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Cylinders of burnt dolomite with the apparent porosities of 20 to 35% were immersed into molten FetO-CaO-SiO2 slags at temperatures of 1350 to 1425°C and rotated at 100 to 400rpm. The …
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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 …
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The CaO introduced by calcined dolomite could reduce the increase of oxygen to molten steel owing to better thermodynamic stability compared with MgO. Meanwhile, CaO could absorb [P] to form Ca 3 (PO 4) 2 on the surface of calcined dolomite particles, which was beneficial for dephosphorization of molten steel. ：
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After tapping the steel, the remaining slag is retained for the dephosphorization of the next heat [8], [12]. The experimental studies with double slag practice in a 150-metric ton converter at ...
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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 …
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Thermodynamic Study on BaO CaO CaF2 Slags for Dephosphorization. The 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 to with an activity coefficient of P2O5 …
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Therefore, we have developed a flux for dephosphorization of steel in induction furnace (5-40 kg scale) based on thermodynamics studies (FactSage) and experimental conditions. Synthetic slag ...
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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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By controlling the input power of the induction melting furnace, the temperature of the molten steel is controlled below 1450°C, and the dephosphorization agent composed of lime-iron...
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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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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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Integrated steel plants utilize large amounts of slag former such as lime and dolomite to produce steel. During the production of steel, 2–4 t of wastes are being generated per tonne of steel produced (Das et al., 2007).The various solids wastes exist in the form of slags, sludges, dusts, mill scales, etc. Amongst the numerous solid wastes, steel slag is a byproduct of …
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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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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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The high-efficiency dephosphorization mechanism of steel by a novel porous MgO-CaO based refractories ... Dolomite refractories are widely used in the refining process of clean steel and are ...
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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. ... including oxygen consumption, lime weight ...
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A strategy to make low phosphorus steel has been developed at Tata Steel. It is now possible to meet the market/process demand of 0"020% max phosphorus by adopting the following: o Use …
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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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Dephosphorization slag (i.e. the first slag) must be dumped as quickly as possible. The steel tapping E. Keskinkilic temperature was found to be very critical to achieve low phosphorus compositions less than 0.007%; so, high tapping temperatures must be avoided.
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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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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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The high [P] r /[P] e indicates that the phosphorus content in the steel is high and the dephosphorization effect is not good. Under certain slag composition and temperature conditions, [P] ... Its lime consumption was decreased with 19.75 kg per ton steel, and lightly burned dolomite was decreased with 9.86 kg/t, ...
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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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The effect of slag composition under M'O (monoxide, M = Fe,Mg) saturation and fully liquid conditions on dephosphorization and slag ability was evaluated in an electric arc furnace (EAF) steelmaking plant operation by considering thermodynamics and phase equilibria. It was confirmed that M'O saturation slag is more favorable for higher dephosphorization than …
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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. Details
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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, in nature, dolomite is not available in this exact proportion. ... The second major use of dolomite is in steelmaking. In steelmaking ...
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The lime consumption per ton steel decreased by 42.4%, the dolomite consumption per ton steel decreased by 12%. the limestone consumption per ton steel increased by 34.3% and the cost of steel ...
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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.
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To further elucidate the mechanism of high-efficiency deep dephosphorization using the duplex method, the morphology, mineral phase structure, and phosphorus aggregation behavior of the CaO–SiO 2 –FeO–P 2 O 5 slag system with varying FeO content and basicity are analyzed using fourier transform infrared spectrometer, X-ray diffractometer (XRD), and …
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In order to produce ultra-low phosphorus steel, the deep dephosphorization experiment of steel containing phosphorus about 0.01 % outside BOF was carried out by high basic slag of CaO CaF2-FeO at ...
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