A steel slag treatment process using a combined air quenching with water-vapor mixing

Abstract

The present invention discloses a steel slag treatment process using a composite air quenching with water-vapor mixing, which includes a cooling chamber. A slag ladle for pouring liquid steel slag is provided at the inlet of the cooling chamber. A steel slag chute is arranged below the slag ladle, a high-pressure air nozzle is arranged below the steel slag chute, a water mist nozzle is arranged below the high-pressure air nozzle. The bottom of the cooling chamber is conically arranged, and a discharge port is arranged at the bottom, and a flue gas discharge port is arranged at the top. A steel slag lifting mechanism is fixedly installed at the discharge port. This steel slag treatment process using a composite air quenching with water-vapor mixing can improve the cooling rate of steel slag, realize continuous slag discharging, and the water content in the steel slag is low, which is convenient for transportation. The working site required for the steel slag during the production process is small, and the production cost and requirements are low.

Description

Technical Field

[0001] The present invention relates to the technical field of steel slag treatment, and specifically to a steel slag treatment process using combined air quenching with a mixture of water and gas. Background Art

[0002] Existing air quenching methods include wet air quenching and dry air quenching. In wet air quenching, water is used to cool the granulated droplets to form slag particles; in dry air quenching, cold air is used to cool the granulated droplets to form slag particles. Among them, in wet air quenching, since a special cooling water pool is used for cooling, the cooling rate of steel slag particles is fast, continuous treatment can be carried out, the treatment capacity is strong, and the slag particles can be automatically collected. However, there are disadvantages such as large investment and large site requirements, and the water content of the treated slag particles is relatively high, which has some adverse effects on storage and transportation. In dry air quenching, since the dispersed slag particles need to fall on the ground of the air quenching chamber for cooling, the cooling rate is slow. At the same time, collection operations need to be carried out on the slag particles, and continuous operation cannot be achieved. At least two sets of powder quenching equipment (chambers) need to be used alternately to meet the operation rhythm requirements of steel plant slag treatment, and the investment cost is high. For some small and medium-sized steel plants, due to the small amount of slag treatment, the investment requirements and site requirements of these two methods are relatively high.

[0003] The present invention combines the advantages of the original two air quenching methods, can reduce the required operation area, automatically collect the treated slag particles, can meet the steel slag treatment with a small output, and the investment is also relatively economical. Summary of the Invention

[0004] The purpose of the present invention is to provide a steel slag treatment process using combined air quenching with a mixture of water and gas to solve the problems of large operation site area required and low production efficiency in the existing air quenching methods mentioned in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A steel slag treatment process using combined air quenching with a mixture of water and gas, including a cooling chamber. There is a slag pot for pouring liquid steel slag at the entrance of the cooling chamber. A steel slag chute is arranged below the slag pot. A high-pressure air outlet is arranged below the steel slag chute. A water mist nozzle is arranged below the high-pressure air outlet. The bottom of the cooling chamber is conical and a discharge port is arranged at the bottom, and a flue gas discharge port is arranged at the top. A steel slag lifting mechanism is fixedly installed at the discharge port. A material collection belt conveyor is arranged below the discharge port;

[0006] The steel slag lifting mechanism includes a lifting plate. The inner cylinder is fixed to the bottom of the lifting plate. The inner cylinder is slidably inserted into the outer cylinder in an up-and-down manner. A pin column is arranged inside the inner cylinder. A flange is fixed to the bottom of the outer cylinder. A motor is arranged at the bottom of the flange. The driving end of the motor penetrates through the flange and is fixed to a turntable. A spiral arc-shaped piece is arranged on the side wall of the turntable. The turntable is inserted into the inner cylinder and the pin column abuts against the lower end face of the arc-shaped piece. A spring is arranged between the inner cylinder and the flange, and the spring is sleeved outside the turntable and the arc-shaped piece. The lifting plate extends deep into the discharge port. The outer diameter of the lifting plate is larger than the diameter of the discharge port. When the lifting plate is at the highest point, the steel slag can flow into the discharge port from the side of the lifting plate and be discharged from the discharge port.

[0007] Preferably, a chute is opened on the inner wall of the outer cylinder. The outer end of the pin column penetrates through the side wall of the inner cylinder and is slidably inserted into the chute.

[0008] Preferably, the flange consists of an inner ring and an outer ring. A plurality of annularly distributed discharge slots are arranged between the inner ring and the outer ring. A plurality of inner mounting holes are arranged on the inner ring and are fixed to the outer cylinder by inserting screws into the inner mounting holes. A plurality of outer mounting holes for fixing to the bottom of the discharge port are arranged on the outer ring.

[0009] Preferably, a plurality of annularly distributed cold air purge holes are arranged on the conical side wall of the cooling chamber, and the cold air purge holes are located above the lifting plate. The air outlet of the cold air purge holes is arranged upward.

[0010] Preferably, a heat insulation washer is arranged between the flange and the motor.

