Steel slag treatment process adopting water-gas mixed composite air quenching

Abstract

The invention discloses a steel slag treatment process adopting water-gas mixed composite air quenching, which comprises a cooling chamber, a slag tank arranged at an inlet of the cooling chamber and used for pouring liquid steel slag, a steel slag chute arranged below the slag tank, a high-pressure tuyere arranged below the steel slag chute, a water mist nozzle arranged below the high-pressure tuyere, and the bottom of the cooling chamber in a conical shape. A discharge port is formed in the bottom, a flue gas exhaust port is formed in the top, and a steel slag raising mechanism is fixedly mounted at the discharge port. According to the steel slag treatment process adopting water-gas mixing and composite air quenching, the cooling speed of the steel slag can be increased, continuous slag discharging is achieved, the water content in the steel slag is low, transportation is convenient, and in the production process of the steel slag, the needed working site is small, and the production cost and requirements are low.

Description

Technical Field

[0001] The invention relates to the technical field of steel slag treatment, in particular to a steel slag treatment process using water-gas mixed composite wind quenching. Background Art

[0002] The existing wind quenching methods include wet wind quenching and dry wind quenching. The wet wind quenching uses water to cool the granulated droplets to form slag particles; the dry wind quenching uses cold air to cool the granulated droplets to form slag particles. Among them, the wet wind quenching uses a special cooling water pool for cooling, the steel slag particles cool quickly, can be processed continuously, have strong processing capacity, and the slag particles can be automatically collected. However, there are some adverse effects on storage and transportation due to the need for investment, large site, and high water content of the slag particles after treatment. Dry wind quenching has a slow cooling speed because the dispersed slag particles need to be scattered on the ground of the wind quenching chamber for cooling. At the same time, the slag particles need to be collected and cannot be operated continuously. At least two sets of powder quenching equipment (chambers) need to be used alternately to meet the operating rhythm requirements of the steel plant slag treatment, and the investment cost is high. For some small and medium-sized steel plants, due to the small slag processing volume, the investment requirements and site requirements of these two methods are relatively high.

[0003] The present invention combines the advantages of the two existing wind quenching methods, can reduce the operating area requirements, automatically collect the processed slag particles, can meet the needs of processing steel slag with a relatively small output, and is relatively economical in investment. Summary of the invention

[0004] The object of the present invention is to provide a steel slag treatment process using a water-gas mixed composite air quenching to solve the problems of the large area required for the existing air quenching work site and low production efficiency mentioned in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a steel slag treatment process using water-gas mixed composite wind quenching, comprising a cooling chamber, a slag pot for pouring liquid steel slag is provided at the entrance of the cooling chamber, a steel slag chute is provided below the slag pot, a high-pressure air port is provided below the steel slag chute, a water mist nozzle is provided below the high-pressure air port, the bottom of the cooling chamber is provided in a conical shape, a discharge port is provided at the bottom, a smoke discharge port is provided at the top, a steel slag lifting mechanism is fixedly installed at the discharge port, and a material collection belt conveyor is provided below the discharge port; The slag lifting mechanism includes a lifting plate, an inner cylinder is fixed at the bottom of the lifting plate, the inner cylinder is slidably inserted in the outer cylinder up and down, a pin is arranged in the inner cylinder, a flange is fixed at the bottom of the outer cylinder, a motor is arranged at the bottom of the flange, the motor driving end passes through the flange and fixes the turntable, a spiral arc piece is arranged on the side wall of the turntable, the turntable is inserted into the inner cylinder and the pin is pressed against the lower end surface of the arc piece, a spring is arranged between the inner cylinder and the flange, the spring sleeve is arranged outside the turntable and the arc piece, the lifting plate penetrates 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 slag can flow into the discharge port from the side of the lifting plate and be discharged from the discharge port.

[0006] Preferably, a slide groove is provided on the inner wall of the outer cylinder, and the outer end of the pin penetrates through the side wall of the inner cylinder and is slidably inserted in the slide groove.

[0007] Preferably, the flange is composed of an inner ring and an outer ring, a plurality of annularly evenly 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 fixed to the outer cylinder by screws inserted into the inner mounting holes, and a plurality of outer mounting holes for fixing to the bottom of the discharge port are arranged on the outer ring.

[0008] Preferably, the conical side wall of the cooling chamber is provided with a plurality of cold air blowing holes evenly distributed in an annular shape, and the cold air blowing holes are located above the lifting plate, and the air outlets of the cold air blowing holes are arranged upward.

[0009] Preferably, a heat insulating gasket is provided between the flange and the motor.

[0010] Preferably, the high-pressure air outlet is connected to the high-pressure air duct, the water mist nozzle is connected to the atomization duct, and flow regulating valves are provided on the high-pressure air outlet and the water mist nozzle.

