Stainless steel slag treatment system

Abstract

The utility model relates to the technical field of steel slag recovery treatment, and provides a stainless steel slag treatment system which comprises a powder selecting and generating device, a granule collecting device and a powder collecting device. The powder selecting and generating device comprises a raw material slag disc, a shell, a high-pressure air filling device, a block material disc, a material distributing hopper and a first discharging channel. A closed cavity is formed in the shell; the raw material slag tray is positioned in the closed cavity; the high-pressure air filling device communicates with the closed cavity and is used for filling high-pressure air into the closed cavity to suspend the fine powder. Fine powder is classified into different particle sizes to be collected, large-scale industrial utilization is achieved, and dust raising can be effectively avoided while the fine powder is collected.

Description

Technical Field

[0001] The utility model belongs to the technical field of steel slag recovery and treatment, and in particular relates to a stainless steel slag treatment system. Background Art

[0002] Stainless steel slag is waste generated during the smelting of stainless steel. At present, there is no effective method for stainless steel enterprises to recycle stainless steel slag. Most stainless steel slag adopts the "slag natural cooling + slag tipping + ball mill water selection" disposal process. After the valuable metals are completely selected, the tailings discharged have a high water content (generally around 20%). Due to the high water content of the tailings, the resource utilization of the tailings is limited. The tailings can generally only be piled up in disorder in the slag yard or landfill, and a small part is used for cement and slag powder.

[0003] From the perspective of mineral composition, the main mineral components of stainless steel slag are dicalcium silicate, tricalcium silicate and solid solution phase, so stainless steel slag has certain gelling properties, and it has great potential to be used as a mineral admixture in the construction field such as building materials. When stainless steel slag is used as a gelling material, in order to improve its gelling activity, the tail needs to be dried, crushed, and finely ground to achieve a certain particle size (generally less than 200 mesh). The current high-energy consumption ball mill needs a long time to grind to achieve the particle size requirements, and the ball milling process has high energy consumption, which affects the economic benefits of its practical application.

[0004] If the dust problem during the cooling process of stainless steel slag can be solved, and the cooling pulverization phenomenon can be utilized to collect the fine powder during the cooling process of the slag, the utilization rate of stainless steel slag can be greatly improved, and large-scale industrial utilization can be achieved. However, there is currently no relevant system or equipment to avoid dust while collecting the fine powder during the cooling process of stainless steel slag. Utility Model Content

[0005] In response to the above-mentioned problems in the prior art, the present application proposes a stainless steel slag processing system, which achieves the suspension of stainless steel slag fine powder by introducing high-pressure air into a closed container, and effectively avoids dust while collecting the fine powder. The selected dry powder has a fineness of more than 200 meshes. The fine powder can be widely used in the building materials industry and other fields to realize the resource utilization of stainless steel slag.

[0006] The utility model proposes a stainless steel slag processing system, comprising a powder selection generating device, a granular material collecting device and a powder collecting device; the powder selection generating device comprises: a raw material slag pan, an outer shell, a high-pressure air injection device, a block material pan, a dividing hopper and a first discharging channel; a closed cavity is formed inside the outer shell; the raw material slag pan is located in the closed cavity; the high-pressure air injection device is connected to the closed cavity, and is used to inject high-pressure air into the closed cavity to suspend fine powder; the block material pan is located below the raw material slag pan, and the dividing hopper is connected between the block material pan and the raw material slag pan; the first discharging channel is located above the outer shell, and the first discharging channel is connected between the outer shell and the granular material collecting device; a granular material pan is provided at the lower end of the granular material collecting device; a second discharging channel is connected between the granular material collecting device and the powder collecting device; a powder material pan is provided at the lower end of the powder collecting device.

[0007] Furthermore, the high-pressure air injection device includes an upper blowing gun and a lower blowing gun; the upper blowing gun is located above the raw material slag pan, and the lower blowing gun is located below the raw material slag pan.

[0008] Furthermore, the upper blowing gun forms a first angle with the horizontal plane, and is tilted toward the top of the raw material slag pan; the lower blowing gun forms a second angle with the horizontal plane, and is tilted toward the bottom of the raw material slag pan; the first angle is greater than or equal to the second angle.

