Phosphogypsum desulfurization calcination treatment system

Abstract

The utility model discloses an ardealite desulfurization calcining treatment system, which comprises a desulfurization tower and a dehydration device rotatably installed inside the desulfurization tower, a motor located at the rear end of the dehydration device is fixedly installed on one side inside the desulfurization tower, and a hinge is installed at the output end of the motor and the outer side of a rotating rod on one side of the dehydration device in a sleeved mode. A suction fan is fixedly mounted on one side of the outer side of the desulfurization tower, and an air suction pipe fixed on one side of the desulfurization tower is fixedly mounted at the input end of the suction fan. According to the water-containing ardealite dewatering device, the motor and the hinge are matched to drive the dewatering device to rotate, so that water-containing ardealite rolls continuously after being added into the dewatering device, the water-containing ardealite is heated more uniformly, the dewatering efficiency is improved, meanwhile, the inner wall of the dewatering device is scraped off through the scraper, and the dewatering efficiency is improved. And the condition that subsequent phosphogypsum calcination is influenced due to blockage caused by adhesion of the water-containing phosphogypsum to the inner wall of the dehydration equipment due to viscosity after the water-containing phosphogypsum is added into the dehydration equipment is avoided.

Description

Technical Field

[0001] This utility model relates to the field of phosphogypsum desulfurization technology, and in particular to a phosphogypsum desulfurization calcination treatment system. Background Technology

[0002] Phosphogypsum is a byproduct of wet-process phosphoric acid production. Desulfurization and calcination of phosphogypsum typically involves first calcining and dehydrating it to convert it into anhydrous gypsum. Further calcination produces a semi-finished product suitable for cement production or other industrial applications. Simultaneously, the gases generated during calcination are collected to prepare sulfuric acid. Currently, phosphogypsum undergoes low-temperature dehydration before desulfurization and calcination. This involves low-temperature drying and high-temperature grinding to remove natural water and water of crystallization, resulting in anhydrous gypsum. Then, high-temperature calcination is performed using specialized equipment to decompose, reduce, and remove impurities such as fluorine and chlorine, as well as water of crystallization, yielding dehydrated phosphogypsum. This achieves the harmless treatment and resource utilization of phosphogypsum.

[0003] Chinese Patent CN213865977U discloses a phosphogypsum desulfurization and calcination system, comprising a low-temperature dehydration system, a high-temperature calcination system, and an acid production system. The low-temperature dehydration system includes a dryer, a drying mill, and a tubular furnace. The high-temperature calcination system includes a preheating device, a rotary kiln, and a cooler. The system removes natural water and crystal water from the phosphogypsum through low-temperature drying and high-temperature grinding to obtain anhydrous gypsum. The anhydrous gypsum is then calcined at high temperatures and cooled by air before being sent to a cement production line as a cement raw material. The gas generated during calcination is collected and sent to the acid production system to prepare sulfuric acid. However, this phosphogypsum desulfurization and calcination system has the following drawbacks: Before dehydration, the phosphogypsum is quite viscous. When added to the dehydration equipment for dehydration and calcination, the phosphogypsum easily adheres to the inner wall of the equipment, leading to uneven heating and reduced dehydration efficiency. Furthermore, phosphogypsum adhering to the inner wall of the equipment for a long time may form clumps, clogging the pipes and affecting subsequent dehydration and calcination efficiency. Utility Model Content

[0004] This invention addresses the aforementioned technical problems existing in the current phosphogypsum desulfurization and calcination treatment system by providing a phosphogypsum desulfurization and calcination treatment system with an ingenious structure that is less prone to clogging of the dehydration equipment.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model discloses a phosphogypsum desulfurization and calcination treatment system, comprising a desulfurization tower and a dehydration device rotatably installed inside the desulfurization tower. A motor located at the rear end of the dehydration device is fixedly installed on one side of the desulfurization tower. A hinge is fitted onto the outer side of a rotating rod on one side of the dehydration device at the output end of the motor. A suction fan is fixedly installed on one side of the desulfurization tower at the input end of the suction fan, with a suction pipe fixed to one side of the desulfurization tower. The rotating rod on one side of the dehydration device extends into the suction pipe. A gas delivery pipe extending through and into the desulfurization tower is fixedly installed at the output end of the suction fan. A side support bucket fixedly connected to the inner wall of the desulfurization tower is fitted onto the other side of the dehydration device. A cross-shaped fixing rod is fixedly installed on the inner wall of the side support bucket. Connecting rods rotatably connected to the inner wall of the dehydration device are evenly fixedly installed on one side of the cross-shaped fixing rod. A scraper is fixedly installed on the outer side of the connecting rod. A gas guide hole is opened through the rotating rod on one side of the dehydration device.

