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In the present work, the effect of dephosphorization slag basicity on the dephosphorization of hot metal has been studied in the lower temperature range of 1370 °C to 1420 °C and the lower basicity of 1.26 to 2.20 with new double slag converter steelmaking process (NDSP). Based on the ion-molecule coexistence theory (IMCT), the …
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Preparing the converter slag using lime and dolomite required reaction processes such as melting and slagging, thus, taking up the time of the high-paced converter production, during which dephosphorization is almost impossible or slower (Baricová et al., 2018). The residual steel slag after dephosphorization by carbonized …
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Today's crude steel production has reached 1689 million ton ... Lime and dolomite are both assumed to be spherical with a fixed, uniform diameter. ... using dynamic equilibrium conditions gives satisfactory results. Yet, from Rout et al. it is known that overall dephosphorization cannot be explained with the simple first-order rate equations ...
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of phosphorus in molten steel (0.012 mass pct) was achievable even when using 85 pct HBI. Hassan et al.[26] reported that the increasing DRI content from 26 to 67 pct resulted in an increase in the phosphorus content in molten steel from 0.005 to 0.015 mass pct based on EAF trials performed in EZZ Flat Steel, Egypt.
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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
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Hydrated lime Ca (OH)2 is formed by reaction of lime with water (slaking). Hydrated lime is also known as slaked lime. CaO + H2O = Ca (OH)2 + heat. Lime as a basic flux in steel production and it plays an important role in the sequence of metallurgical reactions taking place in a converter.
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After briefly describing the importance of the dephosphorization of stainless steels from the viewpoint of their corrosion resistance, as well as their production methods, the pbysicochenllcal principles of dephosphorization by oxidation and reduction are presented in more detail. When phosphorus is removed by oxidation, the oxidation loss of …
DetailsThe molten steel was dephosphorized by high basic BaO-based slags (BaO-CaO-CaF2) to achieve ultra low phosphorus level. The dephosphorization ability of the BaO-CaO-CaF2 slags was tested. The phosphate capacity of this slag system at 1 620 C varied from 1018.03 to 1019.11 with an activity coefficient of P2O5 ranging from 10-19.47 to 10-18.09. …
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A novel method for CO 2 injection direct smelting vanadium steel (CIDSVS) is proposed. Achieving selective oxidation of phosphorus is essential for the applicability of the suggested process. Under the guidance of thermodynamics, the mechanisms of CO 2 injection dephosphorization and vanadium retention were investigated with CO 2 flow …
DetailsUnderstanding the thermodynamic principles that influence the dephosphorization of steel is critical because dephosphorization is a complex multiphase reaction. To effectively remove phosphorus, it is essential to ensure sufficient emulsion formation. ... dolomite, and iron ore. Within this investigation, the hotspot zone …
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The. effect of these process parameters on Mn recovery in Mn-. based stainless steel production is studied and optimized to. maximize Mn recovery. It is observed that highest Mn. recovery is ...
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It has found that phosphorus content in steel is reduced to 0.01 wt % with the addition of developed flux of 2-3 wt % of the liquid steel. Hence, developed dephosphorization flux is suitable for ...
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These technologies reduce phosphorus and increase the cost of making steel. State-of-the-art dephosphorization technologies are described and operating costs compared for each of the established ...
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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 phosBiography:TIAN Zhi-hong(l979-), , Doctor; phorus steel[7-11). However, the dephosphorization treatment must be carried out before deoxidation and alloying.
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Industrial experiments were carried out to investigate the effect of the direct charging of hot recycled slag (DCHRS) on hot metal pretreatment dephosphorization in a dephosphorization furnace. The bulk compositions of semi-steel and slag show that a better dephosphorization effect could be achieved by applying the DCHRS process in …
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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 …
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The present paper analyzes the variation of phosphor content in steel-making in light of the actual production in Anlong Co.,Ltd,and finds out the causes to exceed the standard of phosphor content in steel through experiments in simulation of the actual production conditions.By optimizing the steel-making process better results of phosphor control …
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The peak value of dephosphorization rate linearly increases from 8.35 × 10 −5 to 4.52 × 10 −4 mass% s −1 when the weight ratio of Fe 2 O 3 is increased from 5 to 10/100 g hot metal. With the increase in Fe 2 O 3 addition amount, the mass transfer coefficient in the hot metal phase ( k m ) and that in the slag phase ( k s ) and ...
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Usuall y, the phosphorus content of HM. is in the range of 0.4 -1.0% and however, the demand of content in steel is around 0.025% or. lower. The main sources of phosphorus in steelmaking are iron ...
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of the ABM Week 7th edition, August 1st-3rd, 2023, São Paulo, SP, Brazil. INFLUENCE OF SLAG PROPERTIE S FOR STEEL. DEPHOSPHORIZATION IN EAF*. Diego Darvy Moreira 1. José Roberto de Oliveira 2 ...
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Basic oxygen steelmaking (BOS) slag, a product of hot metal element (e.g., Si, Mn, Fe, P) oxidation and flux (e.g. lime, dolomite) dissolution, plays a critical role in the production of high-quality crude steel, although its behavior inside the BOS vessel (formation and reaction with metal droplets and gas) is still not clear and its recycling ...
