Topcon battery fluorine-containing wastewater calcium fluoride sludge treatment process based on double-layer printing process

Abstract

The invention discloses a topcon battery fluorine-containing wastewater calcium fluoride sludge treatment process based on a double-layer printing process, and relates to the technical field of solar cell production, the topcon battery fluorine-containing wastewater calcium fluoride sludge treatment process comprises the steps of wastewater pretreatment, accurate pH value regulation and control, efficient precipitation generation, fine sludge separation and drying, an online fluorine ion concentration detector and an automatic control program are combined to precisely add a calcium chloride solution to form precipitation particles easy to settle, a sludge treatment device adopts a double-layer filter pressing structure to improve the sludge dewatering effect, and meanwhile, a filter pressing belt cleaning and monitoring system is arranged to prevent filter holes from being blocked and monitor the state of a filter pressing belt in real time, so that the sludge dewatering effect is improved. According to the method, the fluorine-containing wastewater can be efficiently converted into the high-quality calcium fluoride sludge, the wastewater treatment cost is reduced, and the resource utilization rate is increased.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of solar cell production, and particularly relates to a topcon cell fluorine-containing wastewater fluorite sludge treatment process based on a double-layer printing process. BACKGROUND

[0002] With the continuous development of the photovoltaic industry, the requirements for the conversion efficiency, stability and cost control of solar cells are increasing, and the calcium chloride sludge is a kind of sludge containing calcium chloride generated in the processes of chemical production and water treatment, and the fluorite sludge generated in the photovoltaic production needs to be solidified and separated.

[0003] In the prior art, a fluorite crystallization preparation process and system with the publication number CN118929726A is disclosed, the amount of lime required is calculated according to the acidity and total amount of the acid water containing hydrofluoric acid in the acid water adjusting tank, the lime is prepared into calcium hydroxide emulsion in the lime dispensing tank, the calcium hydroxide emulsion is precipitated in the high-density sedimentation tank to obtain saturated calcium hydroxide solution, the acid water and the saturated calcium hydroxide solution are pumped into a crystallization fluidized bed reactor for crystallization reaction, the fluorite particles generated by crystallization are dehydrated to form fluorite products, the effluent of the crystallization fluidized bed reactor is subjected to coagulation and flocculation reaction in the coagulation sedimentation tank and then subjected to sedimentation treatment, the sludge generated by sedimentation is treated as waste solid, and the effluent of the coagulation sedimentation tank is returned to the lime dispensing tank for preparation of the calcium hydroxide emulsion, the utilization rate of lime is improved, the pH in the crystallization process is stably controllable, the purity of the fluorite product is improved, the consumption of clean water and the production cost are reduced, and secondary pollution caused by the use of calcium chloride is avoided.

[0004] In the preparation process of the fluorite sludge, the pH value in the waste liquid is not accurately controlled, and the sedimentation process cannot be monitored, so that the sedimentation and separation effect of the fluorite sludge is poor, and the preparation purity of the fluorite sludge is affected.

[0005] The filter press belt of the traditional filter press is prone to stretching deformation during use, and since there is no effective real-time monitoring mechanism, the operator cannot accurately determine the stretching state of the filter press belt, when the filter press belt is stretched beyond the maximum stretching amount, the equipment may be damaged, the cooperation between the squeezing roller and the filter press belt is affected, the filtration effect is affected, the cleaning effect of the filter press belt is poor, and the filter holes are easily blocked, which not only reduces the filtration performance of the filter press belt, but also further shortens the service life of the filter press belt. SUMMARY

[0006] The purpose of the present application is to provide a topcon battery fluorine-containing wastewater calcium fluoride sludge treatment process based on a double-layer printing process, which solves the following technical problems: during the preparation of calcium fluoride sludge, the control of the pH value of the waste liquid is not accurate, and the precipitation process cannot be monitored, resulting in poor separation effect of calcium fluoride sludge, affecting the preparation purity of calcium fluoride sludge, it is difficult to accurately judge the expansion state of the filter belt, which may cause equipment damage, and problems may occur in the cooperation between the extrusion roller and the filter belt, affecting the filtration effect.

[0007] The purpose of the present application can be achieved by the following technical solutions:

[0008] A topcon battery fluorine-containing wastewater calcium fluoride sludge treatment process based on a double-layer printing process, comprising the following steps:

[0009] S1: wastewater pretreatment. The fluorine-containing wastewater generated in various photovoltaic production processes is collected and poured into a conditioning tank, and a stirring device is started to mix the wastewater thoroughly to achieve homogeneity and uniformity.

[0010] S2: accurate pH control. The wastewater is lifted from the conditioning tank to the acidification reaction unit, a high-precision pH meter is used to monitor the pH value of the wastewater in real time, and according to the initial pH value and the target acidity range, dilute sulfuric acid is added, the addition process uses an automatic control system, and a peristaltic pump is used to adjust the sulfuric acid flow in real time according to the feedback signal of the pH meter to ensure stable pH value decrease. Under this acidity condition, the activity of fluoride ions is significantly improved, laying a foundation for subsequent efficient reaction with calcium ions. During the control process, the reaction temperature is 25-35℃, and the acidification reaction is fully completed.

[0011] S3: efficient precipitation. The acidified wastewater flows into the precipitation reactor, according to the data of the online fluoride ion concentration detector, combined with the stoichiometric model, and through the automatic control program, the soluble calcium chloride solution is accurately added for full contact reaction, and water bath heating or built-in serpentine coil is used for accurate temperature control to ensure uniform temperature of the reaction system and give sufficient maturation time for the growth of the precipitated particles. During the reaction process, slow stirring is used to promote the gradual aggregation and growth of the small calcium fluoride crystal nuclei in the wastewater, forming precipitated particles with uniform particle size and easy to settle.

[0012] S4: fine separation of sludge. The mixed liquid after precipitation reaction is sent to the sludge treatment device for solid-liquid separation. Before sludge preparation, the sludge is conditioned by adding an appropriate amount of flocculating agent, such as polyacrylamide, to the mixed liquid to make the small calcium fluoride precipitated particles aggregate into larger flocs, improve the filter pressing effect, and treat the wastewater through the sludge treatment device to achieve efficient separation of sludge and liquid.

[0013] S5: drying. The output calcium fluoride sludge is dried by using a dryer, and when the water content is reduced to 5%-10%, the high-quality calcium fluoride sludge product is discharged in time, which is convenient for long-term storage and transportation, and realizes perfect conversion of the fluorine-containing wastewater into high-purity calcium fluoride product.

