A slag powder separation device for stainless steel slag processing

Abstract

The utility model provides a slag powder separation device for stainless steel slag treatment, comprising a slag powder separation chamber, a coarse powder settling chamber, and a fine powder dust removal chamber connected in sequence by pipelines; the slag powder separation chamber comprises a separation chamber shell and a vibrating screen installed in the separation chamber shell; the bottom of the vibrating screen is open and receives a material collection bucket; an air inlet channel is provided at the bottom of the separation chamber shell, an exhaust port is provided at the top, and a negative pressure device is connected to the exhaust port at the top of the separation chamber shell to transport gas and dust to the coarse powder settling chamber; the gas output end of the fine powder dust removal chamber is connected to an air supply system, and the air inlet channel is connected to the output end of the air supply system. The utility model provides a slag powder separation device for stainless steel slag treatment, which can effectively separate and collect powder generated in the stainless steel slag treatment process, and reduce the influence of dust in the stainless steel slag on subsequent grinding and iron selection processes.

Description

Technical Field

[0001] The utility model relates to the technical field of slag treatment in metallurgical processes, in particular to a slag powder separation device for stainless steel slag treatment, and also to a slag powder separation device in the primary treatment and secondary treatment processes of stainless steel slag. Background Art

[0002] In the process of stainless steel smelting, it is necessary to control the content of elements such as C, S, and P to improve the physical and chemical properties of stainless steel. Therefore, it is necessary to add alkaline slag during the stainless steel blowing process to reduce the activity of SiO2 in the slag and increase the recovery rate of Cr. About 270 kg of slag is produced during the production of each ton of stainless steel. From the molten state to the cooling process, as the temperature decreases, the stainless steel slag will expand and produce powder, resulting in a large amount of dust during the production, transportation, and accumulation process, causing serious industrial pollution. Stainless steel slag treatment is an indispensable process in the production of stainless steel.

[0003] The stainless steel slag treatment process is usually divided into primary treatment and secondary treatment. The primary treatment is to cool the stainless steel slag from a high-temperature liquid state to 200 degrees Celsius or even below room temperature, and the secondary treatment is to select useful elements such as nickel and iron from the stainless steel slag and separate the slag powder when breaking the slag. In the prior art, the secondary treatment often uses a vibrating screen to sort the steel slag into different particle sizes. At this time, the stainless steel slag will carry the powder generated by the primary treatment expansion into the screening device, and the dust generated by the ore transfer and mutual collision during the vibration process will generate a large amount of dust to pollute the environment. At the same time, a large amount of dust will also adhere to the steel slag and enter the next link, affecting the efficiency of grinding and iron selection.

[0004] Based on this, it is necessary to propose a slag powder separation device for stainless steel slag processing to effectively separate and collect the dust of stainless steel slag to avoid dust emission. Utility Model Content

[0005] The utility model provides a slag powder separation device for stainless steel slag treatment, which can effectively separate and collect powder materials generated in the stainless steel slag treatment process, and reduce the influence of dust in the stainless steel slag on subsequent grinding and iron selection processes.

[0006] In order to achieve the above technical objectives and the above technical effects, the present invention solves the above problems through the following technical solutions:

[0007] A slag powder separation device for stainless steel slag processing, comprising a slag powder separation chamber, a coarse powder settling chamber, and a fine powder dust removal chamber which are connected in sequence through pipelines; the slag powder separation chamber comprises a separation chamber shell and a vibrating screen installed in the separation chamber shell; the bottom of the vibrating screen is open and receives a material collecting hopper, the feed channel is connected to the feed end of the vibrating screen, and the vibrating screen discharge end is equipped with a discharge channel to output the slag blocks; an air inlet channel is provided at the bottom of the separation chamber shell, and an exhaust port is provided at the top; a negative pressure device is provided between the slag powder separation chamber and the coarse powder settling chamber, and the negative pressure device is connected to the exhaust port on the top of the separation chamber shell to transport gas and dust to the coarse powder settling chamber; the gas output end of the fine powder dust removal chamber is connected to an air supply system, and the air inlet channel is connected to the output end of the air supply system.

[0008] In the above scheme, stainless steel slag enters the vibrating screen through the feed channel, and the slag of different particle sizes is separated as the vibrating screen vibrates. The air supply system cooperates with the negative pressure device to form a dust conveying airflow, which can suck the dust generated by the vibration upward to the coarse powder settling chamber. At the same time, the bottom of the vibrating screen is open and has a material collection bucket. The dust conveying airflow can enter the screen body and contact and carry out the dust generated by the vibration and impact of the slag and the dust attached to the slag of different particle sizes, so as to achieve a better slag-powder separation effect and reduce the impact of dust in the stainless steel slag on the subsequent grinding and iron selection processes.

[0009] Furthermore, the air supply system includes a fan chamber having an external air inlet connected to the atmosphere and a circulating air inlet connected to the gas output end of the fine powder removal chamber.

[0010] Furthermore, a mounting hole is provided at the bottom of the separation chamber shell to match the feed port at the top of the material collecting hopper, and the feed port at the top of the material collecting hopper is sealed and fixedly connected to the bottom of the separation chamber shell; the air inlet channel is connected to a gas blowing device, and the gas blowing device is located between the bottom of the vibrating screen and the material collecting hopper.

