Effect of calcium compounds on direct reduction and
direct reduction dephosphorization in high-phosphorus iron ore. 2 Materials and methods 2.1 Materials The high-phosphorus iron ore came from a mine in Africa, and was referred to as raw ore. The iron grade and phosphorous content were 55.58% and 0.57%, respectively, and the main iron minerals were hematite and magnetite. 48.61% of phosphorus
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Comprehensive Utilization of Iron and Phosphorus from High
The iron and phosphorus in high-phosphorus refractory iron ore were successfully recovered using coal-based reduction followed by magnetic separation and the dephosphorization process. The total recoveries of Fe and P were 84.41% and 67.23%, respectively. This process represents an effective approach to the utilization of high …
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Reduction in fossil fuel consumption by exploiting separation of
The magnetite concentrate generated from oolitic iron ore ... Iron recovery and dephosphorization reached 68.70% and 93.50%, respectively. In a weak reducing atmosphere, apatite was not reduced. A portion of the phosphorus in the iron minerals formed apatite, and the remaining phosphorus entered fayalite. Metallic iron and …
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Selective Liberation of High-Phosphorous Oolitic Hematite
Oolitic hematite ore was collected from the western part of Hubei Province, China. The chemical composition, iron phase and phosphorus phase of this ore are presented in Table 1 and Table 2, respectively. The total Fe and phosphorus grade were 43.31% and 1.49%, respectively. The main valuable mineral was hematite, which was …
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Dephosphorization of high phosphorus oolitic hematite by acid …
DOI: 10.1016/J.HYDROMET.2017.04.015 Corpus ID: 100431777; Dephosphorization of high phosphorus oolitic hematite by acid leaching and the leaching kinetics @article{Wang2017DephosphorizationOH, title={Dephosphorization of high phosphorus oolitic hematite by acid leaching and the leaching kinetics}, author={Heng …
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An alternative and clean utilisation of refractory high-phosphorus
Experimental results show that the iron concentrate with total iron grade of 61.78% and phosphorus content of 0.23% was obtained from an oolitic hematite ore containing 47.71% iron and 0.874% ...
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A new iron recovery and dephosphorization approach from
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 …
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A new way to efficient utilization of eggshell waste: As green
Reduction roasting of high-phosphorus oolitic iron ore (HPOIO) requires the addition of expensive alkali metal compounds to enhance dephosphorization. In this paper, the eggshell waste from the catering industry was used to replace traditional dephosphorization agents, which not only avoided environmental problems caused by …
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Effect of additives on iron recovery and dephosphorization by reduction
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 Fe 3 PO 7 and apatite was investigated. The results revealed that Na 2 CO 3 had the most significant effect on iron recovery and dephosphorization, followed by CaCO 3, the …
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Effects of sodium salts on reduction roasting and Fe–P …
Reduction roasting of high-phosphorus oolitic iron ore (HPOIO) requires the addition of expensive alkali metal compounds to enhance dephosphorization. In this paper, the eggshell waste from the catering industry was used to replace traditional dephosphorization agents, which not only avoided environmental problems caused by …
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Dephosphorization Treatment of High Phosphorus Oolitic Iron Ore …
The dephosphorization of high phosphorus iron ore has been researched in many countries, such as physical separation, 6,7,8,9,10) bio-leaching, 11,12) flotation, 13,14) hydrometallurgical process. 15,16) But the oolitic structure of the ore prevents the effective use of physical concentration and flotation separation, and necessitates the use ...
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Studying on mineralogical characteristics of a refractory high
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 …
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A new iron recovery and dephosphorization approach from
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 …
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A new way to efficient utilization of eggshell waste: As green
The cleaning and efficient disposal of eggshell waste presents many challenges. Reduction roasting of high-phosphorus oolitic iron ore (HPOIO) requires the addition of expensive alkali metal compounds to enhance dephosphorization.In this paper, the eggshell waste from the catering industry was used to replace traditional …
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Selective Reduction of Iron and Phosphorus from Oolitic Ore
The maximum phosphorus content in iron-ore concentrate for ore processing in a blast furnace is limited to 0.3 wt % by existing standards [1–5]. There are several dephosphorization approaches of oolitic ore and its concentrate, which are based on physical, chemical, and combined methods of exposure on oolitic ore particles.