[0014] Preferably, in S1, the residence time of the adjusting tank is set according to the wastewater production and the load capacity of the subsequent treatment unit, and the residence time is 1-3h. In S2, according to the initial pH value and the target acidity range, dilute sulfuric acid with a concentration of 1-2mol / L is added, and the pH value is stable in the range of 3-4. The stoichiometric model in S3 is:

[0015] Ca 2+ is the amount of substance of the calcium ion to be added, n(F - ) is the amount of substance of the fluoride ion in the wastewater.

[0016] Calcium chloride (CaCl2) is used as the source of calcium ions. Since calcium chloride completely ionizes into 1 calcium ion and 2 chloride ions in water, i.e. 1 mol of calcium chloride provides 1 mol of calcium ion, the amount of substance of calcium chloride to be added is:

[0017] wherein the volume of the wastewater is V, and the concentration of the fluoride ion detected by the fluoride ion concentration detector is C(F - ).

[0018] Preferably, in S3, the concentration of calcium chloride is generally 0.5-1mol / L, and the metering ratio of the addition amount ensures that the fluoride ion and the calcium ion react in a molar ratio of 1:1, and the reaction temperature is maintained at 20℃-30℃.

[0019] Another object of the present application is to provide a sludge treatment device, comprising: a frame, a conveying roller structure and an output roller structure are respectively arranged on the upper and lower sides of the frame, and a first filter pressing belt of the conveying roller structure and a second filter pressing belt of the output roller structure are arranged in a wave shape at the middle part of the frame.

[0020] One end of the frame is internally provided with a cleaning structure for cleaning the first filter pressing belt, the cleaning structure comprises a movable groove, the movable groove is opened on the side wall of the frame, and a movable block is slidably arranged in the movable groove.

[0021] The top of the movable groove is provided with a vertical rod hole, a movable rod vertically penetrates the rod hole, the top end of the movable rod is fixed with a supporting plate, the top of the supporting plate is vertically fixed with a positioning rod, the outer part of the positioning rod is sleeved with a counterweight, and the counterweight is stacked above the supporting plate.

[0022] Two movable blocks vertically sliding are arranged at the same position on both sides of the frame, an air inlet pipe is fixed between the two movable blocks, a gas outlet is installed on the circumferential surface of the supporting plate, and the air holes of the gas outlet are arranged downwards.

[0023] One of the movable blocks is provided with a connecting hole, and one of the movable blocks is connected with a connecting pipe in communication with the connecting hole.

[0024] According to the further scheme of the present application, the bottom side of one of the movable blocks is fixed with a pressure switch, and the bottom groove wall of the movable groove is fixed with a pressing head, which is located directly below the pressure switch.

[0025] A constant pressure air pump is installed on the outer wall of the frame, the constant pressure air pump is connected with the movable block through the air inlet pipe, and a constant pressure valve is installed on the air inlet pipe.

[0026] According to the further scheme of the present application, the outer side of the frame is fixed with a mounting plate, the central position of the mounting plate is installed with a warning light, the periphery of the mounting plate is equipped with an indicator light, and the warning light is connected in series with the pressure switch.

[0027] According to the further scheme of the present application, the air inlet pipe is located above the inner wall at the bottom of the first filter belt in the conveying roller pressing structure, and the bottom side edge of the air outlet is tightly attached to the bottom inside of the first filter belt.

[0028] Supporting plates are further fixed between the two side walls of the frame, a plurality of pressure detection structures are installed side by side on the top side of the supporting plates, the pressure detection structure comprises a movable cylinder, a second electrode is fixed at the bottom of the movable cylinder, a movable rod is movably inserted into the top of the movable cylinder, a first electrode is fixed at the bottom end of the movable rod, and a spring with a vertical axis is fixed at the bottom of the first electrode.

[0029] A first electrode is fixed at the bottom center position of the movable rod, and the diameters of the first electrode and the second electrode are smaller than that of the spring.

[0030] An inclined force plate is fixed at the top of the movable rod, the force plate is located below the bottom outer wall of the first filter belt, and the force plate is also located below the air outlet of the air outlet.

[0031] The first electrode and the second electrode in each pressure detection structure are respectively connected with a corresponding indicator light and connected to a power supply.

[0032] The controller is installed on the outer side of the frame and is used to receive signals of the warning light and the indicator light.

[0033] As a further scheme of the present application, the conveying and rolling structure comprises a first conveying motor, a first filter pressing belt, a flow resistance plate, a first-stage extrusion roller, a first matching roller, a first transmission roller and a supporting roller.

[0034] The first filter pressing belt is installed outside the first matching roller and the first transmission roller, and the first filter pressing belt has a pre-tightening force with the first matching roller and the first transmission roller.

[0035] A plurality of supporting rollers are installed in parallel along a straight line between the first matching roller and the first transmission roller, and the supporting rollers are located below the upper inner wall of the first filter pressing belt, and the roller surface of the supporting roller is attached to the upper inner wall of the first filter pressing belt.

[0036] Three first-stage extrusion rollers are installed in parallel below the supporting rollers, and the first-stage extrusion rollers are located above the lower inner wall of the first filter pressing belt.

[0037] The conveying and rolling structure further comprises a flow resistance plate, which is fixed between the inner walls of the two sides of the frame, and the flow resistance plate is located above the upper outer wall of the first filter pressing belt.

[0038] A first conveying motor is installed on the outer wall of one side of the frame, and the first conveying motor is used to drive the first transmission roller.

[0039] As a further scheme of the present application, the output rolling structure comprises a second conveying motor, a second filter pressing belt, a second-stage extrusion roller, a second transmission roller and a second matching roller, wherein the second transmission roller and the second matching roller are rotatably installed at the lower ends of the frame, the second filter pressing belt is installed outside the second transmission roller and the second matching roller, the second filter pressing belt has a pre-tightening force with the second transmission roller and the second matching roller, two second-stage extrusion rollers are installed in parallel in the middle of the frame, and the second-stage extrusion rollers are located at the bottom side of the upper inner wall of the second filter pressing belt.

[0040] The second-stage extrusion rollers and the first-stage extrusion rollers are arranged in an up-down staggered manner, and the second filter pressing belt and the first filter pressing belt sections between the second-stage extrusion rollers and the first-stage extrusion rollers are wavy.

[0041] One end of the frame is provided with a flow guide plate, the flow guide plate is located at the bottom side of the first transmission roller, and the bottom position of the flow guide plate is above the second transmission roller.

[0042] As a further scheme of the present application: the top of the frame is provided with fixed rods, the fixed rods are fixed with connecting rods, the bottom of the connecting rods is fixed with flow splitting cones, and the bottom side of the flow splitting cones is tangent to the upper surface of the upper part of the first filter belt.