[0011] Compared with the prior art, the present invention has the following beneficial effects: The steel slag treatment process of the present invention adopts water-gas mixed composite wind quenching, which can improve the cooling speed of the steel slag and realize continuous slag discharge. The steel slag has low moisture content and is easy to transport. The steel slag requires a small working space during the production process, and the production cost and requirements are low. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is the external structure diagram of the whole invention; Figure 2 for Figure 1 Internal structure diagram; Figure 3 It is a structural schematic diagram of the slag lifting mechanism in the present invention; Figure 4 for Figure 3 The local structure diagram of Figure 5 This is the assembly drawing of the inner cylinder and the outer cylinder.

[0013] In the figure: 1. cooling chamber; 2. slag tank; 3. slag chute; 4. high-pressure air outlet; 5. water mist nozzle; 6. cold air purge hole; 7. slag lifting mechanism; 70. discharge slot; 71. lifting plate; 72. inner cylinder; 73. pin; 74. outer cylinder; 75. flange; 76. motor; 77. spring; 78. turntable; 79. arc sheet; 8. material collection belt conveyor; 9. smoke exhaust outlet; 10. inner mounting hole; 11. outer mounting hole; 12. chute; 13. discharge outlet. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] See also Figure 1-5 A steel slag treatment process using water-gas mixed composite wind quenching includes a cooling chamber 1, a slag pot 2 for pouring liquid steel slag is arranged at the inlet of the cooling chamber 1, a steel slag chute 3 is arranged below the slag pot 2, a high-pressure air port 4 is arranged below the steel slag chute 3, and a water mist nozzle 5 is arranged below the high-pressure air port 4. High-temperature liquid steel slag is poured into the slag pot 2, and the slag pot 2 is turned over by a tilting device. The liquid steel slag passes through the steel slag chute 3, and the outlet of the steel slag chute 3 is arranged above the high-pressure air port 4. The high-speed airflow forms a strong impact on the falling steel slag flow, so that the liquid The slag is crushed, granulated and cooled. The cooling water mist sprayed from the water mist nozzle 5 can further increase the cooling speed of the slag, so as to realize the continuous treatment of the slag. The bottom of the cooling chamber 1 is conical, and a discharge port 13 is arranged at the bottom, and a smoke discharge port 9 is arranged at the top. A slag lifting mechanism 7 is fixedly installed at the discharge port 13; the slag lifting mechanism 7 lifts the piled slag, and the lifted slag contacts the cold air and cold mist in the slag tank 2, so as to increase the cooling speed of the slag. A material collecting belt conveyor 8 is arranged below the discharge port 13. The specific structure of the slag lifting mechanism 7 is as follows: the slag lifting mechanism 7 includes a lifting plate 71, an inner cylinder 72 is fixed at the bottom of the lifting plate 71, the inner cylinder 72 is slidably inserted in the outer cylinder 74, a pin 73 is arranged in the inner cylinder 72, a flange 75 is fixed at the bottom of the outer cylinder 74, a motor 76 is arranged at the bottom of the flange 75, a driving end of the motor 76 passes through the flange 75 and fixes a turntable 78, a spiral arc piece 79 is arranged on the side wall of the turntable 78, the turntable 78 is inserted into the inner cylinder 72 and makes the pin 73 abut against the lower end surface of the arc piece 79, a spring 77 is arranged between the inner cylinder 72 and the flange 75, and the spring 77 is sleeved outside the turntable 78 and the arc piece 79, the lifting plate 71 penetrates into the discharge port 13, the outer diameter of the lifting plate 71 is larger than the diameter of the discharge port 13, when the lifting plate 71 is at the highest point, the slag can flow into the discharge port 13 from the side of the lifting plate 71 and be discharged from the discharge port 13. The motor 76 runs and drives the turntable 78 to rotate. The arc-shaped piece 79 on the turntable 78 pushes the inner cylinder 72 to move downward and compresses the spring 77. When the turntable 78 rotates to a certain angle, the pin 73 on the inner cylinder 72 moves out from under the arc-shaped piece 79, and the spring 77 connects the inner cylinder 72 to the lifting plate 71 and bounces it up. The slag on the lifting plate 71 is also bounced up together. Then the turntable 78 continues to rotate, and the pin 73 is located under the arc-shaped piece 79 again. The above movement is repeated. In this process, the slag falling on the lifting plate 71 is continuously lifted up and cooled, which speeds up the cooling speed.

[0016] A slide groove 12 is formed on the inner wall of the outer cylinder 74 , and the outer end of the pin 73 penetrates through the side wall of the inner cylinder 72 and is slidably inserted into the slide groove 12 .

