Phosphogypsum washing system

Abstract

A phosphogypsum washing system comprises a water scrubber, the water scrubber is communicated with a sedimentation tank through a slurry pipe, the water scrubber comprises a stirring pipe, pipe openings in the upper end and the lower end of the stirring pipe are sealed through sealing covers respectively, a speed reducing motor and a bearing seat are installed on the two sealing covers respectively, a hollow shaft is arranged in the stirring pipe, one end of the hollow shaft is fixedly connected with the speed reducing motor, and the other end of the hollow shaft is fixedly connected with the bearing seat. The other end of the hollow shaft penetrates through the bearing seat and then is connected to one end of a rotary joint, the other end of the rotary joint is communicated with a steam pipe, a plurality of stirring rods are fixedly connected to the two sides of the hollow shaft, a plurality of aeration heads are communicated with the hollow shaft, the upper end and the lower end of the stirring pipe are communicated with a discharging pipe and a feeding pipe respectively, and the discharging pipe is communicated with a slurry pipe. The ardealite alkali washing device is used for solving the problems that existing ardealite alkali washing cannot be continuous, the alkali washing efficiency is not high, and large-batch treatment cannot be achieved.

Description

Technical Field

[0001] The utility model relates to a phosphogypsum washing system. Background Art

[0002] Phosphogypsum is a byproduct of phosphate fertilizer production, which contains a large amount of water-soluble phosphorus. As an industrial byproduct that is stored in large quantities, phosphogypsum not only occupies a large amount of land, but also the leachate formed by rainwater leaching from phosphogypsum storage sites will seriously pollute the land and water environment. At present, my country's annual production of phosphogypsum is about 75 million tons, and the cumulative stockpile exceeds 600 million tons, which has posed a serious threat to the environment and ecosystem.

[0003] Before the utilization of phosphogypsum, since it contains a large amount of harmful impurities, it must be treated in a certain way before it can be fully utilized. A common treatment method is to perform alkali washing on the phosphogypsum. In the prior art, the washing of phosphogypsum is stirred and washed with water. For example, the patent "CN 210995568 U, a phosphogypsum washing device" uses a liftable stirring paddle to stir and wash the phosphogypsum. The disadvantage is that after the phosphogypsum is washed, the stirring paddle needs to be pulled out, and then the phosphogypsum needs to be allowed to stand and stratify, and then the phosphogypsum and water are separated. It can be seen that the entire washing process cannot be continuous and the alkali washing efficiency is not high. Utility Model Content

[0004] The utility model aims to provide a phosphogypsum washing system, which is used to solve the problems that the existing phosphogypsum alkali washing cannot be continuous and the alkali washing efficiency is low.

[0005] In order to solve the above problems, the technical solution of the utility model is:

[0006] A phosphogypsum washing system comprises a water washer, which is connected to a sedimentation tank through a mud pipe. The water washer comprises a stirring tube, and the upper and lower ends of the stirring tube are sealed by sealing covers respectively. A reduction motor and a bearing seat are respectively installed on the two sealing covers. A hollow shaft is provided in the stirring tube, one end of the hollow shaft is fixedly connected to the reduction motor, and the other end of the hollow shaft passes through the bearing seat and is connected to one end of a rotary joint. The other end of the rotary joint is connected to a steam pipe, and a plurality of stirring rods are fixedly connected to both sides of the hollow shaft, and a plurality of aeration heads are connected to the hollow shaft. A discharge pipe and a feed pipe are respectively connected to the upper and lower ends of the stirring tube, and the discharge pipe is connected to the mud pipe.

[0007] Scraping strips are arranged on both sides of the aerial shaft, the scraping strips are fixedly connected to the stirring rods, and rubber scrapers are fixedly connected to the scraping strips, and the rubber scrapers are pressed against the wall of the stirring tube.

[0008] A one-way valve is installed on the steam pipe and is connected with a water pipe, and a valve is installed on the water pipe.

[0009] The mud pipe is connected with a debubble tank, a debubble device is installed on the debubble tank, and a mud pump is installed on the pipeline connecting the debubble tank to the sedimentation tank.

[0010] The beneficial effects of the utility model are as follows: the phosphogypsum slurry can be continuously stirred and alkali-washed through the water washer, and the phosphogypsum slurry is continuously steam-heated and bubbled during the alkali washing process to improve the alkali washing effect, and the phosphogypsum slurry after alkali washing is sent to the sedimentation tank for sedimentation, thereby realizing the "flow-through" continuous alkali washing of the phosphogypsum from bottom to top, so that the entire alkali washing process does not need to be paused, thereby improving the alkali washing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The utility model is further described below in conjunction with the accompanying drawings:

[0012] Figure 1 It is a structural schematic diagram of the utility model.

[0013] Figure 2 This is a schematic cross-sectional structure diagram of a water scrubber according to the utility model.

[0014] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure at AA in the middle.

