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US Patent Application for METHOD OF MAKING STEEL BY …
A method of making steel by deeply dephosphorization in a hot metal tank and decarburization using semi-steel with nearly zero phosphorus load in a converter includes the following steps: putting an efficient dephosphorization agent into the hot metal tank in advance, and conducting dephosphorization during blast furnace tapping and transportation of blast furnace hot metal …
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Quality of Lime for Steelmaking in Converter – IspatGuru
Also in this case, especially with low iron oxide contents in the slag, the phosphorus contents in the steel are reduced by the use of the properly calcined lime. With the use of a properly calcined lime, it is possible to reduce …
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Method for dephosphorization and desulphurization in process of steel
The invention provides a dephosphorization and desulfurization method adopted in the steelmaking process of an induction furnace, which is characterized in that the temperature of the molten steel is controlled below 1450°C during the furnace material melting period and the initial stage after complete melting, and lime-iron oxide- The dephosphorization agent composed of …
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Development of Synthetic Flux and a Process for De
Approximately 90% of nearly 15 million tonnes of steel produced in Indian induction furnaces, using DRI as the major feed material and containing phosphorous in the range of 0.08 - 0.11% is used for structural purpose. ... Commercial grade quartzite, limestone/dolomite, soda ash, mill scale, manganese ore etc. 9.
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Role of Slag in Converter Steelmaking – IspatGuru
The most important mechanism is the dissolution of lining into the slag. Rapid slag formation in order to bind and neutralize acidic SiO2 forming in the blow beginning, is a key point. Highly oxidizing hot slag dissolves magnesia or dolomite lining readily. Use of calcined dolomite can greatly improve the lining life.
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Properties of Fluorine-Free Steelmaking Flux Prepared Using …
Dephosphorization experiments in a 200 kg induction furnace showed that using red mud as a flux, under semi-steel conditions ([C] = 2.5~3.0 wt%), reduced the [P] in the melt pool to below 0.02 wt% (initial [P] in hot metal was 0.17 wt%), with a dephosphorization rate of over 90%, fully demonstrating the fluxing effect of red mud in deep ...
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Dephosphorization of Steels
Dephosphorization of steels has become a very important metallurgical technique in steelmaking process to produce high quality steels. As the P content is controlled by the reactions in BOF, the double slag technique …
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Dephosphorization in the early stage of converter …
Dephosphorization in the early stage of converter steelmaking is important for both single and double slag processes. If the slagging is not good in the early stage of blowing, the dephosphorization efficiency is not high and it is …
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Optimization of Dephosphorization Parameter in Consteel Electric …
The proper process parameter of dephosphorization is a key problem in actual steelmaking production. This article presents a rule set model combining a k-means method and a decision tree model, which can extract the rule set from the actual production data to optimize the dephosphorization process. ... including oxygen consumption, lime weight ...
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use of dolomite on dephosphorization steel
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 …
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Production of Low Phosphorous Stainless Steel by the …
In order to produce stainless steel with low phosphorous content below 0.01 %, experiments were carried out to find optimum conditions for the dephosphorization by metallic Ca and CaC2. The results are summarized as follows : (1) Dephosphorization by metallic Ca …
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(PDF) Industrial uses of slag. The use and re-use of …
concern in the use of steel slags for this purpose. Murphy . ... In dephosphorization slag, Ca3(PO4)2 usually formed a solid solution with Ca2SiO4, so the form of phosphorus in the slag was mainly ...
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Dolomite – Its Processing and Application in Iron and …
The main uses of dolomite in iron and steel industry are (i) as a fluxing material (ii) for protection of refractory lining, and (iii) as a refractory raw material. Dolomite in iron and steel industry is normally used in three forms.
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Double Slag Operation Dephosphorization in BOF for Producing …
There are several methods to remove phosphorus to produce low phosphorus steel. Dephosphorization of hot metal can be performed in ladle, torpedo or preliminary …
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Dolomite Usage In Iron and Steel Industry | Aravali Onyx
Dolomite for Steel Industry . In addition to being a raw material for the paint industry and iron manufacturing, dolomite also plays a vital role in steel making. Given its acidic nature, the dolomite used in the steel industry must contain less than 1% of silica. Here, it finds use as a fluxing and refractory material.
