Yang et al. studied roasting-induced phase changes and their influence on phosphorus removal by acid leaching of an iron ore with an average phosphorus content 0.85 wt.% (Huimin iron ore from Huimin County, Yunnan Province, China). They reported that while iron presented as hematite and goethite in the as-is ore with the non …
Phosphorus is one of the most deleterious elements in iron ore as it follows iron during downstream reduction processes, forming iron phosphides that make steel brittle. Excess phosphorus increases the cost of steelmaking and the steel industry has placed an upper limit of 0.07–0.08 wt-% P on the iron ore feed.
They evaluated the reduction of the phosphorus content of a Brazilian iron ore with an initial phosphorus content of 0.82%. The best result was obtained with dodecyl amine (approximately of floatability) in pH 8. A concentrate containing 0.201% phosphorus, 62.31% mass recovery was obtained at a dosage of 150g/t of Flotigam EDA (etheramine ...
P content in iron ore production is ≈0.07 - 0.08 wt per cent (ie 700 - 800 ppm) (Cheng et al, 1999; Thorne et al, 2008), with penalties for every 0.001 per cent increase in P content above
The process schematic overall is that SSAB receives rather low phosphorus iron ore and ... adjusting the stea l quality to fina l limits. ... The low phosphorus content is necessary for high ...
The phosphorus content of the banded iron formation (BIF) and of the associated iron ore deposits in the north west of Western Australia is known to vary widely, a fact which has considerable econ~mic significance. Trendall and Blockley (1970) have described the variety of textural appearances of apatite in the Hamersley Group BlF, and suggest that …
The reduction of phosphorus content at the concentrate of some iron ore mines in Mexico, Sweden and Iran, where the apatite is the main phosphorous mineral, can be easily reached through anionic flotation with fatty acids collectors to float the apatite when sodium silicate is used to depress the iron oxides (Subramanian et al., 2002, …
In this study, we presented simultaneous enrichment of iron (Fe) and phosphorus (P) to recover P from high-phosphorus iron ore and clarified the …
Excess phosphorus increases the cost of steelmaking and the steel industry has placed an upper limit of 0.07-0.08 wt-% P on the iron ore feed. Goethite grains …
The efficient development and utilization of high-phosphorus oolitic hematite is of great strategic significance for the sustainable supply of iron-ore resources in China. In this paper, the mechanism of high-temperature pretreatment for enhancing the effect of iron enrichment and dephosphorization in the magnetization roasting-leaching …
High-phosphorus iron ore resource is considered a refractory iron ore because of its high-phosphorus content and complex ore phase structure. Therefore, the development of innovative technology to realize the efficient utilization of high-phosphorus iron ore resources is of theoretical and practical significance. Thus, a method for …
Keywords High-phosphorus iron ore · Characterization · Beneciation · Phosphorus removal 1 Introduction Iron ore is the essential raw material from which metallic iron is extracted. The Fe content in the ore should be at least 25 wt% so that it can be used for steel production. Never-theless, iron ore with an Fe content of less than 25% can be
(0.9% in raw iron ore vs. 0.28% in pig iron), the molten iron was still not satisfied with the requirement of steelmaking. External dephosphorization of hot metal by its remanent
Current specifications for phosphorus in iron ore require ores averaging less than 0.07–0.08 wt-% P (Cheng et al., 1999, Thorne et al., 2008), with penalties for …
Iron ore in Australia is predicted to increase in its phosphorus content in the near future, which is detrimental to properties of steel product. Steelmakers are concerned by the content of phosphorus in iron ore will exceed limits for steelmaking and increase the converter slag ratio to molten steel, which will finally lead to a decline in competitiveness …
This paper aims at reviewing literature on the occurrence of phosphorus in iron ores from the mines around the world. The review extends to the phosphorus removal processes of this mineral to meet the specifications of the steel industry. Phosphorus is a contaminant that can be hard to remove, especially when one does not know its mode of …
This research aims to make a preliminary study of wavellite's floatability and to evaluate the reduction of phosphorus content by froth flotation from a Brazilian iron ore with a P content of 0.82%.
Effective phosphorus removal procedures from high-phosphorus iron ores are very likely to be ore-specific due to the significant variations in ore compositions, and to the presentation of …
The iron ore reserves of 3.72 billion tons, account for approximately 73.5% of the sedimentary iron ore in China (Lu et al., 1994). The high phosphorus oolitic hematite has the characteristics of low-grade iron content and high-level harmful impurities, such as phosphorus and aluminium (Wei, 2010), which limit the development of this oolitic ...
the reduction of the phosphorus content in iron ore particles. Keywords: Microwave, Leaching, Reduction of phosphorus, Iron ore. 1. Introduction Iron ore is the most widely mined mineral resource ...
element in the ore was iron, the content of total iron was 42.21%, the content of Fe 2O3 was 55.51%, the content of FeO was 4.31%, and the content of phosphorus was as high as 1.31%.
Investigation of phosphorus associations seen in Brockman Iron Ore Formation, Australia, shows that phosphorus occurs in three main forms, (Wells and Ramanaidou, 2011). The first one is secondary apatite, the second one, accounting for a very modest amount of total phosphorus content, is occurring in other sub-micrometric …
Phosphorus is one of the most deleterious elements in iron ore as it follows iron during downstream reduction processes, forming iron phosphides that make steel brittle. Excess phosphorus increases the cost of steelmaking and the steel industry has placed an upper limit of 0.07-0.08 wt-% P on the iron ore feed. Goethite grains containing high levels of …
Some of the important results are summarized as follows: (a) Phosphorus content in the leached ore could be decreased to a level below the set limit. The extent of the phosphorus removal is 95%. (b) The relative …
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 …
Phosphorus is a major contaminant in steelmaking and current specifications for iron ore, the feedstock used in steelmaking, requires ores averaging less than 0.08% P (bulk). In Australia, the majority of iron ore feedstock production is a blend of low-P (<0.05% P) hematite-rich ores and more common high-P (>0.10% P) goethite-rich ores.
Although its iron content is about 47.50% (Obot and Anyakwo, 2011) but its phosphorus content is variously estimated at about 1.4 to 2.0%(Obiorah et al,2011).Since phosphorus beyond the threshold ...
Iron ore having high-sulfur content causes problems in the concentrate production, pelletizing, and steel-making processes and environmental issues such as sulfur dioxide emission during 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 …
Nutrient manipulation of low-phosphorus soil in an old growth Amazon rainforest shows that phosphorus availability drives forest productivity and is likely to limit theresponse to increasing ...
High iron and low phosphorus content in the concentrate with high iron recovery could be obtained by the combination of reduction and magnetic separation.[9,10] In addition, Yu et al. investigated how alkaline additives such as Ca(OH) 2 and Na 2 CO 3 used in the carbothermic reduction of high-phosphorus iron ore positively affected …
High-phosphorus is a typical refractory iron ore that has not been effectively utilized owing to its low Fe grade, fine embedded particle size, and high phosphorus content(Cao, 2023b; Peng et al., 2017; Wu …
Direct reduction (DR) nowadays relies on high-grade iron ores, characterized by a high total iron content and low contents of tramp elements. Since …
Unbeneficiated magnetitic iron ore was used in this study; the relatively high phosphorus content facilitates the detection via scanning electron microscope with energy-dispersive X-Ray spectroscopy (SEM-EDS). Table 1 shows the chemical composition of the raw and oxidized samples. A lump sample with grain sizes between …
Steelmakers are concerned by the content of phosphorus in iron ore will exceed limits for steelmaking and increase the converter slag ratio to molten steel, which will finally lead …
