Effect of Stirring Energy, Temperature and Flux Composition on Hot Metal Dephosphorization Kinetics.

Abstract

In order to extend the appiicability of a coupled reaction model to the hot metal dephosphorization process, evaluation method for unknownparameters was investigated. The following points were clarified.(1 ) Mass transfer coefficient in metal phase was increased in proportion to~~/ ' The quantitative information of the influences of various factors on the mass transfer coefficient in the metal and the slag phase, decarburization rate and equilibrium partition ratio are necessary to solve these equations. By these method, Eqs. (6) and (7) were obtained and In Fig. 4

A Kinetic Model to Simulate the Reaction Between Slag and Matte for the Production of Ferromanganese Alloy from Steelmaking Slag

“…For these calculations, the value of k S (or k M ) was determined such that the calculation line agreed with the experimental result. The actual calculated value of k M was 0.0015 m/s, which is close to that used for the slag/metal reaction in a laboratory-scale experiment [20]. The overall mass transfer coefficient (k ov ) is described by the following equations, where L is the equilibrium distribution ratio and X M and X S are the mole fractions of X in the matte and slag, respectively.…”

“…The mass transfer coefficients of both the slag and the matte were assumed to be 0.002 m/s. This value was calculated using the empirical equation originally proposed to calculate the mass transfer coefficient of the metal phase under Ar gas bubbling [20]. Figure 6 shows the influence of the ratio of the initial masses of slag and matte (R S/M ) on the Mn yield and {Mn} after the treatment by each matte with a different initial composition.…”

“…In the case of metal and slag, the mass transfer coefficient of metal is generally 3-10 times larger than that of the slag [14,20]. The viscosity of matte is about 10-100 times larger than that of slag [21,22], and the diffusion coefficient in matte is about 10 times larger than that in slag.…”

Law of Mass Action Based Kinetic Approach for the Modelling of Parallel Mass Transfer Limited Reactions: Application to Metallurgical Systems

“…The effective equilibrium constant method, also known as coupled reaction model, has been applied extensively for mathematical modelling of hot metal dephosphorization, [32][33][34] desiliconization 35) and decarburization. [36][37][38] In this approach, the equilibrium constants are modified to effective equilibrium constants, which in combination with electro-neutrality condition, are employed to solve a system of parallel mass transfer limited reactions.…”

Analysis of Hot Metal Desiliconization Behavior in Converter Experiments by Coupled Reaction Model

“…This dependency of the mass transfer coefficient in metal on e/d c 2 is almost the same as this work. On the other hand, Kitamura et al 7) reported that the mass transfer coefficient in metal was proportional to 0.5 power of e/d c 2 . Higuchi et al 8) also reported that the mass transfer coefficient in metal was proportional to 0.5 power of e/d c 2 in the measurement of oxidation of aluminum in molten steel.…”