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Leaching dephosphorization is an effective way to remove the harmful element phosphorus from steel slags. In order to recycle the leach liquor, static phosphate adsorption with activated aluminum oxides was investigated in this work. It was demonstrated that, for an initial phosphorus concentration of 25.95 mg/L, a phosphorus …
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DOI: 10.1016/j.ceramint.2024.06.245 Corpus ID: 270575774; The high-efficiency dephosphorization mechanism of steel by a novel porous MgO-CaO based refractories @article{Zou2024TheHD, title={The high-efficiency dephosphorization mechanism of steel by a novel porous MgO-CaO based refractories}, author={Yongshun Zou and Ding …
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vanadium steel manufacturing. Phosphorus is the main harmful element in steel, which precipitates at the crystal boundary and reduces the impact resistance of steel. In general, [P] ≤ 0.045% is the limit for alloy steel (excluding low-phosphorus steel). Steelsmeltinghasalonghistory,andtheoxygentop-blown
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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 …
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The technical difficulties in hot metal dephosphorization are the dephosphorization slag with higher phosphorus content hard to dump, which is shown as Fig. 1. If the dephosphorization slag has bad liquidity, it is very difficult to dump the dephosphorization slag and remove the phosphorus content of molten steel in smelting …
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iron and dephosphorization, and it is necessary to explore a better process. Recently, the reduction–magnetic separation process was proposed as a new direction for the utilization of HPOH [16–18]. This process includes roasting reduction and grinding magnetic separation. It can simultaneously achieve iron recovery and dephosphorization. In ...
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At the dephosphorization temperature range of 1385–1410 °C, the dephosphorization ratio is higher than 55%, the P2O5 content in the dephosphorization slag is 3.93–4.17%, the logLP value is 1.76–2.09, the value of. PCO P - C. of the selective oxidation reaction of carbon and phosphorus is 53–80 Pa, and. the aFeO value is 0.284–0.312.
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Abstract. The activity of Na 2 O in CaO-based slags has been measured employing a galvanic cell technique with a β-Al 2 O 3 solid electrolyte. The iso-activity lines for Na 2 O were obtained over the liquidus composition range in the CaO–Na 2 O–SiO 2 system at 1 400°C. The activity of Na 2 O in CaO–based slag is strongly controlled by ...
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A gas-metal two-phase flow model was established for the 250 t converter blowing process, and a coupled mass transfer model based on the standard k-ε model for converter dephosphorization kinetics was used to study the effects of different oxygen lances and bottom blows on the molten steel velocity, melt pool phosphorus distribution …
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Hydrated lime Ca (OH)2 is formed by reaction of lime with water (slaking). Hydrated lime is also known as slaked lime. CaO + H2O = Ca (OH)2 + heat. Lime as a basic flux in steel production and it plays an …
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We investigated the effect of direct reduced iron (DRI) addition on dephosphorization of molten steel by electric arc furnace (EAF) slag at 1823 K (1550 °C). Various phenomena such as CO gas evolution and slagmaking by gangue oxides in DRI were experimentally observed at each reaction step. Thermodynamic behaviors of …
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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.
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The effect of industrial waste flux addition on dephosphorization of molten steel and refractory corrosion(-protection) by electric arc furnace (EAF) slag using direct reduced iron (DRI) at 1823 K ...
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The effect of CaF2 addition on dephosphorization reaction between molten steel and electric arc furnace (EAF) slag using direct reduced iron (DRI) at 1823 K (1550 °C) was investigated. Basicity, the thermodynamic parameter affecting the removal capacity of phosphorus (i.e., phosphate capacity), decreased using DRI due to an increased SiO2 …
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According to the analysis in Sect. 2, the addition of dolomite is beneficial to dephosphorization. The heat of molten steel mainly comes from the heat of hot metal and the heat of oxidation of C, Si, and other elements. The dephosphorization reaction is an exothermic reaction, and therefore, high temperature is not conducive to …
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Due to the continuous development of iron and steel industry, high-quality iron ore is rapidly decreasing year after year. Therefore, some low-grade iron ores turn out to be alternative options of steel companies [1, 2].Among them, high-phosphorus oolitic hematite (HPOH) is a competitive choice since it has a relatively high iron content …
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The influence of dephosphorization temperature, phase structure of converter slag and final slag composition on the dephosphorization of molten steel under high FeO converter slag was studied by ...
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Designing an appropriate composition of dephosphorization slag is crucial for effectively reducing phosphorus content in steels and facilitating the development of high-quality steel products. In this study, we conducted dephosphorization equilibrium experiments to elucidate the cationic effect of Ca2+, Fe2+, and Mg2+ on …
DetailsNon-metallic inclusions have a significant influence on steel performance.1,2) For instance, MgO–Al2O3 spinel inclusion may lead to steel defects and clogging of nozzles during the continuous casting process because of its high melting temperature and high hardness.3,4) Since magnesium is rarely added to molten steel, MgO from slag and MgO-based …
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