Deep defluorination device for sludge

Abstract

The utility model discloses a deep defluorination device for sludge. The deep defluorination device comprises a coagulating basin, a sludge feed port, a medicament feeding mechanism, a stirrer, a muddy water conveying pipeline, a sedimentation basin, a water discharge port, a sludge discharge port, a muddy water diffusion spray head, a sludge return pipeline and a separation screen, through the mode, according to the deep fluorine removal device for the sludge, disclosed by the utility model, the medicament is uniformly added and stirred, so that the sludge and the medicament are fully reacted for removing fluorine, and the sludge is refluxed according to a ratio for secondary fluorine removal and deep removal of fluorine ions in the sludge, so that the concentration of the fluorine ions in water discharged from the sedimentation tank is stably lower than 1mg / L; the defluorination efficiency and the defluorination effect of the sludge are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to sludge treatment technical field especially is related to a sludge depth defluorination device. BACKGROUND

[0002] Fluorine-containing sludge usually comes from chemical plants, metallurgical plants and mines etc., is one of the dangerous wastes which are toxic and harmful, and a large number of fluoride ions can cause great harm to the environment and human health, need timely processing. However, the treatment effect of the fluorine-containing sludge treatment equipment is very unsatisfactory, and the efficiency is low, does not meet the demand of high efficiency, safety and environmental protection. UTILITY MODEL CONTENT

[0003] To solve the above technical problem, one technical scheme adopted by the utility model is:

[0004] Provide a kind of sludge depth defluorination device, it includes: coagulation tank, sludge feed port, reagent feeding mechanism, agitator, sludge-water conveying pipeline, sedimentation tank, drain, sludge outlet, sludge diffusion spray head, sludge backflow pipeline, separation screen, the bottom of the coagulation tank is provided with the sludge feed port, the reagent feeding mechanism is set to the upper portion of coagulation tank, the agitator can be rotatably set in coagulation tank,

[0005] The reagent feeding mechanism includes acid-base adjusting reagent bin, coagulation reagent bin, defluorination reagent bin, reagent feeding pipeline, reagent outlet, reagent export slope, the acid-base adjusting reagent bin, the coagulation reagent bin and the defluorination reagent bin are sequentially arranged on the inner wall or top surface of the coagulation tank, several reagent feeding pipelines for conveying acid-base adjusting reagent, flocculation coagulation reagent or defluorination reagent are respectively communicated with corresponding reagent bin, the sidewall of the acid-base adjusting reagent bin, the coagulation reagent bin and the defluorination reagent bin is provided with the reagent outlet, the reagent export slope is provided in each reagent bin, the reagent export slope extends to the reagent outlet obliquely, and the width of the reagent export slope gradually increases along the outflow direction of reagent, so that reagent is diffused and sprayed outward under the action of reagent export slope,

[0006] One end of the sludge-water conveying pipeline is connected to the upper portion of the coagulation tank, the other end extends into the sedimentation tank and is connected with the sludge diffusion spray head, the upper portion of the sedimentation tank is provided with the drain for outputting supernatant, and the lower portion is provided with the sludge outlet, one end of the sludge backflow pipeline is arranged in the sedimentation tank below the sludge diffusion spray head, the other end extends to the lower portion in the coagulation tank to backflow the sludge in the sedimentation tank to the coagulation tank for secondary defluorination, the separation screen is arranged in the sedimentation tank above the sludge diffusion spray head and below the drain to separate sludge and water.

[0007] In a preferred embodiment of the present invention, sensors for detecting the liquid level of sludge or mud-water mixture are provided in the coagulation tank and the sedimentation tank.

[0008] In a preferred embodiment of the present invention, the agent feeding pipe for conveying the acid-base regulating agent is connected to the acid-base regulating agent warehouse, the agent feeding pipe for conveying the flocculation and coagulation agent is connected to the coagulation agent warehouse, and the agent feeding pipe for conveying the defluorination agent is connected to the defluorination agent warehouse.

