Pneumatic conveying device for arsenic trioxide

Abstract

The utility model discloses a pneumatic conveying device for arsenic trioxide, which structurally comprises a discharging bin arranged at a low position, a finished product storage tank arranged at a high position, a conveying pipeline communicated with the discharging bin and the finished product storage tank, and a first high-pressure air pipe communicated with the end, close to the discharging bin, of the conveying pipeline and used for conveying. The bottom of the discharging bin is communicated with a second high-pressure air pipe with the annular tail end and provided with a plurality of flexible air pipes, a pressure relief opening connected with a pressure relief pipe is formed in the side wall, close to the feeding opening, of the finished product storage tank, the tail end of the pressure relief pipe extends to the bottom of the absorption barrel, and liquid is contained in the absorption barrel. Through the arrangement of the second high-pressure gas pipe and the pressure relief pipe, arsenic trioxide powder enters the conveying pipeline in a fluidized form, gas which is higher in pressure and is completely used for conveying the fluidized powder can be introduced into the first high-pressure gas pipe, the loss of the conveying pressure is greatly reduced, and the conveying height is increased; the problems that an existing pneumatic conveying device is large in conveying pressure loss, insufficient in conveying height, prone to blockage of a conveying pipeline and the like are effectively solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of the transportation of arsenic trioxide, and particularly relates to a pneumatic conveying device for arsenic trioxide. Background Art

[0002] Arsenic trioxide is an odorless and tasteless white powder, commonly known as "arsenic", which is highly toxic. It is the most commercially valuable arsenic compound and an important chemical raw material for preparing elemental arsenic, etc. Arsenic trioxide is usually extracted from solid waste or roasting flue gas in gold smelting. The prepared arsenic trioxide needs to be transferred to a storage tank for storage. To provide the operation safety of operators, arsenic trioxide is usually transferred in a closed manner. The most common way is to transport it through a pressurized gas pipeline. An outlet bin is arranged at the bottom of the preparation equipment, and high-pressure gas is applied at the outlet of the bottom of the outlet bin to fluidize the powdered arsenic trioxide, and under the action of the high-pressure gas, it is transported to the top inlet of the finished product storage tank. However, to increase the storage capacity and the subsequent discharge of the finished product, most of the finished product storage tanks are arranged at a high place, which results in a large height difference between the outlet bin of the preparation equipment and the finished product storage tank. The air pressure loss during the transportation process is extremely large, often causing insufficient transportation pressure. Some arsenic trioxide powders are also likely to deposit in the transportation pipeline and cause blockage, which extremely affects the improvement of the transportation efficiency. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a pneumatic conveying device for arsenic trioxide to solve the problems of insufficient conveying pressure and easy blockage during the upward transportation of arsenic trioxide in the prior art.

[0004] The utility model is realized by the following technical solutions:

[0005] The utility model provides a pneumatic conveying device for arsenic trioxide, the structure of which includes an outlet bin arranged at a low place and a finished product storage tank arranged at a high place. An outlet is arranged at the bottom of the outlet bin, and a feed inlet is arranged at the top of the finished product storage tank. A transportation pipeline is arranged between the outlet and the feed inlet. A first high-pressure gas pipe for providing transportation pressure is communicated near the outlet of the transportation pipeline. Above the outlet outside the outlet bin, a second high-pressure gas pipe is arranged, and the second high-pressure gas pipe is communicated with the inside of the outlet bin. A pressure relief port is arranged on the side wall of the finished product storage tank near the feed inlet, and the pressure relief port is communicated with a pressure relief pipe. The end of the pressure relief pipe extends to the bottom of an absorption barrel, and a liquid is contained in the absorption barrel.

[0006] Based on the above technical solution, through the setting of the second high-pressure air pipe, the arsenic trioxide powder can be fluidized before entering the discharge port. The pressure provided by the first high-pressure air pipe is all used for the transportation of the fluidized powder, greatly reducing the loss of transportation pressure. At the same time, through the setting of the pressure relief pipe and the absorption barrel, a higher transportation air pressure can be allowed to ensure that the powder can be smoothly transported into the finished product storage tank, and at the same time, it will not cause an increase in the pressure of the storage tank and the escape of dust.

