This invention relates to a method for the desulphurisation of hot metal, comprising intermixing the hot metal to be desulphurised with a slag containing as the principal ingredients lime,magnesium and a slag …
In the hot metal desulphurization process, Carmeuse offers fluid milled lime or blends to be injected into the hot metal through an immersed lance using an inert carrier gas such as argon or nitrogen. Since desulphurization is a diffusion-controlled reaction and related to the reactive surface area available for reaction, the lime must be as fine as possible and …
In hot metal desulphurisation (HMD) the slag will hold the removed sulphur. However, the iron that is lost when the slag is skimmed off, accounts for the highest costs of the HMD process.
In hot metal desulphurisation (HMD) the slag will hold the removed sulphur. However, the iron that is lost when the slag is skimmed off, accounts for the highest costs of the HMD process.
2. DESULFURATION PROCESS OPTIMIZATION OBJECTIVES In a co-injecting desulfuration process, after weighing up respectively, Mg and Cao reagents from their own tanks are mixed in an injecting pipe, and then injected into a hot metal pot by an injector. Because the mouth of the injector is near the bottom of the pot, hot metal is …
The effect of flux addition method on hot metal desulfurization in a mechanical stirring process was investigated in a 1/12-scale water model and a 70 kg-scale hot model experiments.
The HIsarna process is one of the emerging low-CO 2 ironmaking processes that could help the steel industry in achieving their carbon footprint goals. HIsarna hot metal contains 3–4 times more sulfur than hot metal from blast furnaces (BFs). Therefore, a literature study, a thermodynamic analysis, and plant data analysis …
In hot metal desulphurisation (HMD) the slag will hold the removed sulphur. However, the iron that is lost when the slag is skimmed off, accounts for the highest costs of the HMD process.
1 Introduction. Hot metal desulfurization serves as the main unit process for removing sulfur in blast-furnace-based steelmaking. Hot metal desulfurization is commonly conducted in a ladle or a torpedo car, 1 using a desulfurization reagent that is either injected into the metal bath or added on top of it. 2 From the thermodynamic point of view, the …
Desulphurisation process In Europe and North America, the magnesium-lime co-injec-tion process is the state-of-the-art HMD process. In this process magnesium and lime are injected into the hot metal. Most of the desulphurisation (>95%) takes place by the reaction between magnesium and sulphur in the bath (reaction 1).
the efficiency of hot metal desulphurisation treatment is important for process optimisation. To this end, a novel mathematical model was developed, based on the thermodynamic-kinetic fundamentals ...
Hot metal treatment allows further to split the complete steelmaking process in separate process steps which are rather simple and easier to control, making steel production process more robust. Within the last …
A kinetic model of the RH desulfurization process was established based on the two-film theory, considering the desulfurizer addition in the RH vacuum chamber and the slag desulfurization in the ladle. The kinetic model was used to predict the variation of the sulfur content in the molten steel during the RH desulfurization process, which was in …
The mathematical modelling of hot metal desulphurisation has been addressed in several studies [3][4][5][6][7][8][9][10][11][12][13][14][15] [16] [17], which have established the basic rate ...
In hot metal desulphurisation (HMD) the slag will hold the removed sulphur. However, the iron that is lost when the slag is skimmed off, accounts for the highest costs of the HMD process. These iron losses are lower when the slag has a lower viscosity, which can be achieved by changing the slag composition.
The desulphurisation of steel is a key process in ladle metallurgy that is mainly achieved in ladles during secondary steelmaking. Low level of sulphur in end product is required for enhanced mechanical properties of steel. ... This method can be utilized for improving desulphurisation of steel whenever the hot metal sulphur is high. …
The results show that the average hot metal dephosphorization rate of calcium ferrite slagging is 88.06%, and its dephosphorization effect is better than that of fluorite slagging. The average hot metal dephosphorization rate of fluorite slagging is 77.7%. The slag melting temperature during calcium ferrite slagging is 1137°C on …
The results are summarized as follows: (1) Optimum silicon content on the process without hot metal dephosphorization treatment at [P] = 0.110% If tapping-temperature is 1 700°C, optimum [Si]≅0 ...