[0007] Preferably, a first inlet is provided through the bottom of the front end of the desulfurization tower, and a first sealing cap is rotatably installed at the front end of the first inlet.

[0008] Preferably, a water inlet is fixedly installed at the top of the desulfurization tower, and an oxygen supply pipe is fixedly installed on the other side of the desulfurization tower.

[0009] Preferably, a second inlet is fixedly installed through the top of the side support hopper through the desulfurization tower, a third sealing cover is rotatably installed on the top of the second inlet, a discharge pipe is fixedly installed through the bottom of the desulfurization tower, and a valve is fixedly installed inside the discharge pipe.

[0010] Preferably, a partition plate located at the top of the dehydration equipment is fixedly installed inside the desulfurization tower, and an acid discharge pipe extending through the desulfurization tower to the rear end is fixedly connected to the bottom of the partition plate. An electronic valve is fixedly installed inside the acid discharge pipe.

[0011] Preferably, a discharge trough is provided at the bottom of one side of the desulfurization tower, a sealing plate located at the bottom of one side of the dewatering equipment is rotatably installed on the top of the discharge trough, a second sealing cover is rotatably installed at the bottom of one side of the dewatering equipment, and the inner wall of the dewatering equipment is inclined to one side.

[0012] Therefore, this utility model has the following beneficial effects: by using a motor and hinge to drive the dehydration equipment to rotate, the hydrated phosphogypsum is continuously tumbled after being added to the dehydration equipment, which makes the hydrated phosphogypsum heat more evenly and improves the dehydration efficiency. At the same time, the scraper scrapes the inner wall of the dehydration equipment, which improves the tumbling efficiency of the hydrated phosphogypsum inside the dehydration equipment and avoids the situation where the hydrated phosphogypsum adheres to the inner wall of the dehydration equipment due to its viscosity after being added to the dehydration equipment, causing blockage and affecting the subsequent calcination of phosphogypsum. Attached Figure Description

[0013] Figure 1 This is a front view structural diagram of the present invention.

[0014] Figure 2 This is a frontal cross-sectional view of the present invention.

[0015] Figure 3 This is a side view sectional structural diagram of the desulfurization tower of this utility model.

[0016] Figure 4 This is a top view sectional view of the unfolded structure of this utility model.

[0017] Figure 5 This is a front view cross-sectional structural diagram of the dehydration equipment of this utility model.