[0015] In the figure: sedimentation tank 1, mud pump 2, defoaming tank 3, defoamer 4, mud pipe 5, water scrubber 6, reduction motor 601, aeration head 602, hollow shaft 603, stirring rod 604, stirring pipe 605, feed pipe 606, bearing seat 607, rotary joint 608, one-way valve 609, steam pipe 610, tap water pipe 611, scraper 612, rubber scraper 613, discharge pipe 614. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] like Figures 1 to 3As shown, a phosphogypsum washing system includes a water washer 6, which is connected to a sedimentation tank 1 through a mud pipe 5. The water washer 6 includes a stirring tube 605 made of stainless steel. The upper and lower ends of the stirring tube 605 are sealed by sealing covers. A reduction motor 601 and a bearing seat 607 are respectively installed on the two sealing covers. A hollow shaft 603 is provided in the stirring tube 605. One end of the hollow shaft 603 is fixedly connected to the reduction motor 601, and the other end of the hollow shaft 603 passes through the bearing seat 607 and is connected to one end of a rotary joint 608. A shaft seal is provided between the hollow shaft 603 and the bearing seat 607. The other end of the rotary joint 608 is connected to the steam pipe 610. The rotary joint 608 can allow the steam pipe 610 to continuously inject steam into the hollow shaft 603 without affecting the rotation of the hollow shaft 603. A plurality of stirring rods 604 are fixedly connected to both sides of the hollow shaft 603. A plurality of aeration heads 602 are connected to the hollow shaft 603. A discharge pipe 614 and a feed pipe 606 are respectively connected to the upper and lower ends of the stirring pipe 605. The discharge pipe 614 is connected to the mud pipe 5.

[0018] During the implementation of the utility model, the feed pipe 606 pumps the phosphogypsum and alkali solution mixture into the stirring pipe 605, and the mixture entering the stirring pipe 605 is stirred by the stirring rod 604. During the stirring process, steam is sent into the hollow shaft 603, and the steam is sprayed from the aeration head 602 to bubble, heat and stir the mixture for alkali washing. The mud after alkali washing flows into the sedimentation tank 1 through the mud pipe 5 for sedimentation. The phosphogypsum mud precipitated from the sedimentation tank 1 is continuously sent to the cloth belt filter press for dehydration, and the precipitated clean water is sent to the water storage tank for conditioning. Since the phosphogypsum is heated and stirred by steam, the viscosity of the mud can be reduced, the mass transfer effect can be improved, and the washing effect of the phosphogypsum can be greatly improved.

[0019] Scraping strips 612 are provided on both sides of the aerial shaft, and the scraping strips 612 are fixedly connected to the stirring rod 604. A rubber scraper 613 is fixedly connected to the scraping strips 612, and the rubber scraper 613 abuts against the wall of the stirring tube 605. The stirring tube 605 is cleaned by the rubber scraper 613 to prevent the "sticking to the wall" phenomenon.

[0020] A one-way valve 609 and a tap water pipe 611 are installed on the steam pipe 610, and a valve is installed on the tap water pipe 611. When phosphogypsum is alkali-washed, since steam is continuously ejected from the aeration head 602, the phosphogypsum cannot enter the air holes on the aeration head 602, and the aeration head 602 will not be blocked. When the entire phosphogypsum washing system is shut down, the steam stops being fed, and the phosphogypsum remaining in the stirring tube 605 will stick to the aeration head 602, which is easy to cause blockage. Therefore, a tap water pipe 611 is set. Before and after the phosphogypsum washing system is shut down, the tap water pipe 611 is opened to allow tap water to flow from the aeration head 602 into the stirring tube 605, continuously flush the phosphogypsum in the stirring tube 605, and discharge the residual phosphogypsum in the stirring tube 605 to prevent the aeration head 602 from being blocked.

[0021] The mud pipe 5 is connected to the defoaming tank 3, on which a defoamer 4 is installed, and a mud pump 2 is installed on the pipeline connecting the defoaming tank 3 to the sedimentation tank 1. Physical defoaming is performed on the discharged phosphogypsum slurry to prevent the phosphogypsum from affecting the sedimentation of the sedimentation tank 1.

[0022] The contents described in the embodiments of this specification are merely an enumeration of the implementation forms of the utility model concept. The protection scope of the utility model should not be deemed to be limited to the specific forms described in the embodiments. The protection scope of the utility model also extends to equivalent technical means that can be thought of by those skilled in the art based on the concept of the utility model.

Claims

1. A phosphogypsum washing system, characterized in that: The invention comprises a water washer (6), wherein the water washer (6) is connected to a sedimentation tank (1) via a mud pipe (5), wherein the water washer (6) comprises a stirring tube (605), wherein the upper and lower ends of the stirring tube (605) are sealed via sealing covers, wherein a reduction motor (601) and a bearing seat (607) are respectively mounted on the two sealing covers, wherein a hollow shaft (603) is arranged in the stirring tube (605), wherein one end of the hollow shaft (603) is fixedly connected to the reduction motor (601), and the hollow shaft (603) is The other end passes through the bearing seat (607) and is connected to one end of the rotary joint (608). The other end of the rotary joint (608) is connected to the steam pipe (610). A plurality of stirring rods (604) are fixedly connected to both sides of the hollow shaft (603). A plurality of aeration heads (602) are connected to the hollow shaft (603). A discharge pipe (614) and a feed pipe (606) are respectively connected to the upper and lower ends of the stirring pipe (605). The discharge pipe (614) is connected to the mud pipe (5).

2. A phosphogypsum washing system according to claim 1, characterized in that: Scraping strips (612) are provided on both sides of the aerial shaft. The scraping strips (612) are fixedly connected to the stirring rod (604). A rubber scraper (613) is fixedly connected to the scraping strip (612). The rubber scraper (613) abuts against the wall of the stirring tube (605).

3. A phosphogypsum washing system according to claim 1 or 2, characterized in that: A one-way valve (609) is installed on the steam pipe (610) and is connected to a water pipe (611), and a valve is installed on the water pipe (611).

4. A phosphogypsum washing system according to claim 1 or 2, characterized in that: The mud pipe (5) is connected to a debubble tank (3), a debubble device (4) is installed on the debubble tank (3), and a mud pump (2) is installed on the pipeline connecting the debubble tank (3) to the sedimentation tank (1).

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