Iron recovery and dephosphorization behaviors from high
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 …
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 1018.03 to 1019.11 with an activity coefficient of P2O5 ranging from 10-19.47 to 10-18.09. …
Effect of highly oxidizing converter dephosphorization slag …
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 ...
Thermodynamic Study on BaO-CaO-CaF_2 Slags for Dephosphorization …
The molten steel was dephosphorized by high basic BaO-based slags (BaO-CaO-CaF_2) to achieve ultra low phosphorus level. The dephosphorization ability of the BaO-CaO-CaF_2 slags was tested. The phosphate capacity of this slag system at 1 620 ℃ varied from 10~(18.03) to 10~(19.11) with an activity coefficient of P_2O_5 ranging from 10~(-19.47) …
Effect of Direct Reduced Iron (DRI) on …
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.
Effect of direct charging of hot recycled slag on hot metal
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 …
Basic Oxygen Steelmaking Slag: Formation, Reaction, …
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 ...
Dephosphorization in New Double Slag Converter …
The dephosphorization of hot metal with low basicity slag at 1623K is investi-gated for new double slag converter steelmaking process (NDSP) using high-temperature laboratorial experiments. When the dephosphorization time is 15min, the dephosphorization ratio reaches the highest value of 83.2%. When
Research Article Han Yang, Yan Liu*, Kun Wang, Ting-an …
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
Effect of Modification Treatment for Reduction of Dephosphorization …
Three types of dephosphorization steel slags were reduced using carbon-saturated iron bath to extract iron and phosphorus simultaneously. During the process of reduction, slag composition, temperature, and original P 2 O 5 content were investigated respectively. Slag modification treatment, adding either silica or alumina to vary the slag ...
Method for Dynamic Prediction of Oxygen Demand in …
oxidized and removed, the hot metal is heated and smelted into molten steel. With the improvement in the requirements for the composition and temperature at the end of BOFs, the functions of traditional BOFs, such as "three desorption" and heating, have been gradually decomposed into dephosphorization–decarbonization duplex …
Double Slag Operation Dephosphorization in BOF for …
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.
Iron recovery and dephosphorization behaviors from …
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 ...
Ferroalloy Refining Process | SpringerLink
(3) Reduction dephosphorization refining process. Most ferroalloys can be strongly bonded with oxygen, so reduction dephosphorization agent is used to remove the phosphorus in the ferroalloy. Reduction dephosphorization agents commonly include silicon-calcium alloy, calcium metal, calcium carbide, calcium oxide–calcium fluoride slag.
On Increasing Mn Recovery During Production of Mn-Based Stainless Steel
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 ...
[PDF] Dephosphorization of Stainless Steels | Semantic …
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 …
Processes | Free Full-Text | Behavior of Carbothermal Dephosphorization …
Phosphorus-containing converter slag is a common waste in the iron and steel industry, and has the characteristics of high generation and low secondary-utilization values; however, the high-phosphorus content in converter slag limits its ability to be recycled during the steelmaking process. In this study, the dephosphorization behavior …
Dephosphorization in Double Slag Converter …
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.
A novel method for CO2 injection direct smelting vanadium steel …
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 …
[PDF] Parameters Affecting Dephosphorization of Stainless Steel …
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 …
The Effect of Na2O and Al2O3 on Dephosphorization of …
It was found that the addition of small amount alumina can im-prove the fluidity of high CaO/SiO. 2 slags and increase phosphorus partition ratio. In the case of CaO/SiO (in. mass%) 1.9 with 5% Al2O 3 addition, an apparent phos-phorus partition ratio of 310 and dephosphorization rate of 91% were obtained.
Quality of Lime for Steelmaking in Converter – IspatGuru
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.
Contribution of Emulsion Zone in Refining of Basic Oxygen
Understanding 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 …
Quality of Lime for Steelmaking in Converter – …
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 …
Study and practice of dephosphorization of electric arc furnace steel
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 …
Flux Development for Dephosphorization of Steel in
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 ...
Kinetics of Dephosphorization in Double Slag Converter
The kinetic model of dephosphorization (De-P) based on the coupled reaction model by combination with the heat balance temperature model and the lime dissolution model was used for the De-P stage in the double slag converter steelmaking process. At the different De-P temperatures, 220-ton industrial experiments and 0.5-kg …
Effect of Direct Reduced Iron (DRI) on Dephosphorization …
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 …
Numerical Study of the Kinetics of Dephosphorization with …
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 …
Method of making steel by deeply dephosphorization in …
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 …