A control method for converter smelting high-phosphorus titanium-containing iron water-retained carbon tapping

Abstract

The invention discloses a control method of carbon maintenance tapping in converter smelting of high-phosphorus titanium-contained molten iron, and belongs to the technical field of steel production. A slagging mode mainly using active lime and ores is adopted; and the effective CaO content of the active lime is requested to be higher than 85% or above. A converter adopts a slag retaining and single slag operation method; the slag retaining operation is performed according to the slag retaining quantity of the converter being 1 / 2-1 / 3 of the total slag quantity; and the production is performed according to a mode of 90% of molten iron and 10% of waste steel of the charging quantity of the converter. The specific smelting operation process of the converter comprises two parts: the first part is the converter smelting operation; and the second part is the slag and iron separation operation in the tapping process. The control method has the following advantages: the difficulties of higher viscosity of slag at the earlier stage of the converter smelting of the high-phosphorus titanium-contained molten iron, weak slag and iron separation effect and weak slag dephosphorization effect at the middle and earlier stage are solved; the purpose of carbon maintenance tapping in converter smelting is achieved; most furnace feeding slag of titanium in molten steel is removed; and the TiO2 content in final slag of the converter is 3.6-5.0%. The slagging mode mainly using the active lime and the ores is adopted; and the effective CaO content of the active lime is requested to be higher than 85% or above.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to a control method for tapping high-phosphorus titanium-containing iron in water and carbon by converter smelting. Background technique [0002] The titanium content of normal molten iron is about 0.10%, which has no effect on converter smelting. When the converter is smelting molten iron containing titanium, chromium, vanadium and other elements (Ti (0.10-0.50%), Cr (0.10-0.20%), V (0.05-0.10%) and other high-temperature elements, especially high-phosphorus, high-titanium molten iron (P≥0.12%; Ti≥0.20%), the slag is too sticky in the early stage of the converter, the separation effect of slag and iron is poor, and the dephosphorization effect of the slag in the middle and early stages is poor; A series of problems such as gun accidents, deterioration of steel material consumption technical indicators, high oxidation of final slag, corrosion of furnace bottom, poor...

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a kind of control method of converter smelting high-phosphorus titanium-containing molten iron with carbon retention and tapping, aiming at high-phosphorus molten iron containing titanium and chromium residual elements (C: 4.20~6.80%, Si: 0.30~0.70%; Mn : 0.30~0.70%; P: 0.12~0.15%; S: 0.02~0.07%; Ti: 0.20~0.50%; Cr: 0.10~0.20%), to solve the problem of excessive slag slag in the early stage of converter smelting of high phosphorus titanium and chromium iron Poor separation effect of slag and iron, and poor dephosphorization effect of slag in the middle and early stages, to achieve the purpose of carbon-preserving steel tapping in converter smelting, most of the titanium in molten steel enters the slag, and the final slag of the converter is TiO 2 Content 3.6~5.0%

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