Molten iron desulphurization stirring paddle

Abstract

The utility model provides a molten iron desulphurization stirring paddle which comprises a flange, a stirring shaft and a paddle, the flange is fixed at one end of the stirring shaft, the paddle is fixed on a shaft body of the stirring shaft, the stirring shaft and the paddle are respectively composed of a metal inner core and a refractory material outer lining, the paddle is a double-layer paddle, radial inclination is formed between the two layers of paddles and the stirring shaft, and the two layers of paddles are fixed on the stirring shaft. Two layers of paddles are arranged on the stirring shaft, the inclination directions of the two layers of paddles are opposite, a plurality of raised turbulent dams are arranged on the stirring shaft above the upper layer of paddles, turbulent wings are arranged at the upper ends of the lower layer of paddles, and the turbulent wings are triangularly connected between the stirring shaft and the lower layer of paddles. The stirring head overcomes the defects of a traditional KR stirring head, adopts the double-layer stirring blade design and is additionally provided with the turbulence dam and the turbulence wings, so that the turbulence effect and stirring strength of molten iron are improved, the desulfurization efficiency and desulfurization effect are improved, the high-speed rotation time of the stirring head is shortened, and the service life of the stirring head is prolonged.

Description

Technical Field

[0001] This utility model relates to the technical field of desulfurization equipment for molten iron pretreatment in iron smelting, and in particular to a stirring paddle for molten iron desulfurization. Background Technology

[0002] The Kambara reactor desulfurization method is a mechanical stirring method for desulfurizing molten iron. Before entering the converter, the molten iron needs to undergo three desulfurization processes (desulfurization, dephosphorization, and desiliconization). A weighed desulfurizing agent is added to the surface of the molten iron. A KR stirring head, cast from refractory material, is inserted to a certain depth into the molten iron ladle and rotated, creating a V-shaped vortex on the surface of the molten iron. The added desulfurizing agent particles are dispersed by turbulence in the area at the tip of the blades and ejected radially, rotating around the axis to achieve contact, mixing, and agitation with the molten iron. After sufficient reaction with the molten iron, slag is formed and floats to the surface. This stirring desulfurization method is widely used both domestically and internationally due to its excellent kinetic conditions and desulfurization effect.

[0003] During KR mechanical stirring, the flow state of molten iron exhibits three typical characteristics: a central forced vortex zone, a free vortex zone, and a weak flow zone at the bottom of the ladle. Only in the free vortex zone, due to the cyclical motion causing relative movement between the desulfurizing agent and the molten iron, is the mixing and dispersion achieved, resulting in the best desulfurization reaction kinetics between lime and molten iron. The other two zones are less efficient, especially the central forced vortex zone. In this zone, the lack of relative movement between liquid micro-elements and the presence of negative pressure cause a large amount of lime to agglomerate during stirring, resulting in low desulfurizing agent utilization. The desulfurization efficiency in the weak flow zone at the bottom of the ladle is also relatively low. Therefore, shortening the upper central forced vortex zone and the lower weak flow zone, and expanding the size of the free vortex zone, are effective means to improve the mixing characteristics of KR stirring desulfurization and increase the utilization rate of the desulfurizing agent.

[0004] The current status of the KR stirring desulfurization process is as follows: 1. To ensure that the desulfurization powder added from the top of the molten iron ladle is fully mixed with the molten iron in the lower part of the ladle under the rotation of the KR stirring head, the stirring head must reach 100-140 r / m, with a high-speed stirring time of 12-15 minutes. This places high demands on the erosion and scouring resistance of the refractory material, resulting in a relatively short lifespan for the KR stirring head (200-300 cycles). 2. Due to design reasons, some steel plants have molten iron ladles with a high height-to-diameter ratio. If the stirring head is inserted too deeply or too shallowly, the mixing effect of the desulfurization agent with the molten iron in the upper forced vortex zone and the lower weak flow zone is poor, affecting the desulfurization effect and efficiency. Utility Model Content

[0005] The purpose of this invention is to provide a hot metal desulfurization stirring paddle that overcomes the shortcomings of traditional KR stirring heads. It adopts a double-layer stirring blade design and adds turbulence dams and turbulence wings to improve the turbulence effect and stirring intensity of hot metal, enhance desulfurization efficiency and effect, shorten the high-speed rotation time of the stirring head, and extend the service life of the stirring head.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A hot metal desulfurization stirring paddle includes a flange, a stirring shaft, and blades. The flange is fixed to one end of the stirring shaft, and the blades are fixed to the shaft body of the stirring shaft. Both the stirring shaft and the blades are composed of a metal inner core and a refractory outer lining. The blades are double-layered blades, with both layers of blades radially inclined to the stirring shaft, and the inclination directions of the two layers of blades are opposite. Multiple raised turbulence dams are provided on the stirring shaft above the upper blades, and turbulence vanes are provided at the upper end of the lower blades. The turbulence vanes are triangularly connected between the stirring shaft and the lower blades.

[0008] Anchor claws are fixed on the metal inner core.

[0009] The turbulence dam above the upper blade is set at an angle from top to bottom, and the downward tilting direction is the same as the tilting direction of the upper blade.

[0010] The thickness of the turbulence wing is 1 / 6 to 1 / 5 of the width of the lower blade.

