— The effect of CaCO3, Na2CO3, and CaF2 on the reduction roasting and magnetic separation of high-phosphorus iron ore containing phosphorus in the form of Fe3PO7 and apatite was investigated. The results revealed that Na2CO3 had the most significant effect on iron recovery and dephosphorization, followed by CaCO3, the effect …
This paper proposes a novel process for the pre-treatment of high phosphorus iron ore by pre-reduction, air jet milling and screening methods. The dephosphorization behavior was evaluated as a function of such parameters as the milling gas kinetic energy, E k and specific energy consumption, E sp. At a fixed milling gas kinetic energy, the ...
— The paper proposes the innovative technology of hydrogen mineral phase transformation–magnetic separation–acid leaching for iron enrichment and dephosphorization, based on the mineralogical characteristics of high phosphorus oolitic hematite and difficulties that make it difficult to utilize traditional beneficiation for …
The results showed that when the metallization ratio of pellets reached maximum (95%), the dephosphorization ratio was only 5.6%, thus indicating adverse result. The reduction processes of high-phosphorus iron ore under vacuum and nitrogen environment were, respectively, compared under the optimal condition.
tralian iron ore exists within iron minerals in the form of solid solution [1-2]. The dephosphorization of high phosphorus iron ores has been researched in a number of countries and a vari-ety of dephosphorization process has been developed for different phosphorus compounds. The dephosphorization of high phosphorus iron ores from the …
— In the present study, roasting-induced phase change and its influence on phosphorus removal via leaching has been investigated for high-phosphorus iron ore. The findings indicate that phosphorus in the ore is associated with goethite and exists mainly in amorphous Fe3PO7 phase. The phosphorus remains in the amorphous phase after …
— With the depletion of high-quality iron ore resources, high-phosphorus oolitic hematite (HPOH) has attracted great attention due to its large reserve and relatively high iron content. However, HPOH is very difficult to be used in ironmaking process due to its …
— Dephosphorization process of high phosphorus oolitic iron ore by acid leaching and leaching kinetics were investigated in the paper. The high phosphorus ore ... A process has been proposed for the treatment of apatite concentrate obtained from the dephosphorization of iron ore. In this process, the apatite is acidulated by HNO3 to …
— a project dissertation submitted to the school of postgraduate studies, ahmadu bello university, zaria. in partial fulfilment for the award of a doctor of philosophy (ph.d) in metallurgical and materials engineering. department of metallurgical and materials engineering faculty of engineering ahmadu bello university, zaria nigeria may, 2014.
— Phosphorous is an undesired element present in iron ore used in the steel making process. It leads to an increase in overall production cost as well as deteriorated steel quality. The desired phosphorus content in iron ores used in steel making is < 0.1%. Numerous beneficiation studies are mentioned in the literature; however, there is no …
— Alkali-leaching and acid-leaching were proposed for the dephosphorization of Changde iron ore, which contains an average of 1.12% for phosphorus content. Sodium hydroxide, sulfuriced, hydrochloric and nitric acids were used for the preparation of leach solutions. The results show that phosphorus occurring as apatite phase could be …
— Dephosphorization of Koton-karfe iron ore Kogi State, Nigeria has been studied. Sulphuric acid was used to leach 355 +250µm and -180 +125µm size fractions, the analysis was carried out using X–Ray fluorescence (XRF) Spectrometer andinductively-coupledplasma optical emission spectroscopy(ICP-OES). The leaching was conducted …
Alkali-leaching and acid-leaching were proposed for the dephosphorization of Changde iron ore, which contains an average of 1.12% for phosphorus content. Sodium hydroxide, sulfuriced, hydrochloric and nitric acids were used for the preparation of leach solutions. The results show that phosphorus occurring as apatite phase could be removed by alkali …
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— With the iron ore resource of easy processing decreased, a large amount of refractory iron ore has been mined. ... The method can efficiently extract iron and dephosphorization with a satisfactory Fe recovery and reduce the cost of smelting by reducing the P content from 0.95 % to 0.29 %. It has the worthwhile for application and …
DOI: 10.17580/or.2024.02.01 Corpus ID: 269666883; Combined processing and dephosphorization of brown iron ore of the Kokbulak deposit @article{Mukhtar2024CombinedPA, title={Combined processing and dephosphorization of brown iron ore of the Kokbulak deposit}, author={A. A. Mukhtar and A. S. Makashev and …
— The reduction roasting followed by magnetic separation process is considered to be a suitable method to treat the high-phosphorus oolitic iron ore. Currently, the dephosphorization mechanism of ...
