Phosphogypsum drying and washing integrated machine

Abstract

The utility model discloses a kind of phosphogypsum washing integrated machine, including support and being arranged in the support: cleaning system, for receiving phosphogypsum raw material, phosphogypsum raw material is stirred and cleaned, and washing wastewater is discharged and is concentrated recovery;Drying system, receiving the phosphogypsum after cleaning from cleaning system and drying it;Conveying device, including conveyor belt, and by conveyor belt receiving the phosphogypsum after cleaning from cleaning system is transported to drying unit and is dried, and phosphogypsum after drying is transported out;The utility model is in the process in the same equipment of cleaning process and drying process, realize cleaning drying to complete in same process, solve the problem of directly discharging after cleaning liquid is used one time, reduce floor area;Avoid blockage in use process to improve production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of industrial solid waste treatment technology, and in particular to a phosphogypsum drying and washing integrated machine. Background Technology

[0002] Phosphogypsum is a byproduct of phosphate fertilizer production. Due to the large scale of phosphate fertilizer production, phosphogypsum accumulates significantly during the production process. Therefore, the utilization of phosphogypsum waste after treatment is a common practice in this field.

[0003] The main component of phosphogypsum is calcium sulfate dihydrate, which often contains impurities such as phosphorus, fluorine, organic matter, and heavy metals. In particular, some water-soluble impurities seriously hinder the utilization of phosphogypsum waste. Since the main task is to remove water-soluble impurities, water washing has become a common method for treating phosphogypsum.

[0004] In existing technologies, the washing of phosphogypsum involves flushing the phosphogypsum with water to dissolve soluble impurities, filtering out the wastewater, and then drying the filtered phosphogypsum for later use. This process results in significant wastewater discharge, and since washing and drying occur in separate processes, the equipment requires a large footprint and is prone to system blockage during transport, leading to low washing efficiency.

[0005] Therefore, it is necessary to improve the existing phosphogypsum cleaning process to complete cleaning and drying in the same process, solve the problem of direct discharge of cleaning solution after single use, reduce the floor space required, and avoid clogging during use to improve production efficiency. Utility Model Content

[0006] In view of this, the purpose of this utility model is to provide a phosphogypsum drying and washing integrated machine, which realizes the completion of cleaning and drying in the same process, solves the problem of direct discharge of cleaning liquid after single use, reduces the floor space, and avoids clogging during use, thereby improving production efficiency.

[0007] This utility model provides a phosphogypsum drying and washing integrated machine, including a support frame and a component disposed on the support frame:

[0008] The cleaning system is used to receive phosphogypsum raw materials, stir and clean the phosphogypsum raw materials, discharge cleaning wastewater and collect it centrally;

[0009] The drying system receives the cleaned phosphogypsum from the cleaning system and dries it.

[0010] The conveying device includes a conveyor belt, which receives the cleaned phosphogypsum from the cleaning system and transports it to the drying unit for drying, and then transports the dried phosphogypsum out.

[0011] Furthermore, the cleaning system includes:

[0012] The stirring and cleaning unit is used to stir the received phosphogypsum raw material and clean it with cleaning water;

[0013] The filtration unit is used to filter out the cleaning wastewater generated by the stirring and cleaning unit and retain the filtered phosphogypsum.

[0014] Furthermore, the cleaning system also includes a cleaning chamber, and the stirring cleaning unit includes a stirring working end and the stirring working end is disposed inside the cleaning chamber; a feed funnel is provided on the upper part of the cleaning chamber to transport phosphogypsum raw material to the feed inlet of the stirring cleaning unit, and the opening of the feed inlet is adjustable.

[0015] Furthermore, the stirring and cleaning unit also includes a drive motor and a water supply pipe, the stirring working end includes a cleaning shaft and stirring blades disposed on the cleaning shaft, and the filtration unit is located at the lower part of the stirring and cleaning unit.

[0016] Furthermore, a wastewater collection unit is provided at the lower part of the filtration unit, and a closable wastewater centralized discharge pipe is connected to the wastewater collection unit.

[0017] Furthermore, the filtration unit is an inverted conical filter screen, and the cleaning box is provided with an openable and closable discharge port at the upper position of the inverted conical screen. The stirring blade at the bottom is arc-shaped on the stirring plane.

[0018] Furthermore, the cleaning shaft is a hollow structure, and several cleaning water outlets are provided on the side wall of the cleaning shaft at positions corresponding to the stirring blades. The water supply pipe inputs cleaning water through the hollow opening at the upper end of the cleaning shaft.