[0011] Furthermore, the gas blowing device includes a serpentine gas pipe installed on the top of the material collecting bucket, an upward nozzle is provided in the gap of the serpentine gas pipe, and a protective umbrella is arranged above the nozzle to prevent slag from falling into the nozzle; the bottom of the protective umbrella is a U-shaped arc surface that guides the gas to spray obliquely upward.

[0012] Furthermore, the coarse powder settling chamber is equipped with a multi-layer parallel inclined plate dust collector to settle the dust, and the fine powder dust collection chamber adopts a bag dust collection structure to settle the dust.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] 1. This scheme can realize the slag classification and dust removal at the same time, and use the vibration tumbling during screening to increase the contact opportunity between airflow and dust. It can effectively bring out the powder generated by the cooling and expansion of stainless steel slag, the dust generated by screening and impact, and the dust attached to slag of different particle sizes, so as to achieve a better slag-powder separation effect and reduce the impact of dust in stainless steel slag on subsequent grinding and iron selection processes.

[0015] 2. The gas conveying and return air system of the fine powder dust removal chamber in the scheme is conducive to forming a complete gas circulation system, reducing power loss while avoiding the discharge of residual dust in the dust removal exhaust gas to the outside. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural schematic diagram of a slag powder separation device for stainless steel slag processing according to the utility model;

[0017] Figure 2 for Figure 1 Structural schematic diagram of the medium slag powder separation chamber;

[0018] Figure 3 for Figure 2 A partial enlarged view of point A in the middle.

[0019] Figure number identification: 1, slag powder separation chamber, 11, separation chamber shell, 111, air inlet channel, 112, exhaust port, 12, vibrating screen, 13, material collection bucket, 14, feed channel, 15, discharge channel, 16, gas injection device, 161, serpentine gas transmission pipe, 162, nozzle, 163, protective umbrella;

[0020] 2. Coarse powder settling chamber, 3. Fine powder dust removal chamber, 4. Negative pressure device, 5. Air supply system, 51. External air inlet, 52. Circulating air inlet. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] The slag powder separation device for treating stainless steel slag described in this embodiment is as shown in the attached Figure 1 As shown, its main body includes an air supply system 5, a slag powder separation chamber 1, a negative pressure device 4, a coarse powder sedimentation chamber 2, and a fine powder dust removal chamber 3 which are connected in sequence.

[0023] As attached Figure 2 , 3As shown, the slag powder separation chamber 1 includes a separation chamber shell 11, a vibrating screen 12, a material collecting hopper 13, a feed channel 14, a discharge channel 15, and a gas blowing device 16. The driving motor of the vibrating screen 12 is installed on the outer wall of the separation chamber shell 11 through a motor seat, and its output end is connected to the vibrating screen body inside the separation chamber shell 11. The bottom of the vibrating screen 12 (i.e., the vibrating screen body) is open at the bottom, and the material collecting hopper 13 receives the fine slag falling from the bottom of the vibrating screen 12. The feed channel 14 connects the steel slag to be dusted to the feed end of the vibrating screen 12, and the discharge channel 15 is located at the discharge end of the vibrating screen 12 to output the slag blocks. In the embodiment, the vibrating screen 12 has two layers of screens, and the discharge ends correspond to the discharge channel 15 and the discharge channel 15' respectively.

[0024] The bottom of the separation chamber housing 11 is provided with an air inlet channel 111 connected to the output end of the air supply system 5. The air supply system 5 supplies air to the bottom of the slag powder separation chamber 1 through the air inlet channel 111. The air supply system 5 includes a fan chamber, which has an external air inlet 51 connected to the atmosphere and a circulating air inlet 52 connected to the gas output end of the fine powder removal chamber 3. Figure 1 An exhaust port 112 is arranged on the top of the separation chamber shell 11, and the exhaust port 112 is connected to the negative pressure device 4 to transport the gas and dust in the separation chamber shell 11 to the coarse powder settling chamber 2, and the negative pressure device 4 can be an air pump.

[0025] In the embodiment, a mounting hole is provided at the bottom of the separation chamber housing 11 to match the top feed opening of the material collection hopper 13. The separation chamber housing 11 is supported by a frame to the same height as the top feed opening of the material collection hopper 13 at the bottom, and the top feed opening of the material collection hopper 13 is sealed and fixedly connected to the bottom of the separation chamber housing 11. An inclined surface can be provided at the bottom of the separation chamber housing 11 to guide the slag to slide into the material collection hopper 13, and the fine-grained slag falling from the vibrating screen 12 can be better collected by the material collection hopper 13 and discharged from the discharge port at the bottom thereof.