— In this study, a high-phosphorus oolitic iron ore containing 44.70% Fe and 1.56% P from western Hubei of China was collected as the sample. The chemical composition, mineral composition, structure characteristics, dissemination characteristics, and iron and phosphorus occurrence state were carried out to investigate the …
— Deep dephosphorization of high‑phosphorus oolitic iron ore (HPOIO) is extremely difficult because of its refractory characteristics. A new approach for simultaneous iron recovery and dephosphorization from HPOIO by oxidation roasting – gas-based reduction (ORGR) and magnetic separation process was developed. The underlying …
— With the current tendency for development of a low-cost and eco-friendly process, dephosphorization of high-phosphorus iron ore through microbial process with three different sources of Aspergillus niger strains was studied in this study. Results show that the three strains of A. niger could grow well in the broth, and effectively remove ...
— The iron ore sample used in this study typically contained 0.126% phosphorus, was from the Pilbara region of Western Australia. After roasting at 1250, lump ore (P8o 5.6 mm), pellet 1 (grinding to -1.5 mm before pelletisation) and pellet 2 (grinding to -0.15 mm before pelletisation) were leached in solutions with different …
— In this study, direct reduction-magnetic separation process was applied to enrich phosphorus and iron to prepare Fe-P crude alloy from a high phosphorus oolitic hematite ore (HPOH). The results show that at lower temperatures and with absence of any of additives, Fe cannot be effectively recovered because of the oolitic structure is not …
— In this study, we presented simultaneous enrichment of iron (Fe) and phosphorus (P) to recover P from high-phosphorus iron ore and clarified the migration of …
— Oolitic brown iron ores are of great economic importance because of the vast reserves that exist in the world. However, their high phosphorus content has limited their use in metallurgy. Exciting enrichment methods are essentially unable to decrease the phosphorus content in such ore, since the phosphorus is present in embedded form as …
According to the mineral composition characteristics of high-phosphorus iron ore, the reaction mechanism of fluorapatite was investigated using pure substance and gangue under vacuum carbon thermal reduction (VCTR) conditions. The effects of reduction temperature, basicity, and C/O ratio on the metallization ratio, dephosphorization ratio, …
— Deep dephosphorization of high‑phosphorus oolitic iron ore (HPOIO) is extremely difficult because of its refractory characteristics. A new approach for simultaneous iron recovery and dephosphorization from HPOIO by oxidation roasting–gas-based reduction (ORGR) and magnetic separation process was developed.The underlying …
— The increasing demand for iron ore in the world causes the continuous exhaustion of magnetite resources. The utilization of high-phosphorus iron ore becomes the focus. With calcium carbonate (CaCO3), calcium chloride (CaCl2), or calcium sulfate (CaSO4) as additive, the process of direct reduction and phosphorus removal of high …
— The iron and phosphorus in high-phosphorus refractory iron ore were successfully recovered using coal-based reduction followed by magnetic separation and …
— A new iron recovery and dephosphorization approach from high‑phosphorus oolitic iron ore via oxidation roasting-gas-based reduction and magnetic separation …
— Separated preparation of prealloys and amorphous alloys results in severe solidification–remelting and beneficial element removal–readdition contradictions, which markedly increase energy consumption and emissions. This study offered a novel strategy for the direct production of FePC amorphous soft magnetic alloys via smelting reduction …
— High-phosphorus iron ore is traditionally dephosphorized by chemical process with inorganic acids. However, this process is not recommended nowadays because of its high cost and consequent environmental pollution. With the current tendency for development of a low-cost and eco-friendly process, dephosphorization of high …
— Brown iron ore constitutes about 13% of the global ore reserves and is widespread throughout the world. Brown iron ore is characterized by a significant content of harmful phosphorus (0.7 to 3.0%), which is typically present in the lattice of the main iron ore component in a chemically bound form. Based on the case study of the gravity …
— To understand the migration mechanisms of phosphorus (P) during coal-based reduction, a high-phosphorus oolitic iron ore was reduced by coal under various experimental conditions. The migration characteristics and kinetics of P were investigated by a field-emission electron probe microanalyzer (FE-EPMA) and using the basic …
— Abstract To comprehensively utilize Fe and P in oolitic hematite ore, an innovative method was proposed to enhance P enrichment in the reduced iron during the reduction process. The reduced iron was then converted to low-P-containing molten iron and high-P-containing slag in the presence of CaO–SiO2–FeO–Al2O3 slag. In this …