[0007] Preferably, the end of the second high-pressure air pipe is an annular air pipe arranged around the outer periphery of the discharge bin. At least three flexible air pipes are connected to the annular air pipe, and the flexible air pipes are connected to the inside of the discharge bin. This design can make the high-pressure gas form a convection cycle at the bottom of the discharge bin, making the powder easier to mix and having better fluidity.

[0008] Preferably, the discharge bin is in the shape of an inverted pear. This design can prevent a large amount of arsenic trioxide in the discharge bin from accumulating at the discharge port, facilitating the fluidization of the powder with a smaller air pressure and improving the fluidity.

[0009] Furthermore, an extension pipe is provided inside the feed inlet, and the opening end of the extension pipe is lower than the pressure relief port. This design is conducive to making more of the fluidized powder transported into the finished product storage tank deposit below, and is conducive to reducing the amount of powder entering the pressure relief pipe.

[0010] Preferably, the opening end of the extension pipe is in the shape of a flared mouth. This design is conducive to the powder being dispersed and falling in the finished product storage tank, while slowing down the flow rate of the transportation air pressure, reducing the high-pressure impact force, and reducing secondary dust generation.

[0011] Preferably, a filter layer with the same inner diameter as the finished product storage tank is provided inside the finished product storage tank. The extension pipe penetrates through the filter layer and the opening end of the extension pipe is located below the filter layer, and the pressure relief port is provided above the filter layer. This design is conducive to blocking the powder that has not settled yet and reducing the powder content at the top of the finished product storage tank.

[0012] Preferably, a filter cover net is provided on the side of the pressure relief port facing the finished product storage tank, and / or a filter screen is arranged inside the pressure relief port. This design reduces or blocks the powder from entering the pressure relief pipe from the pressure relief port end, avoiding both the deposition and blockage of the powder in the pressure relief pipe and reducing the loss of the finished product.

[0013] Preferably, a one-way check valve is provided on the pressure relief pipe, or an enlarged section is provided on the pressure relief pipe, and the enlarged section is used to prevent liquid backflow. This design can avoid the loss caused by the backflow of the liquid in the absorption barrel when the pressure inside and outside the finished product storage tank is unbalanced.

[0014] Furthermore, an upwardly inclined air inlet is provided in the middle section of the conveying pipeline, and the air inlet is connected to a third high-pressure air pipe. This design enables the high-pressure gas to flow in a spiral upward form after entering the conveying pipeline through the upwardly inclined air inlet and the third high-pressure air pipe, which is conducive to promoting the re-mixing of the powder, secondary fluidization, supplementing the conveying pressure, reducing the pressure loss, achieving a greater powder conveying height, and facilitating the design of a finished product storage tank with a larger capacity.

[0015] Beneficial effects

[0016] The beneficial effects of the above technical solution are as follows:

[0017] 1) Through the setting of the second high-pressure air pipe, the arsenic trioxide powder can be fluidized before entering the discharge port, and all the pressure provided by the first high-pressure air pipe is used for the conveying of the fluidized powder, greatly reducing the loss of the conveying pressure. At the same time, through the setting of the pressure relief pipe and the absorption barrel, a higher conveying air pressure can be allowed to ensure that the powder can be smoothly conveyed into the finished product storage tank without causing an increase in the tank pressure and the escape of dust. The utility model realizes the powder conveying with a greater conveying elevation through pressurization before discharging, effectively solving the problems of large conveying pressure loss, insufficient conveying height, and easy blockage of the conveying pipeline existing in the existing pneumatic conveying device. 2) By setting the end of the second high-pressure air pipe as a ring-shaped air pipe and a plurality of air inlets, a convection cycle is formed at the bottom of the discharge bin for the high-pressure gas, making the powder easier to mix and having better fluidity, further solving the problem of insufficient conveying height of the existing pneumatic conveying device.

