Lime powder classification recycling system in calcium carbide production

Abstract

The utility model belongs to the technical field of resource recycling, and relates to a lime powder classification recycling system in calcium carbide production, which comprises a plane rotary screen, a pneumatic conveying bin and a belt conveyor, the plane rotary screen is respectively communicated with the pneumatic conveying bin and the belt conveyor; the plane rotary screen comprises a box body and an upper screen mesh arranged on the cross section in the box body, the box body is divided into an upper chamber and a lower chamber by the screen mesh, and the upper chamber is communicated with the belt conveyor; and the lower chamber is communicated with the pneumatic conveying bin. According to the lime powder classified recycling system in calcium carbide production, lime powder is recycled in a classified mode, the utilization degree of the lime powder is greatly improved, and economic benefits are remarkably improved.

Description

Technical Field

[0001] This utility model belongs to the field of resource recycling technology and relates to a system for classifying and recycling lime powder in calcium carbide production. Background Technology

[0002] Lime powder is a byproduct of calcium carbide production. While lime powder is composed of coarse calcium oxide, some of it will transform into fine calcium hydroxide powder during long-term storage. Current methods for handling these byproducts involve direct sale for use in glass and building materials manufacturing, as an additive in cement, and as a filler in the rubber, plastics, paper, coatings, and ink industries. While these methods achieve resource reuse, they suffer from several problems: the demand for lime powder as an additive is not high, and its price is low, resulting in low resource utilization and failing to maximize its value. Furthermore, some manufacturers directly briquette lime powder, but the presence of calcium hydroxide makes the resulting briquettes unsuitable for calcium carbide furnace production. Utility Model Content

[0003] To address the technical problem of low utilization of existing lime powder resources, this utility model provides a lime powder classification and recycling system for calcium carbide production. This system classifies and recycles lime powder, greatly improving its utilization rate and significantly enhancing economic benefits.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A lime powder sorting and recycling system for calcium carbide production includes a flat rotary screen, a pneumatic conveying bin, and a belt conveyor; the flat rotary screen is connected to both the pneumatic conveying bin and the belt conveyor.

[0006] Further defined, the planar rotary screen includes a box body and a screen placed on the cross-section of the box body. The screen divides the box body into an upper chamber and a lower chamber. The upper chamber is connected to a belt conveyor, and the lower chamber is connected to a pneumatic conveying chamber.

[0007] Further specified, the upper chamber is provided with a feed inlet and an upper discharge outlet located below the feed inlet, the upper discharge outlet being located above the screen; the feed inlet is connected to the belt conveyor via the upper discharge outlet.

[0008] Further specified, the lower chamber is provided with a lower discharge port, and the inlet is connected to the pneumatic conveying chamber via a screen and the lower discharge port.

[0009] Further specified, the screen is inclined inside the box; the screen aperture size is 1mm.

[0010] Furthermore, the lime powder classification and recycling system in calcium carbide production also includes a powder silo connected to the feed inlet.

[0011] Furthermore, the lime powder classification and recycling system in calcium carbide production also includes a discharger installed between the powder silo and the feed inlet.

[0012] Furthermore, the lime powder classification and recycling system in calcium carbide production also includes a buffer chamber located between the lower discharge port and the pneumatic conveying chamber.

[0013] Furthermore, the lime powder classification and recycling system in calcium carbide production also includes a dust collector and a dust removal fan connected to the dust collector; the dust collector is connected to a planar rotary screen and a belt conveyor respectively.

[0014] Furthermore, the belt conveyor is a closed structure.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. This utility model involves sieving lime powder and then classifying it according to its composition into fine powder mainly composed of calcium hydroxide and coarse powder mainly composed of calcium oxide. After separation, the finer powder mainly composed of calcium hydroxide is sent outside the system for use as a desulfurizing agent, while the coarse powder mainly composed of calcium oxide is sent to briquetting for use as a supporting skeleton to improve the compactness of the briquetting ball. By classifying the lime powder according to its composition, the maximum utilization of lime powder can be achieved.

[0017] 2. In this utility model, lime powder is classified by a sieve. Preferably, the sieve mesh size is 1mm. This separates coarse calcium oxide powder of 1-5mm and fine calcium hydroxide powder of less than 1mm. The amount of coarse calcium oxide powder is 80% of the total amount of lime powder. This part of coarse calcium oxide powder serves as a supporting skeleton for briquetting, further enhancing the density of the briquetting and increasing the briquetting rate. It also contains almost no calcium hydroxide, which is beneficial for subsequent calcium carbide furnace production.

[0018] 3. In this utility model, the coarse calcium oxide powder separated by screening accounts for 80% of the total mass of lime powder. According to market prices, lime powder costs 100 yuan / ton, while finished calcium oxide costs 300 yuan / ton. When 80% of the coarse calcium oxide powder in the lime powder replaces the finished calcium oxide for briquetting, the economic benefit of lime powder increases from 100 yuan / ton to 260 yuan / ton, significantly increasing economic benefits.