[0017] The flange 75 consists of an inner ring and an outer ring, and a plurality of annular evenly distributed discharge slots 70 are arranged between the inner ring and the outer ring. The inner ring is provided with a plurality of inner mounting holes 10 and is fixed to the outer cylinder 74 by inserting screws into the inner mounting holes 10. The outer ring is provided with a plurality of outer mounting holes 11 for fixing to the bottom of the discharge port 13. The discharge port 13 is used to discharge the cooled slag to the material collecting belt conveyor 8 below.

[0018] The conical side wall of the cooling chamber 1 is provided with a plurality of cold air blowing holes 6 evenly distributed in an annular shape, and the cold air blowing holes 6 are located above the lifting plate 71, and the air outlet of the cold air blowing holes 6 is arranged upward. The cold air blowing 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 on the lifting plate 71, and is lifted by the lifting plate 71 for secondary cooling, thereby improving the cooling effect of the steel slag.

[0019] A heat insulating gasket is provided between the flange 75 and the motor 76 to reduce the heat transferred to the motor 76 , thereby protecting the motor 76 and preventing the motor 76 from being burned due to overheating.

[0020] The high-pressure air port 4 is connected to the high-pressure air duct, the water mist nozzle 5 is connected to the atomization pipeline, and the high-pressure air port 4 and the water mist nozzle 5 are provided with flow regulating valves. Controlling the amount of water mist can control the final cooling temperature of the slag particles and avoid water accumulation in the slag particles.

Claims

1. A steel slag treatment process using water-gas mixed composite wind quenching, comprising a cooling chamber (1), a slag pot (2) for pouring liquid steel slag is provided at the inlet of the cooling chamber (1), a steel slag chute (3) is provided below the slag pot (2), and a high-pressure air outlet (4) is provided below the steel slag chute (3), characterized in that: A water mist nozzle (5) is arranged below the high-pressure air port (4); the bottom of the cooling chamber (1) is arranged in a conical shape, and a discharge port (13) is arranged at the bottom, and a smoke discharge port (9) is arranged at the top; a slag lifting mechanism (7) is fixedly installed at the discharge port (13); and a material collection belt conveyor (8) is arranged below the discharge port (13); The slag lifting mechanism (7) comprises a lifting plate (71), an inner cylinder (72) is fixed at the bottom of the lifting plate (71), the inner cylinder (72) is slidably inserted in an outer cylinder (74) in an up-and-down manner, a pin (73) is arranged in the inner cylinder (72), a flange (75) is fixed at the bottom of the outer cylinder (74), a motor (76) is arranged at the bottom of the flange (75), a driving end of the motor (76) passes through the flange (75) and fixes a turntable (78), a spiral arc sheet (79) is arranged on the side wall of the turntable (78), and the turntable (78) is provided with a spiral arc sheet (79). The inner cylinder (72) is inserted into the inner cylinder (78) so that the pin (73) abuts against the lower end surface of the arc-shaped sheet (79). A spring (77) is arranged between the inner cylinder (72) and the flange (75). The spring (77) is sleeved outside the turntable (78) and the arc-shaped sheet (79). The lifting plate (71) penetrates into the discharge port. The outer diameter of the lifting plate (71) is larger than the diameter of the discharge port (13). When the lifting plate (71) is at the highest point, the slag can flow into the discharge port from the side of the lifting plate (71) and be discharged from the discharge port (13).

2. The steel slag treatment process using water-gas mixed composite wind quenching according to claim 1 is characterized in that: The inner wall of the outer cylinder (74) is provided with a slide groove (12), and the outer end of the pin (73) penetrates the side wall of the inner cylinder (72) and is slidably inserted into the slide groove (12).

3. The steel slag treatment process using water-gas mixed composite wind quenching according to claim 1, characterized in that: The flange (75) is composed of an inner ring and an outer ring, and a plurality of annular evenly distributed discharge slots (70) are arranged between the inner ring and the outer ring. The inner ring is provided with a plurality of inner mounting holes (10) and is fixed to the outer cylinder (74) by screws inserted into the inner mounting holes (10). The outer ring is provided with a plurality of outer mounting holes (11) for fixing to the bottom of the discharge port (13).

4. The steel slag treatment process using water-gas mixed composite wind quenching according to claim 1, characterized in that: The conical side wall of the cooling chamber (1) is provided with a plurality of cold air blowing holes (6) evenly distributed in an annular shape, and the cold air blowing holes (6) are located above the lifting plate (71), and the air outlets of the cold air blowing holes (6) are arranged to face upwards.

5. The steel slag treatment process using water-gas mixed composite wind quenching according to claim 1, characterized in that: A heat insulating gasket is provided between the flange (75) and the motor (76).

6. The steel slag treatment process using water-gas mixed composite wind quenching according to claim 1, characterized in that: The high-pressure air port (4) is connected to the high-pressure air duct, the water mist nozzle (5) is connected to the atomization duct, and the high-pressure air port (4) and the water mist nozzle (5) are provided with flow regulating valves.

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