[0043] The frame is fixed with flow limiting baffles between the two side walls of the top, the flow limiting baffles are located above the upper surface of the upper part of the first filter belt, and the flow limiting baffles are located near one end of the first transmission roller.

[0044] The inside of the frame is provided with two layers of receiving plates, the first receiving plate is located between the first extrusion roller and the supporting roller, and the two ends start between the first matching roller and the first transmission roller, the second receiving plate is located below the second extrusion roller, and the two ends start between the second transmission roller and the second matching roller, and a drainage opening is formed in the side of the frame, and the drainage opening is located above the receiving plate.

[0045] One end of the frame is fixed with a discharge plate, and the discharge plate is located below the first transmission roller.

[0046] The top of the flow limiting plate is fixed with a supporting frame, the supporting frame is connected with a feeding pipe, and the water outlet port of the feeding pipe is located between the flow limiting baffle and the flow limiting plate.

[0047] The controller is used for starting and stopping control of the first conveying motor, the second conveying motor and the constant pressure air pump.

[0048] The beneficial effects of the present application are:

[0049] The process introduces oxygen-containing fluorine wastewater into a fine control acidic solution environment, and by means of precise temperature and time parameter control, in combination with accurate dosing of soluble calcium salt in stoichiometric ratio, calcium fluoride is induced to precipitate efficiently, and the pH value of raw water is accurately and greatly reduced.

[0050] The wastewater mixture is subjected to preliminary solid-liquid separation through the first filter belt, and the clear liquid in the wastewater automatically penetrates and falls down, and the waste liquid after preliminary filtration is continuously conveyed on the first filter belt, and is turned to the second filter belt through the flow guide plate, and the first filter belt and the second filter belt are subjected to extrusion under the action of the second extrusion roller and the first extrusion roller, so as to further reduce the water content in the sludge, and the two-stage filter structure effectively improves the dewatering effect of the sludge, and finally the calcium fluoride sludge with low water content is prepared, and the quality of the sludge and the efficiency of subsequent treatment are improved.

[0051] With the first filter press belt is gradually stretched and lengthened in the process of use, the pressing position of the air inlet pipe is gradually lowered, and the movable blocks on both sides slide downward, when the movable blocks slide to the lowest end, the extrusion head will extrude the pressure switch, so that the indicating lamp connected with the pressure switch is in the energized state, the warning light is on, prompting the operator that the first filter press belt is stretched state exceeds the maximum expansion amount, the filter press belt needs to be replaced, the expansion amount of the filter press belt is monitored in real time, and timely alarm is sent to remind the operator to replace the filter press belt, avoid equipment damage and filter effect decline, improve the safety and reliability of the equipment operation, through the gas provided by the constant pressure air pump, the filter holes of the first filter press belt are blown and cleaned through the air inlet pipe and the air outlet, the residual waste residue is blown out from the filter holes, avoiding the filter hole blockage, the gas blowing and cleaning mode can effectively prevent the filter hole blockage, prolong the service life of the filter press belt, and reduce the frequency and labor intensity of manual cleaning.

[0052] Through the cooperation of the movable rod, the first electrode and the second electrode, the water permeation state of the first filter press belt is detected, after the air outlet blows, the wind force passes through the first filter press belt, the wind force pressure generated acts on the stress plate, the movable rod descends, the first electrode contacts the second electrode, the corresponding indicating lamp is electrified and flashes, and the signal is transmitted to the controller, the cleaning effect is detected in real time, and the filter press belt always maintains good filtering performance, and the reliability and stability of the equipment operation are improved. BRIEF DESCRIPTION OF DRAWINGS

[0053] The application will be further described below in combination with the drawings.

[0054] Figure 1 It is a first perspective structural schematic view of the sludge treatment device in the application.

[0055] Figure 2 It is a second perspective structural schematic view of the sludge treatment device in the application.

[0056] Figure 3 It is a schematic view of the arrangement position of the pressure detection structure.

[0057] Figure 4 It is a half-section perspective structural schematic view of the sludge treatment device in the application.

[0058] Figure 5 It is a sectional view position structural schematic view of the pressure detection structure.

[0059] Figure 6 It is Figure 5 the structure diagram of area A in the application.

[0060] Figure 7 It is Figure 2 the structure diagram of area B in the application.

[0061] Figure 8 It is a preparation process flow chart of the application.

[0062] Figure: 1, frame machine, 2, first conveying motor, 3, support frame, 4, second conveying motor, 5, discharge plate, 6, first filter press belt, 7, second filter press belt, 8, feeding pipe, 9, flow limiting baffle, 10, flow resistance plate, 11, fixed rod, 12, flow dividing cone, 13, connecting rod, 14, flow guide plate, 15, two-stage extrusion roller, 16, first-stage extrusion roller, 17, warning light, 18, indicator light, 19, mounting plate, 20, constant pressure valve, 21, cleaning structure, 22, air inlet pipe, 23, controller, 24, constant pressure air pump, 26, first matching roller, 27, first transmission roller, 28, support roller, 29, second transmission roller, 30, second matching roller, 31, support plate, 32, air outlet, 33, air inlet pipe, 34, pressure receiving detection structure, 211, movable groove, 212, connecting pipe, 213, extrusion head, 214, pressure receiving switch, 215, movable block, 216, movable rod, 217, counterweight block, 218, positioning rod, 219, support backing plate, 341, first electrode, 342, movable cylinder, 343, spring, 344, second electrode, 345, movable rod, 346, force receiving plate. DETAILED DESCRIPTION

[0063] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the protection scope of the present application.

[0064] Please refer to Figure 8 As shown in the figure, a topcon battery fluorine-containing wastewater calcium fluoride sludge treatment process based on a double-layer printing process includes the following steps:

[0065] S1: wastewater pretreatment. The fluorine-containing wastewater generated in various photovoltaic production processes is collected into a conditioning tank, a stirring device is turned on, and the wastewater is fully mixed to achieve the effect of homogeneity and uniformity.

[0066] S2: precise pH value control. The wastewater is lifted from the conditioning tank to the acidification reaction unit, a high-precision pH meter is used to monitor the pH value of the wastewater in real time, dilute sulfuric acid is added according to the initial pH value and the target acidity range, the addition process uses an automatic control system, a peristaltic pump is used, the sulfuric acid flow is adjusted in real time according to the feedback signal of the pH meter, and the pH value is ensured to stably decrease. Under this acidity condition, the activity of fluoride ions is significantly improved, laying a foundation for the subsequent efficient reaction with calcium ions. During the control process, the reaction temperature is 25-35℃, and the acidification reaction is fully completed.

