Water circulation type gasification slag recycling device

Abstract

The utility model belongs to the technical field of furnace slag recycling, and relates to a water circulation type gasification furnace slag recycling device which comprises a gasification furnace slag pretreatment unit, a vacuum belt filter, a vacuum tank and a collecting pool which are sequentially communicated along the material flowing direction, the bottom of the vacuum belt filter is externally connected with a flushing pipeline; a water return pipeline is arranged around the collecting tank; a self-priming pump is arranged in the middle of the water return pipeline; one end of the water return pipeline is communicated with the collecting tank, and the other end of the water return pipeline is communicated with the flushing pipeline. According to the utility model, the water return pipeline and the self-priming pump are additionally arranged, and the filtered water in the collecting tank is used as the flushing water to flush the vacuum belt filter, so that the water consumption is reduced while the recycling of the gasification slag is realized, the water in the collecting tank is reduced, the load is reduced, and the operation is stable.

Description

Technical Field

[0001] This utility model belongs to the field of slag recycling technology, and relates to a water-circulating gasification slag recycling device. Background Technology

[0002] During the operation of a gasifier, coarse slag (also known as gasifier ash) is generated. In traditional processes, gasifier ash is mainly disposed of through stockpiling or landfilling, which not only occupies land but may also pollute water bodies and soil. Therefore, it is necessary to explore more environmentally friendly treatment methods for gasifier ash.

[0003] Since gasifier slag is mainly composed of silicon dioxide, alumina, calcium oxide, iron oxide, and residual carbon, it can be reused as an industrial raw material. For example, iron can be separated from the gasifier slag for smelting, and the remaining waste slag can be used to prepare ceramsite, cement, concrete wall materials, and bricks; metals in the gasifier slag can also be recycled.

[0004] Currently, the separation of metallic components from gasification slag mostly involves pretreatment processes such as roasting, leaching, and precipitation, followed by further separation of the metallic components for recycling. To improve separation efficiency, a vacuum belt filter is typically used for solid-liquid separation. The separated solid phase is the metallic component, and the separated filtrate is discharged into a collection tank. Simultaneously, the filtered water in the vacuum tank is periodically discharged into the collection tank, where the water can be reused in subsequent processes as needed. While existing methods can achieve the recycling of gasification slag, they have the following drawbacks: The vacuum belt filter requires a water seal to maintain a vacuum on the filter cloth during operation. Furthermore, flushing water is used at the bottom of the filter to clean the filter cloth, resulting in excessive flushing water volume. Since the flushing water is primary water (i.e., clean water), water consumption during the recycling process is high. In addition, a large amount of flushing water is eventually discharged into the collection tank via a drainage ditch, causing a rapid increase in the water volume in the collection tank, which can overload subsequent processes and lead to unstable operation. Utility Model Content

[0005] In view of the technical problems in the existing gasification slag recycling and utilization technology mentioned above, such as large water consumption and rapid increase in water volume in the collection tank, which leads to excessive load on subsequent processes and unstable operation, this utility model provides a water-circulating gasification slag recycling and utilization device.

[0006] This invention adds a return water pipeline and a self-priming pump to use the filtered water in the collection tank as flushing water to rinse the vacuum belt filter. This achieves the recycling of gasification slag while saving water consumption, reducing the amount of water in the collection tank, reducing the load, and ensuring stable operation.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] A water-circulating gasification slag recycling device includes a gasification slag pretreatment unit, a vacuum belt filter, a vacuum tank, and a collection tank connected sequentially along the material flow direction; a flushing pipeline is externally connected to the bottom of the vacuum belt filter; a return water pipeline is arranged around the collection tank; a self-priming pump is arranged in the middle of the return water pipeline; one end of the return water pipeline is connected to the collection tank, and the other end of the return water pipeline is connected to the flushing pipeline.

[0009] Furthermore, a centrifugal pump is also installed between the gasification slag pretreatment unit and the vacuum belt filter.

[0010] Furthermore, the water-circulating gasification slag recycling device also includes a flushing water tank, which is connected to a vacuum belt filter via a flushing pipeline.

