dephosphorization of steel in ladle furnace

Dephosphorization - an overview ScienceDirect Topics

2012-01-05 Desulphurization is usually carried out at tapping and during ladle metallurgy, as in those stages the steel is deoxidized and the slag has high basicity and low oxygen potential (low content of oxidizing components, “FeO,” MnO, etc.).

Dephosphorization of Steels – IspatGuru

2016-08-15 (P content in ladle slag) + (P content in ladle steel) = (P content in tapped metal) + (P content in slag trapped by steel in ladle) + (P from deoxidizers). Phosphorus reaction and the thermodynamic equilibrium The initial comprehensive studies on dephosphorization were conducted during the 1940s.

Problems of Dephosphorization during Steelmaking ...

Abstract—The thermodynamics of tapping, dephosphorization, and out-of-furnace treatment of steel in a ladle and the related phosphorus balance are considered, and the main technological and thermodynamic parameters for decreasing the metal dephosphorization are found. SPELL: 1. slagless, 2. slagging

Study on the Dephosphorization of Semi-Steel in Ladle ...

Combined with converter semi-steel component of Chengde steel plant, the main components of 100t ladle dephosphorization slag were calculated to propose the initial ratio of dephosphorization slag composition. The dephosphorization slag composition was then further improved by induction furnace dephosphorization. Analysis of dephosphorization rules has

Simulation and Application of Top Lance with Various Tilt ...

The calculation area of the model included single-nozzle oxygen lance, molten bath, two bottom-blowing nozzles, and ladle furnace space from oxygen nozzle tip to molten steel surface. The model was built according to the 100 t dephosphorization ladle furnace. The five oxygen lances had the same parameters but different tilt angles.

Simulation and Application of Top Lance with Various Tilt ...

Compared with the 45° oxygen lance, the content of phosphorus in semi-steel B was decreased by 0.012 mass%, the dephosphorization rate was increased by 7.9% and the content of T. Fe loss was dropped by 1.9 mass%. It proved the oxygen lance with tilt angle could get a remarkable

“DEPHOSPHORIZATION OF STEEL PRODUCED FROM SPONGE

The present work is an attempt at dephosphorizing the steel produced in the induction furnace route from DRI which is high in phosphorous (upto 0.096% are common). A neutral lining is provided in the induction furnace and double slagging by the addition of Calcium Aluminate, Calcium Barium Aluminate and Barium Aluminate is adopted.

Ladle Metallurgy – IspatGuru

Dephosphorization in ladle is needed when the phosphorus content of input hot metal during primary steel making is high. Removal of phosphorus from the steel in the ladle is achieved by treating the steel with lime based oxidizing slags containing iron oxide.

Sumitomo Metals Realizes High Efficiency ... - Nippon Steel

Phosphorous contained in steel is a harmful impure substance that affects negatively to steel function in general. It affects the steel to lower hardness, degrade toughness, and weaken resistance to corrosion. Removal of phosphorous at low cost with minimal environmental load is an important issue in steelmaking.

NPTEL :: Metallurgy and Material Science - Steel Making

Electric Furnace Steelmaking; Development in EAF Steelmaking; Alternative Charge Materials in EAF; Stainless steel making; Emerging Steelmaking Technologies; Process Control BOF Steelmaking; Ladle Metallurgy. Evolution of ladle Treatment and Requirements ; Synthetic slag practice ; Injection ladle metallurgy ; Principles of Deoxidation ...

(PDF) Dephosphorization strategies and modeling in oxygen ...

relying on ladle furnace availability bec ... content in slag has shown a greater influence on dephosphorization for a given slag basicity and carbon content of steel. Dephosphorization has often ...

Study on the Dephosphorization of Semi-Steel in Ladle ...

Combined with converter semi-steel component of Chengde steel plant, the main components of 100t ladle dephosphorization slag were calculated to propose the initial ratio of dephosphorization slag composition. The dephosphorization slag composition was then further improved by induction furnace dephosphorization. Analysis of dephosphorization rules has been done.

NPTEL :: Metallurgy and Material Science - Steel Making

Electric Furnace Steelmaking; Development in EAF Steelmaking; Alternative Charge Materials in EAF; Stainless steel making; Emerging Steelmaking Technologies; Process Control BOF Steelmaking; Ladle Metallurgy. Evolution of ladle Treatment and Requirements ; Synthetic slag practice ; Injection ladle metallurgy ; Principles of Deoxidation ...

Ladle Refining Furnace - TurboSteel

Ladle refining of liquid metal is a proven technology to produce high quality steel. Ladle refining of liquid metal produces high quality steel and used for dephosphorization and desulphurisation in steel, remove other impurities and to obtain desired chemical composition in liquid steel. Ladle refining furnace facilitates higher productive time to the melting furnace besides producing better ...

