A belt filter for washing phosphogypsum

Abstract

The present application relates to phosphogypsum, in order to improve the processing efficiency of phosphogypsum, provide a kind of for phosphogypsum washing belt filter, including washing unit;Washing unit includes conveying belt, multiple piece along the transport direction of conveying belt and is provided with washing device, and is located at the cleaning device of the end of conveying belt;Washing device includes the spraying device being located above conveying belt, and the negative pressure device being located below conveying belt and being directly below the spraying device;The outlet end of a negative pressure device is connected with the spraying device adjacent and located in its upstream.The belt filter for phosphogypsum washing of the present application can efficiently and in real time wash phosphogypsum.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of phosphogypsum, in particular to a belt filter for phosphogypsum washing. BACKGROUND

[0002] Phosphogypsum is a solid waste produced in the wet-process phosphoric acid process, and its main component is calcium sulfate dihydrate. The composition of phosphogypsum is relatively complex, in addition to calcium sulfate, there are also incomplete decomposition of phosphate rock, residual phosphoric acid, fluorides, acid-insoluble substances, organic matter, etc., among which the presence of fluorine and organic matter has the greatest impact on the resource utilization of phosphogypsum. The random discharge and accumulation of phosphogypsum have seriously damaged the ecological environment, not only polluting groundwater resources, but also wasting land resources.

[0003] The largest utilization scenario of phosphogypsum is to use it in the construction industry, but due to the presence of a large amount of harmful impurities in phosphogypsum, it must be treated before it can be fully utilized. The common treatment method is to wash the phosphogypsum, remove the impurities in the phosphogypsum through multiple washing, and also recover the phosphoric acid therein, so that it meets the standard for application in the construction industry.

[0004] Common phosphogypsum washing is usually an independent closed washing process, that is, a large amount of phosphogypsum and washing liquid are injected into the washing device at one time, and then flow between different washing devices, finally realizing the cleaning of the phosphogypsum. However, such a system or device for treating phosphogypsum requires a large number of devices, and the phosphogypsum needs to flow in the device, as well as feeding and discharging, etc., resulting in low overall phosphogypsum treatment efficiency, and the phosphogypsum cannot be treated in real time, which may cause problems such as accumulation of phosphogypsum to some extent. SUMMARY

[0005] The purpose of the present application is to provide a belt filter for phosphogypsum washing, which can efficiently and in real time wash phosphogypsum.

[0006] The embodiment of the present application is realized by the following technical scheme: the belt filter for phosphogypsum washing of the present application comprises a washing unit; the washing unit comprises a conveyor belt, a plurality of washing devices arranged along the transportation direction of the conveyor belt, and a cleaning device arranged at the end of the conveyor belt; the washing device comprises a spraying device arranged above the conveyor belt, and a negative pressure device arranged below the conveyor belt and directly below the spraying device; the outlet end of the negative pressure device is connected with the spraying device adjacent thereto and located upstream thereof.

[0007] Further, the washing unit is provided with multiple units, the multiple units of the washing unit are connected in sequence, one discharge end of the cleaning device is connected with an initial end of the conveying belt located downstream of the cleaning device, and the negative pressure device located at the initial end of the conveying belt is connected with the spraying device located at the terminal end of the conveying belt.

[0008] Further, the cleaning device comprises a cleaning pool and an aeration device arranged in the cleaning pool.

[0009] Further, the cleaning device further comprises a high-frequency oscillation device arranged at the upper end inside the cleaning pool.

[0010] Further, the high-frequency oscillation device is an ultrasonic high-frequency oscillation device.

[0011] Further, the aeration device comprises an air compressor, an aeration pipe arranged at the bottom of the cleaning pool, and multiple aeration heads in communication with the aeration pipe, and the air compressor is in communication with the aeration pipe.

[0012] Further, the cleaning device further comprises a sedimentation device arranged in the cleaning pool, the sedimentation device is arranged below the aeration device, and the sedimentation device comprises multiple vertically arranged sedimentation plates.

[0013] Further, the negative pressure device comprises a negative pressure disc abutting against the lower surface of the conveying belt, a negative pressure tank connected with the negative pressure disc, and a negative pressure machine connected with the negative pressure tank, and the outlet end of the negative pressure machine is connected with the spraying device.