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A novel direct reduction-flash smelting separation
To provide a new method for the dephosphorization of high-phosphorus oolitic iron ore (HPOIO) by reduction roasting, the feasibility of the high-efficiency …
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Effect of Raw Material Particle Size on the Direct Reduction
To investigate the effect of simultaneous change in particle size of raw materials (including ore, reductant, and dephosphorization agent) on the direct reduction process of high-phosphorus oolitic hematite, the experimental research of method with direct reduction and magnetic separation was conducted to investigate the effect of …
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A review on the characterisation and processing of oolitic iron …
To provide a new method for the dephosphorization of high-phosphorus oolitic iron ore (HPOIO) by reduction roasting, the feasibility of the high-efficiency …
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A new iron recovery and dephosphorization approach from
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 …
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A new iron recovery and dephosphorization approach from
In this study, an oolitic iron ore was isothermally reduced by coal at 1423 K-1573 K, and the reduction kinetics and mechanisms were investigated using the …
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Phosphorus reduction behavior of high-phosphate iron ore during
With apatite reduction, the metal iron accumulates, and part of the reduced phosphorus gas is absorbed by the metal iron to form stable iron—phosphorus …
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Recovery of iron from high phosphorus oolitic iron ore using coal …
Oolitic iron ore is one of the most important iron resources. This paper reports the recovery of iron from high phosphorus oolitic iron ore using coal-based reduction and magnetic separation. The influences of reduction temperature, reduction time, C/O mole ratio, and CaO content on the metallization degree and iron recovery were …
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Resource-saving production of Fe-based amorphous alloys from
Due to the complex mineral phase structure, the dephosphorization of high-phosphorus oolitic iron ore is quite difficult [3], which limits the wide applications in iron and steel metallurgy, because the high P content will lead to "cold brittleness" [22]. However, high-phosphorus oolitic iron ore with high P content is an ideal raw material ...
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Dephosphorisation of high phosphorus oolitic hematite by carbon
High phosphorus oolitic hematite deposit is a kind of refractory iron ore resource of huge amount. At present, it is difficult to be utilised by traditional physical and chemical technology efficiently and economically. A novel process for utilisation of the high phosphorus oolitic hematite based on carbon composite pre-reduction and fast melting …
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Oolitic ironstones
ISOTOPIC SIGNATURES: Siderite has light C, about -18 per mil; unknown for other minerals (Maynard, 1983). STRUCTURAL SETTING: Major deposits in undeformed to simply folded strata. Some Ordovician deposits on blocks complexly deformed by the Armorican (Hercynian) orogeny of Western Europe. ORE DEPOSIT GEOMETRY: …
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Dephosphorization behavior of reduced iron and the …
In normal practice, dephosphorization reagents, such as sodium carbonate, sodium sulfate, and borax, are added to oolitic hematite ore during the reduction process, and the reduction temperature is controlled …
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Selective Reduction of Iron and Phosphorus from Oolitic Ore
The possibility of selective solid-phase reduction of iron from oolitic ore has been experimentally confirmed. Solid phase reduction was carried out at temperatures of …
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Influence of Sodium Salts on Reduction Roasting of High …
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 …
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(PDF) Flotation Dephosphorization of High-Phosphorus Oolitic Ore
A lab-made fatty acid was identified as an effective collector for high-phosphorus oolitic hematite, resulting in a product containing 57.67% iron and 0.14% phosphorus with a flotation recovery ...
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Dephosphorization of high phosphorus oolitic hematite by acid …
Most of the earlier studies on dephosphorization by acid leaching were conducted to study the effect of time, temperature, acid concentration, etc. (Xia et al., 2011, Yu and Muhammed, 1990) The leaching kinetics of the high phosphorus oolitic iron ore was rarely investigated, except for the H 2 SO 4 leaching kinetics of the typical oolitic …
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