CN105803155A - Dephosphorization method for electric-arc ...

The invention provides a dephosphorization method for electric-arc furnace steelmaking, and belongs to the field of electric-arc furnace steelmaking. The dephosphorization method is characterized in that the same spray gun is utilized for delivering oxygen gas, protective gas and carrier gas-dephosphorization powder into an electric-arc furnace molten pool directly, wherein the carrier gas ...

Comprehensive Solution of Refractory for Steel Iron Solution

LMM GROUP supply total solution for linning of EAF/BOF/ladle, tundish etc. from raw material selection, refractory portofio optimization, installation services recycle of used refractories on site to further reduce client’s Opex Capex in refractory consumption per ton steel

Steelmaking-Casting of Molten Steel by Decarburization ...

ResearchArticle Steelmaking-Casting of Molten Steel by Decarburization Ladle Matching WeiLiu ,1 XinfuPang ,2 ShengpingYu,1 CongxinLi,3 andTianyouChai1 ...

Technical Report Improvement in Hot-Metal Dephosphorization

pedo ladle cars (TPC-ORP), which uses highly basic slag, the de-phosphorization efficiency falls significantly without the use of fluo-rine. In converters, in contrast, high oxygen potential is maintained because of oxygen blowing at high speed, and dephosphorization progresses even with slag of low basicity (CaO/SiO 2), and thus the use of fluorine is not absolutely necessary. As a result of ...

Dephosphorization and Desulfurization of Molten Ductile ...

steel with additives that promote P2O5 in the slag. The most suitable way found is ladle treatment as we could not take risk to add additives in the furnace which may harm its lining. Previous Workings: We found from the literature that oxygen lancing with basic slag forming additives has very good results for the removal of the phosphorus from the steel. We also learned from the literature ...

The Necessity of Hot Metal Desiliconization Process ...

2011-01-01 Silicon content of hot metal in De-P furnace with phosphorous content of semi-steel less than 0.01% Initial conditions [P]_hm 0.1% [P]_sm 0.01% L P 150~200 Slag volume 45~60kg/t Basicity of slag 1.8 2 2.5 3 Silicon content of hot metal, % 0.52~0.7 0.47~0.63 0.38~0.50 0.31~0.42 That is to say, the good effects of dephosphorization can be obtained by controlling the silicon content of hot metal ...

Comprehensive Solution of Refractory for Steel Iron Solution

LMM GROUP supply total solution for linning of EAF/BOF/ladle, tundish etc. from raw material selection, refractory portofio optimization, installation services recycle of used refractories on site to further reduce client’s Opex Capex in refractory consumption per ton steel

Ladle Refining Furnace - TurboSteel

Ladle refining of liquid metal is a proven technology to produce high quality steel. Ladle refining of liquid metal produces high quality steel and used for dephosphorization and desulphurisation in steel, remove other impurities and to obtain desired chemical composition in liquid steel. Ladle refining furnace facilitates higher productive time to the melting furnace besides producing better ...

Steel - Ladle metallurgy Britannica

Steel - Steel - Ladle metallurgy: The carrying out of metallurgical reactions in the ladle is a common practice in practically all steelmaking shops, because it is cost-efficient to operate the primary furnace as a high-speed melter and to adjust the final chemical composition and temperature of the steel after tapping. Also, certain metallurgical reactions, for reasons of equipment design and ...

Melting of large steel casting parts in the induction furnace

Melting of large steel casting parts in the induction furnace by Wolfgang Ertl, ... ready for pouring directly in the steelworks at the ladle furnace and in a further sequence in the RH process. Fig. 3 shows the pouring from a 150 t-ladle in the foundry. Route 2: Here, according to pouring order, 15 to 50 t from the LD converter are diverted for the steel foundry. These partial taps are ...

CN105803155A - Dephosphorization method for electric-arc ...

The invention provides a dephosphorization method for electric-arc furnace steelmaking, and belongs to the field of electric-arc furnace steelmaking. The dephosphorization method is characterized in that the same spray gun is utilized for delivering oxygen gas, protective gas and carrier gas-dephosphorization powder into an electric-arc furnace molten pool directly, wherein the carrier gas ...

Steelmaking-Casting of Molten Steel by Decarburization ...

: Maximum number of optional ladle require-ments min: Minimum furnace optional ladle material requirements max: Maximum furnace optional ladle material requirements ( ):Ladlenumberofopenings min: Minimum number of optional ladle furnace requirements max: Furnace times the maximum number of optionalladles ( ):Numberofladles min

Tecnosulfur Desulfurization Process, dephosphorization ...

From the Dephosphorization Station, the pig iron goes to the converters or electric furnaces of the steel mill, where it is transformed into steel. From the converters or electric furnaces, the steel goes to the ladle furnace, to the bubbling station or to chemical heating, where the synthetic slag is applied as second refining and/or the micropulverized desulfurization agent is injected. The ...

