CN215586768U

CN215586768U - Phosphogypsum washing system

Info

Publication number: CN215586768U
Application number: CN202122443519.5U
Authority: CN
Inventors: 马培根; 魏东; 雷婷; 曾建; 陈浩; 刘文兴
Original assignee: YUNNAN XINLONG MINERALS FEED CO Ltd
Current assignee: YUNNAN XINLONG MINERALS FEED CO Ltd
Priority date: 2021-10-11
Filing date: 2021-10-11
Publication date: 2022-01-21
Anticipated expiration: 2031-10-11

Abstract

The utility model discloses an ardealite washing system, which relates to the field of ardealite production and processing equipment and comprises a stirring tank and a heat exchanger, wherein the stirring tank is provided with a slurry outlet, a supernatant outlet and a supernatant circulation inlet, the supernatant outlet and the supernatant circulation inlet are respectively positioned at the upper end and the lower end of the stirring tank, the supernatant outlet is connected with the inlet end of the heat exchanger, and the supernatant circulation inlet is connected with the outlet end of the heat exchanger. The supernatant in the stirring tank is fed into the heat exchanger for heating, and is fed into the stirring tank from the supernatant circulation inlet after being heated, so that the slurry deposited at the bottom of the stirring tank is dispersed, the phosphogypsum is heated by the heat exchanger in the washing process to reduce the viscosity of the slurry, the mass transfer effect is greatly improved, and the washing effect of the phosphogypsum is greatly improved.

Description

Phosphogypsum washing system

Technical Field

The utility model relates to the field of phosphogypsum production and processing equipment, in particular to a phosphogypsum washing system.

Background

Phosphogypsum refers to solid waste residue generated when phosphorite is treated by sulfuric acid in phosphoric acid production, and comprises calcium sulfate as main component, small amount of phosphorite, phosphoric acid, calcium fluoride, sodium fluoride, metal oxides of Si, Mg, Al, Fe and the like, and trace radioactive elements. At present, the production of phosphoric acid (calculated as P2O 5) per year in China is about 500 million tons/year, which leads to the production of about 2500 million tons of phosphogypsum. Due to the limitation of technical level, the actual utilization rate of the phosphogypsum in China is only about 10 percent at present, and a large amount of phosphogypsum cannot be effectively treated actually. The stockpiling of the phosphogypsum not only occupies a large amount of land and consumes a large amount of capital, but also can dissolve P in the phosphogypsum along with the passage of time₂O₅And fluorine and other impurities are leached out along with rainwater to generate acidic wastewater, so that not only is soil, a water system and the atmosphere polluted, but also serious ecological hazard is caused, a large amount of phosphorus is lost, and the utilization rate of phosphorus resources is reduced.

At present, phosphogypsum can be used as a substitute of gypsum to prepare gypsum mortar, and the treatment modes mainly comprise a flotation method, a pyrolysis method, a classification method, a water washing method, a neutralization method and the like, wherein the water washing method is the most common and is suitable for batch treatment of the phosphogypsum, but because the phosphogypsum has high viscosity and serious agglomeration, the common washing mode is difficult to stir and disperse the phosphogypsum, has poor heat transfer effect, is difficult to heat and wash, and is difficult to completely elute the phosphorus in the phosphogypsum.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a phosphogypsum washing system which effectively solves the problems of poor heat transfer effect and poor washing effect of viscous materials.

In order to realize the purpose of the utility model, the technical scheme is as follows: the phosphogypsum washing system comprises a stirring tank and a heat exchanger, wherein a slurry outlet, a supernatant outlet and a supernatant circulating inlet are arranged on the stirring tank, the supernatant outlet and the supernatant circulating inlet are respectively positioned at the upper end and the lower end of the stirring tank, the supernatant outlet is connected with the inlet end of the heat exchanger, and the supernatant circulating inlet is connected with the outlet end of the heat exchanger.

Furthermore, a spiral feeder is also arranged at the upper end of the stirring paddle.

Furthermore, a blanking plate is further installed in the stirring tank, and the extending end of the blanking plate inclines towards the spiral blanking device.

Furthermore, the blanking plate is semicircular, and a first notch avoiding the spiral blanking device is formed in the blanking plate.