[0009] In a preferred embodiment of the present invention, a plurality of stirring blades are arranged on the rotating shaft of the stirrer from bottom to top.

[0010] In a preferred embodiment of the present invention, the acid-base regulating agent bin, the coagulant agent bin and the defluorination agent bin are located on the same horizontal plane.

[0011] In a preferred embodiment of the present invention, the acid-base regulating agent bin, the coagulant agent bin and the defluorination agent bin are arranged in a staggered manner.

[0012] In a preferred embodiment of the present invention, the reagent outlet is flush with the inner wall of the coagulation tank or slightly protrudes from the inner wall of the coagulation tank.

[0013] In a preferred embodiment of the present invention, the muddy water diffusion nozzle is located in the lower middle part of the sedimentation tank.

[0014] In a preferred embodiment of the present invention, the separation screen is detachably connected to the sedimentation tank.

[0015] In a preferred embodiment of the present invention, the sludge return ratio is 20-80%.

[0016] The beneficial effects of the utility model are as follows: by uniformly adding and stirring the reagent, the sludge and the reagent are fully reacted to remove fluoride, and the sludge is returned in proportion to carry out secondary defluoridation, thereby deeply removing fluoride ions in the sludge, making the fluoride ion concentration in the water discharged from the sedimentation tank stably lower than 1 mg / L, thereby improving the efficiency and effect of sludge defluoridation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. Among them:

[0018] Figure 1 This is a structural diagram of a preferred embodiment of a sludge deep defluorination device of the utility model;

[0019] Figure 2 It is a partial cross-sectional structural diagram of a preferred embodiment of a sludge deep defluorination device of the present utility model. DETAILED DESCRIPTION

[0020] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] See also Figure 1-2 , the embodiments of the present utility model include:

[0022] A sludge deep defluorination device is suitable for treating fluoride-containing wastewater with a fluoride ion concentration of less than 10 mg / L, especially less than 5 mg / L. The device comprises: a coagulation tank 1, a sludge feed port 2, a reagent feeding mechanism 3, an agitator 4, a mud and water conveying pipeline 5, a sedimentation tank 6, a drain port 7, a mud discharge port 8, a mud and water diffusion nozzle 9, a sludge return pipeline 10, and a separation screen 11.

[0023] A sludge feed port is provided at the bottom of the coagulation tank to input sludge into the coagulation tank. A reagent feeding mechanism is provided at the upper part of the coagulation tank to feed treatment reagents into the sludge. The agitator is rotatably provided in the coagulation tank to mix and stir the sludge and reagents.

[0024] Further preferably, sensors for detecting the liquid level of sludge or mud-water mixture are provided in the coagulation tank and the sedimentation tank.

[0025] Further preferably, a sealing cover is provided on the top of the coagulation tank.

[0026] Further preferably, a plurality of groups of stirring blades are arranged on the rotating shaft of the stirrer from bottom to top.

[0027] The reagent feeding mechanism includes an acid-base regulating reagent bin 31 , a coagulant reagent bin 32 , a defluorination reagent bin 33 , a reagent feeding pipeline 34 , a reagent outlet 35 , and a reagent outlet slope 36 .

[0028] The acid-base regulating agent bin, coagulant agent bin and defluoridation agent bin are arranged in a circular manner on the inner wall or top surface of the coagulation tank. The agent feeding pipe for conveying the acid-base regulating agent is connected to the acid-base regulating agent bin, the agent feeding pipe for conveying the flocculation and coagulant agent is connected to the coagulant agent bin, and the agent feeding pipe for conveying the defluoridation agent is connected to the defluoridation agent bin. The bottom of the inner wall of the acid-base regulating agent bin, the coagulant agent bin and the defluoridation agent bin is provided with an agent outlet, and each agent bin is provided with an agent outlet slope, which gradually slopes downward from the outside to the inside and extends to the agent outlet, and the width of the agent outlet slope gradually increases from the outside to the inside to form a trapezoidal guide surface, so that when the agent flows out from the agent outlet, it can be diffused and sprayed outward under the action of the agent outlet slope, thereby increasing the coverage area of ​​the agent, promoting the reaction with the sludge, and improving the efficiency of sludge treatment.

