan. 2017. "Sintering Performance of Blends Containing High Proportion of Limonite." Proceedings of the International Conference on Martensitic Transformations: Chicago , no. : 615-625.
In this paper, an effective method was developed to remove phosphorus and upgrade iron from high phosphorus oolitic hematite ore by high temperature flash reduction—a wet magnetic separation process. A thermodynamic analysis of iron and phosphorus mineral reactions and experiments with Fe-P separation process were performed, and the mechanism of phosphorus removal and beneficiation of iron is discussed as well. The results show that under the proper conditions, a final metallic iron powder assaying over 91% Fe and 0.25% P was obtained with iron recovery of 90% and phosphorus removal rate of 91.79% using the new process, indicating that the high temperature flash reduction process is a feasible and efficient way to process this kind of complex and refractory iron ore. Moreover, sodium sulfate is found to be capable of improving the removal of phosphorus and the upgrading of iron, as well as enhancing the growth of metallic iron grains significantly for higher recovery of iron.
Deqing Zhu; Zhengqi Guo; Jian Pan; Feng Zhang. Synchronous Upgrading Iron and Phosphorus Removal from High Phosphorus Oolitic Hematite Ore by High Temperature Flash Reduction. Metals 2016, 6, 123 .
AMA StyleDeqing Zhu, Zhengqi Guo, Jian Pan, Feng Zhang. Synchronous Upgrading Iron and Phosphorus Removal from High Phosphorus Oolitic Hematite Ore by High Temperature Flash Reduction. Metals. 2016; 6 (6):123.
Chicago/Turabian StyleDeqing Zhu; Zhengqi Guo; Jian Pan; Feng Zhang. 2016. "Synchronous Upgrading Iron and Phosphorus Removal from High Phosphorus Oolitic Hematite Ore by High Temperature Flash Reduction." Metals 6, no. 6: 123.
In the paper, a new technology was developed to improve the beneficiation of copper and iron components from copper slag, by modifying the molten slag to promote the mineralization of valuable minerals and to induce the growth of mineral grains. Various parameters, including binary basicity, dosage of compound additive, modification temperature, cooling rate and the end point temperature of slow cooling were investigated. Meanwhile, optical microscope, scanning electron microscope and energy dispersive spectrometer (SEM-EDS) was employed to determine the mineralogy of the modified and unmodified slag, as well as to reveal the mechanisms of enhancing beneficiation. The results show that under the proper conditions, the copper grade of rougher copper concentrate was increased from 6.43% to 11.04%, iron recovery of magnetic separation was increased significantly from 32.40% to 63.26%, and other evaluation indexes were changed slightly, in comparison with unmodified copper slag. Moreover, matte and magnetite grains in the modified slag aggregated together and grew obviously to the mean size of over 50 μm, resulting in an improvement of beneficiation of copper and iron.
Zhengqi Guo; Deqing Zhu; Jian Pan; Tengjiao Wu; Feng Zhang. Improving Beneficiation of Copper and Iron from Copper Slag by Modifying the Molten Copper Slag. Metals 2016, 6, 86 .
AMA StyleZhengqi Guo, Deqing Zhu, Jian Pan, Tengjiao Wu, Feng Zhang. Improving Beneficiation of Copper and Iron from Copper Slag by Modifying the Molten Copper Slag. Metals. 2016; 6 (4):86.
Chicago/Turabian StyleZhengqi Guo; Deqing Zhu; Jian Pan; Tengjiao Wu; Feng Zhang. 2016. "Improving Beneficiation of Copper and Iron from Copper Slag by Modifying the Molten Copper Slag." Metals 6, no. 4: 86.