Production of low phosphorus steels from high phosphorus ...

Indian context, dephosphorization of liquid steel can also not be considered because of its adverse effect on ladle refractories and steel cleanliness. For a large proportion of the steels made through the LD-slab caster-hot strip mill route at Tata Steel, the phosphorus content required in the product is 0'020% max and in some grades, it is restricted to 0.015 % max. Various control ...

RESEARCHES CONCERNING DEPHOSPHORIZATION PROCESS

This paper shows the results of researches concerning the steel dephosphorization processed in electric furnace EBT at steel shop no 2, SC Siderurgica Hunedoara. During researches it was recorded the phosphor content at each fabrication stage and the technological parameters. Processing the results it was obtain a series of correlations between the dephosphorization ratio and the technological ...

RECOMMENDED GUIDELINES FOR IRON STEEL SECTOR

dephosphorization by oxygen blowing along with iron ore/sinter is done into the ladle or torpedo with continuous deslagging. After the pre-treatment process , co-injection / mono-injection or stirring process is adopted for desulphurisation, slag skimming is done in Hot Metal ladles to ensure slag free metal for Primary steelmaking. In some of the old steel melt shops, hot metal transferred in ...

Ladle Refining Furnace - TurboSteel

Ladle refining of liquid metal is a proven technology to produce high quality steel. Ladle refining of liquid metal produces high quality steel and used for dephosphorization and desulphurisation in steel, remove other impurities and to obtain desired chemical composition in liquid steel. Ladle refining furnace facilitates higher productive time to the melting furnace besides producing better ...

Steelmaking-Casting of Molten Steel by Decarburization ...

When the furnace does not require dephosphorization, the direct-matching decarburization ladle is used; otherwise, the dephosphorization ladle followed by the decarburization ladle is considered. Decarburization ladle treatment affects furnace temperature and composition directly and furnace processing time indirectly, or essentially the entire production equipment schedule to avoid schedule ...

Problems of dephosphorization during steelmaking ...

2013-10-11 The thermodynamics of tapping, dephosphorization, and out-of-furnace treatment of steel in a ladle and the related phosphorus balance are considered, and the main technological and thermodynamic parameters for decreasing the metal dephosphorization are found.

China Customized Hot Metal Ladle 16 Tons For Steel Forging ...

Pre-dephosphorization of molten iron can be divided into outside furnace method and inside furnace method according to processing equipment. The equipment outside the furnace is a ladle and the torpedo tank. The equipment inside the furnace is a special furnace and a bottom-blown converter. According to the feeding method and the stirring ...

Common Misconceptions about Steel made through Arc

2020-08-27 The arc furnace can complete the dephosphorization by the furnace slag, which also allows for sufficient expansion for the deoxidation process. This is why the ability of the arc furnace to de-phosphorize is better than the induction furnace. Arc is preferred when phosphorus requirements are less than 0.015. As a general rule, arc furnaces are different from induction furnaces when it comes

Ladle Scientific.Net

Abstract: Combined with converter semi-steel component of Chengde steel plant, the main components of 100t ladle dephosphorization slag were calculated to propose the initial ratio of dephosphorization slag composition. The dephosphorization slag composition was then further improved by induction furnace dephosphorization. Analysis of dephosphorization rules has been done. The results show ...

CHARACTERIZATION OF LADLE FURNACE SLAG FROM THE

CMC Sisak d.o.o. steel mill has ladle furnace refining stations for secondary metallurgical processes. Knowledge of the chemical, mineralogical, morphological and toxicological properties of steel slags is essential because their physical, 356 chemical and mechanical properties, which play a key role in their utilization, are closely linked to these properties. Collecting of ladle furnace slag ...

Dephosphorization by Double-Slag Process in Converter ...

Double-slag process principle. The double-slag smelting process is a typical clean steel-production process. This technology can reduce the material consumption and the amount of final slag compared with conventional smelting [].The principle of the double-slag process is that the end-point slag remains and is solidified in the converter as dephosphorization slag feed to the next furnace.

Production of low phosphorus steels from high phosphorus ...

Indian context, dephosphorization of liquid steel can also not be considered because of its adverse effect on ladle refractories and steel cleanliness. For a large proportion of the steels made through the LD-slab caster-hot strip mill route at Tata Steel, the phosphorus content required in the product is 0'020% max and in some grades, it is restricted to 0.015 % max. Various control ...

RESEARCHES CONCERNING DEPHOSPHORIZATION PROCESS

This paper shows the results of researches concerning the steel dephosphorization processed in electric furnace EBT at steel shop no 2, SC Siderurgica Hunedoara. During researches it was recorded the phosphor content at each fabrication stage and the technological parameters. Processing the results it was obtain a series of correlations between the dephosphorization ratio and the technological ...