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Method for smelting low-phosphor steel based on high-silicon molten iron converter double-slag process

A double-slag method, low-phosphorus steel technology, applied in the field of iron and steel smelting, can solve the problems of rising molten pool temperature, early carbon-oxygen reaction, difficulty in smelting, etc. Effect

Active Publication Date: 2019-08-13
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

The silicon content in molten iron is too high, which brings great difficulties to smelting. A large amount of silicon is oxidized in the early stage, resulting in a much higher amount of slag than normal molten iron, and the oxidation of silicon is a strong exothermic reaction, which easily causes the temperature of the molten pool to rise rapidly , the carbon-oxygen reaction proceeds ahead of time, eventually causing severe spattering

Method used

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  • Method for smelting low-phosphor steel based on high-silicon molten iron converter double-slag process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The Si content of the molten iron is 1.23%, the C content of the molten iron is 4.37%, the P content of the molten iron is 0.165%, the temperature of the molten iron is 1322°C, and the converter double slag method is used for operation. According to the Si content of molten iron, the amount of molten iron in the desiliconization furnace is set to 100t, the amount of scrap steel to be loaded is 28t, and the oxygen supply in the early stage is set to 2000Nm 3 o 2 , the total oxygen supply is set to 6000Nm 3 o 2 .

[0058] Add 4.43kg / t of lime and 4.50kg / t of dolomite before blowing, add 17.56kg / t of lime, 7.35kg / t of dolomite and 8.15kg / t of iron ore before blowing 30% oxygen. When the amount of oxygen blowing reaches the set value, the gun is lifted and the furnace is turned down to discharge the acid slag in the early stage. The primary furnace temperature is 1330°C, the silicon content is 0.132%, the carbon content is 3.18%, and the phosphorus content is 0.135%. A...

Embodiment 2

[0068] Compared with Example 1, this experimental example is only different in the silicon content of molten iron, the scrap ratio, the addition of smelting slag, the tapping temperature, and the carbon and phosphorus content at the end point. The Si content of the molten iron is 1.10%, the C content of the molten iron is 4.53%, the P content of the molten iron is 0.132%, the temperature of the molten iron is 1321°C, and the double slag method of the converter is used for operation.

[0069] The Si content of molten iron in this heat is 1.10%, so the steel scrap ratio is lower than the setting, the charging amount of molten iron is set at 100t, the charging amount of scrap steel is set at 25t, and the oxygen supply in the early stage is set at 1900Nm 3 o 2 , the total oxygen supply is set to 6000Nm 3 o 2 .

[0070] Add 4.41kg / t of lime and 4.50kg / t of dolomite before blowing, and add 15.12kg / t of lime, 5.75kg / t of dolomite and 6.42kg / t of iron ore before 30% oxygen blowing....

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Abstract

The invention provides a method for smelting low-phosphor steel based on a high-silicon molten iron converter double-slag process, and relates to the technical field of steel smelting. The method caneffectively improve sable performance of smelting of the high-silicon molten iron converter double-slag process, reduces occurrence of a splashing phenomenon, increases a phosphor removal rate of a desilicication furnace, reduces slag consumption and reduces the production cost. A slag-retaining double-slag process is adopted; a steel scrap ratio and auxiliary material adding are reasonably controlled at the early stage of smelting, and the temperature in the furnace stably increases by utilizing heat released by oxidizing reaction of silicon, so that splashing is reduced; once furnace pouringopportunity is controlled by oxygen blowing amount; and after dropping to a gun position for a second time, the final point components and the temperature are controlled by controlling an oxygen gunand auxiliary material adding, so that the requirements on phosphor content of low-phosphor steel are achieved. The technical scheme provided by the invention is suitable for a low-phosphor steel smelting process.

Description

[0001] 【Technical field】 [0002] The invention relates to the technical field of iron and steel smelting, in particular to a method for smelting low-phosphorus steel based on the high-silicon molten iron double-slag method. [0003] 【Background technique】 [0004] Smelting reduction ironmaking technology, the furnace temperature is about 200°C higher than that of the traditional blast furnace ironmaking process, and the silicon in the raw materials into the furnace is fully reduced, resulting in a silicon content of 0.8-1.5% in the molten iron. If high phosphorus ore is used, the phosphorus content of the molten iron It will even reach between 0.150 and 0.180%. Using the traditional converter double-slag smelting process, lifting the gun after the silicon is basically oxidized in the early stage will cause the temperature of the molten pool to be too high. [0005] When producing low-phosphorus steel, the final phosphorus needs to be controlled within 0.012%. The silicon con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/35C21C5/36
CPCC21C5/35C21C5/36Y02P10/20
Inventor 李晶戴雨翔闫威宋沈杨肖龙鑫
Owner UNIV OF SCI & TECH BEIJING
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