Double slag operation dephosphorization in BOF for producing low phosphorus steel

Tian, Zhaopeng; Li, Benhai; Zhang, Xiaoming; Zhong-hang, Jiang

doi:10.1016/s1006-706x(09)60036-4

Cited by 42 publications

(31 citation statements)

References 5 publications

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“…Iron ores with phosphorus content lower than 0.07% P are commercially desired as they are suitable for use in iron production. As a consequence, a lot of research efforts have been focused on phosphorus removal from high-phosphorus iron ore [20,24,[32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48] in a bid to reduce the P content to acceptable levels. Processes that had been employed for phosphorus removal from iron ores include thermal treatment [7,21,24,[38][39][40][41][49][50][51][52][53], microwave treatment [38,[54][55][56], ultrasonic treatment [54], acid leaching [12,17,20,49,[56][57][58][59][60], alkaline leaching [5,59], bioleaching …”

Section: Introductionmentioning

confidence: 99%

Characterization studies on Agbaja iron ore: a high-phosphorus content ore

Ofoegbu

2019

SN Appl. Sci.

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Characterization of Agbaja iron ore was carried out using optical microscopy, scanning electron microscopy with energydispersive X-ray spectroscopy, X-ray fluorescence spectrometry, powder X-ray diffraction, thermal gravimetry, and differential scanning calorimetry. The ore consists of a matrix of gangue minerals composed principally of aluminosilicates and iron-rich concentric cored structures characteristic of oolitic ores. Chemical analyses of the ore indicate that it is principally composed of 53.1 wt% Fe, 1.395 wt% P, and aluminosilicates. The phosphorus associated with the ore was found to be present in both the iron-rich mineral(s) and the gangue minerals, indicating that beneficiation by elimination of gangue will have little effect on the percentage of phosphorus in the valuable mineral. Based on the results, it is postulated that phosphorus in Agbaja iron ore is most probably present in an amorphous phase and not as a component element of a distinct crystalline phase.

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Section: Introductionmentioning

confidence: 99%

Characterization studies on Agbaja iron ore: a high-phosphorus content ore

Ofoegbu

2019

SN Appl. Sci.

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“…The enrichment of vanadium is achieved by a two-step BOF blowing procedure of which the aim is to improve efficiency, reduce lime consumption and obtain a primary BOF slag with high vanadium concentration. The two-step BOF blowing procedure is similar to the de-Si and de-P methods described in the literature by Naito and Wakoh (2005) and Tian et al (2009). Hot metal from the BF, cooling scrap, iron ore pellets and fluxing agents are charged to the steelmaking vessel, i.e.…”

Section: Introductionmentioning

confidence: 99%

System analysis of slag utilisation from vanadium recovery in an integrated steel plant

Lundkvist¹,

Brämming

Larsson³

et al. 2013

Journal of Cleaner Production

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“…A similar finding was outlined for slag basicity such that basicity values greater than 6 were not advised. One of the most important conclusions of the paper was related to the steel tapping temperature; it was concluded that it was impossible to reach phosphorus content of less than 0.005% for crude steel when the tapping temperature was greater than 1943 K [39].…”

Section: New Trends Of Phosphorus Removal In Converter Steelmakingmentioning

confidence: 97%

New trends in basic oxygen furnace dephosphorization

Keskinkilic

2020

J min metall B Metall

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Except for special grades of steel where it is used as an alloying element, phosphorus is regarded as an impurity that must be removed. Considering the conventional integrated iron and steelmaking, there are primarily two processes for phosphorus removal. The first is a hot metal dephosphorization (DeP) process that is applied to a blast furnace for hot metal before the steelmaking process. The second is the basic oxygen furnace steelmaking (BOS), a unique method primarily used for steelmaking, with the exception of stainless steels. Hot metal phosphorus content has a direct impact on BOS. An increase of phosphorus in hot metal is mainly related to the use of high P 2 O 5 containing iron ores. In the current literature review, new trends of phosphorus removal in converter steelmaking are outlined. The double-slag practice was reported to be successful when hot metal P content was larger than 0.100%. It was indicated that the tapping temperature was critical for the production of low-phosphorus grades for which maximum allowable P content was 0.007% and that high tapping temperatures should be avoided. The tap-to-tap time for the double-slag process was slightly longer than the conventional converter steelmaking. It was further reported that the double-slag practice would be more economical than an establishment of a separate hot metal dephosphorization unit, if low-phosphorus grades did not have a significant share in the product mix of a steelmaking company. Endpoint phosphorus prediction was one of the important recent trends of converter steelmaking. A mixed injection of CO 2-O 2 to a basic oxygen furnace was applied to enhance dephosphorization, and promising results were reported. Unfortunately, a successful process for recycling of BOS dephosphorization slag has not been reported yet.

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Double slag operation dephosphorization in BOF for producing low phosphorus steel

Cited by 42 publications

References 5 publications

Characterization studies on Agbaja iron ore: a high-phosphorus content ore

Characterization studies on Agbaja iron ore: a high-phosphorus content ore

System analysis of slag utilisation from vanadium recovery in an integrated steel plant

New trends in basic oxygen furnace dephosphorization

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