[0011] Further specifying, the water-circulating gasification slag recycling device also includes a vacuum pump; one end of the vacuum pump is connected to the inside of the vacuum tank; the other end of the vacuum pump is connected to the flushing water tank.

[0012] Furthermore, a booster pump is also provided between the vacuum pump and the flushing water tank.

[0013] Further specifying, the gasification slag pretreatment unit includes a clear water tank, a stirring tank, an acid hydrolysis tank, a centrifuge, and a reagent tank connected sequentially along the feeding direction; the stirring tank is also externally connected to a gasification slag feed pipe; the reagent tank is connected to a vacuum belt filter through a centrifugal pump.

[0014] Furthermore, the gasification slag pretreatment unit also includes a feeder connected to the gasification slag feed pipe.

[0015] Furthermore, the gasification slag pretreatment unit also includes a slurry pump disposed between the stirring tank and the acid hydrolysis tank.

[0016] Furthermore, the gasification slag pretreatment unit also includes an acid slurry pump disposed between the acidolysis tank and the centrifuge.

[0017] Furthermore, the gasification slag pretreatment unit also includes an acid pump located between the centrifuge and the reagent tank.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] 1. This utility model, by adding a return water pipeline and a self-priming pump, uses the filtered water in the collection tank as flushing water to rinse the vacuum belt filter. The rinsed filtrate then flows back into the collection tank, forming a water circulation structure. This achieves the recycling of gasification slag while saving water consumption, reducing the water volume in the collection tank, decreasing the load, and ensuring stable operation.

[0020] 2. In this utility model, the water-circulating gasification slag recycling device also includes a vacuum pump; one end of the vacuum pump is connected to the inside of the vacuum tank; the other end of the vacuum pump is connected to the rinsing water tank. During use, some filtrate will be extracted during the vacuuming process of the vacuum tank. Since the vacuum pump is connected to the rinsing water tank, the extracted filtrate can be returned to the rinsing water tank as backup rinsing water, further saving water consumption and making the system operation more stable. Preferably, a booster pump is provided so that the filtrate extracted by the vacuum pump can smoothly flow into the rinsing water tank.

[0021] 3. In this utility model, the gasification slag pretreatment unit includes a clear water tank, a stirring tank, an acid hydrolysis tank, a centrifuge, and a reagent tank connected sequentially along the feeding direction; the stirring tank is also externally connected to a gasification slag feed pipe; the reagent tank is connected to a vacuum belt filter via a centrifugal pump. This allows the roasted gasification slag to be mixed with water to form a slurry, which is then subjected to acid dissolution, centrifugal separation, and sedimentation, thereby improving the metal recovery efficiency in the gasification slag. Attached Figure Description

[0022] Figure 1 A schematic diagram of the water-circulating gasification slag recycling device provided in Example 1;

[0023] Figure 2 This is a schematic diagram of the structure of a gasification furnace slag pretreatment unit;

[0024] Figure 3 This is a schematic diagram of the water-circulating gasification slag recycling device provided in Example 2;

[0025] in:

[0026] 10-Gasification slag pretreatment unit; 101-Feeder; 102-Clear water tank; 103-Stirring tank; 104-Slurry pump; 105-Acid hydrolysis tank; 106-Acid slurry pump; 107-Centrifuge; 108-Acid pump; 109-Reagent tank; 20-Centrifugal pump; 30-Vacuum belt filter; 40-Rinse water tank; 50-Rinse pipeline; 60-Vacuum tank; 70-Vacuum pump; 80-Collection tank; 90-Return water pipeline; 100-Self-priming pump; 110-Booster pump. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0028] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0029] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0030] Example 1

[0031] See Figure 1 This embodiment provides a water-circulating gasification slag recycling device, including a gasification slag pretreatment unit 10, a vacuum belt filter 30, a vacuum tank 60, and a collection tank 80 connected sequentially along the material flow direction; a flushing pipeline 50 is externally connected to the bottom of the vacuum belt filter 30; a return water pipeline 90 is arranged around the collection tank 80; a self-priming pump 100 is arranged in the middle of the return water pipeline 90; one end of the return water pipeline 90 is connected to the inside of the collection tank 80, and the other end of the return water pipeline 90 is connected to the flushing pipeline 50.

