Optimization of Low Phosphorus Steel Production With Double Slag Process in BOF

2013 ◽  
Vol 20 (8) ◽  
pp. 41-47 ◽  
Author(s):  
Xiao Yang ◽  
Feng-mei Sun ◽  
Jin-li Yang ◽  
Fei Liu ◽  
Kui-sheng Cheng ◽  
...  
Keyword(s):  
Steel Production ◽  
Low Phosphorus ◽  
Phosphorus Steel ◽  
Double Slag

Research on Low-Phosphorus Steel Melting by Semi-Steel

2012 ◽  
Vol 557-559 ◽  
pp. 165-169
Author(s):  
Jun Chen ◽  
Xin Teng Liang ◽  
Jian Hua Zeng ◽  
Wei He
Keyword(s):  
Molten Iron ◽  
Steel Melting ◽  
Low Phosphorus ◽  
Phosphorous Content ◽  
Phosphorus Steel ◽  
Dephosphorization Rate ◽  
Double Slag ◽  
Content Alloy

In this study, double-slag method is used to melt low-phosphorous steel by semi-steel. The results show that, the average phosphorous content of the aimed molten iron of BOF is 0.0052% and after the first slag pure-out, the dephosphorization rate is 56.2%, while the total dephosphorization rate of BOF melting is 92.46%, rang from 91% to 93.4%. Low phosphorous content alloy and slag-stopping tapping technology is adopted and rephosphorization of molten iron is controlled in 0.002%. Finally the average phosphorous of the finished product is 0.0064%, range form 0.0055% to 0.0071%, which means that Pangang Group can produce the steel with phosphorous content is less than 0.008%.

Double slag operation dephosphorization in BOF for producing low phosphorus steel

2009 ◽  
Vol 16 (3) ◽  
pp. 6-14 ◽  
Author(s):  
Zhi-hong Tian ◽  
Ben-hai Li ◽  
Xiao-ming Zhang ◽  
Zhong-hang Jiang
Keyword(s):  
Low Phosphorus ◽  
Phosphorus Steel ◽  
Double Slag

scholarly journals Dephosphorization by Double-Slag Process in Converter Steelmaking

2018 ◽  
Vol 37 (7) ◽  
pp. 625-633
Author(s):  
Yang Wang ◽  
Shufeng Yang ◽  
Jingshe Li ◽  
Jie Feng ◽  
Feng Wang
Keyword(s):  
Production Efficiency ◽  
Smelting Process ◽  
Converter Steelmaking ◽  
Steelmaking Process ◽  
Key Factors ◽  
Iron Slag ◽  
Low Phosphorus ◽  
Dephosphorization Slag ◽  
Phosphorus Steel ◽  
Double Slag

AbstractThe double-slag converter steelmaking process can smelt low- and ultra-low-phosphorus steel and reduce lime and dolomite consumption and the amount of final slag simultaneously. Industrial steelmaking tests on a 150-metric ton converter at the Tangsteel Company were carried out to study this principle and its effect on the dephosphorization ratio and material consumption. The results showed that low-temperature stage could be used with a reduced amount of slag in the double-slag steelmaking process to achieve rapid and efficient dephosphorization. A low-basicity slag (~1.5–2.0) in the dephosphorization stage is required in double-slag process. The dephosphorization ratio reached a maximum of 71 % when the slag basicity was 1.7. The end-point phosphorus content after the smelting process was reduced from an average of 0.018 mass% to an average of 0.011 mass% and the dephosphorization efficiency increased by more than 6 %. The dephosphorization slag could be poured out rapidly when the FeO content was controlled at ~16–20 mass% in the double-slag smelting process. Based on key factors such as an efficient dephosphorization and a rapid iron–slag separation, the production efficiency was improved and the smelting cycle increased by only four minutes over the conventional process.

scholarly journals New trends in basic oxygen furnace dephosphorization

2020 ◽  
Vol 56 (1) ◽  
pp. 1-10
Author(s):  
E. Keskinkilic
Keyword(s):  
Phosphorus Removal ◽  
Basic Oxygen Furnace ◽  
Converter Steelmaking ◽  
Hot Metal ◽  
Basic Oxygen ◽  
P Content ◽  
Low Phosphorus ◽  
Unique Method ◽  
Dephosphorization Slag ◽  
Double Slag

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 P2O5 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 CO2-O2 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.

scholarly journals Development for the production of low phosphorus steel in operations at Arcelor Mittal Tubarão

