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

Inactive Publication Date: 2019-06-25
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the difficulty of slagging in the prior art by using massive limestone to make slag, and the CO produced by the decompo

Method used

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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] S1, prepare the following raw materials by weight: 20 parts of iron powder, 2 parts of limestone powder;

[0027] S2. Putting the iron powder in the above parts by weight into a corundum crucible to generate molten iron, the temperature of the molten iron is controlled at 1450°C, the carbon content in the molten iron is 4.5%, the Si content is 0.38%, the Mn content is 0.2%, and the P content is 0.1%;

[0028] S3, the above-mentioned weight part of limestone powder with N 2 The carrier is injected into molten iron through an oxygen lance, and the injection time is 10 minutes;

[0029] S4. Perform temperature measurement and sampling analysis on the finished product. The temperature of the molten iron is 1395° C., the carbon content of the molten iron is 4.32%, the Si content is 0.28%, the Mn content is 0.16%, and the P content is 0.08%.

Embodiment 2

[0031] S1. Prepare the following raw materials in parts by weight: 50 parts of pig iron block, 5 parts of limestone powder;

[0032] S2. Put the above-mentioned pig iron block into a vacuum induction furnace to generate molten iron, the temperature of the molten iron is controlled at 1500°C, the carbon content in the molten iron is 4.2%, the Si content is 0.3%, the Mn content is 0.2%, and the P content is 0.15%. ;

[0033] S3, the above-mentioned weight part of limestone powder with N 2 The carrier is injected into molten iron through an oxygen lance, and the injection time is 30 minutes;

[0034] S4. Perform temperature measurement and sampling analysis on the finished product. The temperature of the molten iron is 1442° C., the carbon content is 3.85%, the Si content is 0.12%, the Mn content is 0.08%, and the P content is 0.08%.

Embodiment 3

[0036] S1, prepare the following raw materials by weight: 80 parts of molten iron ladle;

[0037] S2. Putting the above-mentioned ferrous raw materials in parts by weight into a molten iron container to generate molten iron, the temperature of the molten iron is controlled at 1432° C., wherein the carbon content in the molten iron is 4.2%, the Si content is 0.32%, and the P content is 0.12%;

[0038] S3, CO with a purity of 100% 2 In tons of iron 3Nm 3 The gas supply intensity is injected into the molten iron through the oxygen lance, and the injection time is 10 minutes;

[0039] S4. Carry out temperature measurement and sampling analysis on the finished product. The obtained molten iron has a temperature of 1401° C., a carbon content of 3.79%, a Si content of 0.14%, and a P content of 0.11%.

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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.

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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Application Information

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IPC IPC(8): C21C7/064C21C5/28
Inventor 李晨晓王书桓薛月凯赵定国艾立群孙鑫王黎光
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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