Furthermore, a water inlet is also arranged on the stirring tank and is positioned above the blanking plate.

Furthermore, a clarifying plate is also arranged in the stirring tank, and corresponds to the supernatant circulating inlet.

Furthermore, the clarification plate is semicircular, a second notch for avoiding the spiral feeder is formed in the clarification plate, and a sealing plate is connected between the extension end of the clarification plate and the feeding plate.

Further, the extending end of the clarifying plate is inclined upwards.

Further, the lowest height of the clarifying plate is not less than the highest height of the blanking plate.

Furthermore, a baffle plate is further installed on the inner wall of the stirring tank and is located below the blanking plate.

Furthermore, the baffle plates are multiple, and the baffle plates extend towards the center of the stirring tank.

Furthermore, the central axis of the supernatant liquid circulating inlet is tangent to the bottom of the stirring tank.

Furthermore, a driving motor for driving the stirring paddle to rotate is supported at the top of the stirring tank.

Further, a slurry pump is further installed between the supernatant outlet and the inlet end of the heat exchanger.

The beneficial effect of the utility model is that,

the supernatant in the stirring tank is fed into the heat exchanger for heating, and is fed into the stirring tank from the supernatant circulation inlet after being heated, so that the slurry deposited at the bottom of the stirring tank is dispersed, the phosphogypsum is heated by the heat exchanger in the washing process to reduce the viscosity of the slurry, the mass transfer effect is greatly improved, and the washing effect of the phosphogypsum is greatly improved.

Drawings

Figure 1 is a schematic diagram of the structure of a phosphogypsum washing system provided by the present invention;

FIG. 2 is a top view of the blanking plate and the clarifying plate of FIG. 1.

Reference numbers and corresponding part names in the drawings:

1. the device comprises a stirring tank, 2, a heat exchanger, 3, a stirring paddle, 4, a water inlet, 5, a slurry outlet, 6, a supernatant outlet, 7, a supernatant circulating inlet, 8, a spiral feeder, 9, a feeding plate, 10, a clarifying plate, 11, a first notch, 12, a baffle plate, 13, a driving motor, 14, a slurry pump, 15 and a second notch.

Detailed Description

The present invention will be described in further detail below with reference to specific embodiments and with reference to the attached drawings.

As shown in fig. 1 and 2, the phosphogypsum washing system provided by the utility model comprises a stirring tank 1 and a heat exchanger 2, wherein the stirring tank 1 is in a tank shape, the stirring tank 1 is mainly used for washing phosphogypsum, and the heat exchanger 2 can directly adopt the existing shell and tube heat exchanger 2; the stirring tank 1 is provided with a slurry outlet, a supernatant outlet 6 and a supernatant circulating inlet 7, the slurry outlet 5 is positioned at the upper end of the stirring tank 1, the slurry outlet 5 is used for sending out the materials after the phosphogypsum is washed, the supernatant outlet 6 is positioned at the upper end of the stirring tank 1, the supernatant outlet 6 is used for sending out the supernatant generated in the washing process of the phosphogypsum, the supernatant circulating inlet 7 is positioned at the bottom of the stirring tank, the supernatant circulating inlet 7 is used for sending the slurry sent out through the supernatant outlet 6 into the stirring tank 1, and the supernatant outlet 6 is connected with the inlet end of the heat exchanger 2, the supernatant circulation inlet 7 is connected with the outlet end of the heat exchanger 2, the supernatant liquid sent out through the supernatant liquid outlet 6 enters the heat exchanger 2 for heat exchange, after the heat exchange, the heated supernatant is newly fed into the agitation tank 1, and the slurry in the agitation tank 1 is washed.

When the phosphogypsum needs to be washed, the phosphogypsum and water are fed into the stirring tank 1, the stirring paddle 3 is started to rotate at the same time, the phosphogypsum and the water are stirred and mixed by the stirring paddle 3, the phosphogypsum is always positioned at the bottom of the stirring tank 1 in the stirring process, the supernatant in the stirring tank 1 enters the heat exchanger 2 through the supernatant outlet 6 along with the gradual rise of the liquid level in the stirring tank 1, the supernatant exchanges heat while passing through the heat exchanger 2, and newly enters the bottom of the stirring tank 1 after the heat exchange, slurry deposited at the bottom of the stirring tank 1 is dispersed, the slurry is continuously washed with the stirring of the stirring paddle 3, so that the washing is continuously and repeatedly carried out, and after the washing is finished, the material is sent out from the slurry outlet 5.