[0032] In this embodiment, a centrifugal pump 20 is also provided between the gasification slag pretreatment unit 10 and the vacuum belt filter 30.

[0033] See Figure 2 In this embodiment, the gasification slag pretreatment unit 10 includes a clear water tank 102, a stirring tank 103, an acid hydrolysis tank 105, a centrifuge 107, and a reagent tank 109 connected sequentially along the feeding direction; the stirring tank 103 is also externally connected to a gasification slag feed pipe; the reagent tank 109 is connected to a vacuum belt filter 30 through a centrifugal pump 20.

[0034] In this embodiment, the gasification slag pretreatment unit 10 also includes a feeder 101 connected to the gasification slag feed pipe.

[0035] In this embodiment, the gasification slag pretreatment unit 10 also includes a slurry pump 104 disposed between the stirring tank 103 and the acid hydrolysis tank 105.

[0036] In this embodiment, the gasification slag pretreatment unit 10 also includes an acid slurry pump 106 disposed between the acid hydrolysis tank 105 and the centrifuge 107.

[0037] In this embodiment, the gasification slag pretreatment unit 10 also includes an acid pump 108 disposed between the centrifuge 107 and the reagent tank 109.

[0038] Specifically, the mixing tank 103 is also externally connected to a water supply pipeline and a discharge pipeline; the feeder 101 is connected to the gasification slag feed pipe and is used to feed the roasted gasification slag into the mixing tank 103; the clear water tank 102 is connected to the water supply pipeline and is used to add water into the mixing tank 103; the roasted gasification slag and water are mixed evenly in the mixing tank 103 to form a slurry, which finally flows out from the discharge pipeline and is sent into the acid hydrolysis tank 105 through the slurry pump 104.

[0039] In acidolysis tank 105, the slurry reacts with the acid solution to dissolve the metal ions in the gasification slag into the acid solution; then all materials (the acid solution containing dissolved metal ions and the undissolved gasification slag) are transported to centrifuge 107 via acid slurry pump 106 for solid-liquid separation; the separated solid phase is discharged to the outside for collection; the acid solution containing dissolved metal is transported to reagent tank 109 via acid solution pump 108; at the same time, alkaline reagents (such as sodium hydroxide or potassium hydroxide) are added to reagent tank 109 to precipitate the metal ions dissolved in the acid solution, forming metal precipitates; after precipitation is complete, all materials in reagent tank 109 are transported to vacuum belt filter 30 via centrifuge pump 20 for separation.

[0040] All materials in the reagent tank 109 are separated into filter cake and filtrate by the vacuum belt filter 30. The filter cake (i.e., metal precipitate) is collected from the vacuum belt filter 30; the filtrate is discharged from the side of the vacuum belt filter 30 into the collection tank 80. During the operation of the vacuum belt filter 30, a vacuum tank 60 is used to create a vacuum. Since some filtrate is drawn into the vacuum tank 60, the vacuum tank 60 periodically discharges the filtrate into the collection tank 80. The filtrate in the collection tank 80 is divided into two paths: one path is sent to subsequent processes for reuse as needed; the other path, driven by the self-priming pump 100, flows through the return water pipeline 90 into the flushing pipeline 50 as flushing water for reuse. The flushed filtrate then flows back into the collection tank 80, creating a water circulation structure for the filtrate. This reduces the consumption of flushing water and also reduces the amount of filtrate ultimately entering the collection tank 80, thereby reducing the burden on subsequent reuse and improving operational stability.

[0041] The water-circulating gasification slag recycling device provided in this embodiment also includes a flushing water tank 40, which is connected to a vacuum belt filter 30 via a flushing pipeline 50. Water in the flushing water tank 40 enters the vacuum belt filter 30 through the flushing pipeline 50 to flush the filter cloth of the vacuum belt filter 30. Thus, when the flushing water in the collection tank 80 is insufficient for water reuse, the pre-stored water in the flushing water tank 40 can be used for flushing.