[0018] In the diagram: 1. Desulfurization tower; 101. Motor; 102. Hinge; 103. Fan; 104. Suction pipe; 105. Gas delivery pipe; 106. First feed inlet; 107. First sealing cover; 108. Water inlet; 109. Oxygen delivery pipe; 2. Dehydration equipment; 201. Side support hopper; 202. Cross fixing rod; 203. Connecting rod; 204. Scraper; 205. Air guide hole; 206. Second sealing cover; 207. Second feed inlet; 208. Third sealing cover; 3. Discharge pipe; 301. Valve; 4. Baffle plate; 401. Acid discharge pipe; 402. Electronic valve; 5. Discharge trough; 501. Sealing plate. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0020] Please see Figures 1-5A phosphogypsum desulfurization and calcination treatment system includes a desulfurization tower 1 and a dehydration device 2 rotatably installed inside the desulfurization tower 1. A motor 101 located at the rear end of the dehydration device 2 is fixedly installed on one side inside the desulfurization tower 1. A hinge 102 is sleeved on the outer side of a rotating rod on one side of the dehydration device 2 at the output end of the motor 101. A suction fan 103 is fixedly installed on one side outside the desulfurization tower 1. An air suction pipe 104 fixed to one side of the desulfurization tower 1 is fixedly installed at the input end of the suction fan 103, and the rotating rod on one side of the dehydration device 2 extends to the air suction pipe 104. Inside, the output end of the suction fan 103 is fixedly installed with a gas supply pipe 105 that extends through the inside of the desulfurization tower 1; on the other side of the dewatering equipment 2, a side support bucket 201 is sleeved and fixedly connected to the inner wall of the desulfurization tower 1. A cross fixing rod 202 is fixedly installed on the inner wall of the side support bucket 201. A connecting rod 203 that is rotatably connected to the inner wall of one side of the dewatering equipment 2 is evenly fixedly installed on one side of the cross fixing rod 202. A scraper 204 is fixedly installed on the outer side of the connecting rod 203. A guide hole 205 is opened through the rotating rod on one side of the dewatering equipment 2. With the above-described structural configuration, the phosphogypsum desulfurization and calcination treatment system adds hydrated phosphogypsum into the dehydration equipment 2. The motor 101 and hinge 102 then drive the dehydration equipment 2 to rotate inside the desulfurization tower 1. Since one end of the connecting rod 203 is rotatably connected to the dehydration equipment 2, the scraper 204 scrapes off a small amount of phosphogypsum adhering to the inner wall of the dehydration equipment 2 while the phosphogypsum tumbles inside the equipment. This makes the phosphogypsum heat more evenly distributed during calcination and dehydration, thereby improving the dehydration efficiency. After the phosphogypsum dehydration is complete, the calcination temperature is increased, so that the sulfur gas produced during the calcination process is mainly sulfur dioxide. The suction force of the blower 103 draws the sulfur gas generated inside the dehydration equipment 2 through the suction pipe 104 and the gas delivery pipe 105 into the acid-generating mechanism inside the desulfurization tower 1, further improving the calcination and desulfurization efficiency of the phosphogypsum.

[0021] Furthermore, a first feed inlet 106 is provided through the bottom of the front end of the desulfurization tower 1, and a first sealing cover 107 is rotatably installed at the front end of the first feed inlet 106. Workers add the calcining material, mainly carbon, into the calcination chamber at the bottom of the desulfurization tower 1 through the first feed inlet 106 for calcination and dehydration. The closure of the first sealing cover 107 prevents heat loss during the calcination process, thereby improving the dehydration and desulfurization efficiency.

[0022] Furthermore, a water inlet 108 is fixedly installed through the top of the desulfurization tower 1, and an oxygen supply pipe 109 is fixedly installed through the other side of the desulfurization tower 1. Water is conveniently added to the top of the partition 4 inside the desulfurization tower 1 through the water inlet 108. One end of both the gas supply pipe 105 and the oxygen supply pipe 109 extends into the water, allowing the sulfur gas and oxygen introduced by the gas supply pipe 105 and the oxygen supply pipe 109 to fully dissolve in the water and react to generate sulfuric acid, thereby removing the sulfur gas and preventing environmental pollution. The generated sulfuric acid solution can also be used in other industries.

[0023] Furthermore, a second feed inlet 207 is fixedly installed through the top of the side support hopper 201, penetrating the desulfurization tower 1. A third sealing cover 208 is rotatably installed on the top of the second feed inlet 207. A discharge pipe 3 is fixedly installed through the bottom of the desulfurization tower 1, and a valve 301 is fixedly installed inside the discharge pipe 3. The second feed inlet 207 facilitates the addition of water-containing phosphogypsum into the dewatering equipment 2. The second feed inlet 207 is then closed to seal its top, preventing sulfur gas generated during phosphogypsum desulfurization from being released into the external environment and causing pollution. The valve 301 is opened to allow calcination waste in the calcination chamber inside the desulfurization tower 1 to be discharged through the discharge pipe 3, preventing residue from affecting calcination after the addition of calcination materials.

[0024] Furthermore, a baffle 4 is fixedly installed inside the desulfurization tower 1 at the top of the dehydration equipment 2. A discharge pipe 401, extending from the bottom of the baffle 4 through the desulfurization tower 1 to the rear end, is fixedly connected to the baffle 4. An electronic valve 402 is fixedly installed inside the discharge pipe 401. When the water at the top of the baffle 4 reacts with sulfur gas and oxygen to produce sulfuric acid, the electronic valve 402 opens, allowing the sulfuric acid to be discharged through the discharge pipe 401 into a collection device for convenient industrial reuse.

