Thickening machine for arsenic acid-containing sewage neutralization solution

Abstract

The utility model discloses an arsenic acid-containing sewage neutralization solution thickening machine, and belongs to the field of sewage treatment equipment. The bottom of the tank body is provided with a slurry discharge pipe, and the top of the tank body is provided with a sealing gas cover; a central cylinder is arranged in the tank body; the bottom of the central cylinder is opened; a drainage structure is arranged on the inner wall of the tank; a feeding pipe is arranged on the tank body, one end of a discharging opening of the feeding pipe penetrates through the wall of the tank body and extends into the central cylinder, and one end of a feeding opening of the feeding pipe is connected with a feeding pump outside the tank body; an exhaust device is arranged on the sealing gas cover; a feeding pump is used for pumping a mixed solution of a neutralizing solution and a flocculating agent into a central cylinder in the center of the tank body for mixed reaction; the neutralization liquid and the flocculating agent complete suspended matter aggregation in the central cylinder to form aggregates heavier than water; and then the neutralization liquid and the formed aggregate are discharged from an opening in the bottom of the central cylinder, the aggregate can continue to settle into the sludge storage section due to being heavier than water, clear water ascends and overflows into an annular drainage groove, and thus solid-liquid separation is completed.

Description

Technical Field

[0001] The utility model relates to the field of sewage treatment equipment, in particular to a thickener for arsenic-containing acid sewage neutralization liquid. Background Art

[0002] The copper smelting flue gas acid-making purification system discharges arsenic-containing waste acid every day. In addition, rainwater collection, acid-containing industrial wastewater from acid-making plants, electrolysis plants, etc. are all collected and treated in the acid-making sewage treatment workshop, resulting in a huge output of arsenic-containing acid sewage. There is a current method for treating arsenic-containing acid sewage: adding carbide slag to the arsenic-containing acid sewage to react and generate a neutralization liquid with a pH value of 10 - 11. The carbide slag reacts with the arsenic-containing acid sewage to generate a neutralization slag with a solid content of 22% (weight concentration) and a density of 1.06 t / m 3 , and the arsenic content reaches 2%; the particle size of the neutralization slag is 270 - 400 mesh. The neutralization liquid has the following characteristics: First, SS and BOD in the neutralization liquid are suspended on the water surface and are not easy to settle; after adding a flocculant, its sedimentation rate is between 0.1 - 0.2 mm / s, and a long sedimentation time is required. Second, the neutralization liquid is alkaline, with a temperature of 30 - 40 degrees, and a large amount of water vapor escapes. The arsenic in the water vapor will pollute the environment.

[0003] In the prior art, the neutralization liquid needs to be preliminarily separated into solid and liquid to remove most of the water, and the neutralization liquid is concentrated to a solid content of more than 50%; in the second step, the neutralization liquid with a solid content of 50% after thickening is sent to a high-efficiency centrifuge to remove water. The clear water separated by the centrifuge is sent to a sedimentation tank for sedimentation again. The arsenic-containing neutralization slag dewatered by the centrifuge contains about 18% arsenic and 32% water. Summary of the Invention

[0004] The purpose of the utility model is to provide a thickener for arsenic-containing acid sewage neutralization liquid, which is used for preliminarily removing most of the water from the neutralization liquid.

[0005] The technical scheme adopted by the utility model is as follows:

[0006] The utility model provides a thickener for arsenic-containing acid sewage neutralization liquid, which includes a tank body. A slurry discharge pipe is arranged at the bottom of the tank body, and a sealed gas cover is installed at the top of the tank body; a central cylinder is arranged inside the tank body, and the bottom of the central cylinder is open; a drainage structure is arranged on the inner wall of the tank body; a feed pipe is arranged on the tank body, and the discharge port end of the feed pipe passes through the tank wall and extends into the inside of the central cylinder. The feed port end of the feed pipe is connected to a feed pump outside the tank body; an exhaust device is arranged on the sealed gas cover.

[0007] Furthermore, the tank body is composed of an upper cylindrical sedimentation section and a lower conical sludge storage section.

[0008] Furthermore, exhaust holes are arranged on the sealed gas cover, and the exhaust holes are introduced into the desulfurization system through an exhaust pipeline.