[0014] The technical scheme of the embodiment of the present application has at least the following advantages and beneficial effects: the belt filter for washing phosphogypsum of the present application is used to send mixed slurry to the initial end of the conveying belt, and the slurry moves along with the movement of the conveying belt, the washing water enters from the spraying device located at the terminal end of the conveying belt and is sprayed on the slurry, the liquid containing phosphoric acid in the slurry is sucked away by the negative pressure device below the conveying belt (the conveying belt has a multi-microporous structure) and is pumped into the spraying device located upstream of the conveying belt, and finally, the high-concentration phosphoric acid solution is discharged from the negative pressure device located at the water outlet end of the conveying belt, the washed phosphogypsum is discharged from the terminal end of the conveying belt into the cleaning device for deep cleaning, and the cleaned phosphogypsum can be directly used as usable gypsum in the construction industry. Through the device, not only the phosphogypsum can be fully washed and the phosphoric acid therein can be recovered, but also the cleaned phosphogypsum can be directly utilized, and the whole process can be continuously and automatically performed, that is, the phosphogypsum produced during the production of phosphoric acid can be discharged into the device for washing in real time, which significantly speeds up the processing flow of the phosphogypsum, reduces the accumulation and storage cost of the phosphogypsum, and improves the utilization of the phosphogypsum. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 Structure diagram of belt filter for washing phosphogypsum provided by the embodiment of the present application;

[0016] Figure 2 Structure diagram of washing unit part provided by the embodiment of the present application.

[0017] Figure: 10-washing device, 11-conveying belt, 12-spraying device, 13-negative pressure tank, 14-negative pressure pump, 15-phosphoric acid storage tank, 16-negative pressure disc, 17-slurry tank, 18-washing liquid storage tank, 20-cleaning device,

[0018] 20-cleaning pool, 21-aeration pipe, 22-aeration head, 23-air compressor, 24-high frequency oscillation device, 25-5 discharge pump, 26-waste liquid pump, 27-waste liquid pipe, 28-settling plate, 29-phosphogypsum storage tank. DETAILED DESCRIPTION

[0019] Embodiment

[0020] 0The following is further illustrated in combination with specific embodiments, as shown in the accompanying Figure 1 -attached Figure 2 The belt filter for washing phosphogypsum of the embodiment, as shown in the accompanying drawings, comprises a washing unit; the washing unit comprises a conveying belt 11, a plurality of washing devices 10 arranged along the conveying direction of the conveying belt 11, and a cleaning device 20 arranged at the end of the conveying belt 11; the washing device 10 comprises a spraying device 12 arranged above the conveying belt 11, and

[0021] a negative pressure device arranged below the conveying belt 11 and directly below the spraying device 12; the outlet 5 end of a negative pressure device is connected with the spraying device 12 adjacent and located upstream thereof. Specifically, in use, the mixed slurry in the slurry tank 17

[0022] is sent to the initial end of the conveying belt 11 through the slurry inlet, and moves along with the movement of the conveying belt 11, the washing water in the washing liquid storage tank 18 enters from the spraying device 12 located at the end of the conveying belt 11, and sprays the washing water on the slurry, the negative pressure device below the conveying belt 11 sucks the liquid containing phosphoric acid in the slurry through vacuum negative pressure (the conveying belt 11 is a multi-microporous structure) and pumps the liquid containing phosphoric acid into the spraying device 12 located upstream thereof, in this way, the final high-concentration phosphoric acid solution

[0023] is obtained.

[0024] The liquid is discharged from the negative pressure device at the water outlet end of the conveying belt and stored in the phosphoric acid storage tank 15, the washed phosphogypsum is discharged from the end of the conveying belt 11 into the cleaning device 20 for deep cleaning, and the cleaned phosphogypsum is stored in the phosphogypsum storage tank 29, which can be directly used as usable gypsum in the construction industry. By the device, not only the phosphogypsum can be fully washed and the phosphoric acid therein can be recovered, but also the cleaned phosphogypsum can be directly utilized, and the whole process can be continuously and automatically performed, that is, the phosphogypsum produced during the production of phosphoric acid can be washed in the device in real time, which significantly speeds up the phosphogypsum processing process, reduces the storage cost of phosphogypsum, and improves the utilization of phosphogypsum.

[0025] The washing unit in the embodiment is provided with multiple pieces, and the multiple pieces of washing unit are connected in series; the discharge end of the cleaning device 20 is connected with the initial end of the conveying belt 11 adjacent and downstream thereof; the negative pressure device at the initial end of the conveying belt 11 is connected with the spraying device 12 at the end of the adjacent conveying belt 11. Specifically, through the series action of multiple washing units, the impurities in the phosphogypsum can be more thoroughly cleaned, and the phosphoric acid therein can be fully extracted. It should be noted that when two adjacent washing units are connected, the washing liquid directly enters the spraying device 12 of the washing unit upstream thereof from the negative pressure device of the washing unit, without passing through the cleaning device 20; after the phosphogypsum is discharged from the end of the conveying belt 11 into the cleaning device 20, the cleaned phosphogypsum is pumped into the conveying belt 11 downstream thereof by the discharge pump 25 and the waste liquid pipe 27.

