Oxygen converter high-pressure injection limestone powder slagging and dephosphorization method

A technology of limestone powder and oxygen converter, which is applied in the manufacture of converters, etc., can solve the problems of low utilization rate and difficulty in slag removal, and achieve the effect of high efficiency and low investment cost
CN109929964AInactive Publication Date: 2019-06-25NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
Publication Date
2019-06-25
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to the technical field of steel metallurgy, in particular to an oxygen converter high-pressure injection limestone powder slagging and dephosphorization method. According to thescheme, the method comprises the following steps that S1, the following raw materials of, by weight, 20-80 parts of iron raw material (iron powder, pig iron and ladles) and 2-8 parts of limestone powder are prepared; S2, the iron raw materials are placed in a molten iron container, molten iron is formed, and the temperature of the molten iron is controlled to be 1350 DEG C to 1500 DEG C; S3, the 2-8 parts of limestone powder is injected into the molten iron through an oxygen lance with carrier gas as a carrier, and the injection time is 0.5 min to 30 min; and S4, a finished product is subjected to temperature measurement and sampling analysis. Through the decomposition characteristics of limestone and advantages of injection metallurgy, products formed by decomposition after the limestoneis rapidly heated are effectively utilized, CaO participates in the slagging and dephosphorization process, CO2 and C, Si, Mn and other elements in the molten iron react, generate CO and can be continuously used, and thus the method has the advantages of low investment cost and high efficiency.
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Description

technical field

[0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for slagging and dephosphorization by high-pressure injection of limestone powder into an oxygen converter. Background technique

[0002] Slagging is a crucial link in the converter process. The purpose of converter slagging is to remove phosphorus and sulfur in molten iron. Therefore, the effect of slagging directly affects the effect of converters on removing impurity elements in molten iron. The materials required for current converter slagging include lime, fluorspar, dolomite, iron ore, and synthetic slagging agents. Lime is used as a slagging raw material, and its main component is CaO. The activity of lime directly determines the slagging situation. The oxygen supply time of oxygen converter steelmaking is generally only ten minutes. During this period, the converter must form a slag with a certain alkalinity, good fluidity, reasonable oxidation,...

Claims

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