2013 ◽  
Vol 49 (2) ◽  
pp. 85-91
Author(s):  
W. Luiz-Corrêa ◽  
H. Silva-Furtado ◽  
J. R. De Oliveira
Keyword(s):  
Low Phosphorus ◽  
Phosphorus Steel

scholarly journals ULTRA-LOW PHOSPHORUS STEEL GRADE PRODUCTION IN ONE BATCH BOF BOTTOM BLOWING PROCESS

2014 ◽  
Author(s):  
Henrique Silva Furtado ◽  
Tathagata Bhattacharya ◽  
Hoyong Hwang ◽  
Odair Jose Kirmse
Keyword(s):  
Steel Grade ◽  
Low Phosphorus ◽  
Bottom Blowing ◽  
Phosphorus Steel

scholarly journals Mechanical properties of low alloy high phosphorus weathering steel

2015 ◽  
Vol 51 (1) ◽  
pp. 81-87
Author(s):  
B.K. Jena ◽  
N. Gupta ◽  
B. Singh ◽  
G.S. Ahoo
Keyword(s):  
Phosphorus Content ◽  
Weathering Steel ◽  
Low Alloy Steels ◽  
Percentage Elongation ◽  
Brittle Rupture ◽  
Ductile Mode ◽  
Low Phosphorus ◽  
Optical Photomicrograph ◽  
Alloy Steels ◽  
Phosphorus Steel

Mechanical behaviour of two low alloy steels (G11 and G12) was studied with respect to different phosphorus contents. Tensile strength and yield strength increased while percentage elongation at fracture decreased on increasing phosphorus content. The SEM and light optical photomicrograph of low phosphorus steel (G11) revealed ferrite and pearlite microstructure. On increasing phosphorus content from 0.25 wt.% to 0.42 wt.%, the morphology of grain changed from equiaxed shape to pan-cake shape and grain size also increased. The Charpy V notch (CVN) impact energy of G11 and G12 steel at room temperature was 32 J and 4 J respectively and their fractographs revealed brittle rupture with cleavage facets for both the steels. However, the fractograph of G11 steel after tensile test exhibited ductile mode of fracture with conical equiaxed dimple while that of G12 steel containing 0.42 wt. % P exhibited transgranular cleavage fracture. Based on this study, G11 steel containing 0.25 wt. % P could be explored as a candidate material for weathering application purpose where the 20?C toughness requirement is 27 J as per CSN EN10025-2:2004 specification.

Drying and heating of scrap metal at steelmaking: industrial safety, economics, ecology

2020 ◽  
Vol 76 (12) ◽  
pp. 1353-1258
Author(s):  
V. A. Spirin ◽  
V. E. Nikol’skii ◽  
D. V. Vokhmintsev ◽  
A. A. Moiseev ◽  
P. G. Smirnov ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
High Efficiency ◽  
Steel Production ◽  
Scrap Metal ◽  
Industrial Safety ◽  
Technical Solution ◽  
Metal Charge ◽  
Basic Task ◽  
Scrap Heating ◽  
Winter Time

At steel production based on scrap metal utilization, the scrap heating before charging into a melting facility is an important way of energy efficiency increase and ecological parameters improving. In winter time scrap metal charging with ice inclusions into a metal melt can result in a considerable damage of equipment and even accidents. Therefore, scrap preliminary drying is necessary to provide industrial safety. It was shown, that in countries with warm and low-snow climate with no risk of scrap metal icing up during its transportation and storing in the open air, the basic task being solved at the scrap drying is an increase of energy efficiency of steelmaking. InRussiathe scrap metal drying first of all provides the safety of the process and next - energy saving. Existing technologies of scrap metal drying and heating considered, as well as advantages and drawbacks of technical solutions used at Russian steel plants. In winter time during scrap metal heating at conveyers (Consteel process) hot gases penetrate not effectively into its mass, the heat is not enough for evaporation of wetness in the metal charge. At scrap heating by the furnace gases, a problem of dioxines emissions elimination arises. Application of shaft heaters results in high efficiency of scrap heating. However, under conditions of Russian winter the upper scrap layers are not always heated higher 0 °С and after getting into a furnace bath the upper scrap layers cause periodical vapor explosions. The shaft heaters create optimal conditions for dioxines formation, which emit into atmosphere. It was shown, that accounting Russian economic and nature conditions, the metal charge drying and heating in modified charging buckets by the heat of burnt natural gas or other additional fuel is optimal. The proposed technical solution enables to burnt off organic impurities ecologically safely, to melt down ice, to evaporate the wetness in the scrap as well as to heat the charge as enough as the charging logistics enables it. The method was implemented at several Russian steel plants. Technical and economical indices of scrap metal drying in buckets under conditions of EAF-based shop, containing two furnaces ДСП-100, presented.

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