32results about How to "Increase distribution concentration" patented technology

The invention discloses a converter smelting method for improving end molten steel remainder Mn with medium-high-Mn, high-P and low-Si molten iron (C4.20-4.60wt, Mn 0.90wt%-1.15wt%, Si 0.05-0.15wt%, P0.100-0.130wt% and S smaller than or equal to 0.040wt%). Integrated innovation is conducted on processes such as slag retention operation, continuous casting residual slag application, low-alkalinityslagging process, constant-pressure low lance position operation in the smelting process and tapping slag washing in the whole process, smelting reaction dynamics and thermodynamic conditions are optimized, the distribution concentration of MnO in slag in the smelting process is increased, better smelting slagging and dephosphorization effects are obtained under the conditions of little slag andlow-alkalinity slag systems, rephosphorization of molten steel in the later period of smelting and the tapping process is reduced to the greatest extent, the content (0.43wt%-0.55wt%) of end point molten steel residual Mn is significantly increased, the addition amount of Mn alloys in the deoxidation alloying process is reduced, the steelmaking alloy consumption and alloying cost are significantlyreduced, the economic indexes of the smelting technology is improved, and the market competitiveness of products is improved.

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.