[0019] 4. This utility model is equipped with a dust collector and a dust removal fan, which can collect dust during the screening and conveying process, prevent dust from entering the operation site, avoid pollution to the operation site, and ensure the health of the on-site operators. Attached Figure Description

[0020] Figure 1 System diagram provided for this utility model;

[0021] in:

[0022] 1—Powder silo; 2—Slide gate valve; 3—Unloader; 4—Plane rotary screen; 5—Manual slide gate valve; 6—Pneumatic slide gate valve; 7—Belt conveyor; 8—Buffer silo; 9—Gate valve; 10—Pneumatic conveying silo; 11—Dust collector; 12—Dust collector fan. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0024] See Figure 1 This utility model provides a lime powder classification and recycling system for calcium carbide production, including a flat rotary screen 4, a pneumatic conveying chamber 10 and a belt conveyor 7. The flat rotary screen 4 is connected to the pneumatic conveying chamber 10 and the belt conveyor 7 respectively.

[0025] This invention also includes a powder silo 1 for storing lime powder produced during calcium carbide production. The lime powder has a particle size of 0-5 mm, but is greater than 0 mm. The powder silo 1 is connected to a flat rotary screen 4, and the stored lime powder is fed into the flat rotary screen 4.

[0026] During implementation, lime powder can also be fed into the flat rotary screen 4 for screening through other means such as conveying pipes.

[0027] The planar rotary screen 4 includes a housing and a screen placed on the cross-section of the housing, which divides the housing into an upper chamber and a lower chamber. The upper chamber is connected to the powder silo 1 and the belt conveyor 7, respectively; the lower chamber is connected to the pneumatic conveying silo 10.

[0028] The working principle of the planar rotary screen 4 is as follows: it utilizes the motion of an eccentric machine, which is a reciprocating uniform rotary motion, and transmits the motion to the screen (i.e., the housing) through a drive mechanism. In practice, the planar rotary screen 4 relies on an externally connected drive mechanism to rotate and screen the lime powder.

[0029] Specifically, the upper chamber is provided with a feed inlet and an upper discharge outlet located below the feed inlet, with the upper discharge outlet located above the screen; the powder silo 1 is connected to the belt conveyor 7 via the feed inlet and the discharge outlet.

[0030] Specifically, a lower discharge port is provided on the lower chamber, and the inlet is connected to the pneumatic conveying chamber 10 via a screen and the lower discharge port.

[0031] To improve screening efficiency, the screen is set at an angle inside the box, and the screen contacts the inner wall of the box.

[0032] Analysis revealed that lime powder contains two different components: coarse calcium oxide powder and fine calcium hydroxide powder. These two components have different particle sizes, with the fine calcium hydroxide powder having a particle size of almost all below 1 mm. Therefore, the preferred screen size for this invention is 1 mm. This allows for the classification of the two substances in the calcium carbide lime powder based on their particle size, which improves the utilization rate of lime powder and increases economic benefits.

[0033] Furthermore, the lime powder classification and recycling system in calcium carbide production also includes a pneumatic conveying chamber 10 connected to the buffer chamber 8. A gate valve 9 is installed between the buffer chamber 8 and the pneumatic conveying chamber 10. A pneumatic conveying pump is connected to the pneumatic conveying chamber 10, and the material in the buffer chamber 8 is discharged out of the system through the pneumatic conveying chamber 10 by the pneumatic conveying pump.

[0034] The lime powder classification and recycling system in calcium carbide production also includes a gate valve 2 and a discharger 3; the powder silo 1 is connected to the flat rotary screen 4 in sequence via the gate valve 2 and the discharger 3.

[0035] The slide gate valve 2 can be operated manually or pneumatically. The unloader 3 is a rotary valve.

[0036] The lime powder classification and recycling system in calcium carbide production also includes a manual slide gate valve 5 and a pneumatic slide gate valve 6; the flat rotary screen 4 is connected to the manual slide gate valve 5, the pneumatic slide gate valve 6 and the pneumatic conveying chamber 10 in sequence.

[0037] Specifically, the discharge port is connected in sequence to a manual slide gate valve 5, a pneumatic slide gate valve 6, and a pneumatic conveying chamber 10.

[0038] The function of the belt conveyor 7 is to transport the separated coarse calcium oxide powder. Preferably, the belt conveyor 7 is a closed structure, which can avoid dust generation during the conveying process.

[0039] In this utility model, the flat rotary screen 4 is used to achieve vibratory screening, the pneumatic conveying bin 10 is used to store and transport fine powder, and the belt conveyor 7 is used to transport coarse powder. In specific implementation, other equipment with the same working principle or function can be selected for replacement.

[0040] The lime powder classification and recycling system in calcium carbide production also includes a dust collector 11 and a dust collector fan 12 connected to the dust collector 11; the dust collector 11 is connected to a flat rotary screen 4 and a belt conveyor 7 respectively.