[0009] Furthermore, the drainage structure is an annular drainage groove arranged on the inner wall of the settlement section. The surface of the drainage groove located inside the tank body is provided with water inlet holes, and the drainage groove is connected with a clear water delivery pipe.

[0010] Furthermore, it further includes a stirring device. The stirring device includes a stirring main shaft, a stirring drive, a large stirring paddle, and a small stirring paddle. The stirring main shaft is vertically installed in the center of the tank body, and the stirring main shaft extends upward through the central cylinder to connect with the stirring drive. The stirring drive is installed on the sealing air cover. The stirring main shaft extends downward to the bottom of the tank body. The large stirring paddle is arranged on the stirring main shaft in the sludge storage section, and the small stirring paddle is arranged at the bottom of the stirring main shaft.

[0011] Furthermore, the large stirring paddle adopts a bracket-shaped blade. The bracket-shaped blade has a scraping wall part close to the inner wall of the sludge storage section. During the rotation of the stirring main shaft, the scraping wall part can scrape the inner wall of the sludge storage section.

[0012] Furthermore, the small stirring paddle adopts a marine blade.

[0013] The beneficial effects of the present utility model are as follows: The present utility model provides a thickener for arsenic acid-containing sewage neutralization liquid. A feeding pump is used to pump the mixed liquid of the neutralization liquid and the flocculant into the central cylinder in the center of the tank body for mixing reaction, so that the flocculant can play the maximum aggregation role. The neutralization liquid and the flocculant complete the aggregation of suspended substances in the central cylinder to form aggregates heavier than water in weight. Then, the neutralization liquid and the formed aggregates are discharged from the opening at the bottom of the central cylinder. Since the aggregates are heavier than water, they will continue to settle into the sludge storage section, and the clear water rises and overflows into the annular drainage groove, thereby completing the solid-liquid separation. Finally, the thick slurry in the sludge storage section is discharged from the tank body through the slurry discharge pipe at the bottom of the tank body; the clear water is sent to the industrial clear water pool for standby through the clear water delivery pipe. Description of the Drawings

[0014] Figure 1 It is a structural cross-sectional view of a thickener for arsenic acid-containing sewage neutralization liquid provided in Embodiment 1 of the present application.

[0015] Figure 2 It is a structural cross-sectional view of the improved thickener of the present application.

[0016] Description of the reference numerals: tank body 1, settlement section 101, sludge storage section 102, sealing air cover 2, central cylinder 3, feeding pipe 4, drainage structure 5, slurry discharge pipe 6, exhaust pipeline 7, clear water delivery pipe 8, flat steel frame 9, central cylinder fixing frame 10, stirring main shaft 11, stirring drive 12, large stirring paddle 13, scraping wall part 131, small stirring paddle 14, cleaning manhole 15. Detailed Embodiments

[0017] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0018] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model.

[0019] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "plurality" is two or more.

[0020] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0021] See Figure 1 Shown is a structural cross-sectional view of a thickener for arsenic acid-containing sewage neutralization liquid provided in Embodiment 1 of the present application. The thickener includes a tank body 1, a sealed gas cover 2, a central cylinder 3, a feed pipe 4, and a drainage structure 5. As shown in the figure, the tank body 1 is composed of an upper cylindrical sedimentation section 101 and a lower conical sludge storage section 102. A slurry discharge pipe 6 is provided at the bottom of the sludge storage section 102, and the slurry discharge pipe 6 pumps out the materials at the bottom of the tank body 1 through a pump. The top of the tank body 1 is closed by a sealed gas cover 2.

[0022] Since the temperature of the neutralized liquid containing arsenic acid wastewater is between 30 and 40 degrees, a large amount of water vapor emerges, and the arsenic contained in the water vapor will pollute the environment. For this reason, an exhaust device is provided in the present application to discharge the generated water vapor out of the tank body 1 and introduce it into the desulfurization system for deep treatment and discharge after reaching the standard. Specifically, an exhaust hole is provided on the sealing gas cover 2, and the exhaust hole is introduced into the desulfurization system through the exhaust pipe 7.

