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Residue splashing method for stabilizing converter hearth residue thickness under low-residue smelting condition

A technology of slag-less smelting and converter bottom, which is applied in the manufacture of converters, etc., can solve the problems of increased smelting costs, converter bottom erosion, and failure to arrange key varieties, so as to reduce raw material consumption, increase metal yield, and achieve good The effect of the cooling effect

Active Publication Date: 2015-01-14
SHOUGANG JINGTANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The amount of slag in the converter is small, and the slag at the end of the smelting variety is highly oxidizable, resulting in the middle and late stages of the furnace service (the age of the furnace is greater than 4000 furnaces), the bottom of the converter, especially the position of the bottom blowing hole, is severely eroded, and some or even all of the bottom blowing holes are often forced to close. Not only does the cost of smelting increase, but also key products such as automobile sheets and high-grade pipeline steel cannot be arranged, which makes the production organization in a passive situation

Method used

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  • Residue splashing method for stabilizing converter hearth residue thickness under low-residue smelting condition
  • Residue splashing method for stabilizing converter hearth residue thickness under low-residue smelting condition

Examples

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Effect test

Embodiment 1

[0019] The 300-ton converter smelting SPHC steel grade adopts the RH light treatment process route; the oxygen at the end of the converter is 450ppm, and the slag splashing scheme is adopted: before slag splashing, 998kg of magnesium carbon balls are added to the furnace, and the slag splashing opening blowing gun position is 2.5m; blowing is started for 15s Finally, add raw dolomite 1532kg, lightly burned dolomite 651kg, the oxygen lance drops to 1.2m when the slag is splashed for 90s, and add raw dolomite 336kg when the slag is splashed for 150s. The gun position is constant at 1.0m, the oxygen gun rises to 2.5m when the slag is splashed for 250s, and the slag is discharged when the slag is splashed for 300s. Among them, the oxygen lance adopts a six-hole tapered oxygen lance, the Mach number of the nozzle is 2.1, and the flow rate of nitrogen in the splashing slag is 1000Nm3 / min.

[0020] Process situation: The slag splashing effect is good during the process, and a large n...

Embodiment 2

[0023] The 300-ton converter smelts X80 steel using the LF process route; the oxygen at the end of the converter is 892ppm, and the slag splashing scheme is adopted: add 1490kg of magnesium carbon balls and 885kg of coke into the furnace in advance before slag splashing, and the blowing gun position for slag splashing is 2.5m; After 15s, add raw dolomite 2120kg, lightly burnt dolomite 994kg, oxygen lance drops to 1.2m when slag splashing 90s, add raw dolomite 300-500kg when slag splashing 150s, in order to ensure the effect of slag splashing at the lower part of the furnace, slag splashing 150s The position of the rear oxygen lance is constant at 1.3m, the oxygen lance rises to 2.5m when the slag is splashed for 250s, and the slag is discharged when the slag is splashed for 300s. Among them, the oxygen lance adopts a six-hole tapered oxygen lance, the Mach number of the nozzle is 2.1, and the flow rate of nitrogen in the splashing slag is 1000Nm3 / min.

[0024] Process situatio...

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Abstract

The invention provides a residue splashing method for stabilizing converter hearth residue thickness under a low-residue smelting condition, which is a residue splashing operation after 300-ton converter smelting steel-tapping is completed. The residue splashing method comprises the following steps of: adopting a six-pore taper oxygen lance, wherein the mach number of a spray head is 2.1, and the flow rate of the residue splashing nitrogen gas is 1000Nm / minute; and selecting different residue splashing schemes according to the difference of final-point oxygen content of the converter. According to the residue splashing method for stabilizing converter hearth residue thickness under the low-residue smelting condition disclosed by the invention, by optimizing the residue splashing gun position and optimizing the proportion of the slag preparing agent, the hearth erosion in the converter smelting is reduced, the residue thickness at the converter hearth is stabilized, the material consumption is lowered and the cost is saved.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, in particular to a slag splashing method for stabilizing the residual thickness of the converter bottom under the condition of less slag smelting. Background technique [0002] At present, the competition among iron and steel enterprises is becoming increasingly fierce. In this situation, it is particularly important to reduce consumption and control production costs. A good converter bottom blowing effect can effectively improve the metallurgical conditions of the converter smelting process, and promote the reaction to be close to the equilibrium state, thereby reducing blowing loss, increasing metal yield, reducing raw material consumption, and optimizing molten steel quality. [0003] The current "full three removal" slag-less smelting process, the converter bottom blowing system adopts non-replaceable large-pan bottom blowing guns, and the production varieties are mainly low-carbon and ul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/36C21C5/44
Inventor 罗伯钢李金柱苏震霆张丙龙田志红袁天祥高宠光王建斌边吉明李勇郭小龙
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD