Abstract
In this paper, a calculation model for decarburization kinetic in solid metal melting process is studied. Firstly the macro-kinetic model is established, and the melting and decarburization process is divided into five steps, which are adsorption and dissolution of O2, liquid phase mass transfer of [C], interfacial reaction of [C] and [O], diffusion of CO gas, and melting and dropping of metal. Secondly based on the assumptions that the total decarburization process is steady at the reaction temperature of 1800 K, the interface reaction is in equilibrium state, the composition in the liquid metal is homogenous, all the activity coefficients are 1 and so on, the calculation model is simplified into equations set with six formulas, and is calculated under 10584 conditions with the help of VB software. Results show that the C or O2 deliverability is the restricted link under different conditions. Finally, a decarburization experiment of melting pig iron at the rate of 0.56 kg/(s·m2) is achieved, and it proves that the simplified calculation model is in uniform with the actual data at a low melting rate.
©2015 by De Gruyter
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