[0019] Furthermore, the wastewater collection unit has an inverted conical bottom, and a wastewater outlet is provided in the middle of the inverted conical bottom. The wastewater centralized discharge pipe is connected to the wastewater outlet.

[0020] Furthermore, the drying unit includes a housing and a heating component disposed within the housing. The housing is fixed to the cleaning chamber, and the conveyor belt passes through the housing at a lower position.

[0021] The discharge port of the cleaning chamber is located on one side of the drying unit and above the conveyor belt.

[0022] Furthermore, the drive motor transmits power to the cleaning shaft through a transmission device, which includes a bevel gear pair and a gearbox. The drive motor is mounted outside the cleaning chamber, and its power output shaft extends into the chamber to transmit power to the bevel gear pair. The cleaning shaft passes through the gearbox in a sealed manner, so that the hollow opening of the cleaning shaft is located outside the gearbox for inserting the water supply pipe. A conical protective cover is provided on the upper part of the cleaning shaft.

[0023] The beneficial effects of this utility model are as follows: This utility model provides a phosphogypsum drying and washing integrated machine, which integrates the washing and drying processes in the same equipment process, realizes the completion of washing and drying in the same process, solves the problem of direct discharge of cleaning liquid after one-time use, and reduces the floor space occupied; it avoids clogging and improves production efficiency during use. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0025] Figure 1 This is a schematic diagram of the structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the internal structure of this utility model. Detailed Implementation

[0027] Figure 1 This is a schematic diagram of the structure of this utility model. Figure 2 This is a schematic diagram of the internal structure of the present invention, as shown in the figure: An integrated drying and washing machine for phosphogypsum according to this embodiment includes a support frame 4 and components disposed on the support frame 4:

[0028] Cleaning system 1 is used to receive phosphogypsum raw materials, stir and clean the phosphogypsum raw materials, discharge cleaning wastewater and collect it centrally; stirring and cleaning refers to using external force to stir the phosphogypsum while passing cleaning water through it. After cleaning, the wastewater is separated and collected centrally, such as being collected into a wastewater tank or other container for further processing. This is a subsequent process and will not be described in detail here.

[0029] Drying system 2 receives the cleaned phosphogypsum from the cleaning system and dries it; drying system 2 can be any method that can dry the cleaned phosphogypsum using existing technology, such as hot air drying, direct drying with heating elements, etc., which will not be elaborated here;

[0030] The conveying device 3 includes a conveyor belt 302, which receives the cleaned phosphogypsum from the cleaning system and transports it to the drying unit for drying, and then transports the dried phosphogypsum out. In this structure, the conveyor belt 302 passes through the discharge port (or discharge section) of the cleaning system 1 and the drying section of the drying system 2, directly drying the cleaned phosphogypsum. The overall process is smooth and there is no clogging problem. Of course, the conveyor belt 302 should also include other auxiliary structures, such as drive motors, support rollers, etc., which are conventional structures of conveyor belts and will not be described in detail here. A scraper 303 is also provided at the discharge end of the conveyor belt to prevent downward adhesion and facilitate discharge, which will not be described in detail here.

[0031] Of course, the washing system, drying system, and conveying device are all housed in the support frame, and the structure of the support frame is... Figure 1This is for illustrative purposes only and does not represent an actual support structure. In practical applications, the support structure should consist of a foundation, trusses (or a combination with concrete) forming an integral support structure. The cleaning system, drying system, and conveying device are all installed on the support using conventional mechanical fixing methods. Therefore, the structure and installation method of the support are not part of the technical solution claimed in this utility model and will not be elaborated upon here. Simultaneously, the conveyor belt of the conveying device should have sufficient width and protective railings on both sides to prevent phosphogypsum from scattering after cleaning. Furthermore, the bottom should have a water collection tray (a method already in use and will not be elaborated upon here) to prevent the phosphogypsum carrying some wastewater from being discharged indiscriminately. The wastewater collected in the water collection tray should naturally be transported to a wastewater tank or other container, which will not be elaborated upon here. Figure 1 As shown, the cleaning system 1 is equipped with a control panel 101 to control the stirring parameters, such as stirring intensity and stirring cleaning time. This is a prior art control method and will not be described further. The drying device 2 is equipped with a control panel 201 to control the drying parameters, such as temperature and drying time. This is a prior art control method and will not be described further. The transmission device 3 is equipped with a control panel 301 to control the parameters of the conveyor belt 302, such as start / stop and speed. This is a prior art control method and will not be described further. Of course, for the phosphogypsum itself after cleaning, the impurity content can be detected before drying to guide the cleaning system (cleaning time, solid-liquid ratio, water flow rate, etc.) to achieve product qualification. Humidity is detected before and after drying to provide guidance for the parameters of the drying system, and also to guide the start / stop and speed of the conveyor belt. The above detection can be performed manually or automatically, which are all prior art detection methods and settings, and will not be described further.

