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A smelting method for reducing the unit consumption of molten iron

A smelting method and molten iron technology, applied in the field of iron and steel manufacturing, can solve the problem of high molten iron unit consumption, and achieve the effects of reducing molten iron unit consumption, facilitating operation, and reducing processes

Active Publication Date: 2021-09-24
湖南华菱涟源钢铁有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a smelting method that reduces the unit consumption of molten iron, aiming to solve the technical problem of high unit consumption of molten iron in the smelting method in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] This embodiment provides a smelting method for reducing the unit consumption of molten iron. The content of nitrogen is respectively controlled in the process of converter smelting→LF refining→slab continuous casting; specifically, it includes the following steps:

[0053] S1. Put molten iron and steel scrap into the converter, and then smelt in the converter. During the converter smelting process, adjust the oxygen flow rate of the oxygen lance, the position of the oxygen lance and the flow rate of the bottom blowing, and control the nitrogen content of the molten steel after the converter is tapped to be within 30ppm;

[0054] Among them, the furnace number of LF refining furnace is 9604046, the smelting steel type is 510L, the amount of molten iron added is 166 tons / furnace, the amount of scrap steel added is 66 tons / furnace, and the total charging amount is 232 tons / furnace;

[0055] The oxygen flow rate of the oxygen lance is 48000m 3 / h; when the progress of oxyge...

Embodiment 2

[0064] This embodiment provides a smelting method for reducing the unit consumption of molten iron, including converter smelting→RH refining→slab continuous casting process, controlling the nitrogen content in the converter smelting and slab continuous casting process, and controlling the total iron content in RH refining; Specifically include the following steps:

[0065] S1. Put molten iron and steel scrap into the converter, and then smelt in the converter, and adjust the oxygen flow rate of the oxygen lance, the position of the oxygen lance and the flow rate of the bottom blowing during the converter smelting process;

[0066] Among them, the furnace number of the RH refining furnace is 9504236, the smelting steel type is SPHE, the amount of molten iron added is 180 tons / furnace, the amount of scrap steel added is 60 tons / furnace, and the total charging amount is 240 tons / furnace;

[0067] The oxygen flow rate of the oxygen lance is 48000m 3 / h; when the oxygen blowing pr...

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Abstract

The invention provides a smelting method for reducing the unit consumption of molten iron, which sequentially includes converter smelting, LF refining or RH refining, and slab continuous casting; respectively controlling the nitrogen content in the processes of converter smelting, LF refining, and slab continuous casting; RH refining Control the total iron content in the process. The smelting method for reducing the unit consumption of molten iron provided by the present invention controls the nitrogen content in molten steel by optimizing the oxygen lance position, bottom blowing flow rate, end point control and tapping deoxidation process in the converter smelting process, as well as optimizing LF refining power transmission and argon flow rate , or optimize RH oxygen blowing cycle degassing, ladle top slag modification process to stabilize RH steel cleanliness, and slab continuous casting and pouring process, significantly reduce the unit consumption of molten iron under the premise of stabilizing the quality of molten steel, and finally on the 210-ton converter The unit consumption of molten iron in LF furnace is 770-800kg / t, and that in RH smelting is 830-860kg / t.

Description

technical field [0001] The invention belongs to the technical field of iron and steel manufacturing, in particular to a smelting method for reducing the unit consumption of molten iron. Background technique [0002] Iron and steel enterprises have been committed to reducing the unit consumption of molten iron to achieve the purpose of reducing costs, but in the process of reducing the unit consumption of molten iron, the heat of the converter is insufficient, and the proportion of supplementary blowing and overblowing has increased, which further restricts the reduction of the unit consumption of molten iron; the temperature of the converter is low LF The power transmission time is long, and the nitrogen content of molten steel is easy to exceed the standard. For ultra-low carbon steel grades to be treated by RH, the molten steel is prone to peroxidation when the unit consumption of molten iron is low, the T.Fe content of the final slag of the converter is high, and the oxida...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/34C21C7/00C21C7/076C21C7/072B22D11/117
CPCB22D11/117C21C5/34C21C7/00C21C7/072C21C7/076Y02P10/20
Inventor 刘彭徐刚军周军军隋亚飞邓之勋程绘兵谭大进陈杰戴智才
Owner 湖南华菱涟源钢铁有限公司