[0026] The cleaning device 20 in the embodiment includes a cleaning pool 20 and an aeration device arranged in the cleaning pool 20. The aeration device includes an air compressor 23, an aeration pipe 21 arranged at the bottom of the cleaning pool 20, and multiple aeration heads 22 in communication with the aeration pipe 21; the air compressor 23 is in communication with the aeration pipe 21. Specifically, the aeration head 22 is also called bubble stone, which can generate a large number of dense micro-bubbles in the cleaning pool 20, and the aeration device can well impact the surface of the phosphogypsum to wash the impurities on the surface of the phosphogypsum, and the washed impurities float up with the bubbles and are discharged through the waste liquid pump 26 and the waste liquid pipe 27.

[0027] The cleaning device 20 in the embodiment further includes a high-frequency oscillation device 24 arranged at the upper end inside the cleaning pool 20. The high-frequency oscillation device 24 is an ultrasonic high-frequency oscillation device 24. Specifically, the high-frequency oscillation device 24 can scatter the phosphogypsum, so that it is more uniformly distributed in the cleaning pool 20.

[0028] The cleaning device 20 in the embodiment further comprises a sedimentation device arranged in the cleaning tank 20; the sedimentation device is arranged below the aeration device, and comprises a plurality of vertically arranged sedimentation plates 28. Specifically, the sedimentation device can make the phosphogypsum particles smoothly settle at the bottom of the cleaning tank 20 and be discharged through the discharge pump 25 and the discharge pipe.

[0029] The negative pressure device in the embodiment comprises a negative pressure disc 16 abutting against the lower surface of the conveying belt 11, a negative pressure tank 13 connected with the negative pressure disc 16, and a negative pressure machine connected with the negative pressure tank 13, and the outlet end of the negative pressure machine is connected with the spraying device 12. Specifically, the negative pressure generated by the negative pressure machine acts on the negative pressure disc 16 through the negative pressure tank 13, and the liquid on the conveying belt 11 is sucked away, and then the sucked liquid is pumped into the adjacent spraying device 12.

[0030] In summary, the belt filter for washing phosphogypsum in the embodiment is used to send the mixed slurry to the initial end of the conveying belt 11, and the slurry moves along with the movement of the conveying belt 11, the washing water enters from the spraying device 12 located at the end of the conveying belt 11 and is sprayed on the slurry, the liquid containing phosphoric acid in the slurry is sucked away by the negative pressure device below the conveying belt 11 (the conveying belt 11 is a microporous structure) and pumped into the spraying device 12 located upstream, and finally the high-concentration phosphoric acid solution is discharged from the negative pressure device located at the water outlet end of the conveying belt, and the washed phosphogypsum is discharged from the end of the conveying belt 11 into the cleaning device 20 for deep cleaning, and the cleaned phosphogypsum can be directly used as usable gypsum in the construction industry. Through the device, not only the phosphogypsum can be fully washed and the phosphoric acid therein can be recovered, but also the cleaned phosphogypsum can be directly utilized, and the whole process can be continuously and automatically performed, that is, the phosphogypsum produced during the production of phosphoric acid can be washed in the device in real time, which significantly speeds up the processing flow of the phosphogypsum, reduces the storage cost of the phosphogypsum, and improves the utilization of the phosphogypsum.

[0031] The above merely describes the preferred embodiments of the present application, but should not be used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A belt filter for washing phosphogypsum, characterized in that: It includes a washing unit; the washing unit includes a conveyor belt, multiple washing devices arranged along the transport direction of the conveyor belt, and a cleaning device located at the end of the conveyor belt. The washing device includes a spray device located above the conveyor belt and a negative pressure device located below the conveyor belt and directly below the spray device. The outlet end of the negative pressure device is connected to the adjacent and upstream spray device; The washing unit comprises multiple units, which are connected end to end; the discharge end of one of the washing devices is connected to the initial end of the adjacent conveyor belt located downstream of it; the negative pressure device located at the initial end of the conveyor belt is connected to the spray device at the end of the adjacent conveyor belt. The cleaning device includes a cleaning tank and an aeration device installed in the cleaning tank. The cleaning device also includes a high-frequency oscillation device located at the upper end of the inside of the cleaning tank. The cleaning device also includes a settling device disposed in the cleaning tank; The settling device is located below the aeration device, and the settling device includes multiple vertically arranged settling plates.

2. The belt filter for washing phosphogypsum according to claim 1, characterized in that: The high-frequency oscillation device is an ultrasonic high-frequency oscillation device.

3. The belt filter for washing phosphogypsum according to claim 1, characterized in that: The aeration device includes an air compressor, an aeration pipe located at the bottom of the cleaning tank, and multiple aeration heads connected to the aeration pipe; the air compressor is connected to the aeration pipe.

4. The belt filter for washing phosphogypsum according to claim 1, characterized in that: The negative pressure device includes a negative pressure plate that abuts against the lower surface of the conveyor belt, a negative pressure tank connected to the negative pressure plate, and a negative pressure machine connected to the negative pressure tank. The outlet end of the negative pressure machine is connected to the spray device.

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