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Converter slag stability modifier and application method thereof

A converter steel slag and modifier technology, which is applied in the fields of converter steel slag stability modifier and molten steel slag stability treatment, can solve problems such as unstable performance, interference of blast furnace slag composition, and great impact on subsequent utilization of blast furnace slag. Achieve stable performance, low cost, and achieve the effect of stabilization treatment

Active Publication Date: 2015-05-06
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large change in the composition of the converter slag, the composition of the blast furnace slag is significantly disturbed after the addition and the performance is unstable, which has a great impact on the subsequent utilization of the blast furnace slag

Method used

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  • Converter slag stability modifier and application method thereof
  • Converter slag stability modifier and application method thereof
  • Converter slag stability modifier and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Converter steel slag stability modifier is iron ore magnetic separation tailings slag, the main component is (mass percentage) SiO 2 : 71.95%, Al 2 o 3 : 6.12%, CaO: 4.95%, TFe: 4.50%, MgO: 3.4%, and the balance is impurities. The raw material particle size is less than 1mm.

[0031] Pack it into a 20kg pouch with a woven bag. When smelting Q235A steel grade, add 20% of the total amount of steel slag into the excess flux silo of the converter, and add it at one time after the molten steel is clean. Then, the gun was blown with oxygen for 2 minutes to carry out gas stirring, so that the materials were evenly mixed. Keep warm for 2 minutes. Then discharge the slag into the steel slag tank, the slag discharge temperature is 1610°C, the cooling rate of the slag tank is about 1°C per minute, and the time for the slag tank to keep ≥1500°C is about 110 minutes, so that the CaO in the converter steel slag continues to mix with the SiO in the modifier 2 , FeO and other aci...

Embodiment 2

[0033] Converter steel slag stability modifier is iron ore row rock, the main component is (mass percentage) SiO 2 : 93.46%, Al 2 o 3 : 0.62%, CaO: 0.05%, TFe: 0.50%, MgO: 0.02%, and the balance is impurities. The raw material particle size is less than 1mm.

[0034] Pack it into a 20kg pouch with a woven bag. When smelting Q235A steel, add 18% of the total amount of steel slag into the excess flux silo of the converter, and add it at one time after the molten steel is clean. Then, the gun was blown with oxygen for 1.5 minutes to carry out gas stirring, so that the materials were mixed evenly. Keep warm for 2 minutes. Then discharge the slag into the steel slag tank, the slag discharge temperature is 1600°C, the cooling rate of the slag tank is about 1°C per minute, and the time for the slag tank to maintain ≥1500°C is about 100 minutes, so that the CaO in the converter steel slag continues to mix with the SiO in the modifier 2, FeO and other acidic substances fully reac...

Embodiment 3

[0036] The batching scheme of converter steel slag stability modifier is shown in Table 1 (the balance is impurities).

[0037] Table 1 Batching scheme of converter steel slag stability modifier

[0038]

[0039] The raw material particle size is less than 1mm. When smelting X60 steel, the modifier is first added to the converter silo at a ratio of 9% of the total amount of steel slag, and then added to the converter at one time after the molten steel is clean. Then, the gun was blown with oxygen for 1 minute to carry out gas stirring, so that the materials were evenly mixed. Then discharge the slag into the steel slag tank, the slag discharge temperature is 1630°C, the cooling rate of the slag tank is about 1°C per minute, and the time for the slag tank to keep ≥1500°C is about 130 minutes, so that the CaO in the converter steel slag continues to mix with the SiO in the modifier 2 , FeO and other acidic substances fully react. Then the fully modified converter steel sla...

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Abstract

The invention provides a converter slag stability modifier and an application method thereof, wherein the modifier is a mixture composed of one or more from the group of iron ore tail slag, an iron ore rock dump and blast furnace slag, characterized in that the ingredients, by weight, are 28%-99% of SiO2, 0.01%-20% of Al2O3, 0.01%-20% of CaO, 0.01%-10% of MgO, and 0.01%-22% of TFe. The application method of the converter slag stability modifier comprises material preparing, material feeding, gas blowing stirring, slag tapping, steel slag graining, etc., making f-CaO <=1.5% and realizing stabilizing treatment for the converter slag.

Description

technical field [0001] The invention relates to the technical field of processing converter steel slag in the metallurgical industry, in particular to a converter steel slag stability modifier and a molten steel slag stability treatment method. Background technique [0002] Converter slag is used as waste slag during steelmaking, and generally accounts for about 20% of crude steel output. In recent years, with the rapid development of my country's iron and steel industry, the accumulation of steel slag has increased year by year, which not only occupies a large amount of land, but also causes serious environmental pollution. With the development of the national circular economy, it is required to realize the reuse of waste resources in the metallurgical industry, especially the reuse of metallurgical slag and waste gas has become the focus of circular economy in the metallurgical industry. The most critical factor for the comprehensive utilization of steel slag is the stabi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B3/06
CPCY02W30/50
Inventor 王向锋马光宇于淑娟孙建伦侯洪宇耿继双杨大正李卫东徐鹏飞
Owner ANGANG STEEL CO LTD
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