[0011] Preferably, the high-pressure air outlet is connected to a high-pressure air duct, the water mist nozzle is connected to an atomizing pipeline, and flow regulating valves are arranged on the high-pressure air outlet and the water mist nozzle.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0013] The steel slag treatment process using composite air quenching with water and gas mixture of the present invention can improve the cooling speed of steel slag, realize continuous slag discharge, and the water content in the steel slag is low, which is convenient for transportation. The working site required for the steel slag in the production process is small, and the production cost and requirements are low. Description of the Drawings

[0014] Figure 1 is the external structure diagram of the whole of the present invention;

[0015] Figure 2 is Figure 1 the internal structure diagram;

[0016] Figure 3 is the structural schematic diagram of the steel slag lifting mechanism in the present invention;

[0017] Figure 4 is Figure 3 the partial structure diagram;

[0018] Figure 5 It is an assembly drawing of the inner cylinder and the outer cylinder.

[0019] In the figure: 1. Cooling chamber; 2. Slag pot; 3. Steel slag chute; 4. High-pressure air nozzle; 5. Water mist nozzle; 6. Cold air purge hole; 7. Steel slag lifting mechanism; 70. Discharge chute opening; 71. Lifting disc; 72. Inner cylinder; 73. Pin column; 74. Outer cylinder; 75. Flange; 76. Motor; 77. Spring; 78. Turntable; 79. Arc-shaped piece; 8. Material collection belt conveyor; 9. Flue gas discharge port; 10. Inner mounting hole; 11. Outer mounting hole; 12. Slide groove; 13. Discharge port. Specific embodiments

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] Please refer to Figures 1-5 , a steel slag treatment process using a composite air quenching with a mixture of water and gas, including a cooling chamber 1. A slag pot 2 for pouring liquid steel slag is provided at the entrance of the cooling chamber 1. A steel slag chute 3 is arranged below the slag pot 2. A high-pressure air nozzle 4 is arranged below the steel slag chute 3. A water mist nozzle 5 is arranged below the high-pressure air nozzle 4. High-temperature liquid steel slag is poured into the slag pot 2. The slag pot 2 is flipped through a tipping device. The liquid steel slag passes through the steel slag chute 3. The outlet of the steel slag chute 3 is arranged above the high-pressure air nozzle 4. The high-speed air flow forms a strong impact on the falling steel slag flow, causing the liquid steel slag to be broken and granulated and cooled. The water mist nozzle 5 sprays cooling water mist, which can further improve the cooling speed of the steel slag and realize the continuous treatment of the steel slag. The bottom of the cooling chamber 1 is conical and a discharge port 13 is arranged at the bottom, and a flue gas discharge port 9 is arranged at the top. A steel slag lifting mechanism 7 is fixedly installed at the discharge port 13; the steel slag lifting mechanism 7 lifts the piled-up steel slag, and the lifted steel slag contacts the cold air and cold mist in the slag pot 2, which can increase the cooling speed of the steel slag. A material collection belt conveyor 8 is arranged below the discharge port 13.

[0022] The specific structure of the steel slag lifting mechanism 7 is as follows: The steel slag lifting mechanism 7 includes a lifting disc 71. The bottom of the lifting disc 71 is fixed with an inner cylinder 72. The inner cylinder 72 is slidably inserted into the outer cylinder 74 in an up-and-down manner. A pin column 73 is arranged inside the inner cylinder 72. The bottom of the outer cylinder 74 is fixed with a flange plate 75. A motor 76 is arranged at the bottom of the flange plate 75. The driving end of the motor 76 penetrates through the flange plate 75 and is fixed with a turntable 78. A spiral arc-shaped piece 79 is arranged on the side wall of the turntable 78. The turntable 78 is inserted into the inner cylinder 72 and the pin column 73 abuts against the lower end surface of the arc-shaped piece 79. A spring 77 is arranged between the inner cylinder 72 and the flange plate 75. The spring 77 is sleeved outside the turntable 78 and the arc-shaped piece 79. The lifting disc 71 extends into the inside of the discharge port 13. The outer diameter of the lifting disc 71 is larger than the diameter of the discharge port 13. When the lifting disc 71 is at the highest point, the steel slag can flow into the discharge port 13 from the side of the lifting disc 71 and be discharged from the discharge port 13. When the motor 76 operates and drives the turntable 78 to rotate, the arc-shaped piece 79 on the turntable 78 pushes the inner cylinder 72 downward and compresses the spring 77. When the turntable 78 rotates to a certain angle, the pin column 73 on the inner cylinder 72 moves out from below the arc-shaped piece 79. The spring 77 bounces up the inner cylinder 72 together with the lifting disc 71, and the steel slag on the lifting disc 71 is also bounced up together. Then the turntable 78 continues to rotate, and the pin column 73 is located below the arc-shaped piece 79 again, repeating the above movement. In this process, the steel slag falling on the lifting disc 71 is continuously lifted and cooled, accelerating the cooling speed.

[0023] A chute 12 is opened on the inner wall of the outer cylinder 74. The outer end of the pin column 73 penetrates through the side wall of the inner cylinder 72 and is slidably inserted into the chute 12.