[0011] Each layer of propeller blades has 3 to 4 blades.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. By changing the original single-layer agitator blade to a double-layer agitator blade structure, the height of the agitator blade can be shortened to 1 / 2-2 / 3 of the original. The distance between the two agitator blades can be adjusted appropriately according to the different height-to-diameter ratios of the molten iron ladle. This can shorten the upper forced vortex zone and the lower weak flow zone, expand the free vortex zone, and achieve the best desulfurization effect.

[0014] 2. The two agitator blades are designed with opposite radial angles, creating two layers of vortex zones with different intensities and speeds as the blades rotate within the molten iron ladle. This ensures thorough mixing and rapid reaction of the desulfurizing agent within the molten iron. The turbulence dam above the upper blade enhances stirring and creates turbulence in the upper layer of molten iron, while the lower turbulence blade acts as a transitional reinforcement between the two vortex zones, also contributing to turbulence between them. This ensures thorough stirring of the desulfurizing agent throughout the entire ladle, improving the turbulence and stirring intensity of the molten iron, enhancing desulfurization efficiency and effect, shortening the high-speed rotation time of the agitator head, and extending the service life of the agitator head. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] In the diagram: 1-flange, 2-stirring shaft, 3-turbulence dam, 4-upper blade, 5-turbulence vane, 6-lower blade. Detailed Implementation

[0017] The specific embodiments of this utility model are further described below:

[0018] like Figure 1 As shown: A hot metal desulfurization stirring paddle includes a flange 1, a stirring shaft 2, and blades. The flange 1 is fixed to one end of the stirring shaft 2, and the blades are fixed to the shaft body of the stirring shaft 2. Both the stirring shaft 2 and the blades are composed of a metal inner core and a refractory outer lining. The blades are double-layered blades, and both layers of blades are radially inclined to the stirring shaft 2, with opposite inclination directions. Multiple raised turbulence dams 3 are provided on the stirring shaft 2 above the upper blade 4, and turbulence wings 5 ​​are provided at the upper end of the lower blade 6. The turbulence wings 5 ​​are triangularly connected between the stirring shaft 2 and the lower blade 6.

[0019] The turbulence dam 3 above the upper blade 4 is obliquely arranged from top to bottom, and the downward tilting direction is the same as the tilting direction of the upper blade 4.

[0020] The thickness of the turbulent blade 5 is 1 / 6 to 1 / 5 of the width of the lower blade 6.

[0021] Anchor claws are fixed on the metal inner core.

[0022] Each layer of propeller blades has 3 to 4 blades.

[0023] Example 1:

[0024] A hot metal desulfurization stirring paddle includes a flange 1, a stirring shaft 2, and blades. The flange 1 is fixed to one end of the stirring shaft 2, and the blades are fixed to the shaft body of the stirring shaft 2. Both the stirring shaft 2 and the blades are composed of a metal inner core and a refractory outer lining. The blades are double-layered blades, and both layers of blades are radially inclined to the stirring shaft 2, with the inclination directions of the two layers of blades being opposite. Multiple raised turbulence dams 3 are provided on the stirring shaft 2 above the upper blade 4, and turbulence wings 5 ​​are provided at the upper end of the lower blade 6. The turbulence wings 5 ​​are triangularly connected between the stirring shaft 2 and the lower blade 6.

[0025] Each layer has four blades.

[0026] The turbulence dam 3 above the upper blade 4 is set at an angle from top to bottom, and the downward tilting direction is the same as the tilting direction of the upper blade 4.

[0027] The thickness of the turbulent airfoil 5 is 1 / 5 of the width of the lower blade 6.

[0028] The embodiment employs two stirring heads, achieving the goals of shortening the pretreatment time of molten iron and improving desulfurization efficiency. Its practicality is particularly prominent for molten iron ladles with high diameter-to-height ratios, ensuring thorough mixing without dead zones. At the same rotational speed, the desulfurizing agent stirring efficiency is increased by 50%–80%, and the stirring time is reduced from 12–15 minutes to 8–10 minutes, resulting in the following benefits:

[0029] 1. Shorten pretreatment time, speed up the turnover of molten iron ladles, and improve the production efficiency of steel plants.

[0030] 2. Reducing the temperature drop of molten iron during the pretreatment process increases the temperature of the molten iron entering the converter, resulting in greater economic benefits.

[0031] 3. Effectively extends the service life of the KR mixing head.

Claims

1. A molten iron desulphurization stirring paddle comprising a flange, a stirring shaft, a paddle blade, the flange being fixed at one end of the stirring shaft, the paddle blade being fixed on the shaft body of the stirring shaft, the stirring shaft and the paddle blade both being composed of a metal inner core and a refractory outer lining, characterized in that, The paddle is a double-layer paddle, the two layers of paddle are radially inclined to the stirring shaft, the inclined directions of the two layers of paddle are opposite, a plurality of protruding turbulence dams are arranged on the stirring shaft above the upper layer of paddle, and a turbulence wing is arranged on the upper end of the lower layer of paddle.

2. The molten iron desulphurization agitator according to claim 1, characterized in that, An anchor fluke is fixed on the metal inner core.

3. The molten iron desulphurization agitator according to claim 1, characterized in that, The turbulence dams above the upper layer of paddle are arranged in an inclined manner from top to bottom, and the inclined direction from top to bottom is the same as the inclined direction of the upper layer of paddle.

4. The molten iron desulphurization agitator according to claim 1, characterized in that, The thickness of the turbulence wing is 1 / 6-1 / 5 of the width of the lower layer of paddle.

5. The molten metal desulphurization impeller according to claim 1, characterized in that, Each layer of paddle is 3-4 pieces.

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