Method for smelting high-titanium liquid iron by utilizing converter

Abstract

The invention discloses a method for smelting high-titanium liquid iron by utilizing a converter. The method is mainly used for smelting the high-titanium liquid iron with the titanium mass percentage of 0.3 to 0.5 percent by utilizing the converter. By adopting a double-slag process, the binary basicity of the furnace slag on the preliminary smelting stage of the converter is 0.8 to 1.2, the mass fraction of TFe is 15 to 25 percent, the temperature of a smelting pool is 1370 to 1420 DEG C, and the slagging quantity can reach 50 to 60 percent, so that the problem that the melting point of the furnace slag is increased because the titanium in the liquid iron is oxidized and enters the furnace slag can be maximally reduced; the decarbonization is carried out according to the conventional converter smelting process. By adopting the production process, the melting point of the furnace slag on the preliminary smelting stage can be lowered, the mobility of the furnace slag is good, the overall phosphorus removal rate can reach more than 85 percent, and the splashing can be avoided.

Description

technical field [0001] The invention relates to the technical field of converter steelmaking, in particular to a method for improving the total dephosphorization rate by adopting a double slag process and optimizing slag composition and oxygen supply parameters. Background technique [0002] In order to alleviate the increasingly tight mineral resources and expand the use of iron-containing materials, some steel enterprises add magnetite ores containing V and Ti for smelting. While the cost is low, it also brings the problem of high Ti content in molten iron. Since the binding ability of Ti and O is stronger than that of Si, Mn, P and other elements, Ti in the molten iron in the early stage of converter smelting is oxidized and enters the slag, resulting in TiO in the slag. 2 The high content greatly increases the melting temperature of the slag, making the slag very viscous and poor in fluidity, which is not conducive to the subsequent dephosphorization. If the conventiona...

AI Technical Summary

Problems solved by technology

Since the binding ability of Ti and O is stronger than that of Si, Mn, P and other elements, Ti in the molten iron in the early stage of converter smelting is oxidized and enters the slag, resulting in TiO in the slag. 2 The high content greatly increases the melting temperature of the slag, making the slag very viscous and poor in fluidity, which is not conducive to the subsequent dephosphorization

If the conventional double slag dephosphorization process is used to control the binary basicity of the slag in the early stage of smelting R≥1.5, the temperature of the semi-steel is controlled at 1350-1400 °C, and the TiO 2 The slag cannot be melted, which seriously affects the amount of slag pouring, and at the same time, the dephosphorization task in the later stage of converter smelting cannot be realized

[0003] At present, the main research on high TiO 2 The influence of slag on blast furnace smelting or the smelting of semi-iron molten iron has not been found. The introduction of the dephosphorization production process of direct smelting of high-titanium molten iron in the converter