[0009] Furthermore, there are multiple upper blowing guns.

[0010] Furthermore, a movable cover is sealed and connected to the upper part of the shell; and the movable cover is communicated with the first discharge channel.

[0011] Furthermore, the upper blowing gun penetrates the movable cover and points toward the raw material slag pan.

[0012] Furthermore, a sealing valve is provided at the lower end of the distribution hopper, and an electro-hydraulic push rod is connected to one side of the distribution hopper; the electro-hydraulic push rod is connected to the sealing valve.

[0013] Furthermore, the lower blowing gun penetrates the distribution hopper and points to the raw material slag pan.

[0014] Furthermore, the particle collecting device includes a double-helix cyclone separator; a first grid wheel ash unloading valve is arranged at the lower end of the double-helix cyclone separator; the particle tray is arranged below the double-helix cyclone separator, and the upper end of the double-helix cyclone separator is connected to the second discharge channel.

[0015] Furthermore, the powder collecting device comprises a bag dust collector; a second grid wheel ash unloading valve is arranged at the lower end of the bag dust collector; and the powder tray is arranged below the bag dust collector.

[0016] The beneficial effect of the utility model is that high-pressure air is injected into the closed cavity through the high-pressure air injection device to suspend fine powder, while un-powdered large particles and metal particles cannot be suspended and fall to the block plate under the action of gravity, thereby realizing the separation of fine powder from large particles or metal particles, and after the suspended fine powder passes through the particle collecting device and the powder collecting device, the fine powder is classified into different particle sizes for collection, thereby realizing large-scale industrial utilization, and dust can be effectively avoided while collecting the fine powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the stainless steel slag processing system of the utility model.

[0018] Figure 2 It is a structural schematic diagram of the powder selection generating device of the utility model.

[0019] In the figure, 1-raw material slag tray; 2-outer shell; 3-movable cover; 4-block tray; 5-dividing hopper; 6-first discharge channel; 7-upper blowing gun; 8-lower blowing gun; 9-sealing valve; 10-electro-hydraulic push rod; 11-double spiral cyclone separator; 12-first grid wheel ash discharge valve; 13-granular material tray; 14-bag dust collector; 15-second discharge channel; 16-second grid wheel ash discharge valve; 17-powder tray; 18-channel steel welding bracket; 19-collecting bag. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] like Figure 1-Figure 2 The stainless steel slag processing system shown includes a steel slag pulverizing device, an annular slag pan conveying belt, a powder selection generating device, a granular material collecting device, a powder material collecting device and a slag iron recovery device.

[0022] The slag pulverizing device includes an insulation shell, a hot air blowing device connected to the insulation shell, and a hot air recovery device, wherein the raw material slag pan 1 is located on a ring-shaped slag pan conveying belt, and the raw material slag pan 1 enters the insulation shell under the driving action of the slag pan conveying belt, and the stainless steel slag on the raw material slag pan 1 is pulverized in the insulation shell. The hot air blowing device blows hot air into the insulation shell to cool the stainless steel slag, and the temperature and air volume of the blown hot air are controlled to control the cooling speed, and the hot air recovery device is used to collect waste heat to achieve waste heat recovery.

[0023] In this embodiment, the powder selection device includes: a raw material slag pan 1, a shell 2, a mobile cover 3, a high-pressure air injection device, a block material pan 4, a material distribution hopper 5 and a first discharge channel 6. A closed cavity is formed inside the shell 2; the raw material slag pan 1 is located in the closed cavity; the annular slag pan conveying belt also partially passes through the shell 2 and passes through the closed cavity, so that after the stainless steel slag on the raw material slag pan 1 of the heat-insulating shell of the steel slag pulverizing device is pulverized, under the action of the slag pan conveying belt, the raw material slag pan 1 after the stainless steel slag is pulverized enters the closed cavity in the shell 2 of the powder selection device.

[0024] The high-pressure air injection device is connected to the closed cavity and is used to inject high-pressure air into the closed cavity to suspend fine powder. The upper part of the shell 2 is sealed with a moving cover 3; the moving cover 3 is connected to the first discharge channel 6. The moving cover 3 provides space for the suspension of fine powder. The lower part of the shell 2 is connected to a channel steel welding bracket 18.