The supernatant in the stirring tank 1 is fed into the heat exchanger 2 for heating, and is fed into the stirring tank 1 through the supernatant circulating inlet 7 after being heated, so that the slurry deposited at the bottom of the stirring tank 1 is dispersed, the phosphogypsum is heated by the heat exchanger in the washing process to reduce the viscosity of the slurry, the mass transfer effect is greatly improved, and the washing effect of the phosphogypsum is greatly improved.

In some embodiments, a spiral feeder 8 is further installed at the upper end of the stirring paddle 3, when the stirring paddle 3 rotates, the spiral feeder 8 on the stirring paddle 3 rotates synchronously, at this time, the phosphogypsum which needs to be fed into the stirring tank 1 is firstly fed onto the spiral feeder 8, and the phosphogypsum falling on the spiral feeder 8 is scattered through the rotation of the spiral feeder 8, so that the phosphogypsum falling in the stirring tank 1 is dispersed, and the washing effect of the phosphogypsum in the stirring tank 1 is greatly improved.

In some embodiments, a blanking plate 9 is further installed in the stirring tank 1, the blanking plate 9 is fixedly installed on the wall of the stirring tank 1, the extending end of the blanking plate 9 is inclined downward, and the extending end of the blanking plate 9 is butted with the spiral blanking device 8, so that before the phosphogypsum is added into the stirring tank 1, the phosphogypsum firstly falls on the blanking plate 9, and the phosphogypsum is flushed onto the blanking plate 9 while falling on the blanking plate 9, so that the phosphogypsum is moved to the spiral blanking device 8, the phosphogypsum is effectively prevented from being adhered to the blanking plate 9, and finally the phosphogypsum directly falls on the spiral blanking device 8 and is scattered through the rotation of the spiral blanking device 8. Here, the extending end of the blanking plate 9 is the end of the blanking plate 9 far away from the wall of the stirring tank 1, and the downward inclination angle of the blanking plate 9 can be adjusted according to the actual use condition.

In some embodiments, the blanking plate 9 is semicircular, so that the attachment range of the blanking plate 9 and the wall of the stirring tank 1 is wider, the installation of the blanking plate 9 is more convenient, and the installation of the blanking plate 9 is firmer; meanwhile, the first notch 11 avoiding the spiral feeder 8 is formed in the feeding plate 9, so that the feeding plate 9 can be prevented from colliding with the spiral feeder 8, the spiral feeder 8 is surrounded by the feeding plate 9, the phosphogypsum is easier to assemble on the spiral feeder 8, and the scattering effect of the phosphogypsum is better.

In some embodiments, the stirring tank 1 is further provided with a water inlet 4, and the water inlet 4 is positioned above the feeding plate 9, so that a water source conveying pipeline can be directly connected to the water inlet 4 when the stirring tank is used, the water feeding and the phosphogypsum feeding are separately arranged, the water feeding is more convenient, the fed water can directly impact the feeding plate 9, and the phosphogypsum added on the feeding plate 9 enters the spiral feeding device 8.

In some embodiments, a clarifying plate 10 is further installed in the stirring tank 1, the clarifying plate 10 is of a mesh plate structure, the clarifying plate 10 corresponds to the supernatant circulation inlet 7, and the clarifying plate 10 is mainly used for filtering slurry in the stirring tank 1, so that no slurry precipitate is ensured in supernatant entering the supernatant outlet 6, and blockage caused by deposition of slurry in the supernatant in the heat exchanger 2 and a pipeline for conveying the supernatant is effectively avoided.