[0024] The flange plate 75 is composed of an inner ring and an outer ring. A plurality of annularly distributed discharge chute openings 70 are arranged between the inner ring and the outer ring. A plurality of inner mounting holes 10 are arranged on the inner ring and are fixed to the outer cylinder 74 by inserting screws into the inner mounting holes 10. A plurality of outer mounting holes 11 for fixing to the bottom of the discharge port 13 are arranged on the outer ring. The discharge port 13 is used to discharge the cooled steel slag onto the lower material collecting belt conveyor 8.

[0025] A plurality of annularly distributed cold air purge holes 6 are arranged on the conical side wall of the cooling chamber 1, and the cold air purge holes 6 are located above the lifting disc 71. The air outlet of the cold air purge holes 6 is arranged upward. The cold air purge holes 6 on the four walls of the conical hopper extend the air time of the slag particles and concentrate the slag particles in the middle of the hopper, so that most of the steel slag falls onto the lifting disc 71, and after being lifted by the lifting disc 71 for secondary cooling, the cooling effect of the steel slag is improved.

[0026] A heat insulation washer is arranged between the flange plate 75 and the motor 76, which can reduce the heat transferred to the motor 76, thereby protecting the motor 76 and preventing it from being overheated and burned out.

[0027] The high-pressure air outlet 4 is connected to the high-pressure air duct, and the water mist nozzle 5 is connected to the atomization pipeline. Flow regulating valves are provided at the high-pressure air outlet 4 and the water mist nozzle 5. Controlling the amount of water mist can control the final cooling temperature of the slag particles and avoid water accumulation on the slag particles at the same time.

Claims

1. A steel slag treatment process using combined air quenching with water-vapor mixing, comprising a cooling chamber (1), a slag ladle (2) for pouring liquid steel slag is provided at the inlet of the cooling chamber (1), a steel slag chute (3) is arranged below the slag ladle (2), and a high-pressure air nozzle (4) is arranged below the steel slag chute (3), characterized in that: A water mist nozzle (5) is arranged below the high-pressure air inlet (4). The bottom of the cooling chamber (1) is conically arranged, and a discharge port (13) is arranged at the bottom, and a flue gas discharge port (9) is arranged at the top. A steel slag lifting mechanism (7) is fixedly installed at the discharge port (13), and a material collecting belt conveyor (8) is arranged below the discharge port (13). The steel slag lifting mechanism (7) includes a lifting disc (71). An inner cylinder (72) is fixedly arranged at the bottom of the lifting disc (71). The inner cylinder (72) is slidably inserted into the outer cylinder (74) in an up-and-down manner. A pin column (73) is arranged inside the inner cylinder (72). A flange plate (75) is fixedly arranged at the bottom of the outer cylinder (74). A motor (76) is arranged at the bottom of the flange plate (75). The driving end of the motor (76) penetrates through the flange plate (75) and is fixedly connected with a turntable (78). A spiral arc-shaped piece (79) is arranged on the side wall of the turntable (78). The turntable (78) is inserted into the inner cylinder (72) and the pin column (73) abuts against the lower end surface of the arc-shaped piece (79). A spring (77) is arranged between the inner cylinder (72) and the flange plate (75). The spring (77) is sleeved outside the turntable (78) and the arc-shaped piece (79). The lifting disc (71) extends deep into the discharge port. The outer diameter of the lifting disc (71) is larger than the diameter of the discharge port (13). When the lifting disc (71) is at the highest point, the steel slag can flow into the discharge port from the side of the lifting disc (71) and be discharged from the discharge port (13).

2. The steel slag treatment process using combined air quenching with water-vapor mixing according to claim 1, wherein: A chute (12) is formed in the inner wall of the outer cylinder (74). The outer end of the pin column (73) penetrates through the side wall of the inner cylinder (72) and is slidably inserted into the chute (12).

3. A steel slag treatment process using combined air and water quenching with a water-gas mixture according to claim 1, characterized in that: The flange plate (75) is composed of an inner ring and an outer ring. A plurality of annularly distributed discharge chute openings (70) are arranged between the inner ring and the outer ring. A plurality of inner mounting holes (10) are arranged on the inner ring, and the outer cylinder (74) is fixed by inserting screws into the inner mounting holes (10). A plurality of outer mounting holes (11) for fixing with the bottom of the discharge port (13) are arranged on the outer ring.

4. A steel slag treatment process using a composite air quenching with water-vapor mixing according to claim 1, characterized in that: A plurality of annularly distributed cold air purge holes (6) are arranged on the conical side wall of the cooling chamber (1), and the cold air purge holes (6) are located above the lifting disc (71). The air outlet of the cold air purge holes (6) is arranged upward.

5. A steel slag treatment process using combined air and water quenching with a water-vapor mixture according to claim 1, characterized in that: A heat insulation gasket is arranged between the flange plate (75) and the motor (76).

6. The steel slag treatment process using combined air and water quenching with gas-water mixing according to claim 1, characterized in that: The high-pressure air inlet (4) is connected to a high-pressure air duct, the water mist nozzle (5) is connected to an atomization pipeline, and flow regulating valves are arranged for the high-pressure air inlet (4) and the water mist nozzle (5).

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