[0025] Specifically, the high-pressure air injection device includes an upper blowing gun 7 and a lower blowing gun 8; the upper blowing gun 7 is located above the raw material slag pan 1, and the upper blowing gun 7 penetrates the movable cover 3 and points to the raw material slag pan 1, and the lower blowing gun 8 is located below the raw material slag pan 1. Of course, the air outlets of the upper blowing gun 7 and the lower blowing gun 8 are both located in the closed cavity.

[0026] In this embodiment, there are three upper blowing guns 7. In practice, the number of upper blowing guns 7 may be more or less. The upper blowing guns 7 form a first angle with the horizontal plane, and are tilted toward the top of the raw material slag pan 1; the lower blowing guns 8 form a second angle with the horizontal plane, and are tilted toward the bottom of the raw material slag pan 1; the first angle is greater than or equal to the second angle. For example, the first angle is 60 degrees, and the second angle is 45 degrees.

[0027] Under the joint action of the upper blowing gun 7 and the lower blowing gun 8, compressed air is injected into the closed cavity to increase the air pressure in the closed cavity, so that the pulverized fine powder on the raw material slag pan 1 in the closed cavity is suspended. If the buoyancy provided by the upper blowing gun 7 is sufficient, the lower blowing gun 8 may not be used.

[0028] The block material tray 4 is located below the raw material slag tray 1, and the dividing hopper 5 is connected between the block material tray 4 and the raw material slag tray 1. The high-pressure air injection device can suspend the fine powder in the closed cavity, but the un-powdered large particles and metal particles on the raw material slag tray 1 cannot be suspended, and enter the block material tray 4 after passing through the dividing hopper 5 under the action of gravity.

[0029] A sealing valve 9 is provided at the lower end of the material distribution hopper 5, and an electro-hydraulic push rod 10 is connected to one side of the material distribution hopper 5; the electro-hydraulic push rod 10 is connected to the sealing valve 9. The lower blowing gun 8 penetrates the material distribution hopper 5 and points to the raw material slag pan 1. The opening and closing of the sealing valve 9 are driven by the electro-hydraulic push rod 10. When the sealing valve is in the closed state, the airtightness of the closed cavity is guaranteed, and the fine powder suspension effect is guaranteed.

[0030] The first discharge channel 6 is located above the housing 2, and is connected between the housing 2 and the pellet collecting device; a pellet tray 13 is provided at the lower end of the pellet collecting device. The fine powder suspended in the housing 2 and the moving cover 3 is sprayed by the lower spray gun 8, passes through the first discharge channel 6 and enters the pellet collecting device.

[0031] The un-powdered large particles and metal particles on the raw material slag pan 1 cannot be suspended. After the electro-hydraulic push rod 10 drives the sealing valve 9 to be in an open state, the un-powdered large particles and metal particles enter the block material pan 4 after passing through the funnel-shaped dividing hopper 5 under the action of gravity. The separation of fine powder and particles on the raw material slag pan 1 is achieved.

[0032] A second discharge channel 15 is connected between the granular material collecting device and the powder material collecting device; a powder material tray 17 is provided at the lower end of the powder material collecting device.

[0033] In this embodiment, the particle collecting device includes a double spiral cyclone separator 11; a first partition wheel ash unloading valve 12 is provided at the lower end of the double spiral cyclone separator 11; a particle tray 13 is provided below the double spiral cyclone separator 11, and a second discharge channel 15 is connected to the upper end of the double spiral cyclone separator 11.

[0034] The powder collecting device comprises a bag dust collector 14 ; a second grid wheel dust discharge valve 16 is arranged at the lower end of the bag dust collector 14 ; and a powder tray 17 is arranged below the bag dust collector 14 .