[0041] Specifically, a dustproof outlet is provided on the upper chamber. The dustproof outlet is located above the upper discharge port and is connected to the dust collector 11. The dust collector 11 is also connected to the connecting pipeline between the flat rotary screen 4 and the belt conveyor 7. This can collect dust during the screening and conveying process, prevent dust from entering the operation site, avoid pollution to the operation site, and ensure the health of the on-site operators.

[0042] The lime powder classification and recycling system provided by this utility model, in its implementation, 0-5mm lime powder is transported to the powder silo 1, and then enters the upper chamber of the flat rotary screen 4 through the inlet via the gate valve 2 and the unloader 3. The 0-5mm lime powder is divided into two categories through a 1mm screen: coarse calcium oxide particles with a particle size greater than 1mm and less than 5mm (accounting for 80% of the total mass of lime powder) and fine calcium hydroxide particles with a particle size less than 1mm.

[0043] Fine calcium hydroxide powder particles fall through the screen into the lower chamber, then through the lower discharge port, and then through the manual gate valve 5 and the pneumatic gate valve 6 into the buffer chamber 8. Under the action of the pneumatic conveying pump, they are then discharged from the system through the gate valve 9 and the pneumatic conveying chamber 10 to be used as a desulfurizing agent. Coarse calcium oxide powder particles, being larger than the screen mesh, are trapped above the screen and sent from the upper discharge port to the subsequent briquetting system via a closed belt conveyor 7. They are mixed with the finished calcium oxide powder to form briquettes. The coarse calcium oxide powder particles act as a supporting framework, improving the density of the calcium oxide briquettes and ensuring the quality of the briquettes meets the requirements of calcium carbide furnace production. This enhances the utilization of calcium carbide and lime powder resources. Furthermore, based on market prices, lime powder costs 100 yuan / ton, while finished calcium oxide costs 300 yuan / ton. When 80% of the lime powder is coarse calcium oxide powder replacing the finished calcium oxide powder in briquetting, the value of lime powder increases from 100 yuan / ton to 260 yuan / ton, significantly increasing economic benefits.

[0044] The above is a specific embodiment of the present utility model. The above embodiments and specific parameters are only for clearly illustrating the verification process of the technical solution of the present utility model, and are not intended to limit the protection scope of the present utility model. All equivalent changes made on the basis of the technical principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A lime powder classification recycling system in calcium carbide production, characterized by, The system comprises a plane rotary screen (4), a pneumatic conveying bin (10) and a belt conveyor (7); the plane rotary screen (4) is communicated with the pneumatic conveying bin (10) and the belt conveyor (7) respectively.

2. The lime powder classification recycling system in the calcium carbide production according to claim 1, characterized in that, The plane rotary screen (4) comprises a box body and a screen mesh arranged in the box body in a cross section, the screen mesh divides the box body into an upper chamber and a lower chamber; the upper chamber is communicated with the belt conveyor (7); the lower chamber is communicated with the pneumatic conveying bin (10).

3. The lime powder classification recycling system in the calcium carbide production according to claim 2, characterized in that, An inlet and an upper outlet below the inlet are arranged on the upper chamber respectively; the upper outlet is above the screen mesh; the inlet is communicated with the belt conveyor (7) through the upper outlet.

4. The lime powder classification recycling system in the calcium carbide production according to claim 3, characterized by, A lower outlet is arranged on the lower chamber; the inlet is communicated with the pneumatic conveying bin (10) through the screen mesh and the lower outlet.

5. The lime powder classification recycling system in the calcium carbide production according to claim 4, characterized in that, The screen mesh is arranged in the box body in an inclined manner; the size of the screen hole of the screen mesh is 1mm.

6. The lime powder classification recycling system in the calcium carbide production according to claim 5, characterized in that, The system for classifying and recycling lime powder in the production of calcium carbide further comprises a powder bin (1) communicated with the inlet.

7. The lime powder classification recycling system in the calcium carbide production according to claim 6, characterized in that, The system for classifying and recycling lime powder in the production of calcium carbide further comprises a discharger (3) arranged between the powder bin (1) and the inlet.

8. The lime powder classification recycling system in the calcium carbide production according to claim 7, characterized in that, The system for classifying and recycling lime powder in the production of calcium carbide further comprises a buffer bin (8) arranged between the lower outlet and the pneumatic conveying bin (10).

9. The lime classification recycling system in the calcium carbide production according to any one of claims 1-8, characterized in that, The system for classifying and recycling lime powder in the production of calcium carbide further comprises a dust remover (11) and a dust removal fan (12) communicated with the dust remover (11); the dust remover (11) is communicated with the plane rotary screen (4) and the belt conveyor (7) respectively.

10. The lime powder classification recycling system in the calcium carbide production according to claim 9, characterized in that, The belt conveyor (7) is of a closed structure.

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