[0032] In this embodiment, the cleaning system includes:

[0033] The stirring and cleaning unit 104 is used to stir the received phosphogypsum raw material and clean it with cleaning water. The water and phosphogypsum raw material are mixed by stirring. The cleaning can be carried out by direct filtration with continuous water flow, or by stirring and cleaning first, and then opening the filter channel to achieve filtration after cleaning. Obviously, the former has a better cleaning effect than the latter, which will not be elaborated here. The stirring method can be a rotary blade stirring or other mechanical stirring methods, which will not be elaborated here.

[0034] The filtration unit is used to filter out the cleaning wastewater generated by the stirring and cleaning unit and retain the filtered phosphogypsum. The filtration unit is generally a filter screen. The filter screen for phosphogypsum cleaning and filtration can be made of common materials and structures, which will not be described in detail here.

[0035] In this embodiment, the cleaning system further includes a cleaning chamber 103. The stirring and cleaning unit 104 includes a stirring working end, which is disposed inside the cleaning chamber 103, as shown in the figure. The cleaning chamber 103 is fixed to the bracket 4 (the fixing method adopts the existing mechanical fixing method, which will not be described in detail here). A feed funnel 102 is provided on the upper part of the cleaning chamber 103 to transport phosphogypsum raw materials to the feed inlet of the stirring and cleaning unit 104. The opening of the feed inlet is adjustable, such as... Figure 2 As shown, the adjustable opening of the feed inlet is achieved through the feed inlet gate 1021. The feed inlet gate 1021 (single-sided or double-sided; this embodiment adopts a double-sided gate structure, which can save operating space, and the material enters from the middle) changes the feed channel of the feed inlet by reciprocating the gate, thereby adjusting the feed amount, which will not be described in detail here. The reciprocating movement of the feed inlet gate 1021 can be carried out by electric control or manual operation, both of which are common control methods in the prior art, and will not be described in detail here.

[0036] In this embodiment, the stirring and cleaning unit 104 further includes a drive motor 1045 and a water supply pipe 1044. The stirring working end includes a cleaning shaft 1041 and stirring blades 1042 disposed on the cleaning shaft. The filter unit is located at the lower part of the stirring and cleaning unit 104. Figure 2 As shown, the water supply pipe 1044 delivers cleaning water to the cleaning tank 103. The rotation of the cleaning shaft 1041 drives the stirring blades 1042 to stir the phosphogypsum raw material in the tank and mix it thoroughly with the cleaning water from the water supply pipe 1044. The cleaning water is filtered out and carries away soluble impurities, thus completing the cleaning process. In fact, the filter screen used for phosphogypsum cleaning has water-filtering properties, but because it cannot pass through phosphogypsum particles, the water filtration rate is not high. Under continuous water flow and stirring conditions, there will be enough water in the cleaning tank to fully mix with the phosphogypsum and clean it. Under normal circumstances, the liquid-solid ratio in the cleaning tank can be lower than that of immersion cleaning (filtering after complete cleaning). This ratio is controlled by adjusting the water inlet flow, and is generally not higher than 4:1. This will not be elaborated further here.

[0037] In this embodiment, a wastewater collection unit is provided at the lower part of the filtration unit, and a wastewater centralized discharge pipe that can be opened and closed is provided in connection with the wastewater collection unit; the wastewater filtered by the filtration unit is collected by the wastewater collection unit and then discharged through the wastewater centralized discharge pipe 1010. Of course, the wastewater centralized discharge pipe 1010 can be equipped with an opening and closing valve, which will not be described in detail here.

[0038] In this embodiment, the filtration unit is an inverted conical filter screen 106, as shown in the figure. The inverted conical filter screen 106 is fixed to the inner wall of the cleaning chamber 103. It is usually made of polypropylene filter screen with a pore size controlled between 5-16 micrometers. Generally, a support structure fixed to the cleaning chamber 103 is required for support to ensure strength during the cleaning process. This is a general installation structure for filter screens and will not be described in detail here. The structure of the inverted conical filter screen 106 is conducive to the aggregation and dispersion of gypsum raw materials during the stirring process, and also facilitates the concentrated flow of cleaning water to form a flowing rinse, thereby improving cleaning efficiency.

