Large-size bar production water treatment system

Abstract

The present application discloses a large-size rod production water treatment system, including: a cyclone pool, a tonic pool, a flotation pool, and a sedimentation overflow pool; the water for large-size rod production is collected and pumped tangentially into the cyclone pool; a first dosing group pipe is inserted on the side wall of the cyclone pool away from the liquid inlet; a liquid outlet pipe is arranged near the first stirring assembly at the center of the cyclone pool, and after the solid suspended impurities are separated by cyclone centrifugation, the central area of ​​the cyclone pool is connected with the tonic pool through the liquid outlet pipe. By arranging a coagulant and flocculant filling pipe on the side wall of the cyclone pool away from the liquid inlet end, and arranging a liquid outlet pipe at the central axis of the cyclone pool, the impurities in the wastewater entering the cyclone pool are subjected to centrifugal force and swirl to the inner wall to fully mix with the agent, thereby destroying the emulsified droplet structure of the waste, increasing the proportion of impurity flocculation to form solids, and improving the removal ratio of solid impurities in the cyclone stage.

Description

Technical Field

[0001] The present application relates to the technical field, and in particular to a water treatment system for large-size bar production. Background Art

[0002] During the production of rods, high-pressure water dephosphorization is often required. At this time, high-pressure water is needed to flush the rods to make all kinds of impurities contained therein float out, which is convenient for separation and improvement of rod material. At the same time, the main motor, hydraulic station, air compressor station, etc. all need to use cooling water, and the wastewater produced is mainly suspended solid impurities and oil droplets. The treated wastewater can be recycled into the iron sheet punching link for plate production.

[0003] After the existing wastewater treatment process, the resulting circulating water often contains trace suspended oil droplets and wrapped solid waste, which is difficult to remove effectively. After the wastewater enters the sedimentation tank, due to the large impact force, the floccules wrapped in solid residues rise synchronously with the bubbles under the action of the reagents. Scum is easily generated at the front end of the sedimentation tank, affecting the water quality after advection overflow.

[0004] The suspended solids content in the water currently entering the sedimentation tank is too high, resulting in excessive treatment load in the sedimentation tank, affecting the effluent quality, making the residual amount of tiny solid waste in the circulating water high, affecting the recycling phosphorus removal effect and product quality, and causing various defects on the product surface. Summary of the invention

[0005] The present application provides a water treatment system for large-size rod production, which is used to solve the technical problems that when solid impurities contained in existing wastewater enter the sedimentation tank from the cyclone tank, the impact force is too large, and the solid impurities are easily floated with bubbles under the action of the agent, resulting in scum easily generated in the sedimentation tank; the suspended matter content of the water entering the sedimentation tank is too high, which affects the quality of the obtained product when it is circulated for the phosphorus removal process.

[0006] The present application provides a large-size bar production water treatment system, comprising: a cyclone pool, a drug supplement pool, an air flotation pool, and a sedimentation overflow pool; the large-size bar production water is collected and pumped tangentially into the cyclone pool; a first drug addition group pipe is inserted on the side wall of the cyclone pool away from the liquid inlet;

[0007] A liquid outlet pipe is arranged at the center of the cyclone pool near the first stirring assembly, and after the solid suspended impurities are separated by cyclone centrifugation, the central area of ​​the cyclone pool is connected with the tonic medicine pool through the liquid outlet pipe;

[0008] A second stirring assembly is arranged in the medicine replenishing pool; a second medicine adding group pipe extends into the medicine replenishing pool and is arranged near the liquid outlet end of the liquid outlet pipe;

[0009] The lower side wall of the medicine replenishing pool is connected to the lower side wall of the air flotation pool through a pipeline, and an air supply pipe is arranged above the liquid outlet of the pipeline connecting the medicine replenishing pool and the air flotation pool;

[0010] An overflow port is provided on the upper part of the other side wall of the medicine replenishing pool and is connected to the scum pool;

[0011] A liquid outlet is provided on the lower side wall of the medicine replenishing tank and is connected to the lower side wall of the sedimentation overflow tank;

[0012] The first dosing group tubes are arranged in pairs, and flocculants and coagulants are added respectively; the second dosing group tubes include a flocculation tube, a coagulation tube and an iron powder tube, which are used to add flocculants, coagulants and ferroferric oxide powder respectively;

[0013] The flocculants and coagulants added to the cyclone tank and the tonic tank are added at a mass ratio of 1:15-21; the ferroferric oxide powder is added at 0.3-0.5 times the sum of the mass of the flocculants and coagulants added to the tonic tank, and the ferroferric oxide powder is added before the flocculants and coagulants are added;

[0014] The ferroferric oxide powder comprises: engine oil, the engine oil and the ferroferric oxide powder are mixed and stirred evenly at a mass ratio of 0.2 to 0.3:1 and then set aside;

[0015] The sedimentation overflow pool comprises: a plurality of mutually isolated magnetic attraction zones, in which water flows along an S-shaped path; a plurality of magnetic attraction grid plates are longitudinally spaced apart in each magnetic attraction zone; and the magnetic attraction grid plates are made of strong magnets.

