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Method for recycling scrap steel by utilizing LF refining furnace

A refining furnace and steel scrap technology, which is applied in the field of iron and steel smelting, can solve the problems of low scrap addition ratio and absorption rate, scrap accumulation environment, pollution, etc., and achieve the effects of reducing the accumulation of scrap steel, simple operation, and easy popularization and application

Inactive Publication Date: 2021-04-30
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of the existing scrap steel returning to furnace steelmaking process, which have low scrap addition ratio and low absorption rate, resulting in a large amount of scrap steel accumulation and serious environmental pollution, the present invention provides a method of using LF refining furnace to recycle scrap steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of method that utilizes LF refining furnace to eat back steel scrap, concrete steps are:

[0028] Rolling mill steel bar cutting head (scrap steel) is packaged into bundles (the weight of each bundle of scrap steel is 1 ton), and the scrap steel includes the following components in mass percentage: C: 0.23%, Si: 0.022%, Mn: 1.27%, S: 0.11% , P: 0.03%, V: 0.033%, and the rest are Fe and unavoidable impurities.

[0029] The 120-ton steelmaking system smelts HRB400E, with a tapping capacity of 126 tons and a ladle clearance of 600mm for tapping from the converter. The entering temperature of the LF furnace of the ladle is 1573°C, 285kg of lime is added, the temperature of the electrolytic slag is raised by the lower electrode, and the temperature of the molten steel is measured for 9 minutes. Mn: 1.21%; S: 0.037%; P: 0.024%; V: 0.005%. Adjust the argon gas flow rate to 130NL / min, open the ladle to the lifting position, and use the crane to hoist 8 bundles of scrap...

Embodiment 2

[0034] A kind of method that utilizes LF refining furnace to eat back steel scrap, concrete steps are:

[0035] Rolling mill reinforcing bar cutting head (scrap steel) is packed into bundle (the weight of every bundle of scrap steel is 1.5 tons), and the composition of scrap steel is identical with embodiment 1.

[0036] The 120-ton steelmaking system smelts HRB400E, with a tapping capacity of 123 tons and a ladle clearance of 700mm for tapping from the converter. The entering temperature of the LF furnace of the ladle is 1561°C, add 241kg of lime, lower the temperature of the electrolytic slag, heat up for 6 minutes, and measure the temperature of the molten steel at 1589°C. The detected components and mass content of the molten steel are: C: 0.22%; Si: 0.21%; Mn: 1.23%; S: 0.033%; P: 0.026%; V: 0.005%. Adjust the argon flow rate to 150NL / min, open the ladle to the ladle position, and use the crane to hoist 9 bundles of scrap steel into the ladle (the amount of scrap steel a...

Embodiment 3

[0041] A kind of method that utilizes LF refining furnace to eat back steel scrap, concrete steps are:

[0042] Rolling mill reinforcing bar cutting head (scrap steel) is packed into bundle (the weight of every bundle of scrap steel is 1.2 tons), and the composition of scrap steel is identical with embodiment 1.

[0043]The 120-ton steelmaking system smelts HRB400E, with a tapping capacity of 124 tons and a ladle clearance of 800mm for tapping from the converter. The entering temperature of the LF furnace of the ladle is 1567°C, 224kg of lime is added, the temperature of the electrolytic slag is raised, and the temperature of the molten steel is measured for 7 minutes. Mn: 1.34%; S: 0.033%; P: 0.023%; V: 0.068%. Adjust the argon flow rate to 140NL / min, open the ladle to the ladle position, and use the crane to hoist 8 bundles of scrap steel into the ladle (the amount of scrap steel added is 74kg / ton of steel).

[0044] After the molten steel fuses the iron wire binding the s...

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Abstract

The invention relates to the technical field of iron and steel smelting, and particularly discloses a method for recycling scrap steel by utilizing an LF refining furnace. The method for recycling the scrap steel by utilizing the LF refining furnace comprises the following steps that a, the clearance of a steel ladle for converter tapping is controlled to be 600-800mm, entering an LF furnace treatment position is carried out, slagging and heating are carried out, the steel ladle is transferred to an LF furnace ladle hanging position, argon is introduced, and 50-80kg / ton of scrap steel is added; b, the steel ladle is transferred to an LF furnace heating position, first-time component fine adjustment is carried out on molten steel in the steel ladle, argon is introduced, and stirring is carried out till the steel scrap is completely molten; and c, the molten steel in the steel ladle is heated to 1510-1570 DEG C, secondary component fine adjustment is carried out, and the LF refining process is completed. According to the method, the absorptivity of the scrap steel and the absorptivity of beneficial elements are remarkably improved, the operation is easy, only one-time scrap steel input procedure is needed, completion can be achieved on original equipment, and application and popularization are easy.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a method for recycling steel scrap by utilizing an LF refining furnace. Background technique [0002] Scrap steel is an iron resource that can be recycled. Recycling it for circular steelmaking can greatly reduce environmental pollution and comprehensive energy consumption, and help to solve the current problems of resource shortage and serious environmental pollution in the steel industry. [0003] The current steel scrap recycling mainly adopts electric furnace process and blast furnace-converter process. However, using these two current processes for steel scrap recycling, the absorption rate of scrap steel is only 20-30%, resulting in the gradual accumulation and increase of scrap steel stock, which will not only cause damage to the environment, but also a huge waste of resources. At the same time, there is oxidation of beneficial alloying elements in steel s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/56C21C7/06C21C7/064C21C7/072
CPCC21C5/562C21C7/06C21C7/064C21C7/072Y02P10/20
Inventor 滕广义王金星郑力飞孔超沈阳牛志涛
Owner HEBEI IRON AND STEEL
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