— 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.

 — ABSTRACT 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 additives such as CaCO3, Ca(OH)2, Na2SO4, and Na2CO3 on the reduction roasting of the iron ore in which phosphorus occurs in apatite …

 — The roasting -leaching technology for iron extraction and phosphorus reduction was proposed with a view to achieving efficient utilization of high-phosphorus …

 — 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 …

 — A new iron recovery and dephosphorization approach from high‑phosphorus oolitic iron ore via oxidation roasting-gas-based reduction and magnetic separation …

 — 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 …

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.

An attempt has been made in this study to optimize the process variables for the dephosphorization of iron ore using nitric acid. Standard central composite design with 2 full factorial was used to develop the model. The model was optimized using

 — Coal-based reduction followed by magnetic separation is an effective way to recover iron from high phosphorus-containing oolitic hematite ore. Given that high quantities of dephosphorization agent are needed to obtain low phosphorus reduced iron, a novel approach is proposed by the authors. Without prior phosphorus removal, the …

 — 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 …

 — 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 …

 — 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 …

 — 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 …

 — 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 …

 — The effect of CaCO 3, Na 2 CO 3, and CaF 2 on the reduction roasting and magnetic separation of high-phosphorus iron ore containing phosphorus in the form of …

 — 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 …

 — 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 …

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 …

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 iron and phosphorus in high-phosphorus refractory iron ore were successfully recovered using coal-based reduction followed by magnetic separation and …

 — 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 …

 — 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 …

 — 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 …

 — 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 …

 — As the lacking of high-quality iron ore is increasingly serious, the refractory mineral resources with medium and high content of phosphorus are progressively investigated due to the rich storage [1,2,3].However, almost all the phosphorus will enter into hot metal during ironmaking process, which leads to the high phosphorus content in …

 — Without prior phosphorus removal, the phosphorus was enriched in the reduced iron during a reduction process, then high-phosphorus reduced iron was refined to low phosphorus molten iron and …

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 HNO 3 to produce high-purity H 3 PO 4.The crude acid obtained is shown to be at least equivalent to, if not better than, the typical wet-process acid.

 — 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 …

 — Editors select a small number of articles recently published in the journal that they believe will be particularly interesting to readers, or important in the respective research area. The aim is to provide a snapshot of some of the most exciting work published in the various research areas of the journal.

 — The technology of direct reduction by adding sodium carbonate (Na 2 CO 3) and magnetic separation was developed to treat Western Australian high phosphorus …