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A method for suppressing splashing in the early stage of converter smelting

A converter smelting and smelting furnace technology, applied in the manufacture of converters, lime production and other directions, can solve the problems of iron-containing slag spraying out of the furnace, splashing, metal loss, etc., to ensure the safety of equipment and personnel, and reduce the consumption of steel materials , the effect of reducing metal loss

Active Publication Date: 2020-06-16
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the initial slag formation in the early stage of smelting, the molten metal contains a large amount of gas from the reaction in the furnace. At the same time, the interface between the slag and the molten metal is not clear, and the slag is mixed with more metal components, and the reaction in the furnace proceeds. During the process, if splashing occurs, a large amount of iron-containing slag will be sprayed out of the furnace, resulting in metal loss
The temperature of the molten pool rises unevenly in the early stage of smelting, and the existing low-temperature dead angle will also cause splashing in the early stage when it collides with the high-temperature area

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Add steel scrap to the converter and mix it with molten iron to start a furnace of smelting production. After the equipment is ready, the blowing begins with lowering the gun and turning on the oxygen. The initial gun position uses a high gun position of 1850mm. Add the first batch of slag and ore after 1 minute and 30 seconds of blowing, among which, add 3200kg of lime, 1100kg of ore, and 1500kg of dolomite.

[0028] 2. After blowing starts, until 3 minutes after blowing, the position of the oxygen lance is lowered to 1550mm, and the oxygen pressure is raised to 0.85-0.88Mpa, which is the normal smelting level.

[0029] 3. When the blowing reaches 4 minutes and 15 seconds, raise the gun position by 200mm to 1750mm. The lifting process needs to ensure the accuracy and strictly follow the 200-300mm interval to avoid excessive lifting; then add lime to the furnace in 3 batches, each The batch is 350kg, and the interval between each batch is about 10 seconds; then qui...

Embodiment 2

[0033] 1. Add steel scrap to the converter and mix it with molten iron to start a furnace of smelting production. After the equipment is ready, the blowing begins with lowering the gun and turning on the oxygen. The initial gun position uses a high gun position of 1800mm. Add the first batch of slag and ore after 1 minute and 30 seconds of blowing, among which, add 3300kg of lime, 1150kg of ore, and 1500kg of dolomite.

[0034] 2. After blowing starts, until 3 minutes after blowing, the position of the oxygen lance is lowered to 1550mm, and the oxygen pressure is raised to 0.85-0.88Mpa, which is the normal smelting level.

[0035] 3. When the blowing reaches 4 minutes and 15 seconds, raise the gun position by 200mm to 1750mm. The lifting process needs to ensure the accuracy and strictly follow the 200-300mm interval to avoid excessive lifting; then add lime to the furnace in 3 batches, each The batch is 350kg, and the interval between each batch is about 10 seconds; then qui...

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Abstract

The invention belongs to the field of convertor steelmaking and in particular relates to a method for inhibiting splashing at an initial smelting period of a converter. The method comprises the following steps: 1) after starting a smelting furnace, lowering an oxygen lance into the converter and blowing through oxygen, wherein a whole lance height has a high-low-low trend; within 3 to 4min in a blowing process, lowering the lance height to a normal smelting lance height of 1550 to 1650mm from 1800 to 1900mm; meanwhile, improving oxygen pressure to 0.85 to 0.88MPa; (2) when blowing for 4 minutes and 10 seconds to 4 minutes and 30 seconds, starting to carry out operation changes including lance lifting, charging and decompression; 3) after step 2) is finished, improving bottom blowing flow;4) after all operations are finished, gradually lowering the lance height, improving the oxygen pressure and receiving the bottom blowing flow; adjusting to levels before the operation changes of step2); then starting to carry out smelting. According to the method provided by the invention, the stability of reaction in a smelting tank at the initial smelting period of the converter is ensured, and the problems that the splashing is generated when metallurgical power in the smelting tank is excessive or the temperature is raised relatively rapidly at an initial blowing period, especially iron-carrying smoking splashing is caused are avoided.

Description

technical field [0001] The invention belongs to the field of converter steelmaking, and in particular relates to a method for suppressing splashing in the early stage of converter smelting. Background technique [0002] Converter splashing is an important cause of metal loss in steelmaking. Since the initial slag formation in the early stage of smelting, the molten metal contains a large amount of gas from the reaction in the furnace. At the same time, the interface between the slag and the molten metal is not clear, and the slag is mixed with more metal components, and the reaction in the furnace proceeds. During the process, if splashing occurs, a large amount of iron-containing slag will be sprayed out of the furnace, resulting in metal loss. In the early stage of smelting, the temperature of the molten pool rises unevenly, and the existing low-temperature dead angle will also cause splashing in the early stage when it collides with the high-temperature area. In order t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/35
CPCC21C5/35Y02P40/40
Inventor 高志滨薛志段朋朋刘忠建
Owner SHANDONG IRON & STEEL CO LTD
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