[0023] Furthermore, a central tube 3 is provided in the center of the sedimentation section 101, and the bottom of the central tube 3 is open; one end of the discharge port of the feed pipe 4 passes through the tank wall and extends into the interior of the central tube 3, and one end of the feed port of the feed pipe 4 is connected to the feed pump outside the tank; the discharge port of the feed pipe 4 is located above the interior of the central tube 3; in addition, a drainage structure 5 is provided on the side wall of the sedimentation section 101, and the position of the drainage structure 5 is higher than the bottom opening of the central tube 3, and is consistent with the height of the discharge port of the feed pipe 4 or lower than the discharge port of the feed pipe 4. In a specific embodiment, the drainage structure 5 is an annular drainage groove provided on the inner wall of the sedimentation section 101, and a water inlet hole is provided on the surface of the drainage groove located inside the tank 1, and a clean water delivery pipe 8 is connected to the drainage groove.

[0024] The working principle of the thickener mentioned above in the present application is as follows: use a feed pump to pump the mixed solution of the neutralizing liquid and the flocculant into the central tube 3 in the center of the tank body 1 for mixing and reaction, so that the flocculant can play the greatest aggregation effect; the neutralizing liquid and the flocculant complete the aggregation of suspended matter in the central tube 3 to form aggregates heavier than water; then the neutralizing liquid and the formed aggregates are discharged from the bottom opening of the central tube 3, and the aggregates will continue to settle into the mud storage section 102 due to their heavier weight than water, and the clean water will rise and overflow into the annular drainage trough, thereby completing the solid-liquid separation. Finally, the thick slurry in the mud storage section 102 is discharged from the tank body 1 through the slurry discharge pipe 6 at the bottom of the tank body 1; the clean water is sent to the industrial clean water tank for standby through the clean water delivery pipe 8.

[0025] Furthermore, in a specific embodiment, the central tube 3 is made of a round barrel using a carbon steel plate, and the bottom is made into a trumpet shape, the purpose of which is to make the neutralized liquid in the central tube 3 flow out faster. Four supporting channel steels are evenly distributed on the outer wall of the central tube 3, the lower part of the channel steel is welded to the outer wall of the central tube 3, and the upper part of the channel steel is hung and welded on the flat steel frame 9 at the top of the settling section 101; the four ears in the lower part of the central tube 3 are placed on the central tube fixing frame 10.

[0026] Furthermore, in the present application, the aggregates are arsenic compounds generated by the reaction of arsenic-containing waste acid water and carbide slag. Both the neutralization liquid and the arsenic compounds are viscous and easily adhere to the tank wall, making it impossible to transport the thickened neutralization liquid. In particular, the sludge storage section 102 at the bottom of the tank 1 stores a large amount of settled sludge, which is very easy to be blocked. For this reason, in an improved solution of the present application, a stirring device is set in the tank 1, such as Figure 2 Shown is a structural cross-sectional view of the improved thickener of the present application.

[0027] likeFigure 2 As shown in Figure 2 , the stirring device includes a stirring main shaft 11, a stirring drive 12, a large stirring paddle 13, and a small stirring paddle 14; the stirring main shaft 11 is vertically installed in the center of the tank body 1, the stirring main shaft 11 extends upward through the central cylinder 3 to connect the stirring drive 12, and the stirring drive 12 is installed on the sealing air cover 2. The stirring main shaft 11 extends downward to the bottom of the tank body 1. The large stirring paddle 13 is arranged at the sludge storage section 102 of the stirring main shaft 11, and the small stirring paddle 14 is arranged at the bottom of the stirring main shaft 11. Preferably, the large stirring paddle 13 adopts a bracket-shaped blade, and the bracket-shaped blade has a scraping wall part 131 close to the inner wall of the sludge storage section 102. During the rotation of the stirring main shaft 11, the scraping wall part 131 can scrape the inner wall of the sludge storage section 102 and scrape off the adhered materials on it. Preferably, the small stirring paddle 14 adopts a marine blade, such as Figure 2 As shown in Figure 2 , the small stirring paddle 14 is located at the slurry discharge pipe 6 and is used to accelerate the discharge of materials.

[0028] Furthermore, for the convenience of repair, a cleaning manhole 15 is also provided on the opposite side of the slurry discharge pipe 6.