[0018] 3) By providing an upwardly inclined air inlet and a third high-pressure air pipe in the middle section of the conveying pipeline, it not only supplements the conveying pressure but also promotes the secondary fluidization of the powder, reduces the conveying pressure loss, further increases the conveying elevation, and is suitable for use in scenarios with a larger output or a greater storage demand. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, purposes, and advantages of the present utility model will become more apparent:

[0020] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0021] Figure 2 It is a schematic diagram of the end of the second high-pressure air pipe of the present utility model;

[0022] Figure 3 It is a schematic diagram of the connection structure of the third high-pressure air pipe of the present utility model;

[0023] Figure 4 It is a schematic diagram of the internal structure of the finished product storage tank of the present utility model;

[0024] Figure 5 Schematic diagram of the pressure relief pipe structure of the present utility model;

[0025] In the figure: preparation equipment 1; discharge bin 2; discharge port 21; second high-pressure air pipe 3; annular air pipe 31; flexible air pipe 32; first high-pressure air pipe 4; conveying pipeline 5; air inlet 51; third high-pressure air pipe 6; finished product storage tank 7; feeding port 71; pressure relief port 72; extension pipe 73; open end 731; pressure relief pipe 8; one-way check valve 81; enlarged section 82; absorption barrel 9; filter layer 101; filter cover net 102; filter net 103. Specific embodiments

[0026] The present utility model will be further described in detail below in conjunction with embodiments, but the embodiments of the present utility model are not limited thereto.

[0027] As Figure 1 shown, the present utility model provides a pneumatic conveying device for arsenic trioxide, and its structure includes:

[0028] A discharge bin 2 provided at a low place, the discharge bin 2 is provided at the bottom of the preparation equipment 1 for the last process of preparing arsenic trioxide, the bottom of the discharge bin 2 is provided with a discharge port 21, preferably, the discharge bin 2 is in an inverted pear shape to prevent a large amount of arsenic trioxide in the discharge bin 2 from accumulating at the discharge port 21; outside the discharge bin 2, a second high-pressure air pipe 3 is provided above the discharge port 21, and the second high-pressure air pipe 3 is communicated with the inside of the discharge bin 2; preferably, the end of the second high-pressure air pipe 3 is an annular air pipe 31 arranged around the outer periphery of the discharge bin 2, and at least three flexible air pipes 32 are communicated with the annular air pipe 31, and the flexible air pipes 32 are communicated with the inside of the discharge bin 2. As Figure 2 shown, in this embodiment, four flexible air pipes 32 arranged in pairs are communicated with the annular air pipe 31. The arrangement of the annular air pipe 31 and multiple air inlets 51 can make the high-pressure gas form a convection cycle at the bottom of the discharge bin 2, making the powder easier to mix and having better fluidity.

[0029] A finished product storage tank 7 provided at a high place, the top of the finished product storage tank 7 is provided with a feeding port 71; a conveying pipeline 5 is provided between the discharge port 21 and the feeding port 71; a first high-pressure air pipe 4 for providing conveying pressure is communicated with the conveying pipeline 5 near the discharge port 21; a pressure relief port 72 is provided on the side wall of the finished product storage tank 7 near the feeding port 71; the pressure relief port 72 is communicated with a pressure relief pipe 8; the end of the pressure relief pipe 8 extends into the absorption barrel 9, and a liquid is contained in the absorption barrel 9, and the liquid can be pure water that does not react with arsenic trioxide (using insoluble sedimentation), or an acid solution or an alkali solution that can react with arsenic trioxide; the end of the pressure relief pipe 8 is arranged close to the bottom of the absorption barrel 9 so that the powder entering the absorption barrel 9 with the air flow can fully contact and react or settle with the liquid.

[0030] Further, as Figure 3 shown, an upwardly inclined air inlet 51 is provided in the middle section of the conveying pipeline 5. The air inlet 51 is communicated with a third high-pressure air pipe 6. After the gas in the third high-pressure air pipe 6 enters the conveying pipeline 5, it flows in a spiral upward manner under the limitation of the air inlet direction and the pipe wall. During the flowing process, the powder is driven to be mixed with the gas again, and the fluidity is increased, which not only supplements the conveying pressure, but also further reduces the conveying pressure loss, and a greater conveying elevation can be achieved.

