A preparation method for extracting carbon and preserving manganese by converting high-manganese, high-sulfur, and high-phosphorus iron into hot water

Abstract

The invention discloses a preparation method for carbon extraction and manganese consercation in medium-manganese high-sulfur high-phosphorus molten steel (Mn is 1.20-1.90wt%, Si is 0.070-0.090wt%, Pis 0.120-0.200wt% and S is 0.20-0.40wt%) in converter steel making. By adopting the preparation method, processes such as slag retention operation, addition of a small amount of manganese spheres at the early stage of smelting, little slag smelting, constant pressure gun conversion operation in the smelting process, lowest gun position pressing operation in primary pouring of a converter, and slagwash of whole-process steel discharge, are integrated and created, smelting reaction kinetic and thermodynamic conditions are improved, excellent slugging and phosphorus removal effects are achieved,molten steel and slag splashing in the smelting process is avoided, a MnO allocation concentration is effectively increased, reduction of the MnO at the medium stage of smelting is promoted, secondary oxidation of Mn in molten steel at the later smelting stage is reduced, furthermore, the content of residual Mn in the molten steel at a final point is remarkably increased (0.40-0.60wt%), the addition amount of a manganese alloy in a deoxidation alloying process is reduced, the steel making alloy consumption and alloying cost can be remarkably reduced, improvement of economic indexes of a smelting technique is promoted, and the market competitiveness of products can be improved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy and steelmaking technology, and in particular relates to a preparation method for converting high manganese, high sulfur and high phosphorus iron into hot water to extract carbon and preserve manganese. Background technique [0002] Manganese (Mn) element is a beneficial element in steel. During the converter smelting process, with the continuous blowing process, most of the Mn in the molten iron is oxidized. The alloy cost is higher. The Mn content of molten steel at the end of converter smelting mainly comes from Mn in molten iron. During the blowing process, manganese oxidation and reduction reactions occur between the molten metal pool, slag and oxygen, and the residual Mn content in molten steel at the end of converter is affected by The influence of factors such as the amount of slag, the oxidation of molten steel and slag at the end of the converter, and the temperature a...

AI Technical Summary

Problems solved by technology

At present, domestic steel mills basically use low-Mn, low-S and low-P molten iron with the following chemical composition (Mn≤0.60wt%, S≤0.040wt%, Si0.30-0.55wt%, P≤0.100wt%) Smelting, there are some domestic research reports on the converter smelting process of the above-mentioned molten iron composition, but there is no relevant research report on the smelting process using high-manganese, high-sulfur, high-phosphorus molten iron to extract carbon and preserve manganese