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Technical Report Improvement in Hot-Metal Dephosphorization
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.
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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. …
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Dephosphorization
The reaction rate of dephosphorization at the slag–steel interface is extremely fast following the formation of slag, and the reaction rate-determining step corresponds to mass transfer on slag–steel interface. If molten iron temperature is excessively high, the distribution coefficient of phosphorus between slag and iron is extremely low. ...
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Dynamic Basic Oxygen Steelmaking Process and Its Industry …
The simulation of the basic oxygen steelmaking process was conducted, incorporating transient compositions, temperature, and weight of liquid steel and slag. The simulation utilized a 3-reactor model that considered the thermodynamics of chemical reactions and the kinetic limitations governed by mass transfer. Additionally, the kinetics of scrap …
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Dolomite – Its Processing and Application in Iron and …
It is one of the important raw materials used in production of iron and steel. Dolomite contains theoretically 54.35 % of CaCO3 and 45.65 % of MgCO3 or 30.41 % of CaO, 21.86 % of MgO, and 47.73 % of CO2. However, …
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Effect of Slag Composition on Dephosphorization and …
molten steel and its productivity during EAF operation, are strongly related to the slag composition.[2–6] Because a classic impurity in molten steel is phos-phorus, the removal of phosphorus in molten steel by EAF slag is obligatorily performed during EAF oper-ation.[7] Burnt lime (CaO) or dolomite (CaOÆMgO) are
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use of dolomite on dephosphorization steel – Grinding Mill China
Process for dephosphorization, desulfurization and … manganese slag, magnesium ores such as dolomite … This example illustrates the use of magnesium metal as a … » Free Online Chat
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The high-efficiency dephosphorization mechanism of steel by a …
The porous calcined dolomite caused the increase of apparent porosity of ramming refractories D1, which brought large contact area between sample D1 and molten steel, more O in the refractories dissolved into the molten steel.
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Chemistry of Steelmaking by Basic Oxygen Furnace
Basic oxygen steelmaking, Basicity, chemistry, converter, decarburization, Dephosphorization, lance, oxidation, slag, Chemistry of Steelmaking by Basic Oxygen Steelmaking. Basic oxygen steelmaking (BOS) is the most widely used primary steelmaking process for the production of crude steel from hot metal (HM). The process vessel is known as ...
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Removal of Phosphorous from Steel Produced by Melting …
Removal of Phosphorous from Steel Produced by Melting Sponge ... lime and dolomite compositions were determined by the equipment based on X-ray fluorescence technique of make Oxford, model—Lab-X3500. ... dition for dephosphorization is lowest possible temperature [8]. In IMF operation, slag is removed from furnace top. ...
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Double Slag Operation Dephosphorization in BOF for Producing …
There are several methods to remove phosphorus to produce low phosphorus steel. Dephosphorization of hot metal can be performed in ladle, torpedo or preliminary converter[I-6). Usually, phosphorus can be reduced to a level of O. 02 % in the hot metal. ... iron ore and burnt dolomite. The blowing of oxygen was continued until the point of ...
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Parameters Affecting Dephosphorization of Stainless Steel
A literary study has been made to find parameters affecting dephosphorization of stainless steel. Ways ... During the melting process lime (CaO) and dolomite (CaMg(CO 3) 2) is added. CaF 2 is also added in order to increase the solubility of the slag. When the process is finished, and it is
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Limestone and Dolomite and their Use in Iron and …
The main uses of dolomite (Fig 4) in ironmaking and steelmaking are (i) as a fluxing material (ii) for protection of refractory lining, and (iii) as a refractory raw material. Dolomite in iron and steel industry is normally used in …
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Properties of Fluorine-Free Steelmaking Flux …
Dephosphorization experiments in a 200 kg induction furnace showed that using red mud as a flux, under semi-steel conditions ([C] = 2.5~3.0 wt%), reduced the [P] in the melt pool to below 0.02 wt% (initial [P] in hot …
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Effective removal of phosphorus from high phosphorus steel slag …
A few existing steel slag reduction dephosphorization methods mostly use fossil fuels such as pulverized coal and coke powder as reducing agents, which not only consume non-renewable energy, but also cause significant carbon emissions and increase environmental pressures (Diao et al., 2016; Lin et al., 2014; Ryu et al., 1999; Tian et al., 2012).
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