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The Method of Producing High Phosphorus Steel in 180t Ore Furnace

A high-phosphorus steel and ore furnace technology, applied in the field of iron and steel metallurgy, can solve the problems of unfavorable iron and steel industry green, sustainable development, waste of mineral resources, high energy consumption, etc., and achieve the effects of reducing emissions, saving energy and reducing costs

Active Publication Date: 2016-08-24
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, this method removes most of the phosphorus in molten steel during the converter smelting process, and then adds ferrophosphorus alloy in the refining process, resulting in a large waste of mineral resources. On the other hand, the production of ferrophosphorus alloy is energy-intensive. Highly polluting process is not conducive to the green and sustainable development of the steel industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Taking a 180t top-bottom combined blown converter in a factory of Wuhan Iron and Steel as an example, the technical plan for producing high-phosphorus steel with high-phosphorus iron ore is as follows:

[0033] The phosphorus content in the molten iron is 0.08%, the sulfur content in the molten iron is 0.001% after desulfurization pretreatment, the temperature of the molten iron is 1250°C, and the silicon content in the molten iron is 0.4%; the TFe content in the high-phosphorus iron ore is 45%, and the P content is 0.8%, S content is 0.02%, CaO content is 15% SiO 2 The content is 20%.

[0034] (1) First load 2 tons of steel scrap into the converter, then pour the molten iron into the converter, add active lime to the furnace at a ratio of 10kg / t molten iron, add light-burned dolomite at a ratio of 2kg / t molten iron, and add 15kg / t molten iron After adding the high-phosphorite ore, start blowing oxygen at a gun position of 1.85 meters for 90 seconds to quickly melt the...

Embodiment 2

[0042] Taking a 180t top-bottom combined blown converter in a factory of Wuhan Iron and Steel as an example, the technical plan for producing high-phosphorus steel with high-phosphorus iron ore is as follows:

[0043] The temperature of the molten iron is 1400°C, the phosphorus content of the molten iron is 0.12%, the sulfur content of the molten iron after desulfurization pretreatment is 0.002%, and the silicon content of the molten iron is 1.0%; the TFe content in the high-phosphorus iron ore is 35%, and the P content is 1.0%, S content is 0.06%, CaO content is 8%, SiO 2 The content is 10%.

[0044] (1) First load 3 tons of steel scrap into the converter, then pour the molten iron into the converter, add active lime to the furnace at a ratio of 20kg / t molten iron, add light-burned dolomite at a ratio of 4kg / t molten iron, and add 30kg / t molten iron After adding the high-phosphorite ore, start blowing oxygen at a gun position of 1.85 meters for 120s to rapidly melt the high-...

Embodiment 3

[0052] Taking a 180t top-bottom combined blown converter in a factory of Wuhan Iron and Steel as an example, the technical plan for producing high-phosphorus steel with high-phosphorus iron ore is as follows:

[0053] The temperature of the molten iron is 1399°C, the phosphorus content of the molten iron is 0.11%, the sulfur content of the molten iron after desulfurization pretreatment is 0.0015%, and the silicon content of the molten iron is 0.41%; the TFe content in the high-phosphorus iron ore is 40%, and the P content is 0.9%, S content is 0.04%, CaO content is 12%, SiO 2 The content is 12%.

[0054] (1) First put 2.5 tons of steel scrap into the converter, then put the molten iron into the converter, add active lime into the furnace at a ratio of 16kg / t molten iron, add light-burned dolomite at a ratio of 3kg / t molten iron, and add 28kg / t molten iron After adding the high-phosphorite ore, start blowing oxygen at a gun position of 1.85 meters for 110s to rapidly melt the ...

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Abstract

The invention provides a method for producing high phosphorus steel in a 180-tonnage ore furnace. The method comprises the following steps: (1) adding molten iron at the temperature of over 1250 DEG C into a converter, adding active lime, lightly calcined dolomite and high-phosphorus iron ore into the converter, and performing 1.85m lance position oxygen blowing for 90-120 seconds, so that the high-phosphorus iron ore and lime are rapidly molten; (2) adding the active lime, performing 1.7m lance position oxygen blowing to 300-350 seconds, adding the high-phosphorus iron ore, and maintaining 1.8m lance position oxygen blowing to 450 seconds; and (3) finally, reducing the lance position to 1.65m, continuously blowing to 900-930 seconds, finally adjusting the final temperature to 1660-1690 DEG C, controlling the carbon content of the final molten steel to be 0.08-0.1 percent, ending the temperature, and tapping according to the conventional program, thereby obtaining the high phosphorus steel. According to the method disclosed by the invention, a common converter smelting process is taken as the basis, massive raw ore of the high-phosphorus iron ore is added to the converter for reaction, and the high phosphorus steel is directly produced.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and specifically refers to a method for producing high-phosphorus steel in a 180t mine furnace. Background technique [0002] Since 1996, China has become the country with the largest steel output in the world. China's steel production capacity has reached 1.2 billion tons in 2013, accounting for about 50% of the world's total steel production capacity and more than 44% of the total output. Since 2011, domestic The situation of structural overcapacity of steel production capacity and rapid decline in demand growth began to emerge and continued to develop into a deeper crisis. Due to the benign demand growth around the world, squeezed by high international iron ore prices and finished product prices under severe market competition, China's iron and steel industry has entered a period of strategic transformation in which there is overall overcapacity, meager profits and even losses in the e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/30
Inventor 官计生杨治争严翔付勇涛朱丛茂洪霞尹云洋何亚元丁金发陈昊周千学刘武群
Owner 武汉钢铁有限公司