[0067] S3: Precipitation efficient production. The acidified wastewater flows into the precipitation reactor, according to the data of the online fluorine ion concentration detector, combined with the stoichiometric model, through the automatic control program, the soluble calcium chloride solution is accurately added for sufficient contact reaction, the water bath heating or the built-in serpentine coil is used for accurate temperature control, the uniform reaction system temperature is ensured, the sufficient growth and maturation time is given to the precipitation particles, in the reaction process, slow stirring is used to promote the gradual aggregation and growth of the small calcium fluoride crystal nucleus in the wastewater, and the precipitation particles with uniform particle size and easy settlement are formed.

[0068] S4: Fine separation of sludge. The mixed liquid after the precipitation reaction is sent to the sludge treatment device for solid-liquid separation. Before sludge preparation, the sludge is conditioned, and an appropriate amount of flocculating agent such as polyacrylamide is added to the mixed liquid to make the small calcium fluoride precipitation particles aggregate into larger flocs, improve the pressure filtration effect, and realize the efficient separation of sludge and liquid through the sludge treatment device.

[0069] S5: Drying. The output calcium fluoride sludge is dried by using a dryer, and dry calcium fluoride sludge is obtained. When the water content is reduced to 5%-10%, the material is discharged in time to obtain high-quality calcium fluoride sludge products, which are convenient for long-term storage and transportation, and realize the perfect conversion of fluorine-containing wastewater to high-purity calcium fluoride products.

[0070] In S1, the residence time of the adjustment tank is set according to the wastewater production and the load capacity of the subsequent treatment unit, and the residence time is 1-3h. In S2, according to the initial pH value and the target acidity range, dilute sulfuric acid with a concentration of 1-2mol / L is added, and the pH value stable interval is 3-4. The stoichiometric model in S3 is:

[0071] Ca 2+ n(Ca) is the amount of substance of calcium ions to be added, n(F - ) is the amount of substance of fluorine ions in the wastewater.

[0072] Calcium chloride (CaCl2) is used as the source of calcium ions. Since calcium chloride completely ionizes into 1 calcium ion and 2 chloride ions in water, that is, 1 mol of calcium chloride provides 1 mol of calcium ion, the amount of substance of calcium chloride to be added is:

[0073] Wherein, the volume of wastewater is V, and the concentration of fluorine ions detected by the fluorine ion concentration detector is C(F - ).

[0074] In S3, the concentration of calcium chloride is generally 0.5-1mol / L, and the metering ratio of the addition amount is ensured to ensure that the fluorine ion and the calcium ion are in a 1:1 molar ratio, and the reaction temperature is maintained at 20℃-30℃.

[0075] Referring to Figures 1-7 As shown in the figure, a sludge treatment device for topcon cell fluorine-containing wastewater calcium fluoride sludge treatment based on a double-layer printing process includes a frame machine 1, a conveying roller structure and an output roller structure are respectively arranged on the upper and lower sides of the frame machine 1, and a first filter pressing belt 6 of the conveying roller structure and a second filter pressing belt 7 of the output roller structure are arranged in a wave shape at the middle part of the frame machine 1.

[0076] Referring to Figure 2 As shown in the figure, a cleaning structure 21 for cleaning the first filter pressing belt 6 is arranged at one end of the frame machine 1, the cleaning structure 21 includes a movable groove 211, the movable groove 211 is arranged on the side wall of the frame machine 1, a movable block 215 is slidably arranged in the movable groove 211, and the two side walls of the movable block 215 are gap-fitted with the two vertical groove walls of the movable groove 211. The sliding fit of the two movable blocks 215 can ensure the smooth movement of the air inlet pipe 33 and have a pressing effect on the inner side of the first filter pressing belt 6.

[0077] Referring to Figure 7 As shown in the figure, a vertical rod hole is arranged at the top of the movable groove 211, a movable rod 216 vertically penetrates the rod hole, a supporting plate 219 is fixed at the top end of the movable rod 216, a positioning rod 218 is vertically fixed at the top of the supporting plate 219, a counterweight 217 is sleeved on the outside of the positioning rod 218, and the counterweight 217 is stacked above the supporting plate 219. By arranging the counterweight 217 with the same grammage on the supporting plate 219, the same force can be applied during the stretching and tensioning of the first filter pressing belt 6, which can effectively ensure the tensioning effect of the first filter pressing belt 6.

[0078] Two movable blocks 215 that can vertically slide are arranged at the same position on both sides of the frame machine 1, an air inlet pipe 33 is fixed between the two movable blocks 215, an air outlet 32 is arranged on the circumferential surface of the supporting plate 31, and the air holes of the air outlet 32 are arranged downward. During the downward pushing process of the air inlet pipe 33, the first filter pressing belt 6 can be tensioned, the air outlet 32 can be tightly attached to the inner side of the first filter pressing belt 6, the first filter pressing belt 6 can be cleaned by air blowing under the tensioning state, and the air overflow can be avoided to affect the cleaning effect of the filter holes.

[0079] One of the movable blocks 215 is provided with a connecting hole, and one of the movable blocks 215 is connected with a connecting pipe 212, and the connecting pipe 212 communicates with the connecting hole.

[0080] One of the bottom side of the movable block 215 is fixed with a pressure switch 214, the bottom groove wall of the movable groove 211 is fixed with a pressing head 213, the pressing head 213 is located directly below the pressure switch 214, because the first filter belt 6 has a certain amount of expansion, the length of the first filter belt 6 is greater than the maximum expansion amount, which will cause the filter to fail or easily break down during operation, affecting the filtering effect, the maximum expansion amount of the first filter belt 6 needs to be monitored, as the first filter belt 6 is gradually stretched and lengthened during use, the pressing position of the air inlet pipe 33 also gradually decreases, when the air inlet pipe 33 is lowered, the movable block 215 on both sides slides downward, when the movable block 215 slides to the lowest end, the pressing head 213 will press the pressure switch 214, so that the indicating lamp 18 connected with the pressure switch 214 is in an energized state, when the indicating lamp 18 is powered on, it indicates that the first filter belt 6 is stretched beyond the maximum expansion amount, and the first filter belt 6 needs to be replaced to ensure the filtering effect and the safety of equipment operation.

[0081] As shown in Figure 1 The outer wall of the frame machine 1 is provided with a constant pressure air pump 24, the constant pressure air pump 24 is connected with the movable block 215 through the air inlet pipe 22, the air inlet pipe 22 is provided with a constant pressure valve 20, which can ensure the stability of the exhaust, and at the same time, it will not cause additional damage to the first filter belt 6.