[0029] In a specific embodiment, the specifications (diameter * height) of the sedimentation section 101 are Φ8m * 4.7m; the sludge storage section 102 is conical, the upper end interface has the same size as the sedimentation section 101, which is Φ8m, the lower port size is Φ0.8m, the height of the sludge storage section 102 is 6.3m, and the cone angle is 60°; the material of the tank body 1 is Q235, the wall thickness of the tank body 1 is 16mm, and the capacity of the tank body 1 is 236m 3 ; A sealing air cover 2 with a diameter of φ8.1 * height of 0.6m made of 304 stainless steel is installed on the top of the tank body 1. Four exhaust holes are opened on the surface of the sealing air cover 2, and the four exhaust holes are introduced into the desulfurization system through the exhaust pipe 7. An electric regulating butterfly valve made of stainless steel with DN100 and PN0.6 is installed on the exhaust pipe 7. The specifications (diameter * height) of the central cylinder 3 are 2m * 3m, and the capacity is 9m 3 .

[0030] When implementing the thickening process using the thickener with the above specifications, the reference process conditions are as follows: the flow rate of the neutralization liquid is 50m 3 / h, the residence time in the neutralization liquid tank (i.e., the sedimentation time) is 4.72h, the sludge sedimentation and upward flow velocity is 0.00024m / s; the residence time in the central reaction cylinder is 20min, and the flow velocity in the central cylinder 3 is 0.003m / s; the sludge moisture content is 50%, and the sedimentation efficiency is 98%; the steam flow rate is 703m 3 / h.

[0031] It can be understood that the present utility model is described by means of some embodiments. Those skilled in the art will be aware that, without departing from the spirit and scope of the present utility model, various changes or equivalent substitutions can be made to these features and embodiments. Additionally, under the teaching of the present utility model, these features and embodiments can be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present utility model.

Claims

1. A thickener for neutralized liquid of arsenic acid-containing wastewater, characterized in that: It includes a tank body, a slurry discharge pipe is arranged at the bottom of the tank body, and a sealing gas cover is installed on the top of the tank body; a central tube is arranged inside the tank body, and the bottom of the central tube is open; a drainage structure is arranged on the inner wall of the tank body; a feed pipe is arranged on the tank body, one end of the discharge port of the feed pipe passes through the tank body wall and extends into the interior of the central tube, and one end of the feed port of the feed pipe is connected to a feeding pump outside the tank body; and an exhaust device is arranged on the sealing gas cover.

2. The arsenic acid-containing wastewater neutralization liquid thickener according to claim 1, characterized in that: The tank body consists of an upper cylindrical sedimentation section and a lower conical mud storage section.

3. The arsenic acid-containing wastewater neutralization liquid thickener according to claim 1, characterized in that: The sealing gas cover is provided with an exhaust hole, and the exhaust hole is introduced into the desulfurization system through an exhaust pipe.

4. The arsenic acid-containing wastewater neutralization liquid thickener according to claim 2, characterized in that: The drainage structure is an annular drainage groove arranged on the inner wall of the sedimentation section. The surface of the drainage groove located inside the tank body is provided with a water inlet hole, and the drainage groove is connected to a clean water delivery pipe.

5. The arsenic acid-containing wastewater neutralization liquid thickener according to claim 2, characterized in that: It also includes a stirring device, which includes a stirring shaft, a stirring drive, a large stirring paddle, and a small stirring paddle; the stirring shaft is vertically installed in the center of the tank body, the stirring shaft passes through the center tube upward to connect to the stirring drive, and the stirring drive is installed on the sealing air cover; the stirring shaft extends downward to the bottom of the tank body, the stirring shaft is located in the mud storage section and a large stirring paddle is set, and a small stirring paddle is set at the bottom of the stirring shaft.

6. The arsenic acid-containing wastewater neutralization liquid thickener according to claim 5, characterized in that: The large stirring paddle adopts a bracket-shaped blade, and the bracket-shaped blade has a scraping part close to the inner wall of the mud storage section. During the rotation of the stirring main shaft, the scraping part can scrape the inner wall of the mud storage section.

7. The arsenic acid-containing wastewater neutralization liquid thickener according to claim 5, characterized in that: The small stirring paddle adopts a marine paddle.

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