[0039] The cleaning chamber 103 is equipped with an openable and closable discharge port 1032 located above the inverted conical screen 106. The opening and closing is controlled by a discharge gate 10321, which reciprocates electrically or manually to close or open. Alternatively, the discharge gate can be a butterfly valve, achieving the intended purpose of the invention. The discharge gate 10321 should have good sealing performance; however, a small amount of leakage is permissible. Since a drainage system is provided under the conveyor belt 302, a small amount of leakage of cleaning water will not affect the cleaning process. Figure 2 As shown, the discharge port is located on the side wall of the cleaning chamber corresponding to the drying system, and is equipped with an outlet section. The discharge gate 10321 is installed on the section, and a gate seat that mates with the discharge gate should be provided inside the section. The overall structure is similar to that of a gate valve. Since the gypsum at this location is paste-like, the gate can squeeze out the gypsum in the gate seat to complete the seal when closed. To ensure that there is no leakage from the gate channel opened on the section, the gate channel is generally located at the top, and the gate is moved up and down by control at the top, which will not be described in detail here. The stirring blade 1043 at the bottom is arc-shaped on the stirring plane. During stirring, the cleaning shaft 1041 drives the stirring blade 10321 at the bottom. Rotating 043 in the direction of the arc-shaped interior has the effect of gathering materials to complete the cleaning, and the upper stirring blades 1042 work together to complete the stirring; after the cleaning is completed, the water supply is stopped and the wastewater is filtered out, the cleaning shaft 1041 drives the stirring blades 1043 to reverse, and uses the outer side of the arc to push the material in the circumferential direction, so that the cleaned phosphogypsum can be discharged from the outlet (of course, at this time the discharge gate is open), which has a completely mechanical and automated nature, and will not be described in detail here; in terms of structural dimensions, the radial dimension of the bottom stirring blades 1043 should be as close as possible to the inner wall of the cleaning tank (the cleaning tank is cylindrical), and the height should have a certain dimension to ensure high efficiency when pushing materials.

[0040] In this embodiment, the cleaning shaft 1041 is a hollow structure, and several cleaning water outlets 10411 are provided on the side wall of the cleaning shaft 1041 at positions corresponding to the stirring blades 1042. The water supply pipe 1044 inputs cleaning water through the hollow opening at the upper end of the cleaning shaft 1041. Figure 2 As shown, this structural design greatly saves water supply time; moreover, the cleaning water is transported by the cleaning shaft, and centrifugal force can be used to evenly distribute the cleaning water, improving efficiency and achieving better cleaning results.

[0041] In this embodiment, the wastewater collection unit is an inverted conical bottom 107, and a wastewater outlet is provided in the middle of the inverted conical bottom 107. The wastewater centralized discharge pipe 1010 is connected to the wastewater outlet. As shown in the figure, the inverted conical bottom 107 is fixedly supported on the inner wall of the cleaning tank 103. In order to form a stable support, a separate support rib can be set, which is a common fixing method in the mechanical field. The design of the inverted conical bottom is conducive to improving the efficiency of wastewater collection, which will not be elaborated here.

[0042] In this embodiment, the drying unit 2 includes a shell 202 and a heating component 203 disposed within the shell. The shell 202 is fixed to the cleaning chamber 103, and the fixing method can be detachable or welded, forming an integral structure and reducing the floor space. The shell needs to be insulated, which can be achieved by conventionally incorporating an internal heat-resistant insulation layer, and will not be elaborated further here. As shown in the figure, the shell 202 has a transition section, which is fixed to the cleaning chamber 103. The discharge port of the cleaning chamber 103 is located in the transition section, and the starting section of the conveyor belt 302 is also located in the transition section, forming a receiving point for the discharge. No insulation or heat-resistant layer is required, and will not be elaborated further. The conveyor belt 302 passes through the outer shell 202 at a lower position, thereby bringing the cleaned plaster to the space inside the outer shell where the heating component 203 is located for drying, and will not be elaborated further. Of course, the space inside the outer shell 202 where the heating component 203 is located needs to be equipped with a heat-insulating soft curtain at the position corresponding to the conveyor belt to ensure the heat preservation effect. At the same time, a ventilation structure should also be provided to ensure the discharge of evaporated water vapor, thereby ensuring the drying effect. Of course, the conveyor belt needs to have a certain ability to withstand high temperatures, such as a conveyor belt made of high-temperature resistant composite materials, and will not be elaborated further.