[0082] The outer side of the frame machine 1 is fixed with a mounting plate 19, the center of the mounting plate 19 is provided with a warning lamp 17, the periphery of the mounting plate 19 is provided with an indicating lamp 18, and the warning lamp 17 is connected in series with the pressure switch 214.

[0083] As shown in Figures 3-6 The air inlet pipe 33 is located above the inner wall of the bottom of the first filter belt 6 in the conveying roller structure, and the bottom side of the air outlet 32 is tightly attached to the inside of the bottom of the first filter belt 6.

[0084] The two side walls of the frame machine 1 are also fixed with a support plate 31, a plurality of pressure detection structures 34 are installed side by side on the top side of the support plate 31, the pressure detection structure 34 comprises a movable cylinder 342, the bottom of the movable cylinder 342 is fixed with a second electrode 344, the top of the movable cylinder 342 is movably inserted with a movable rod 345, the bottom end of the movable rod 345 is fixed with a first electrode 341, and the bottom of the first electrode 341 is fixed with a spring 343 with a vertical axis.

[0085] The bottom center of the movable rod 345 is fixed with the first electrode 341, and the diameters of the first electrode 341 and the second electrode 344 are smaller than the spring 343.

[0086] The top of the movable rod 345 is fixed with an inclined force plate 346, which is located below the bottom outer wall of the first filter belt 6 and below the air outlet of the exhaust port 32. Since the force plate 346 is inclined, it is also convenient to guide the waste falling on the force plate 346 in time under the cooperation of the wind force.

[0087] The first electrode 341 and the second electrode 344 in each pressure detection structure 34 are respectively connected with one corresponding indicator lamp 18 and are connected to the power supply.

[0088] The controller 23 is installed on the outside of the frame machine 1, which is used to receive the signals of the warning lamp 17 and the indicator lamp 18.

[0089] In order to better determine the cleaning effect on the first filter belt 6, the water permeability of the first filter belt 6 is detected by the pressure detection structure 34. In the case that the first filter belt 6 can ensure the water permeability, the first filter belt 6 has the air permeability. When the filter holes in the first filter belt 6 are cleaned, the exhaust port 32 is used to blow air to clean the residual waste in the first filter belt 6. After the residual waste in the first filter belt 6 is cleaned, the first filter belt 6 has better air permeability.

[0090] After blowing through the exhaust port 32, the wind force generated can pass through the first filter belt 6, and the wind force pressure acts on the force plate 346 in the pressure detection structure 34 to generate a downward pressure, which can push the movable rod 345 downward to realize the extrusion of the first electrode 341. After the first electrode 341 is contracted, it generates a rebound reset force. After the force plate 346 is blown by the exhaust port 32, the wind force generated, the first electrode 341 at the bottom of the movable rod 345 contacts the second electrode 344 after the movable rod 345 descends, and the corresponding indicator lamp 18 can be electrified and bright. Its bright signal is transmitted to the controller 23. Since the wind force blown through the exhaust port 32 is more than twice the reaction force of the spring 343, when the filter holes in the first filter belt 6 form regional blockage, and after the exhaust port 32 is blown, the filter holes in the first filter belt 6 are cleaned.

[0091] Please refer to Figure 4 The conveying roller pressing structure includes a first conveying motor 2, a first filter belt 6, a flow resistance plate 10, a first-stage extrusion roller 16, a first matching roller 26, a first transmission roller 27 and a supporting roller 28. The first matching roller 26 and the first transmission roller 27 are respectively rotatably installed at the top of the frame machine 1.

[0092] The first filter belt 6 is matchedly installed outside the first matching roller 26 and the first transmission roller 27, and the first filter belt 6 has a pre-tightening force with the first matching roller 26 and the first transmission roller 27. When the first filter belt 6 is driven, the first matching roller 26 and the first transmission roller 27 can effectively drive the first filter belt 6.

[0093] A plurality of supporting rollers 28 are installed in parallel along a straight line between the first matching roller 26 and the first transmission roller 27, and the supporting rollers 28 are located below the upper inner wall of the first filter belt 6, the roller surface of the supporting rollers 28 is attached to the upper inner wall of the first filter belt 6, which can lift the first filter belt 6 carrying the wastewater mixture, and avoid the stress deformation of the first filter belt 6.

[0094] Three primary extrusion rollers 16 are installed in parallel below the supporting rollers 28, and the primary extrusion rollers 16 are located above the lower inner wall of the first filter belt 6. Through the operation of the three primary extrusion rollers 16, the extrusion dewatering operation of the sludge can be realized.

[0095] Please refer to Figure 4 The conveying roller pressure structure further comprises a flow resistance plate 10, which is fixed between the inner walls on both sides of the frame machine 1, and the flow resistance plate 10 is located above the upper outer wall of the first filter belt 6.

[0096] A first conveying motor 2 is installed on one side outer wall of the frame machine 1, and the first conveying motor 2 is used to drive the first transmission roller 27.

[0097] In use, the first transmission roller 27 can be driven by the driving operation of the first conveying motor 2, and the first filter belt 6 can be driven under the cooperation of the first matching roller 26. In the preliminary bearing area, the wastewater mixture falls above the upper part of the first filter belt 6, and the first filter belt 6 part bearing the wastewater mixture on the upper part can be supported and cooperated by the supporting cooperation of the plurality of supporting rollers 28, so as to realize the bearing of the wastewater mixture. During the conveying process of the wastewater mixture in this section, the wastewater on the first filter belt 6 is automatically separated into solid and liquid, and the wastewater clear liquid is automatically infiltrated and falls down, realizing the preliminary solid-liquid separation of the wastewater mixture.

[0098] Please refer to Figure 4As shown, the output roller structure includes a second conveying motor 4, a second filter pressing belt 7, a second-stage extrusion roller 15, a second transmission roller 29 and a second matching roller 30, wherein the second transmission roller 29 and the second matching roller 30 are respectively rotatably installed at the lower two end positions of the frame machine 1, the second filter pressing belt 7 is matchedly installed outside the second transmission roller 29 and the second matching roller 30, and the second filter pressing belt 7 has a pre-tightening force for the second transmission roller 29 and the second matching roller 30, which can ensure the transmission of the second transmission roller 29 and the second matching roller 30 to the second filter pressing belt 7 when the second filter pressing belt 7 is driven.

[0099] The middle part of the frame machine 1 is provided with two second-stage extrusion rollers 15 which are located at the inner wall bottom of the upper part of the second filter pressing belt 7.