[0035] After the fine powder suspended in the powder selection device enters the double spiral cyclone separator 11, the fine powder with larger particle size passes through the opened first grid wheel ash discharge valve 12 and enters the granular material plate 13. The fine powder with smaller particle size enters the bag filter 14 through the second discharge channel 15. After the second grid wheel ash discharge valve 16 is opened, the fine powder with smaller particle size is collected by the powder plate 17. Under the joint action of the steel slag pulverization device, the powder selection device, the granular material collecting device and the powder collecting device, the stainless steel slag is pulverized to fine powder below 300 mesh, which can reach more than 80%. The suspended fine powder of the powder selection device is classified into different particle sizes for collection, and finally ultrafine powder with less than 700 mesh is obtained, which can be used as the raw material for preparing gel material and has good reaction activity.

[0036] The block tray 4 of the powder selection generating device enters the slag tray conveying belt, and under the transportation of the slag tray conveying belt, enters the slag iron recovery device and returns to the smelting process.

[0037] In some embodiments, Figure 2 As shown, the granular material collecting device and the powder collecting device can be replaced by the collecting bag 19. That is, the first discharge channel 6 of the powder selection generating device is directly connected to the collecting bag 19, so that the suspended powder directly enters the collecting bag 19.

[0038] The above are only preferred implementations of the utility model. The protection scope of the utility model is not limited to the above embodiments. All technical solutions under the idea of ​​the utility model belong to the protection scope of the utility model. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the utility model should also be regarded as the protection scope of the utility model.

Claims

1. A stainless steel slag processing system, characterized in that: It includes a powder selection generating device, a granular material collecting device and a powder material collecting device; The powder selection generating device comprises: a raw material slag pan, an outer shell, a high-pressure air injection device, a block material pan, a dividing hopper and a first discharge channel; a closed cavity is formed inside the outer shell; the raw material slag pan is located in the closed cavity; the high-pressure air injection device is connected to the closed cavity, and is used to inject high-pressure air into the closed cavity to suspend fine powder; the block material pan is located below the raw material slag pan, and the dividing hopper is connected between the block material pan and the raw material slag pan; the first discharge channel is located above the outer shell, and the first discharge channel is connected between the outer shell and the pellet collecting device; a pellet pan is provided at the lower end of the pellet collecting device; a second discharge channel is connected between the pellet collecting device and the powder collecting device; a powder pan is provided at the lower end of the powder collecting device.

2. A stainless steel slag processing system according to claim 1, characterized in that: The high-pressure air injection device comprises an upper blowing gun and a lower blowing gun; the upper blowing gun is located above the raw material slag pan, and the lower blowing gun is located below the raw material slag pan.

3. A stainless steel slag treatment system according to claim 2, characterized in that: The upper blowing gun forms a first angle with the horizontal plane, and is tilted toward the top of the raw material slag pan; the lower blowing gun forms a second angle with the horizontal plane, and is tilted toward the bottom of the raw material slag pan; the first angle is greater than or equal to the second angle.

4. A stainless steel slag treatment system according to claim 3, characterized in that: There are multiple upper blowing guns.

5. A stainless steel slag processing system according to claim 2, characterized in that: A moving cover is sealedly connected above the shell; the moving cover is communicated with the first discharge channel.

6. A stainless steel slag treatment system according to claim 5, characterized in that: The upper blowing gun penetrates the movable cover and points to the raw material slag pan.

7. A stainless steel slag processing system according to claim 2, characterized in that: A sealing valve is arranged at the lower end of the material distribution hopper, and an electro-hydraulic push rod is connected to one side of the material distribution hopper; the electro-hydraulic push rod is connected to the sealing valve.

8. A stainless steel slag treatment system according to claim 7, characterized in that: The lower blowing gun penetrates the distribution hopper and points to the raw material slag pan.

9. A stainless steel slag processing system according to claim 1, characterized in that: The granular material collecting device comprises a double-helix cyclone separator; a first grid wheel ash unloading valve is arranged at the lower end of the double-helix cyclone separator; the granular material tray is arranged below the double-helix cyclone separator, and the upper end of the double-helix cyclone separator is connected to the second discharge channel.

10. The stainless steel slag processing system according to claim 1, characterized in that: The powder collecting device comprises a bag dust collector; a second grid wheel ash unloading valve is arranged at the lower end of the bag dust collector; and the powder tray is arranged below the bag dust collector.

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