Method for dephosphorizing by blowing lime powder in electric furnace

A lime powder and electric furnace technology, applied in electric furnaces, lime production, furnaces, etc., can solve the problems of high lime consumption and unstable production rhythm, and achieve the effects of reducing lime consumption, improving lime utilization rate, and reducing smelting power consumption.

Inactive Publication Date: 2021-02-02
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the high lime consumption and unstable production rhythm caused by the addition of lime to the electric furnace are solved.

Method used

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  • Method for dephosphorizing by blowing lime powder in electric furnace
  • Method for dephosphorizing by blowing lime powder in electric furnace
  • Method for dephosphorizing by blowing lime powder in electric furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The type of steel smelted in an electric furnace is 42CrMoA, and 1.2 tons of lime is added from the ingredients along with the iron and steel material. In the early stage of smelting, it is operated according to the high-iron ratio oxygen supply model. After the end, turn on the decarburization heating mode. When the temperature is higher than 1540 ° C, the molten oxygen is taken for analysis. A total of 37 heats were tested

[0018]

Embodiment 2

[0020] The type of steel smelted in an electric furnace is 22CrMoH, and 1.0 tons of lime is added from the ingredients along with the iron and steel material. The early stage of smelting is operated according to the high-hot metal ratio oxygen supply model. When the temperature reaches 1470-1495 ° C, the low-oxygen mode is turned on and 200 kg of lime powder is injected; After the end, turn on the decarburization heating mode. When the temperature is higher than 1540 ° C, the molten oxygen is taken for analysis. A total of 42 heats were tested

[0021]

[0022] Experimental data obtained by embodiment 1 and embodiment 2 and prior existing production process data analysis contrast

[0023]

[0024] It can be seen from the above table that the present invention adopts the lime powder injection process to effectively improve the dephosphorization efficiency of the electric furnace, reduce lime consumption, and eliminate the influence of additional lime on the production rhy...

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Abstract

The invention relates to the field of electric furnace steelmaking, in particular to a method for dephosphorizing by blowing lime powder. The method comprises the following steps: in the early stage of smelting, when the smelting temperature in an electric furnace is 1470-1500 DEG C, starting a low-oxygen mode, and blowing the lime powder with the particle size of 0-10mm into the electric furnace;and after powder blowing is finished, adjusting the oxygen supply amount to 5000-5500 Nm < 3 >/h, and conducting stirring for dephosphorization. According to the method, lime consumption is effectively reduced, so that the increase of steel and iron material consumption and smelting power consumption caused by high lime consumption is reduced.

Description

technical field [0001] The invention relates to the field of electric furnace steelmaking, in particular to a method for dephosphorizing by spraying lime powder. Background technique [0002] Lime is the most widely used slagging material in the steelmaking process, and its consumption directly affects the economic and technical indicators of steelmaking. The development of my country's advanced manufacturing industry has put forward new requirements for the steel industry, and the requirements for steel quality are getting higher and higher, especially for the content of harmful elements such as phosphorus and sulfur in steel. In the existing electric furnace smelting process, the smelting lime is mainly added from the material tank together with the steel material at one time. If the smelted phosphorus in the electric furnace is high, some electric furnaces equipped with an automatic feeding system can add lime to the furnace through the automatic feeding system. The elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/52C21C7/064
CPCC21C5/52C21C5/527C21C7/064Y02P10/20Y02P40/40
Inventor 黄涛石红燕周昊叶飞来郭斌
Owner SHANDONG IRON & STEEL CO LTD
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