[0100] In use, the second transmission roller 27 can be driven by the operation of the second conveying motor 4, and the rotation of the second filter pressing belt 7 can be realized under the cooperation of the second matching roller 26. After the preliminary solid-liquid filtration separation is completed through the conveying of the first filter pressing belt 6, the waste liquid which has completed the preliminary filtration is guided and turned over by the guide plate 14 and falls on the second filter pressing belt 7 to realize the second-stage filter pressing process. After the conveying of the second filter pressing belt 7, the top surface of the second filter pressing belt 7 and the bottom surface of the first filter pressing belt 6 gradually approach each other for extrusion.

[0101] When the first filter pressing belt 6 and the second filter pressing belt 7 synchronously enter the wave section formed by the second-stage extrusion roller 15 and the first-stage extrusion roller 16, the waste which has completed the preliminary solid-liquid separation is extruded and drained due to the extrusion interval between the second-stage extrusion roller 15 and the first-stage extrusion roller 16. After the extrusion and drainage are completed, the sludge which has discharged the clear liquid is extruded and filtered. After the extrusion and filtration are completed, the dewatered sludge is continuously conveyed by the second filter pressing belt 7 to realize the preparation of the calcium fluoride sludge.

[0102] The second-stage extrusion roller 15 and the first-stage extrusion roller 16 are arranged in an up-down staggered manner, and the sections of the second filter pressing belt 7 and the first filter pressing belt 6 between the second-stage extrusion roller 15 and the first-stage extrusion roller 16 are wave-shaped. Through the cooperation of the first-stage extrusion roller 16 and the second-stage extrusion roller 15, the extrusion through the second filter pressing belt 7 and the first filter pressing belt 6 can be realized to extrude and drain the waste liquid.

[0103] One end of the frame machine 1 is provided with a guide plate 14 which is located at the bottom side of the first transmission roller 27 and has its bottom position above the second transmission roller 29. The guide plate 14 can guide and reverse the waste liquid which is conveyed by the first filter pressing belt 6 to output the waste liquid to the second filter pressing belt 7.

[0104] The top of the frame machine 1 is provided with fixed rods 11, the fixed rods 11 are fixedly connected with connecting rods 13, the bottom of the connecting rods 13 is fixedly connected with flow splitting cones 12, the bottom side of the flow splitting cones 12 is tangent to the upper surface of the upper part of the first filter belt 6. The flow splitting cones 12 on two adjacent fixed rods 11 are arranged in staggered manner along the rolling direction of the first filter belt 6, so as to split and spread the waste liquid transported by the feeding pipe 8, so as to better filter water and achieve better solid-liquid separation effect.

[0105] The frame machine 1 is fixedly connected with flow limiting baffles 9 between the two side walls of the top, the flow limiting baffles 9 are located above the upper surface of the upper part of the first filter belt 6, and the flow limiting baffles 9 are located close to one end of the first matching roller 26, so as to limit the flow of the input waste liquid.

[0106] Please refer to Figure 4 The frame machine 1 is provided with two layers of receiving plates, the first receiving plate is located between the first extrusion roller 16 and the supporting roller 28, and the two ends start between the first matching roller 26 and the first transmission roller 27, the second receiving plate is located below the second extrusion roller 15, and the two ends start between the second transmission roller 29 and the second matching roller 30, and the frame machine 1 is provided with drainage openings on the side, the drainage openings are located above the receiving plates, so as to drain the waste water generated in different sections.

[0107] Please refer to Figure 4 The bottom side of one end of the frame machine 1 is fixedly connected with a discharging plate 5, the discharging plate 5 is located below the second matching roller 30, so as to output the sludge after the filter pressing and water drainage.

[0108] Please refer to Figure 1 The top of the flow limiting plate 10 is fixedly connected with a supporting frame 3, the supporting frame 3 is connected with the feeding pipe 8, and the water outlet port of the feeding pipe 8 is located between the flow limiting baffle 9 and the flow limiting plate 10, so as to limit the flow of the sewage on one side under the action of the flow limiting plate 10.

[0109] The controller 23 is used for start-stop control of the first conveying motor 2, the second conveying motor 4 and the constant pressure air pump 24, so as to realize the control of the first filter belt 6 and the second filter belt 7, and ensure that the cleaning gas pressure is stable during the use of the cleaning gas to clean the first filter belt 6.

[0110] Working principle: preliminary filtration and conveying of wastewater mixture, the wastewater mixture is conveyed to the first filter belt 6 through the feeding pipe 8, the flow limiting baffle 9 limits the flow of the input waste liquid, so that it is uniformly distributed on the first filter belt 6. The first filter belt 6 starts to drive under the drive of the first conveying motor 2, and the wastewater mixture is conveyed with the first filter belt 6, and the part of the first filter belt 6 carrying the wastewater mixture is supported under the support of the plurality of supporting rollers 28. The solid-liquid separation of the wastewater is automatically realized during the conveying process, and the clear liquid is automatically infiltrated and falls. The waste liquid after preliminary filtration contains part of the solid impurities and continues to be conveyed on the first filter belt 6.

[0111] The waste liquid after preliminary filtration is guided by the flow guide plate 14 and reverses from the first filter belt 6 to the second filter belt 7, preparing for the second stage of the filter pressing process. The second conveying motor 4 drives the second transmission roller 29 to drive the second filter belt 7 to rotate. The first filter belt 6 and the second filter belt 7 synchronously enter the wave section composed of the second-stage extrusion roller 15 and the first-stage extrusion roller 16. The distance between the second-stage extrusion roller 15 and the first-stage extrusion roller 16 is the extrusion distance, and the bottom lower surface of the first filter belt 6 and the top upper surface of the second filter belt 7 gradually approach the extrusion, so as to extrude and drain the waste that has completed the preliminary solid-liquid separation, further reducing the moisture in the sludge.

[0112] The sludge after extrusion and drainage continues to be conveyed on the second filter belt 7, and the continuous conveying of the second filter belt 7 makes the dewatered sludge further dewatered and shaped, and finally prepares calcium fluoride sludge. The prepared calcium fluoride sludge is output through the discharge plate 5 at the bottom of one end of the frame machine 1, and the whole sludge preparation process is completed.

[0113] The cleaning and monitoring of the first filter belt, the cleaning structure 21 arranged inside one end of the frame machine 1 cleans the first filter belt 6. The constant pressure gas pump 24 sends gas to the movable block 215 through the air inlet pipe 22. The gas passes through the connecting pipe 212, the channel inside the movable block 215, and finally reaches the air inlet pipe 33. The air inlet pipe 33 realizes the tensioning of the first filter belt 6 during the downward pushing process, and at the same time ensures that the air outlet 32 is tightly attached to the inner side of the first filter belt 6. The gas is sprayed out of the air outlet 32 to clean the filter holes of the first filter belt 6 by blowing air, so as to blow out the residual waste residue from the filter holes, avoid the filter holes from being blocked, and ensure the filtering performance of the first filter belt 6.