[0042] Example 2

[0043] See Figure 3 Based on Example 1, the water-circulating gasification slag recycling device provided in this embodiment also includes a vacuum pump 70. The vacuum pump 70 on the vacuum tank 60 performs vacuuming, enabling the vacuum belt filter 30 to operate normally. Therefore, one end of the vacuum pump 70 is connected to the inside of the vacuum tank 60; the other end of the vacuum pump 70 is connected to the rinsing water tank 40. This is because during vacuuming, some filtrate is drawn into the vacuum tank 60. At this time, the outlet of the vacuum pump 70 is connected to the rinsing water tank 40, sending the extracted filtrate to the rinsing water tank 40 as rinsing water for later use, thereby reducing the consumption of rinsing water.

[0044] The water-circulating gasification slag recycling device provided in this embodiment also includes a booster pump 110 disposed between the vacuum pump 70 and the flushing water tank 40. In use, the booster pump 110 increases the pressure of the extracted filtrate so that it can be smoothly discharged into the flushing water tank 40.

[0045] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A water-circulating gasification furnace slag recovery and utilization device, characterized in that, The system includes a gasification slag pretreatment unit (10), a vacuum belt filter (30), a vacuum tank (60), and a collection tank (80) connected sequentially along the material flow direction; a flushing pipeline (50) is connected to the bottom of the vacuum belt filter (30); a return water pipeline (90) is arranged around the collection tank (80); a self-priming pump (100) is arranged in the middle of the return water pipeline (90); one end of the return water pipeline (90) is connected to the collection tank (80), and the other end of the return water pipeline (90) is connected to the flushing pipeline (50).

2. The water-circulating gasification slag recovery and utilization device according to claim 1, characterized in that, A centrifugal pump (20) is also installed between the gasification slag pretreatment unit (10) and the vacuum belt filter (30).

3. The water-circulating gasification slag recovery and utilization device according to claim 2, characterized in that, The water-circulating gasification slag recycling device also includes a flushing water tank (40), which is connected to a vacuum belt filter (30) via a flushing pipeline (50).

4. The water-circulating gasification slag recovery and utilization device according to claim 3, characterized in that, The water-circulating gasification slag recycling device also includes a vacuum pump (70); one end of the vacuum pump (70) is connected to the inside of the vacuum tank (60); the other end of the vacuum pump (70) is connected to the flushing water tank (40).

5. The water-circulating gasification slag recovery and utilization device according to claim 4, characterized in that, A booster pump (110) is also provided between the vacuum pump (70) and the flushing water tank (40).

6. The water-circulating gasification slag recovery and utilization device according to any one of claims 1-5, characterized in that, The gasification slag pretreatment unit (10) includes a clear water tank (102), a stirring tank (103), an acid hydrolysis tank (105), a centrifuge (107), and a reagent tank (109) connected sequentially along the feeding direction; the stirring tank (103) is also externally connected to a gasification slag feed pipe; the reagent tank (109) is connected to a vacuum belt filter (30) through a centrifugal pump (20).

7. The water-circulating gasification slag recovery and utilization device according to claim 6, characterized in that, The gasification slag pretreatment unit (10) also includes a feeder (101) connected to the gasification slag feed pipe.

8. The water-circulating gasification slag recovery and utilization device according to claim 7, characterized in that, The gasification slag pretreatment unit (10) also includes a slurry pump (104) located between the stirring tank (103) and the acid hydrolysis tank (105).

9. The water-circulating gasification slag recovery and utilization device according to claim 7, characterized in that, The gasification slag pretreatment unit (10) also includes an acid slurry pump (106) disposed between the acid hydrolysis tank (105) and the centrifuge (107).

10. The water-circulating gasification slag recovery and utilization device according to claim 7, characterized in that, The gasification slag pretreatment unit (10) also includes an acid pump (108) located between the centrifuge (107) and the reagent tank (109).

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