Part II: Optimal hot metal desulphurisation slag 3 Optimal hot metal desulphurisation slag: fundamentals 45 3.1 Introduction 46 3.2 Sulphur removal capacity 47 3.2.1 Desulphurisation process 47 3.2.2 Sulphide capacity 50 3.2.3 C S in an industrial HMD 56 3.2.4 Basicity 58
Ville-Valtteri Visuri,* Tero Vuolio, Tim Haas, and Timo Fabritius. Hot metal desulfurization serves as the main unit process for removing sulfur in blast-furnace based steelmaking. The available body of literature on modeling hot metal desulfurization is reviewed to provide an in-depth analysis of the approaches used and results obtained.
hot metal desulfurization is presented in Table 1.A se x p e c t e d, most of the fundamental models fall into the category of p r o c e s sm e c h a n i s mm o d e l s .T h i si sa s s o c i a t ...
The study investigates the effects of particle diameter, hot-metal temperature, carrier gas, reagent flow, and lance arrangement on hot-metal desulfurization. The results show that as the particle diameter decreases from 30 to 20.9 μm and 11.8 μm, the desulfurization rate increases from 50.92% to 66.02% and 89.99%, respectively.
the regularities of hot metal desulphurisation, so that every hot metal charge is individual desulphurised with the optimum process. Plant technology To minimise the operating costs of the hot metal desulphurisation process, Polysius offers a special injection technology under the proprietary name MEPOL. The core item of the MEPOL technology is the
To solve the technical problems of hot metal desulfurization by injecting magnesium particulate, a new method of hot metal desulfurization by bottom-blowing magnesium vapor combined with mechanical agitation was put forward. The effects of three different desulfurization processes on the desulfurization efficiency were studied in view …
With the increasing demand of high-quality steel, desulphurisation process is inevitable and selection of high-performance refractory for hot metal ladle application is the need of the hour to ensure availability of ladle by accommodating a greater number of heats, minimising repair and relining activities. 2. Current practises & performance
Abstract. A 1/5 scale water model simulation was used to study the kinetic mechanism for 300 t mechanical stirring desulfurization station, factors including rotating speed, immersion depth and size of impellers were investigated. The results show the dispersion behavior of desulfurizer can be divided into three stages, (1) the entrainment ...
Desulfurization refers to the process of injecting hot metal with chemical agents in order to bind, and thereby remove, a portion of the sulfur in the metal. From: Journal of Process Control, 2004. ... Desulphurisation processes are referred to as clean coal technology. Therefore using the waste residues from these processes presents a ...
A three-dimensional mathematical model was established to predict the multiphase flow, motion and dispersion of desulfurizer particles, and desulfurization of hot metal during the Kanbara reactor (KR) …
WO2021064751 - HOT METAL DESULPHURISATION IN KANBARA REACTOR (KR) PROCESS. Publication Number WO/2021/064751 Publication Date 08.04.2021 International Application No. PCT/IN2020/050845 International Filing Date 30.09.2020 IPC C21C 7/064 ... (DS) of hot metal through KR-process. In particular, it relates to the …
In this work, the effects of three flux addition methods (batch, continuous, blasting) on hot metal desulfurization with mechanical stirring were investigated in a 1/12-water model experiment and 70 kg hot metal desulfurization experiments. The water model was used to investigate flux dispersion and aggregation behavior during flux addition ...
For an IGCC-integrated high temperature desulphurisation process, only the temperature range above 300°C is of interest, as below 300°C kinetics become too slow. It is clear that SrCO 3 and BaCO 3 can be used for in situ desulphurisation in gasifiers operating at 1100°C–1500°C, where dolomite and limestone are no longer …
Desulphurization of Liquid Steel. Solubility of sulphur (S) in liquid iron (Fe) is quite high. But the solubility of S in solid iron is limited. It is 0.002 % in ferrite at room temperature and 0.013 % in austenite at around 1000 deg C. Hence, when liquid steel cools down, sulphur is liberated from the solution in the form of iron sulphide (FeS ...
Different HM desulphurisation processes are used worldwide. With co-injection or the Kanbara reactor, sulphur concentrations below 0.001% are reached. Basic slag helps desulphurisation in the ...