[0114] The pressure detection structure 34 detects the water permeability of the first filter belt 6. After blowing at the air outlet 32, the wind force passes through the first filter belt 6, and the wind force pressure acts on the stress plate 346 in the pressure detection structure 34, so that the movable rod 345 descends, the first electrode 341 contacts the second electrode 344, and the corresponding indicating lamp 18 is electrified and shines. The signal is transmitted to the controller 23 to determine the cleaning effect of the first filter belt 6.

[0115] With the first filter belt 6 being gradually stretched and lengthened in use, the pressing position of the air inlet pipe 33 is gradually lowered, and the movable blocks 215 on both sides slide downward. When the movable blocks 215 slide to the lowest end, the pressing head 213 will press the pressure switch 214, so that the indicating lamp 18 connected with the pressure switch 214 is in an electrified state, the warning lamp 17 is lit, and the operator is prompted that the stretched state of the first filter belt 6 exceeds the maximum expansion amount, and the filter belt needs to be replaced to ensure the filtering effect and the safety of equipment operation.

[0116] The above describes one embodiment of the present application in detail, but the content is only the preferred embodiment of the present application, and cannot be considered as limiting the implementation range of the present application. Any equivalent changes and improvements made according to the scope of the present application should still belong to the patent coverage range of the present application.

Claims

1. A process for treating calcium fluoride sludge from fluoride-containing wastewater from Topcon batteries based on a double-layer printing process, characterized in that, Includes the following steps: S1: Wastewater pretreatment; Fluorine-containing wastewater generated in various photovoltaic production processes is collected and fed into a regulating tank, and the stirring device is turned on to ensure that the wastewater is fully mixed to achieve homogeneity and uniformity. S2: Precise pH control; Wastewater is pumped from the equalization tank to the acidification reaction unit, and a high-precision pH meter is used to monitor the pH value of the wastewater in real time. Dilute sulfuric acid is added according to the initial pH value and the target acidity range. The addition process adopts an automated control system, equipped with a peristaltic pump, and the sulfuric acid flow rate is adjusted in real time according to the pH meter feedback signal to ensure that the pH value drops steadily. Under this acidity condition, the activity of fluoride ions is significantly enhanced, laying the foundation for the subsequent efficient reaction with calcium ions. During the control process, the reaction temperature is between 25℃ and 35℃, and the acidification reaction is fully completed. S3: High-efficiency precipitation generation; acidified wastewater flows into the precipitation reactor. Based on the data from the online fluoride ion concentration detector and combined with the stoichiometric model, soluble calcium chloride solution is precisely added through an automated control program to ensure full contact and reaction. Water bath heating or built-in serpentine coil is used to precisely control the temperature, ensuring uniform temperature of the reaction system and giving the precipitate particles sufficient time to grow and mature. During the reaction, slow stirring promotes the gradual aggregation and growth of tiny calcium fluoride crystal nuclei in the wastewater, forming precipitate particles with uniform particle size that are easy to settle. S4: Fine separation of sludge; The mixed liquid after sedimentation reaction is sent to the sludge treatment device for solid-liquid separation. Before sludge preparation, the sludge is first conditioned and an appropriate amount of flocculant, such as polyacrylamide, is added to the mixed liquid to make the fine calcium fluoride precipitate particles aggregate into larger flocs, thereby improving the filter press effect. The sludge treatment device treats the sewage, achieving efficient separation of sludge and liquid. S5: Drying; The produced calcium fluoride sludge is dried using a dryer to obtain dried calcium fluoride sludge. When the moisture content drops to 5%-10%, it is discharged in time to obtain high-quality calcium fluoride sludge finished product, which is convenient for long-term storage and transportation, and realizes the perfect conversion of fluoride wastewater into high-purity calcium fluoride products.

2. The process for treating calcium fluoride sludge from fluoride-containing wastewater from Topcon batteries based on a double-layer printing process according to claim 1, characterized in that: In step S1, the retention time in the equalization tank is set according to the amount of wastewater generated and the load capacity of the subsequent treatment unit, and the retention time is 1-3 hours; in step S2, dilute sulfuric acid with a concentration of 1-2 mol / L is added according to the initial pH value and the target acidity range, and the pH value is stable in the range of 3-4. The stoichiometric model in S3 is as follows: This refers to the amount of calcium ions that need to be added, n(F). - () represents the amount of fluoride ions in the wastewater; Using calcium chloride (CaCl2) as the source of calcium ions, since calcium chloride completely ionizes in water into 1 calcium ion and 2 chloride ions, meaning that 1 mol of calcium chloride provides 1 mol of calcium ions, the amount of calcium chloride that needs to be added is: The volume of the wastewater is V, and the concentration of fluoride ions detected by the fluoride ion detector is C(F). - ).

3. The process for treating calcium fluoride sludge from fluoride-containing wastewater from Topcon batteries based on a double-layer printing process according to claim 1, characterized in that: In S3, the concentration of calcium chloride is generally 0.5-1 mol / L, and the dosage is stoichiometric to ensure that the molar ratio of fluoride ions to calcium ions is 1:1, and the reaction temperature is maintained at 20℃-30℃.

4. The sludge treatment device for the treatment of calcium fluoride sludge from fluoride-containing wastewater from Topcon batteries based on a double-layer printing process, as described in claim 1, is characterized in that... include: The frame machine (1) has a conveying roller pressing structure and an output roller pressing structure installed on its upper and lower sides respectively. The first filter belt (6) of the conveying roller pressing structure and the second filter belt (7) of the output roller pressing structure are arranged in a wave-like manner in the middle of the frame machine (1). The frame machine (1) is provided with a cleaning structure (21) for cleaning the first filter belt (6) at one end. The cleaning structure (21) includes a movable groove (211). The movable groove (211) is opened on the side wall of the frame machine (1). A movable block (215) is slidably arranged inside the movable groove (211). The two side walls of the movable block (215) are fitted with the two side vertical groove walls of the movable groove (211) with a gap. The top of the movable groove (211) is provided with a vertical rod hole, through which a movable rod (216) passes vertically. A support plate (219) is fixed at the top of the movable rod (216), and a positioning rod (218) is fixed vertically at the top of the support plate (219). A counterweight (217) is fitted on the outside of the positioning rod (218), and the counterweight (217) is stacked on top of the support plate (219). Two movable blocks (215) that can slide vertically are respectively set at the same position on both sides of the frame machine (1). An air inlet pipe (33) is fixed between the two movable blocks (215). An exhaust port (32) is installed on the circumferential surface of the support plate (31). The air hole of the exhaust port (32) is set downward. One of the movable blocks (215) is provided with a connection hole, and a connecting pipe (212) is connected to one of the movable blocks (215), and the connecting pipe (212) communicates with the connection hole.