[0043] In this embodiment, the drive motor 1045 transmits power to the cleaning shaft 1041 via a transmission device. The transmission device includes a bevel gear pair 1046 and a gearbox. The structure of the bevel gear pair 1046 located inside the gearbox is a common structure in the transmission field and will not be described in detail here. The drive motor 1045 is installed outside the cleaning housing 103, and its power output shaft extends into the housing to transmit power to the bevel gear pair 1046. The cleaning shaft 1041 is sealed and extends out of the gearbox, so that the hollow opening of the cleaning shaft 1041 is located outside the gearbox for inserting the water pipe 1044. A conical protective cover 105 is provided on the upper part of the cleaning shaft 1041, as shown in the figure. The conical protective cover 105 is open to the air intake. The gearbox is supported by a support rod fixed to the gearbox body, which is a common support structure to prevent phosphogypsum blocks falling from the hopper from entering the cleaning shaft 1041; this will not be described in detail here. As shown in the figure, a support frame 1031 is fixedly installed inside the cleaning box 103, and the gearbox is fixed on the support frame 1031. The power output shaft of the drive motor 1045 extends horizontally and sealed into the gearbox, and transmits power to the vertically arranged cleaning shaft 1041 through the bevel gear pair 1046. The cleaning shaft 1041 forms a rotating pair in the vertical direction that requires vertical limiting. For example, a limiting boss is provided on the cleaning shaft, and support is formed by a plane bearing. Of course, it needs to be sealed and lubricated. This is a mechanical transmission setting of the prior art, which will not be described in detail here.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A phosphogypsum drying and washing integrated machine, characterized in that: Including the bracket and the components mounted on it: The cleaning system is used to receive phosphogypsum raw materials, stir and clean the phosphogypsum raw materials, discharge cleaning wastewater and collect it centrally; The drying system receives the cleaned phosphogypsum from the cleaning system and dries it. The conveying device includes a conveyor belt, which receives the cleaned phosphogypsum from the cleaning system and transports it to the drying unit for drying, and then transports the dried phosphogypsum out.

2. The phosphogypsum drying and washing integrated machine according to claim 1, characterized in that: The cleaning system includes: The stirring and cleaning unit is used to stir the received phosphogypsum raw material and clean it with cleaning water; The filtration unit is used to filter out the cleaning wastewater generated by the stirring and cleaning unit and retain the filtered phosphogypsum.

3. The phosphogypsum drying and washing integrated machine according to claim 2, characterized in that: The cleaning system also includes a cleaning chamber, and the stirring cleaning unit includes a stirring working end and the stirring working end is disposed inside the cleaning chamber; a feed funnel is provided on the upper part of the cleaning chamber to transport phosphogypsum raw material to the feed inlet of the stirring cleaning unit, and the opening of the feed inlet is adjustable.

4. The phosphogypsum drying and washing integrated machine according to claim 3, characterized in that: The stirring and cleaning unit also includes a drive motor and a water supply pipe. The stirring working end includes a cleaning shaft and stirring blades disposed on the cleaning shaft. The filtration unit is located at the lower part of the stirring and cleaning unit.

5. The phosphogypsum drying and washing integrated machine according to claim 4, characterized in that: A wastewater collection unit is located at the lower part of the filtration unit, and a closable wastewater discharge pipe is connected to the wastewater collection unit.

6. The phosphogypsum drying and washing integrated machine according to claim 5, characterized in that: The filtration unit is an inverted conical filter screen. The cleaning box is provided with an openable and closable discharge port at the upper position of the inverted conical screen. The stirring blades at the bottom are arc-shaped on the stirring plane.

7. The phosphogypsum drying and washing integrated machine according to claim 5, characterized in that: The cleaning shaft is a hollow structure, and several cleaning water outlets are opened on the side wall of the cleaning shaft at positions corresponding to the stirring blades. The water supply pipe inputs cleaning water through the hollow opening at the upper end of the cleaning shaft.

8. The phosphogypsum drying and washing integrated machine according to claim 5, characterized in that: The wastewater collection unit has an inverted conical bottom, and a wastewater outlet is provided in the middle of the inverted conical bottom. The wastewater centralized discharge pipe is connected to the wastewater outlet.

9. The phosphogypsum drying and washing integrated machine according to claim 5, characterized in that: The drying unit includes a housing and a heating component disposed inside the housing. The housing is fixed to the cleaning chamber, and the conveyor belt passes through the housing at a lower position. The discharge port of the cleaning chamber is located on one side of the drying unit and above the conveyor belt.

10. A phosphogypsum drying and washing integrated machine according to claim 5, characterized in that: The drive motor transmits power to the cleaning shaft through a transmission device. The transmission device includes a bevel gear pair and a gearbox. The drive motor is installed outside the cleaning box and its power output shaft extends into the box to transmit power to the bevel gear pair. The cleaning shaft passes through the gearbox in a sealed manner, so that the hollow opening of the cleaning shaft is located outside the gearbox for inserting the water supply pipe. A conical protective cover is provided on the upper part of the cleaning shaft.

Images