Abstract
Generally speaking, sulphur is considered a harmful element for steel quality, reason why all the technological steps are being taken in order to eliminate it from the metal bath. This paper deals with the influence of the chemical composition, on the slag quantity and of the bath stirring condition upon the desulphurization process in the casting ladle by treatment with synthetic slag. The experiments were made at an open-hearth plant with the steel tapping in two ladles (the desulphurization was made with synthetic slag at one ladle while the other one was considered standard) and at the electric steel plant and for the synthetic slag formation a mix was used, made, according to several receipts, of: lime (50-75%), fluorine (0-17%), bauxite (0-32%) and aluminous slag (8-22%). The data were processed in the calculation programs EXCEL and MATLAB, which resulted in a series of correlations between the desulphurization degree and the chemical composition of the slag, respectively the slag quantity both for the charges bubbled with Argon and the unbubbled ones.
Highlights
Speaking, sulphur is considered a harmful element for steel quality, reason why all the technological steps are being taken in order to eliminate it from the metal bath
The data we obtained were processed under Excel and Matlab calculation programs in order to obtain the correlations between the degree of desulphurization and the specific slag quantity, respectively the chemical composition of the slag (CaO, Al O, fluorides: Me F), the results being given both x under analytical and graphical form
Having studied the process of steel desulphurization in the casting ladle with synthetic slag obtained by melting the desulphurization mixture, we reached the following conclusions:
Summary
Sulphur reaches the steel bath through the metallic charge, fuels and added elements. Because the sulphur contents in these sources cannot be reduced below certain limits, the elaboration process has to be carried out in such a way that an advanced desulphurization be achieved both in the furnace and in the casting ladle. By treating liquid steel with synthetic slag, desulphurization is being transferred from the elaboration aggregate to the casting ladle. In industrial practice, one has to take into account steel temperature, both for its direct influence upon the desulphurization process and indirectly, by means of slag viscosity, when, in order to obtain the synthetic slag, solid mixtures are being added into the ladle. The desulphurization process using synthetic slag can be most influenced by means of the chemical composition of the slag (resulting from the variation of slag recipe) and by a specific adding of slag
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