Steelmaking method for vanadium-titanium-containing high-phosphorus molten iron

Abstract

The application provides a steelmaking method of high-phosphorus molten iron containing vanadium-titanium. The steelmaking method includes following steps: providing the high-phosphorus molten iron containing vanadium-titanium; performing desulfuration, drossing and vanadium-extraction successively to the high-phosphorus molten iron containing vanadium-titanium to obtain semisteel; and with oxygen gun for supplying oxygen, mixing a composite slag material with the semisteel and successively performing blowing and steel tapping to obtain molten steel and slag, wherein an oxygen-supply intensity is 3.2-3.5 m<3> / min*t and the composite slag material includes lime, light-roasted dolomite and phosphated residue removing agent. The phosphated residue removing agent includes following components, by mass, 25-45% of CaO, 12-30% of MgO, 8-25% of FeO and 8-25% of SiO2. In the application, through technology optimization, in the situation of degradation of quality of the molten iron and difficulty in desulfuration and dephosphorization is increased, a smelt period is reduced, the steel is qualified and is increased in yield and an iron-removing capacity is ensured and achieved. In addition, the steelmaking method is low in cost and is good in effect.

Description

technical field [0001] The present application relates to the technical field of steelmaking, in particular to a steelmaking method for vanadium-titanium-containing high-phosphorus molten iron. Background technique [0002] Steelmaking is to put the pig iron used for steelmaking into the steelmaking furnace and smelt it according to a certain process to obtain steel. The pig iron is a product obtained by smelting iron ore in a blast furnace. With the massive development and utilization of mineral resources, the ore is increasingly scarce. In the face of the sharp increase in demand for iron concentrate and the reality of poor, fine and miscellaneous iron ore resources in my country, comprehensive development and utilization of various iron ores has become an inevitable trend in the smelting field. . [0003] In my country's Yunnan and other places, there are abundant high-phosphorus oolitic hematite resources, the iron grade of which is generally 40% to 45%, and the reserves...

AI Technical Summary

Problems solved by technology

[0004] Although the price of high-phosphorus oolitic hematite is low, due to its high phosphorus content, the molten iron obtained by using the high-phosphorus oolitic hematite has high phosphorus content, especially under the conditions of vanadium-titanium blast furnace smelting, molten iron It has high content of vanadium (0.3%), sulfur (0.05%~0.15%), phosphorus (0.2%~0.3%) and generally low temperature of molten iron (reaching the temperature of molten steel for smelting is 1250°C~1300°C) and the slag rate High (about 7%) and other characteristics, the condition of the molten iron is worse than that of ordinary high-titanium smelting molten iron, the steelmaking process needs to go through desulfurization, slag removal, vanadium extraction, steelmaking and deoxidation alloying and other processes, the process flow is more general It takes a long time to smelt hot metal, and the output of blast furnace iron continues to increase, and the iron elimination capacity of steelmaking can increase from 5,800 tons / day to 6,300-6,500 tons / day

Such a long smelting cycle, great difficulty in iron elimination, great impact on steelmaking, brings great difficulty to vanadium extraction and steelmaking production, thus restricting the industrial utilization of this mine to a certain extent

Images