Bottom-powder-spraying molten steel refining device with heating function

A heating device and powder spraying technology, applied in the field of iron and steel refining, can solve the problems of low production efficiency of the molten steel temperature drop and ladle furnace refining technology, and achieve the effects of promoting the development of automation, reducing the labor of workers and increasing the production output.

Inactive Publication Date: 2018-10-16
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of the temperature drop of molten steel after powder spraying in the existing ladle furnace refining technology and the low production efficiency of the ladle furnace refining technology, the invention provides a device for refining molten steel with bottom powder spraying with heating function

Method used

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  • Bottom-powder-spraying molten steel refining device with heating function
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  • Bottom-powder-spraying molten steel refining device with heating function

Examples

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Effect test

Embodiment 1

[0032] Such as figure 1 Shown is a bottom spray powder refining molten steel device with heating function of the present invention, including: a ladle for refining molten steel, a heating device for heating the ladle, and a gas and powder for passing into the ladle The powder spraying device 4; the heating device is set inside the ladle, the upper part of the molten steel, and the powder spraying device 4 is set at the bottom of the ladle. The heating device in this embodiment includes three heating electrodes 1, and the heating electrodes 1 pass through the water-cooled furnace cover 2 through the electrode holes on the water-cooled furnace cover 2 to enter the interior of the ladle.

[0033] The ladle includes a ladle body 3 and a water-cooled furnace cover 2. The radius of the bottom of the ladle body 3 is R; the water-cooled furnace cover 2 is arranged above the ladle body 3; the water-cooled furnace cover 2 is provided with an observation hole 5 for observing the inside of th...

Embodiment 2

[0041] When the device for refining molten steel of the present invention is used for refining molten steel, the specific process is as follows:

[0042] First, after installing the device for refining molten steel on the ladle car, connect the powder spraying system to the accumulator 44 through the quick plug 46. The powder spraying system adopts the powder spraying system of the traditional ladle furnace heating and refining process, and the powder spraying is turned on The gas valve of the system adjusts the argon flow into the ladle body 3, lowers the water-cooled furnace cover 2, and adjusts the input current and voltage according to the measured temperature and the requirements of the steel type to ensure that the heating electrode 1 passes through the water-cooled furnace cover 2. The hole of the electrode penetrates the water-cooled furnace cover 2 and is suspended on the molten steel surface by 100mm-120mm, and the heating electrode 1 is energized to heat the ladle body ...

Embodiment 3

[0046] This embodiment adopts figure 1 The shown device for refining molten steel performs molten steel refining, the number of powder spraying devices 4 in this embodiment is one, such as Figure 4 Shown is a schematic diagram of the distribution of a powder spraying device according to an embodiment of the present invention. The powder spraying device 4 is arranged in an area with a radius of 0.5R at the bottom of the ladle body 3, and the center of this area is the center of the bottom of the ladle body 3.

[0047] In this embodiment, the powder spraying element body 42 is a truncated cone-shaped straight cylinder type air-permeable brick. The maximum diameter of the truncated cone-shaped straight cylinder ventilating brick is 120mm, the diameter of the holes 43 in the truncated cone-shaped straight cylinder ventilating brick is 0.2mm;

[0048] In this embodiment, passivated lime is used as the powder, the particle size of the powder is 200-600 mesh, the pressure of dry argon is...

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Abstract

The invention provides a bottom-powder-spraying molten steel refining device with a heating function. The device comprises a steel ladle for refining molten steel, a heating device for heating the steel ladle and a powder spraying device used for introducing gas and powder into the steel ladle. The heating device is arranged inside the steel ladle and located on the upper portion of the molten steel, and the powder spraying device is arranged at the bottom of the steel ladle. According to the molten steel refining device, the powder is pneumatically conveyed from the bottom of the steel ladleinto the steel ladle, therefore, the molten steel in the steel ladle can achieve thorough contact from the bottom to the top, the defects that steel slag reaction conditions are poor and feeding is difficult inside traditional steel ladle heating refining furnaces are overcome, the problem that the temperature is reduced in the steel ladle bottom powder spraying smelting process is solved, the desulphurization efficiency is improved, the steel grade quality is improved, the smelting period is shortened, no splash is produced in the powder spraying process, and refining safety is improved. By the adoption of the molten steel refining device, the refining speed is increased, consumption of electric energy, electrodes and argon is reduced, the production rhythm is improved, the production isincreased, and the cost is reduced.

Description

Technical field [0001] The invention relates to the technical field of steel refining, in particular to a device for refining molten steel by powder spraying with a heating function. Background technique [0002] Steel refining routinely adopts the ladle furnace refining method, which implements the reduction period of the electric furnace in the converter process, so that the converter steel can be reduced and refined, so the quality of the steel can be improved and new steel grades can be produced. The ladle heating refining furnace mainly relies on the white slag in the ladle. In a low-oxygen atmosphere (oxygen content 5%), argon is blown into the ladle to stir and the molten steel passing through the primary furnace is heated by graphite electrodes for refining. Gas agitation accelerates the reaction at the slag-steel interface. Arc heating is used for temperature compensation and requires a longer smelting time to reduce the sulfur content in the steel. It is suitable for al...

Claims

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Application Information

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IPC IPC(8): C21C7/04
CPCC21C7/04C21C7/0037
Inventor 朱苗勇娄文涛刘壮邓志银王晓雨
Owner NORTHEASTERN UNIV
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