rapid dephosphorization of steel
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rapid dephosphorization of steel

Dephosphorization - an overview ScienceDirect Topics

Jan 05, 2012  Since 1987, many steelmaking plants in Japan had been concerned about the hot metal dephosphorization pretreatment in the converter and had made rapid progress on this technology. Different technological conditions and product requirements in steelmaking plants led to different dephosphorization pretreatment approaches, as shown in Fig. 6.57, from which we can see that the dephosphorization

Dephosphorization of Steels – IspatGuru

Aug 15, 2016  The initial comprehensive studies on dephosphorization were conducted during the 1940s. These studies observed that FeO and CaO are necessary slag constituents for the dephosphorization of steel. These studies also showed that the dephosphorization reaction is exothermic and that the slag capacity for dephosphorization decreases with temperature.

Knowledge of Dephosphorization - Permanent Steel

Dephosphorization refers to a chemical reaction that reduces the amount of phosphorus in molten steel. Phosphorus is a harmful element in most steel grades and is easily segregated at grain boundaries, causing low temperature brittleness and temper brittleness of steel. ... with the rapid development of science and technology, users ...

Dephosphorization ofStainless Steels

Dephosphorization ofStainless Steels N. SANO* and H. KATAYAMAt 'TheUniversity a/Tokyo, Tokyo, Japan tTee/mical Development Bureau, Nippon Steel Corporation, Tokyo, Japan After briefly describing the importance of the dephosphorization of stainless steels from the viewpoint of their corrosion resistance, as well as their production methods,

Technical Report Improvement in Hot-Metal Dephosphorization

As a result of the rapid development and expansion of hot-metal pretreatment making use of the advantages of converters since the 1990s, 95% of the molten pig iron of the company undergoes the converter-type dephosphorization as of early 2012.15) This paper reports the evaluation of the dephosphorization char-

Dephosphorization of Iron Ore Bearing High Phosphorous by ...

The crude steel production of China had reached 626 mil- ... The dephosphorization process for high phosphorous iron ores has been studied for many years all over the world. Typical methods includes benefication,2–5) ... The characters of selective and rapid heating of microwave

(PDF) Modelling of Dephosphorization in Oxygen Steelmaking

A rapid dephosphorization at the beginning and followed by a reversal back to the hot metal after equilibrium has been reached was observed by the above workers.

(PDF) Dephosphorization of Steelmaking Slag

Generation rate of Steelmaking (LD) slag is 150-180 kg per ton of steel. It contains desirable substances like CaO (45-50%), Fe (15-20%). Although, blast furnace slag has long term market in ...

Investigations of the Dephosphorization of Liquid Iron ...

stainless steel production—aiming at the reduction of production costs—substitute steel scrap by hot metal coming from the reduction of iron-chromium ores, which requires more extensive dephosphorization. For the dephosphorization of a liquid iron solution containing chromium, the slag should exhibit good

Why should dephosphorization of molten iron in the ...

In recent years, with the rapid development of clean steel production processes, the demand for low-phosphorus steel has been proposed. ... At present, the dephosphorization process of molten iron actually put into production in China mainly includes two types: dephosphorization outside the furnace and dephosphorization in the furnace.

(PDF) Modelling of Dephosphorization in Oxygen Steelmaking

A rapid dephosphorization at the beginning and followed by a reversal back to the hot metal after equilibrium has been reached was observed by the above workers.

Dephosphorization of Iron Ore Bearing High Phosphorous by ...

The crude steel production of China had reached 626 mil- ... The dephosphorization process for high phosphorous iron ores has been studied for many years all over the world. Typical methods includes benefication,2–5) ... The characters of selective and rapid heating of microwave

Dephosphorization by Double-Slag Process in Converter ...

The 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.

Strengthening mechanism of steels treated by barium ...

Jun 01, 2008  The deoxidation, desulfurization, dephosphorization, microstructure, and mechanical properties of steels treated by barium-bearing alloys were investigated in laboratory and by industrial tests. ... which easily float up from molten steel, leading to the rapid decrease in total oxygen content to a very low level. (2) Barium has strong ...

Steelmaking - University of Pittsburgh

2.3.1 Slag composition for dephosphorization of steel melts 2.3.2 Continuous measurements of dissolved oxygen in steel melts 2.4 2.4.1 2.4.2 2.5 2.6 3. 3.1 ... in steel melts: calcium solubility of steel melts in equili­ ... rapid estimation of the effects of changes in composition and tem­ ...

Investigations of the Dephosphorization of Liquid Iron ...

Dephosphorization of hot metal with chromium or steel-containing chromium may be carried out in oxidative conditions at relatively high oxygen potential or also in reductive. In oxidative dephosphorization, the slags should have higher basicity and sufficient phosphate capacity.

Optimizing Refining Process (LD-ORP): Part One :: Total ...

As stated above, hot-metal pretreatment methods taking advantage of converters showed rapid advances since the 1990s, and as a result, the shares of the LD-ORP and MURC processes in hot-metal dephosphorization increased, replacing conventional processes using torpedo ladle cars or hot-metal ladles, as seen in Figure 2.

Role of Slag in Converter Steelmaking – IspatGuru

Aug 01, 2015  For the dephosphorization slag plays an important role in the oxygen converter steelmaking. The balance of oxygen activity in the steel and slag can be related in the oxidation phase as well as materials being used for dephosphorization. The equation of removing phosphorous from the steel is in simple terms is as follows.

Application practice of BOF Slag tailings in steelmaking ...