[0029] Further preferably, the acid-base adjustment agent bin, the coagulant agent bin and the defluorination agent bin can be on the same horizontal plane, or can be arranged at different heights.

[0030] Further preferably, the medicine feeding pipeline is connected to the top of the medicine bin, and a pump or a pressurizing device can be additionally provided thereon.

[0031] Further preferably, the reagent outlet is flush with the inner wall of the coagulation tank or slightly protrudes from the inner wall of the coagulation tank to prevent the reagent from being sprayed on the agitator or the coagulation tank wall and causing waste.

[0032] Further preferably, a control valve for opening or closing the drug feeding pipeline is connected to the control valve, which is connected to a switch controller to output the drug according to a preset dosage frequency and dosage, thereby achieving controllable drug delivery. The control valve, switch controller, and their connection relationship can adopt conventional techniques in the art, and this application does not involve improvements thereto.

[0033] Further preferably, the acid-base regulating agents include acidic agents and alkaline agents, and the pH range of the coagulation tank should be controlled in the range of 6-9, especially in the range of 6.5-7.5 for the best effect; among them, the acidic agents can use one or more of sulfuric acid, hydrochloric acid, nitric acid, and phosphoric acid according to the discharge requirements; the alkaline agents can use one or more of calcium hydroxide, potassium hydroxide, sodium hydroxide, sodium carbonate, and sodium bicarbonate according to the discharge requirements.

[0034] Further preferably, the flocculation and coagulation agent can be polyaluminum, polyiron, PAM, etc.;

[0035] Further preferably, the defluoridating agent can be a mixture containing aluminum, silicon, iron, calcium, magnesium and other substances to form a fluorine-containing precipitate with fluoride ions in the water body. The composition and ratio of the defluoridating agent belong to conventional technical means in this field.

[0036] The usage of the defluoridating agent is 0.2‰-3‰ of the sludge mass, and the optimal dosage ratio is 0.3‰-1‰, which reduces the defluoridation cost by more than 30% compared with the conventional dosing system.

[0037] One end of the mud and water conveying pipe is connected to the upper part of the coagulation tank, and the other end extends to the sedimentation tank and is connected to the mud and water diffusion nozzle to transport the mud and water (containing a mixture of defluoridating agent, fluorine-containing precipitate, and sludge) in the coagulation tank to the sedimentation tank and spray it evenly in the sedimentation tank. The upper part of the sedimentation tank is provided with a drain outlet for outputting the supernatant, and the lower part is provided with a sludge outlet for discharging the sludge after defluoridation. One end of the sludge return pipe is connected to the sedimentation tank below the mud and water diffusion nozzle, and the other end extends to the lower part of the coagulation tank to return the sludge in the sedimentation tank to the coagulation tank in a certain proportion for secondary defluoridation to improve the quality of defluoridation. A separation screen is provided in the sedimentation tank above the mud and water diffusion nozzle and below the drain outlet to separate the supernatant and sludge to prevent the sludge from being accidentally extracted when the supernatant is extracted.

[0038] Further preferably, the muddy water diffusion nozzle is located in the lower middle part of the sedimentation tank.

[0039] Further preferably, the separation screen is detachably connected to the sedimentation tank.

[0040] Further preferably, a sludge pump is provided on the sludge return pipe.

[0041] Further preferably, the sludge return ratio can be 20-80%, and the optimal return ratio is 40%.

