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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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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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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Basic Oxygen Furnace: Most Efficient Technologies for Greenhouse

On the basis of thermodynamics and dynamic analysis on dephosphorization in BOF, it showed that bottom-blowing was the main dynamic means to improve dephosphorization efficiency, which could balance the stir of slag-steel interface and dephosphorization temperature control (Rout et al. 2015). Bottom blown furnaces are equipped with many tuyeres ...

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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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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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Use Of Dolomite On Dephosphorization Steel

Dephosphorization is one of the most important tasks during BOF steelmaking process. Increased phosphorus content in steel will reduce the toughness of the steel sig-nificantly, leading to cold brittleness of the steel, and adversely affect the welding performance [2, 3]. Therefore, end-point phosphorus content of BOF steelmaking process. Details

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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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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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Optimization of Dephosphorization Parameter in Consteel Electric …

steel research international is a metallurgy journal covering process metallurgy, ... The proper process parameter of dephosphorization is a key problem in actual steelmaking production. ... the importance variables, including oxygen consumption, lime weight, dolomite weight, smelting temperature, and scrap ratio (ratio of scrap weight and hot ...

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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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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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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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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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A Process For Facilitating Dephosphorisation For Steel …

The improved dephosphorization efficiency of the oxidizing slag results from addition of iron-ore pelletized with lime and dolomite, that causes effective slag-metal interface …

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On Increasing Mn Recovery During Production of Mn …

Recovery of Mn in steel making process depends on various processing parameters such as temperature, flow rate ratio of oxygen and argon gas in AOD process, carbon content, slag basicity, and V ...

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Buy Dolomite Powder for Steel Industry in India

Dolomite Powder for Steel Industry. Dolomite is a mineral with a specific gravity of 2.8 to 2.9 and a Mohs hardness of 3.5 to 4. Minerals can have any color, including colorless, white, pink, green, grey, brown, or black. ... top-blown converters mainly use lump lime. Dephosphorization and desulfurization are encouraged by the large specific ...

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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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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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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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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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(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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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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Double Slag Operation Dephosphorization in BOF for …

low temperature, which favors dephosphorization. On the other hand, it involves large amount of slag and substantial temperature loss. The use of double converters is associated with considerable high cost. Phosphorus can also be removed from steel after converter processing to obtain the ultra-low phos-phorus steel[7-11). However, the ...

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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 the lime additions in the converter and thus to have better control of slag and temperatures in the converter.

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The high-efficiency dephosphorization mechanism of steel by a …

The introduction of calcined dolomite in MgO based refractories for tundish was beneficial for clean steel smelting. The CaO introduced by calcined dolomite had good …

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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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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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Removal of Phosphorous from Steel Produced by Melting …

In secondary route of steelmaking, production through induction melting furnace contributes about 31 % of India's total steel production. The main raw materials used are steel scrap, cast iron and sponge iron. In India, majority of the induction furnaces are operated using acidic lining of silica based ramming mass to produce structural steel where basicity cannot be …

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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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