Steelmaking, slag tailings, dephosphorization, utilization . 1. Introduction With the rapid development of iron and steel enterprise and continuous expansion of iron and steel company scale, Ansteel enterprise is transforming to an enterprise of large-scale, benefitial, environmental protection, as well as

Dephosphorization of Molten Pig Iron Containing Chromium ...

been made on the dephosphorization of molten steel or iron containing chromium by adding such fluxes as Na2C03,1~ Ca-CaF2,7-9) CaC2 CaF2,1°-12) CaO-FeC12,13~ CaC2,14~ or Ca.15~ These studies can generally be classified into the following two; reducing dephosphorization and oxidizing dephosphorization methods.

Behavior of phosphorus enrichment in dephosphorization ...

Jan 07, 2020  Abstract: At low basicity and low temperature, the dephosphorization behavior and phosphorus distribution ratio (L P) between slag and molten steel in the double slag and remaining slag process were studied with a 180 t basic oxygen furnace industrial experiment.The dephosphorization slags with different basicities were quantitatively analyzed. At the lower basicity range of 0.9–2.59,

Technical Review UDC 669 . 184 . 244 . 66 ... - Nippon Steel

tage of converters showed rapid advances since the 1990s, and as a result, the shares of the LD-ORP and MURC processes in hot-metal dephosphorization increased, replacing conventional processes us-ing torpedo ladle cars or hot-metal ladles, as seen in Fig. 2. As of the beginning of 2012, the converter dephosphorization methods are

Dephosphorization by Double-Slag Process in Converter ...

The 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.

Behavior of phosphorus enrichment in dephosphorization ...

Jan 07, 2020  Abstract: At low basicity and low temperature, the dephosphorization behavior and phosphorus distribution ratio (L P) between slag and molten steel in the double slag and remaining slag process were studied with a 180 t basic oxygen furnace industrial experiment.The dephosphorization slags with different basicities were quantitatively analyzed. At the lower basicity range of 0.9–2.59,

Application practice of BOF Slag tailings in steelmaking ...

Steelmaking, slag tailings, dephosphorization, utilization . 1. Introduction With the rapid development of iron and steel enterprise and continuous expansion of iron and steel company scale, Ansteel enterprise is transforming to an enterprise of large-scale, benefitial, environmental protection, as well as

Dephosphorization of Molten Pig Iron Containing Chromium ...

been made on the dephosphorization of molten steel or iron containing chromium by adding such fluxes as Na2C03,1~ Ca-CaF2,7-9) CaC2 CaF2,1°-12) CaO-FeC12,13~ CaC2,14~ or Ca.15~ These studies can generally be classified into the following two; reducing dephosphorization and oxidizing dephosphorization methods.

Investigations of the Dephosphorization of Liquid Iron ...

Dephosphorization of hot metal with chromium or steel-containing chromium may be carried out in oxidative conditions at relatively high oxygen potential or also in reductive. In oxidative dephosphorization, the slags should have higher basicity and sufficient phosphate capacity.

STEELUNIVERSITY BASIC OXYGEN STEELMAKING IMULATION

2.2.2 Dephosphorization Kinetics During Post-Blow Stir The rate at which the steel is dephosphorized during the post-blow stirring with e.g. nitrogen or argon is controlled by where k c = mass transfer coefficient of P in molten steel A = cross sectional area at the slag-metal interface (m2) V = steel volume (m3) %P = P content in the steel at ...

Optimizing Refining Process (LD-ORP): Part One :: Total ...

As stated above, hot-metal pretreatment methods taking advantage of converters showed rapid advances since the 1990s, and as a result, the shares of the LD-ORP and MURC processes in hot-metal dephosphorization increased, replacing conventional processes using torpedo ladle cars or hot-metal ladles, as seen in Figure 2.

Optimizing Refining Process (LD-ORP): Part One Total ...

As stated above, hot-metal pretreatment methods taking advantage of converters showed rapid advances since the 1990s, and as a result, the shares of the LD-ORP and MURC processes in hot-metal dephosphorization increased, replacing conventional processes using torpedo ladle cars or hot-metal ladles, as seen in Figure 2.

(PDF) Strengthening mechanism of steels treated by barium ...

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The Oxygen Steelmaking Process: Part One :: Total Materia ...

The oxygen steelmaking process is a generic name given to those processes in which gaseous oxygen is used as the primary agent for autothermic generation of heat as a result of the oxidation of dissolved impurities like carbon, silicon, manganese and phosphorus and to

BENEFICIATION, DEPHOSPHORIZATION AND DESULPHURIZATION OF ...

beneficiation, dephosphorization and desulphurization of Agbaja iron ore. The raw ore was beneficiated using several techniques namely; oil agglomeration technique, rapid magnetic separation technique, Humphrey spiral technique, froth flotation technique and jigging table technique. Chemical leaching, bacteria leaching and

(PDF) Dephosphorization Treatment of High Phosphorus Iron ...

Dephosphorization Treatment by Pre-reduction, ples. An accelerating voltage of 20 kV and magnification Mechanical Crushing and Screening Methods 2 000 was used to perform qualitative and semi-quantitative The dephosphorization treatment of high phosphorus chemical analysis of the mounted iron ore samples.

Simulation and Modelling of Metallurgical Processes in ...

Due to the rapid development in computer technologies during the last two ... dephosphorization, size and composition of inclusion in steel, slag entrainment, flowpatterninSEN’s,reconstructionofdendrites,stress-strainduringcontinuous casting, centreline segregation, thermoelastic properties, phase transformations, ...

Simulation and Modelling of Metallurgical Processes in ...

Aug 12, 2010  The selected papers cover topics like numerical description of dephosphorization, size and composition of inclusion in steel, slag entrainment, flow pattern in SEN's, reconstruction of dendrites, stress‐strain during continuous casting, centreline segregation, thermoelastic properties, phase transformations, forming of seamless pipes and ...

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