[0031] Further, to prevent excessive powder in the finished product storage tank 7 from entering the pressure relief pipe 8 and causing blockage and product loss, as Figure 4 shown, an extension pipe 73 is provided inwardly at the feed inlet 71. The opening end 731 of the extension pipe 73 is in a flared shape, and the opening end 731 of the extension pipe 73 is lower than the pressure relief port 72; a filter layer 101 having the same inner diameter as the finished product storage tank 7 is provided in the finished product storage tank 7. The extension pipe 73 penetrates through the filter layer 101 and the opening end 731 of the extension pipe 73 is located below the filter layer 101, and the pressure relief port 72 is provided above the filter layer 101; a filter cover net 102 is provided on the side of the pressure relief port 72 facing the finished product storage tank 7, and a filter net 103 is arranged in the pressure relief port 72. The pore diameters of the filter layer 101, the filter cover net 102 and the filter net 103 are set according to the actual filtration degree requirements, and the material can be a conventional solid particle filtering mesh.

[0032] Further, to prevent the liquid in the absorption barrel 9 from flowing back into the finished product storage tank 7, as Figure 5 shown, a one-way check valve 81 and an enlarged section 82 are provided on the pressure relief pipe 8.

[0033] The above is only a preferred embodiment of the present invention, and does not impose any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the protection scope of the present invention.

Claims

1. A pneumatic conveying device for arsenic trioxide, the structure of which comprises a discharge bin arranged at a lower position and a finished product storage tank arranged at a higher position. The bottom of the discharge bin is provided with a discharge port, the top of the finished product storage tank is provided with a feed inlet, a conveying pipeline is arranged between the discharge port and the feed inlet, and a first high-pressure air pipe for providing conveying pressure is communicated with the conveying pipeline near the discharge port; It is characterized in that: Outside the discharge bin, a second high-pressure air pipe is provided above the discharge port. The second high-pressure air pipe is communicated with the inside of the discharge bin. A pressure relief port is provided on the side wall of the finished product storage tank close to the feed inlet. The pressure relief port is communicated with a pressure relief pipe. The end of the pressure relief pipe extends to the bottom of the absorption barrel, and a liquid is contained in the absorption barrel.

2. The pneumatic conveying device for arsenic trioxide according to claim 1, wherein: The end of the second high-pressure air pipe is an annular air pipe arranged around the outer periphery of the discharge bin. At least three flexible air pipes are communicated with the annular air pipe, and the flexible air pipes are communicated with the inside of the discharge bin.

3. The pneumatic conveying device for arsenic trioxide according to claim 1, characterized in that: The discharge bin is in an inverted pear shape.

4. A pneumatic conveying device for arsenic trioxide according to claim 1, characterized in that: An extension pipe is provided inward at the feed inlet, and the opening end of the extension pipe is lower than the pressure relief port.

5. The pneumatic conveying device for arsenic trioxide according to claim 4, characterized in that: The opening end of the extension pipe is in a flared shape.

6. The pneumatic conveying device for arsenic trioxide according to claim 4, characterized in that: A filter layer with the same inner diameter as the finished product storage tank is provided in the finished product storage tank. The extension pipe penetrates through the filter layer and the opening end of the extension pipe is located below the filter layer, and the pressure relief port is provided above the filter layer.

7. The pneumatic conveying device for arsenic trioxide according to claim 1, characterized in that: A filter cover net is provided on the side of the pressure relief port facing the finished product storage tank, and / or a filter net is arranged in the pressure relief port.

8. The pneumatic conveying device for arsenic trioxide according to claim 1, characterized in that: A one-way check valve is provided on the pressure relief pipe, or an enlarged section is provided on the pressure relief pipe, and the enlarged section is used to prevent liquid backflow.

9. The pneumatic conveying device for arsenic trioxide according to claim 1, characterized in that: An upwardly inclined air inlet is provided in the middle section of the conveying pipeline, and the air inlet is communicated with a third high-pressure air pipe.

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