In some embodiments, the clear plate 10 is semicircular, the clear plate 10 has a second notch 15 that is offset from the spiral discharger 8, the first notch 11 and the second notch 15 together form a circle, and a sealing plate is connected between the extending end of the clarifying plate 10 and the blanking plate 9, and the clarifying plate 10, the sealing plate and the blanking plate 9 are matched together to divide the interior of the stirring tank 1 into an upper cavity and a lower cavity, after the sealing plate is connected with the clarifying plate 10 and the blanking plate 9, the sealing plate is tile-shaped corresponding to the first gap 11 and the second gap 15, the spiral blanking device 8 corresponds to the middle part of the sealing plate, so that the phosphogypsum can be prevented from splashing everywhere when the spiral blanking device 8 is used for blanking, when the phosphogypsum moves along the blanking plate 9, the sealing plate can intercept the phosphogypsum, so that the phosphogypsum moving along the blanking plate 9 can completely enter the spiral blanking device 8, and is scattered by the spiral blanking device 8 and sent into the stirring tank 1; meanwhile, the extending end of the clarifying plate 10 is connected with the extending end of the discharging plate 9 through the sealing plate, one side, close to the clarifying plate 10, of the spiral discharging device 8 is blocked through the sealing plate, the slurry in the stirring groove 1 can be prevented from permeating into the discharging plate 9, the spiral discharging device 8 is effectively prevented from splashing on the clarifying plate 10 when the phosphogypsum is scattered and discharged, and the quality of the slurry sent out through the supernatant outlet 6 is guaranteed.

In some embodiments, the extending end of the clarifying plate 10 is inclined upwards, so that the position of the clarifying plate 10 close to the supernatant outlet 6 is lower, which not only can ensure that the supernatant can fully enter the supernatant outlet 6, but also can effectively intercept the slurry precipitate in the stirring tank 1, and ensure that the liquid entering the supernatant outlet 6 is clearer.

In some embodiments, the lowest height of the clarifying plate 10 is not less than the highest height of the blanking plate 9, so that when phosphogypsum is added into the stirring tank 1 or is scattered through the spiral blanking device 8, the phosphogypsum directly splashes to the inner side of the clarifying plate 10 and enters the supernatant outlet 6 along with the supernatant, and the blockage of a pipeline for conveying the supernatant and the heat exchanger 2 is effectively avoided; one specific structure of the refining plate 10 is shown here, namely that the refining plate 10 is semicircular and is located at an offset from the screw feeder 8, and the refining plate 10 also has an offset first notch 11 corresponding to the screw feeder 8. The above description shows only one structure of the clarification plate 10, but the structure of the clarification plate 10 is not limited to the above one, and for example, the clarification plate 10 may be directly a mesh structure or the like covering the inlet end of the supernatant outlet 6.

In some embodiments, a baffle plate 12 is further installed on the inner wall of the stirring tank 1, the baffle plate 12 is located below the blanking plate 9, and the baffle plate 12 corresponds to the blades on the stirring paddle 3, so that when the stirring paddle 3 is used for stirring, a vortex is formed in the stirring tank 1 by the slurry, and the washing effect is better.

In some embodiments, the number of the baffle plates 12 is multiple, the baffle plates 12 extend to the center of the stirring tank 1, and the baffle plates 12 are uniformly arranged along the inner wall of the stirring tank 1, so that when the stirring paddle 3 stirs, the slurry is more turbulent in the stirring tank 1, and the washing effect is greatly improved.

In some embodiments, the central axis of the supernatant fluid circulating inlet 7 is tangent to the bottom of the stirring tank 1, so that the supernatant fluid entering through the supernatant fluid circulating inlet 7 enters along the bottom of the stirring tank 1, and the supernatant fluid is flushed away from the slurry deposited on the bottom of the stirring tank 1 when entering the stirring tank 1, thereby realizing repeated washing of the slurry and greatly improving the washing effect of the phosphogypsum. .

In some embodiments, a driving motor 13 for driving the stirring paddle 3 to rotate is further supported at the top of the stirring tank 1, specifically, a rack is mounted at the top of the stirring tank 1, the driving motor 13 is fixedly mounted on the rack, an output end of the driving motor 13 is connected with the stirring paddle 3 through a coupler, and the stirring paddle 3 rotates in the stirring tank 1 through the driving of the driving motor 13, so that the stirring of the stirring paddle 3 on the slurry is realized, and the washing of the phosphogypsum is completed.