[0025] Furthermore, a discharge trough 5 is provided at the bottom of one side of the desulfurization tower 1. A sealing plate 501 located at the bottom of one side of the dewatering device 2 is rotatably installed on the top of the discharge trough 5. A second sealing cover 206 is rotatably installed at the bottom of one side of the dewatering device 2, and the inner wall of the dewatering device 2 is inclined to one side. When the phosphogypsum desulfurization is completed, the motor 101 drives the dewatering device 2 to rotate through the hinge 102, so that the opening on one side of the dewatering device 2 is located at the bottom. Then, the sealing plate 501 and the second sealing cover 206 are installed in sequence. Since the inner wall of the dewatering device 2 is inclined to one side, the phosphogypsum slides to the opening on one side during rotation and is discharged through the outlet into the collection device placed in advance inside the discharge trough 5 for collection.

[0026] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. A phosphogypsum desulfurization and calcination treatment system, comprising a desulfurization tower (1) and a dehydration device (2) rotatably installed inside the desulfurization tower (1), characterized in that, A motor (101) located at the rear end of the dehydration equipment (2) is fixedly installed on one side inside the desulfurization tower (1). A hinge (102) is sleeved on the outer side of the rotating rod on one side of the dehydration equipment (2). A suction fan (103) is fixedly installed on one side outside the desulfurization tower (1). A suction pipe (104) fixed to one side of the desulfurization tower (1) is fixedly installed at the input end of the suction fan (103). The rotating rod on one side of the dehydration equipment (2) extends into the suction pipe (104). A through-hole is fixedly installed at the output end of the suction fan (103). A gas transmission pipe (105) extends into the desulfurization tower (1); a side support bucket (201) is sleeved on the other side of the dehydration equipment (2) and fixedly connected to the inner wall of the desulfurization tower (1). A cross fixing rod (202) is fixedly installed on the inner wall of the side support bucket (201). A connecting rod (203) is evenly fixedly installed on one side of the cross fixing rod (202) and rotatably connected to the inner wall of one side of the dehydration equipment (2). A scraper (204) is fixedly installed on the outer side of the connecting rod (203). A gas guide hole (205) is opened through the rotating rod on one side of the dehydration equipment (2).

2. The phosphogypsum desulfurization and calcination treatment system according to claim 1, characterized in that, The desulfurization tower (1) has a first inlet (106) at the bottom of its front end, and a first sealing cap (107) is rotatably installed at the front end of the first inlet (106).

3. The phosphogypsum desulfurization and calcination treatment system according to claim 1, characterized in that, A water inlet (108) is fixedly installed on the top of the desulfurization tower (1), and an oxygen supply pipe (109) is fixedly installed on the other side of the desulfurization tower (1).

4. The phosphogypsum desulfurization and calcination treatment system according to claim 1, characterized in that, The top of the side support bucket (201) is fixedly installed through the desulfurization tower (1) with a second feed inlet (207). The top of the second feed inlet (207) is rotatably installed with a third sealing cover (208). The bottom of the desulfurization tower (1) is fixedly installed with a discharge pipe (3). The inside of the discharge pipe (3) is fixedly installed with a valve (301).

5. The phosphogypsum desulfurization and calcination treatment system according to claim 1, characterized in that, The desulfurization tower (1) has a partition (4) fixedly installed inside the top of the dehydration equipment (2). The bottom of the partition (4) is connected to an acid discharge pipe (401) that extends through the desulfurization tower (1) to the rear end. An electronic valve (402) is fixedly installed inside the acid discharge pipe (401).

6. The phosphogypsum desulfurization and calcination treatment system according to claim 1, characterized in that, The bottom of one side of the desulfurization tower (1) is provided with a discharge trough (5), and a sealing plate (501) located at the bottom of one side of the dewatering device (2) is rotatably installed on the top of the discharge trough (5). A second sealing cover (206) is rotatably installed on the bottom of one side of the dewatering device (2), and the inner wall of the dewatering device (2) is inclined to one side.

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