[0026] Based on the fact that the bottom of the separation chamber shell 11 is opened at the same height as the feed port at the top of the material collection hopper 13, the air inlet channel 111 is connected to the gas blowing device 16 located between the bottom of the vibrating screen 12 and the material collection hopper 13. The gas blowing device 16 includes a serpentine gas pipe 161 installed on the top of the material collection hopper 13, and an upward nozzle 162 is opened in the gap of the serpentine gas pipe 161. A protective umbrella 163 is arranged above the nozzle 162 to prevent the slag from falling into the nozzle 162. The bottom of the protective umbrella 163 is a U-shaped arc surface that guides the gas to spray evenly obliquely upward, and the protective umbrella 163 is erected at the outlet of the nozzle 162 through a hollow bracket at the bottom. The above-mentioned gas blowing device 16 can make the gas input by the air supply system 5 evenly distributed, avoid the local concentration of gas, and cause the dust conveying airflow formed by the air supply system and the negative pressure device to be uneven, so as to ensure that the gas flows through the vibrating screen 12. The provision of the nozzle 162 can increase the gas flow rate and improve the dust separation efficiency in the stainless steel slag.

[0027] As attached Figure 1 As shown, the coarse powder settling chamber 2 has a built-in longitudinally arranged multi-layer parallel inclined plate dust collector to settle the dust, and the fine powder dust collection chamber 3 adopts a bag dust collection structure to settle the dust. The dust obtained at each level of dust collection can be uniformly collected and processed.

[0028] The stainless steel slag treatment slag powder separation device described in this embodiment is used to separate the stainless steel slag powder. The dust-removed steel slag enters the feed end of the vibrating screen 12 through the feed channel 15, and is screened into different particle sizes by the vibrating screen 12 and collected and output by the discharge channel 16 at the discharge end of the vibrating screen 12 or the material collection bucket 13 at the bottom of the vibrating screen 12. The dust conveying airflow formed by the air supply system 5 and the negative pressure device 6 takes the dust in the slag powder separation chamber 1 out and transports it to the coarse powder settling chamber 2 and the fine powder dust removal chamber 3 for dust removal. The dust conveying airflow can effectively carry out the powder generated by the cooling and expansion of the stainless steel slag, the dust generated by the screening and impact, and the dust attached to the slag materials of different particle sizes. The dust removal tail gas discharged from the fine powder dust removal chamber 3 returns to the circulating air inlet connected to the air supply system 5 to avoid residual dust in the dust removal tail gas from polluting the environment. The stainless steel slag treatment slag powder separation device described in this scheme can achieve a better slag powder separation effect, reducing the impact of dust in the stainless steel slag on the subsequent grinding and iron selection processes.

[0029] The above is a detailed description of the embodiments of the present invention in conjunction with the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments without departing from the principles and spirit of the present invention still fall within the scope of protection of the present invention.

Claims

1. A slag powder separation device for stainless steel slag treatment, characterized by: It comprises a slag powder separation chamber (1), a coarse powder settling chamber (2), and a fine powder dust removal chamber (3) which are sequentially connected via pipelines; The slag powder separation chamber (1) comprises a separation chamber shell (11) and a vibrating screen (12) installed in the separation chamber shell (11); the bottom of the vibrating screen (12) is open and receives a material collecting hopper (13); a feed channel (14) is connected to the feed end of the vibrating screen (12); and a discharge channel (15) is arranged at the discharge end of the vibrating screen (12) to discharge the slag blocks; An air inlet channel (111) is provided at the bottom of the separation chamber shell (11), and an exhaust port (112) is provided at the top; a negative pressure device (4) is provided between the slag powder separation chamber (1) and the coarse powder settling chamber (2), and the negative pressure device (4) is connected to the exhaust port (112) at the top of the separation chamber shell (11) to transport gas and dust to the coarse powder settling chamber (2); the gas output end of the fine powder removal chamber (3) is connected to the air supply system (5), and the air inlet channel (111) is connected to the output end of the air supply system (5).

2. The slag powder separation device for stainless steel slag treatment according to claim 1, characterized in that: The air supply system (5) comprises a fan chamber having an external air inlet (51) connected to the atmosphere, and a circulating air inlet (52) connected to the gas output end of the fine powder removal chamber (3).

3. The slag powder separation device for stainless steel slag treatment according to claim 1, characterized in that: The bottom of the separation chamber shell (11) is provided with a mounting hole that matches with the top feed opening of the material collection hopper (13), and the top feed opening of the material collection hopper (13) is sealed and fixedly connected to the bottom of the separation chamber shell (11); the air inlet channel (111) is connected with a gas blowing device (16), and the gas blowing device (16) is located between the bottom of the vibrating screen (12) and the material collection hopper (13).

4. The slag powder separation device for stainless steel slag treatment according to claim 3, characterized in that: The gas blowing device (16) comprises a serpentine gas pipe (161) installed on the top of the material collecting bucket (13), an upward nozzle (162) is provided in the gap of the serpentine gas pipe (161), a protective umbrella (163) is arranged above the nozzle (162) to prevent slag from falling into the nozzle (162), and the bottom of the protective umbrella (163) is a U-shaped arc surface for guiding the gas to be uniformly sprayed obliquely upward.

5. The slag powder separation device for stainless steel slag treatment according to claim 1, characterized in that: The coarse powder settling chamber (2) is equipped with a multi-layer parallel inclined plate dust collector to settle the dust, and the fine powder dust collection chamber (3) adopts a bag dust collection structure to settle the dust.

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