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Rapid desulfurization refining method for ladle furnace

A ladle refining furnace and ladle technology, applied in the field of steelmaking, can solve the problems of prolonged processing time, time consuming, and poor kinetic conditions, so as to accelerate the desulfurization speed, increase the stirring intensity, and increase the utilization rate of the desulfurizing agent. Effect

Inactive Publication Date: 2012-04-25
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 2) After a large amount of slag is added, the LF refining process will take time to perform temperature compensation for temperature loss due to slag removal, prolonging the processing time;
[0008] 5) When using the existing technology for desulfurization, only bottom blowing argon is used for stirring operation, and the kinetic conditions cannot be poor, so the method of prolonging the desulfurization time can only be used for desulfurization;

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: The sulfur content at the end point of LF treatment is required to be 5 ppm.

[0031] 1) The initial temperature of LF treatment is 1570-1585°C;

[0032] 2) After connecting the argon blowing device of the LF ladle, stir the argon gas for 3 minutes, measure the temperature and take samples;

[0033] 3) Put 600kg of synthetic slag, 400kg of aluminum slag and 400kg of lime weighed in advance into the ladle, and immediately start to heat up rapidly;

[0034] 4) Maintain a heating rate of 4°C / min, and keep the flow rate of argon blowing at the bottom of the ladle at 10-30Nm 3 / h, the temperature is adjusted to 1635°C;

[0035] 5) Start the desulfurization spraying gun, insert the powder spraying desulfurization gun into the molten steel surface, the insertion depth is 1000mm from the bottom of the ladle; start spraying the desulfurizing agent, and carry out the powder spraying desulfurization of molten steel.

[0036] 6) After powder spraying, switch the powde...

Embodiment 2

[0039] Example 2: The sulfur content at the end point of LF treatment is required to be 10 ppm.

[0040] 1) The initial temperature of LF treatment is 1570-1585°C;

[0041] 2) After connecting the argon blowing device of the LF ladle, stir the argon gas for 3 minutes, measure the temperature and take samples;

[0042] 3) Put 600kg of synthetic slag, 400kg of aluminum slag and 400kg of lime weighed in advance into the ladle, and immediately start to heat up rapidly;

[0043] 4) Maintain a heating rate of 4°C / min, and keep the flow rate of argon blowing at the bottom of the ladle at 5-30Nm 3 / h, the temperature is adjusted to 1635°C;

[0044] 5) Start the desulfurization spraying gun, insert the powder spraying desulfurization gun into the molten steel surface, the insertion depth is 1000mm from the bottom of the ladle; start spraying the desulfurizing agent, and carry out the powder spraying desulfurization of molten steel.

[0045] 6) After powder spraying, switch the powde...

Embodiment 3

[0048] Example 3: The sulfur content at the end point of LF treatment is required to be 25 ppm.

[0049] 1) The initial temperature of LF treatment is 1570-1585°C;

[0050] 2) After connecting the argon blowing device of the LF ladle, stir the argon gas for 3 minutes, measure the temperature and take samples;

[0051] 3) Put 600kg of synthetic slag, 400kg of aluminum slag and 400kg of lime weighed in advance into the ladle, and immediately start to heat up rapidly;

[0052] 4) Maintain a heating rate of 4°C / min, and keep the flow rate of argon blowing at the bottom of the ladle at 10Nm 3 / h, the temperature is adjusted to 1635°C;

[0053] 5) Adjust the flow rate of argon blowing at the bottom of the ladle to 15-25Nm 3 / h, using strong stirring desulfurization operation, the operation time is 5 to 15 minutes.

[0054] 6) After the desulfurization is completed, the ladle bottom blowing flow rate is adjusted to 8 ~ 12Nm 3 / h, according to the specific requirements of other co...

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Abstract

The invention discloses a rapid desulfurization refining method for a ladle furnace (LF). The method comprises the following steps of: 1) performing desulfurization refining in the LF, wherein the LF treatment starting temperature is between 1,570 and 1,605 DEG C; 2) after a ladle argon blowing device of the LF is turned on, blowing argon from the bottom of the ladle; 3) after finishing adjustingthe temperature, inserting a desulfurization powder spraying gun into a molten steel liquid for spraying a desulfurizing agent; 4) after finishing spraying powder, switching the spraying gun to a functional stage of blowing the argon, blowing the argon from the top, simultaneously blowing the argon from the bottom of the ladle, and performing strong stirring desulfurization operation; 5) alloying, namely after desulfurization is finished, lifting the desulfurization powder spraying gun, adjusting a ladle bottom blowing flow, and performing alloy configuration to meet a target requirement on final components of a steel grade; and 6) after finishing adjusting components, performing soft stirring operation, measuring the temperature, sampling, and turning off the ladle argon blowing device to finish treating. The method realizes rapid desulfurization of the LF, and can shorten an overall melting cycle and improve the number of continuous casting furnaces and production efficiency.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a fast desulfurization refining method for a ladle refining furnace. Background technique [0002] Ladle refining furnace (LF furnace, LADLE FURNACE) is the main refining equipment outside the furnace in steel production. Its main tasks are: ①Desulfurization, ②Temperature regulation, ③Precise composition fine-tuning, ④Improve the purity of molten steel, ⑤Slagging. [0003] Existing ladle refining furnaces are generally used for pretreatment and desulfurization of molten iron. In terms of desulfurization smelting process of LF furnace, the existing technology mainly adopts the method of reducing slag by adding a large amount of synthetic slag, lime and aluminum slag. The disadvantages of this technology mainly include: [0004] 1) Adding a large amount of slag (addition amount is about 12-20kg / t) to manufacture reducing slag, which makes LF need to spend a lot of time for sla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064
Inventor 李波蒋兴元池和冰顾学红徐俊李实
Owner BAOSHAN IRON & STEEL CO LTD
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