5. The sludge treatment device according to claim 4, characterized in that, A pressure switch (214) is fixed to the bottom side of one of the movable blocks (215), and a pressing head (213) is fixed on the bottom wall of the movable groove (211), with the pressing head (213) located directly below the pressure switch (214). A constant pressure air pump (24) is installed on the outer wall of the frame machine (1). The constant pressure air pump (24) is connected to the movable block (215) through the air inlet pipe (22). A constant pressure valve (20) is installed on the air inlet pipe (22).

6. The sludge treatment device according to claim 4, characterized in that, An installation plate (19) is fixed on the outside of the frame machine (1). A warning light (17) is installed at the center of the installation plate (19). An indicator light (18) is assembled around the installation plate (19). The warning light (17) is connected in series with the pressure switch (214).

7. The sludge treatment apparatus according to claim 4, characterized in that, The air inlet pipe (33) is located above the bottom inner wall of the first filter belt (6) in the conveying roller pressing structure, and the bottom side of the exhaust port (32) is in close contact with the bottom interior of the first filter belt (6). A support plate (31) is fixed between the two side walls of the frame machine (1). Multiple pressure detection structures (34) are installed side by side on the top side of the support plate (31). The pressure detection structure (34) includes a movable cylinder (342). A second electrode (344) is fixed at the bottom of the movable cylinder (342). A movable rod (345) is movably inserted at the top of the movable cylinder (342). A first electrode (341) is fixed at the bottom of the movable rod (345). A spring (343) with a vertical axis is fixed at the bottom of the first electrode (341). The bottom center of the movable rod (345) is fixed with a first electrode (341), and the diameters of the first electrode (341) and the second electrode (344) are both smaller than the spring (343). An inclined force plate (346) is fixed to the top of the movable rod (345). The force plate (346) is located below the bottom outer wall of the first filter belt (6), and the force plate (346) is also located below the air outlet of the exhaust port (32). The first electrode (341) and the second electrode (344) in each pressure detection structure (34) are respectively connected to an indicator light (18) and connected to a power supply; A controller (23) is installed on the outside of the frame (1), and the controller (23) is used to receive signals from the warning light (17) and the indicator light (18).

8. The sludge treatment device according to claim 4, characterized in that, The conveying roller pressing structure includes a first conveying motor (2), a first filter belt (6), a baffle plate (10), a first-stage extrusion roller (16), a first cooperating roller (26), a first transmission roller (27), and a support roller (28); wherein the first cooperating roller (26) and the first transmission roller (27) are respectively rotatably installed at the top two ends of the frame machine (1); The first filter belt (6) is matched and installed outside the first mating roller (26) and the first drive roller (27), and the first filter belt (6) has a pre-tension force with the first mating roller (26) and the first drive roller (27); A plurality of support rollers (28) are installed in parallel along a straight line between the first mating roller (26) and the first drive roller (27), and the support rollers (28) are located below the upper inner wall of the first filter belt (6), and the roller surface of the support rollers (28) is in contact with the upper inner wall of the first filter belt (6). Three primary extrusion rollers (16) are installed side by side below the support roller (28), and the primary extrusion rollers (16) are located above the lower inner wall of the first filter belt (6); The conveying roller pressing structure also includes a flow-blocking plate (10), which is fixed between the inner walls of both sides of the frame machine (1) and is located above the upper outer wall of the first filter belt (6). A first conveyor motor (2) is installed on one side of the outer wall of the frame machine (1), and the first conveyor motor (2) is used to drive the first transmission roller (27).

9. The sludge treatment apparatus according to claim 4, characterized in that, The output roller pressing structure includes a second conveyor motor (4), a second filter belt (7), a secondary extrusion roller (15), a second drive roller (29), and a second mating roller (30). The second drive roller (29) and the second mating roller (30) are rotatably installed at the lower ends of the frame machine (1). The second filter belt (7) is matched and installed outside the second drive roller (29) and the second mating roller (30). The second filter belt (7) has a pre-tension force on the second drive roller (29) and the second mating roller (30). Two secondary extrusion rollers (15) are installed side by side in the middle of the frame machine (1). The secondary extrusion rollers (15) are located on the bottom side of the upper inner wall of the second filter belt (7). The secondary extrusion roller (15) and the primary extrusion roller (16) are staggered vertically, and the second filter belt (7) and the first filter belt (6) section between the secondary extrusion roller (15) and the primary extrusion roller (16) are wavy. One end of the frame machine (1) is provided with a guide plate (14), which is located on the bottom side of the first transmission roller (27) and the bottom of the guide plate (14) is above the second transmission roller (29).

10. The sludge treatment apparatus according to claim 4, characterized in that, The top of the frame machine (1) is equipped with fixed rods (11) arranged in parallel. A connecting rod (13) is fixed on the fixed rod (11). A diverting cone (12) is fixed at the bottom of the connecting rod (13). The bottom side of the diverting cone (12) is tangent to the upper surface of the first filter belt (6). The diverting cones (12) on two adjacent fixed rods (11) are staggered along the rolling direction of the first filter belt (6). A flow-limiting baffle (9) is fixed between the top two side walls of the frame machine (1). The flow-limiting baffle (9) is located above the upper surface of the first filter press belt (6), and the flow-limiting baffle (9) is located at one end close to the first drive roller (27). The frame machine (1) is equipped with two layers of receiving plates. The first receiving plate is located between the first-stage extrusion roller (16) and the support roller (28), and its two ends start between the first cooperating roller (26) and the first transmission roller (27). The second receiving plate is located below the second-stage extrusion roller (15), and its two ends start between the second transmission roller (29) and the second cooperating roller (30). Drainage outlets are provided on the side of the frame machine (1), and the drainage outlets are located above the receiving plates. A discharge plate (5) is fixed to the bottom side of one end of the frame machine (1), and the discharge plate (5) is located below the first transmission roller (27); The top of the flow-blocking plate (10) is fixed with a support frame (3), and a feeding pipe (8) is connected to the support frame (3). The water outlet of the feeding pipe (8) is located between the flow-limiting baffle (9) and the flow-blocking plate (10). The controller (23) is used for the start and stop control of the first conveyor motor (2), the second conveyor motor (4) and the constant pressure air pump (24).

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