In some embodiments, a slurry pump 14 is further installed between the supernatant outlet 6 and the inlet end of the heat exchanger 2, so that the supernatant enters the stirring tank 1 through the supernatant circulation inlet 7 at a higher speed, the supernatant has a better impact effect on the slurry deposited at the bottom of the stirring tank 1, and the phosphogypsum washing effect is better.

When the phosphogypsum needs to be washed, a driving motor 13 is started to rotate a stirring paddle 3, the phosphogypsum and water are sent to a blanking plate 9, the phosphogypsum and the water move to a spiral blanking device 8 along with the blanking plate 9 through self weight, the spiral blanking device 8 breaks up the phosphogypsum after the phosphogypsum enters the spiral blanking device 8, the broken-up phosphogypsum falls on the bottom of a stirring tank 1, the stirring paddle 3 stirs the phosphogypsum and the water to wash the phosphogypsum, a slurry pump 14 is started along with the gradual rise of the liquid level in the stirring tank 1, supernatant in the stirring tank 1 is filtered through a clarifying plate 10 and then sent into a heat exchanger 2 from a supernatant outlet 6, the supernatant exchanges heat while passing through the heat exchanger 2, the supernatant enters the bottom of the stirring tank 1 from a supernatant circulation inlet 7 after the heat exchange, the slurry deposited at the bottom of the stirring tank 1 is broken up, and the slurry continues to be washed along with the stirring of the stirring paddle 3, the washing is repeated continuously, and after the washing is finished, the materials are sent out from the slurry outlet 5.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The phosphogypsum washing system is characterized by comprising a stirring tank (1) and a heat exchanger (2), wherein a slurry outlet, a supernatant outlet (6) and a supernatant circulation inlet (7) are arranged on the stirring tank (1), the supernatant outlet (6) and the supernatant circulation inlet (7) are respectively arranged at the upper end and the lower end of the stirring tank (1), the supernatant outlet (6) is connected with the inlet end of the heat exchanger (2), and the supernatant circulation inlet (7) is connected with the outlet end of the heat exchanger (2).

2. The phosphogypsum washing system according to claim 1, characterized in that the upper end of the stirring paddle (3) is also provided with a spiral feeder (8).

3. The phosphogypsum washing system according to claim 2, characterized in that a blanking plate (9) is also installed in the stirring tank (1), and the extending end of the blanking plate (9) is inclined towards the spiral blanking device (8).

4. The phosphogypsum washing system according to claim 3, characterized in that the blanking plate (9) is semicircular, and the blanking plate (9) is provided with a first notch (11) avoiding the spiral blanking device (8).

5. The phosphogypsum washing system according to claim 3 or 4, characterized in that the stirring tank (1) is also provided with a water inlet (4), and the water inlet (4) is positioned above the blanking plate (9).

6. The phosphogypsum washing system according to claim 3 or 4, characterized in that a clarifying plate (10) is also installed in the stirring tank (1), and the clarifying plate (10) corresponds to the supernatant liquor circulating inlet (7).

7. The phosphogypsum washing system according to claim 6, wherein the clarifying plate (10) is semicircular, a second notch (11) avoiding the spiral feeder (8) is arranged on the clarifying plate (10), and a sealing plate is connected between the extending end of the clarifying plate (10) and the feeding plate (9); further, the extending end of the clarifying plate (10) is inclined upwards; further, the lowest height of the clarifying plate (10) is not less than the highest height of the blanking plate (9).

8. The phosphogypsum washing system according to claim 1, characterized in that the inner wall of the stirring tank (1) is also provided with a baffle plate (12), and the baffle plate (12) is positioned below the blanking plate (9); furthermore, the number of the baffle plates (12) is multiple, and the baffle plates (12) extend towards the center of the stirring tank (1).

9. The phosphogypsum washing system according to claim 1, characterized in that the central axis of the supernatant liquor circulation inlet (7) is tangent to the bottom of the stirred tank (1).

10. The phosphogypsum washing system according to claim 1, characterized in that the top of the stirring tank (1) is also supported with a driving motor (13) for driving the stirring paddle (3) to rotate; further, a slurry pump (14) is arranged between the supernatant outlet (6) and the inlet end of the heat exchanger (2).