[0042] The beneficial effects of the sludge deep defluoridation device of the utility model are as follows: by uniformly adding and stirring the reagent, the sludge and the reagent are fully reacted to remove fluoride, and the sludge is returned in proportion to carry out secondary defluoridation. By utilizing physical and chemical effects such as co-precipitation and adsorption, the fluoride ions in the sludge are deeply removed, so that the fluoride ion concentration in the water discharged from the sedimentation tank is stably lower than 1 mg / L, thereby improving the efficiency and effect of sludge defluoridation.

[0043] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A sludge deep defluorination device, characterized in that: include: Coagulation tank, sludge feed port, agent feeding mechanism, agitator, mud and water conveying pipeline, sedimentation tank, drain port, mud discharge port, mud and water diffusion nozzle, sludge return pipeline, separation screen, the bottom of the coagulation tank is provided with the sludge feed port, the agent feeding mechanism is provided at the upper part of the coagulation tank, the agitator is rotatably provided in the coagulation tank, The agent feeding mechanism includes an acid-base regulating agent bin, a coagulant agent bin, a defluoridation agent bin, an agent feeding pipe, an agent outlet, and an agent outlet slope. The acid-base regulating agent bin, the coagulant agent bin and the defluoridation agent bin are circulated in sequence on the inner wall or top surface of the coagulation tank. Several agent feeding pipes for conveying acid-base regulating agents, flocculation and coagulant agents or defluoridation agents are respectively connected to the corresponding agent bins. The agent outlet is provided on the side walls of the acid-base regulating agent bin, the coagulant agent bin and the defluoridation agent bin. The agent outlet slope is provided in each agent bin. The agent outlet slope extends obliquely to the agent outlet, and the width of the agent outlet slope gradually increases along the outflow direction of the agent, so that the agent diffuses and sprays outward under the action of the agent outlet slope. One end of the mud and water conveying pipe is connected to the upper part of the coagulation tank, and the other end extends into the sedimentation tank and is connected to the mud and water diffusion nozzle. The upper part of the sedimentation tank is provided with the drain outlet for outputting the supernatant, and the lower part is provided with the mud discharge outlet. One end of the sludge return pipe is provided in the sedimentation tank below the mud and water diffusion nozzle, and the other end extends to the lower part of the coagulation tank to return the sludge in the sedimentation tank to the coagulation tank for secondary defluorination. The separation screen is provided in the sedimentation tank above the mud and water diffusion nozzle and below the drain outlet to separate mud and water.

2. A sludge deep defluorination device according to claim 1, characterized in that: Sensors for detecting the liquid level of sludge or mud-water mixture are provided in the coagulation tank and the sedimentation tank.

3. The sludge deep defluorination device according to claim 1, characterized in that: The agent feeding pipeline for conveying acid-base regulating agent is connected to the acid-base regulating agent warehouse, the agent feeding pipeline for conveying flocculation and coagulation agent is connected to the coagulation agent warehouse, and the agent feeding pipeline for conveying defluorination agent is connected to the defluorination agent warehouse.

4. The sludge deep defluorination device according to claim 1, characterized in that: A plurality of stirring blades are arranged on the rotating shaft of the stirrer from bottom to top.

5. The sludge deep defluorination device according to claim 1, characterized in that: The acid-base adjustment agent tank, coagulant agent tank and defluoridation agent tank are located on the same horizontal plane.

6. The sludge deep defluorination device according to claim 1, characterized in that: The acid-base adjustment agent bin, coagulant agent bin and defluoridation agent bin are arranged in a staggered manner.

7. The sludge deep defluorination device according to claim 1, characterized in that: The reagent outlet is flush with the inner wall of the coagulation tank or slightly protrudes from the inner wall of the coagulation tank.

8. The sludge deep defluorination device according to claim 1, characterized in that: The muddy water diffusion nozzle is located in the middle and lower part of the sedimentation tank.

9. The sludge deep defluorination device according to claim 1, characterized in that: The separation screen is detachably connected to the sedimentation tank.

10. The sludge deep defluorination device according to claim 1, characterized in that: The sludge return ratio is 20-80%.

Images