[0016] Preferably, the cyclone pool includes: a liquid inlet pool, a sedimentation cylinder, a mud collecting cylinder, a plurality of baffles, and a mud discharge pipe; the sedimentation cylinder is arranged on the bottom surface of the liquid inlet pool and connected to the liquid inlet pool; the sedimentation cylinder and the mud collecting cylinder are communicated, and the mud collecting cylinder is arranged on the bottom surface of the sedimentation cylinder; a plurality of baffles are circumferentially arranged on the inner wall of the sedimentation cylinder and extend obliquely toward the mud collecting cylinder; one end of the mud discharge pipe is extended into the mud collecting cylinder, and the other end of the mud discharge pipe is communicated with the concentration tank.

[0017] Preferably, the liquid inlet pool comprises: a tangential water inlet pipe, one end of which is tangentially connected to the side wall of the liquid inlet pool.

[0018] Preferably, the magnetic attraction zone includes: a first magnetic attraction zone, a second magnetic attraction zone, a third magnetic attraction zone, and a fourth magnetic attraction zone; the first magnetic attraction zone, the second magnetic attraction zone, the third magnetic attraction zone, and the fourth magnetic attraction zone are arranged adjacent to each other; the first magnetic attraction zone is arranged close to the liquid inlet end; the fourth magnetic attraction zone is arranged close to the liquid outlet end;

[0019] The wastewater to be treated moves from the liquid inlet end to the liquid outlet end along an S-shaped path between the first magnetic attraction area, the second magnetic attraction area, the third magnetic attraction area, and the fourth magnetic attraction area.

[0020] Preferably, the first magnetic attraction zone is divided into a plurality of interconnected grids along the first magnetic attraction zone, and three layers of magnetic grid plates are arranged in each grid along the depth direction of the grid; the wastewater to be treated moves from one grid to the other grid along an S-shaped path between the grids in the first magnetic attraction zone;

[0021] The second magnetic attraction zone is divided into a plurality of interconnected grids along the second magnetic attraction zone, and three layers of magnetic grid plates are arranged in each grid along the depth direction of the grid; the wastewater to be treated moves from one grid to the other grid along an S-shaped path between the grids in the second magnetic attraction zone;

[0022] The third magnetic attraction zone is divided into a plurality of interconnected grids along the third magnetic attraction zone, and two layers of magnetic grid plates are arranged in each grid along the depth direction of the grid; the wastewater to be treated moves from one grid to the other grid along an S-shaped path between the grids in the second magnetic attraction zone;

[0023] The fourth magnetic attraction zone is laterally divided into a plurality of interconnected grids, and two layers of magnetic grid plates are arranged in each grid along the depth direction of the grid; the wastewater to be treated moves from one side grid to the other side grid along an S-shaped path between the grids in the fourth magnetic attraction zone.

[0024] Preferably, the magnetic grid plate comprises: a plurality of magnetic holes arranged in an array.

[0025] Preferably, the sedimentation overflow tank comprises: an inclined plate area; the inclined plate area is arranged close to the liquid outlet end of the sedimentation overflow tank and is connected to the magnetic attraction area; and a grid plate is obliquely arranged at the lower part of the inclined plate area.

[0026] Preferably, the inclined plate area is divided into a plurality of interconnected grids along the horizontal direction of the inclined plate area, and a grid plate is arranged at the bottom of each grid; the wastewater to be treated moves from one grid to the other along an S-shaped path between the grids in the inclined plate area and flows out from the liquid outlet.

[0027] Preferably, each grid plate is arranged at an angle of 20 to 30 degrees to the horizontal plane.

[0028] Preferably, after the engine oil is heated until it melts, ferroferric oxide powder is added and stirred evenly, and then the temperature is lowered until the engine oil solidifies for use.

[0029] The beneficial effects of this application include:

[0030] 1) The large-size rod production water treatment system provided by the present application sets a coagulant and flocculant filling pipe on the side wall of the cyclone pool away from the liquid inlet end, and sets a liquid outlet pipe at the central axis of the cyclone pool, so that the impurities in the wastewater entering the cyclone pool are subjected to centrifugal force to swirl to the inner wall and fully mix with the reagents, destroying the emulsified droplet structure of the waste, increasing the proportion of impurity flocculation to form solids, and improving the removal ratio of solid impurities in the cyclone stage. Through sampling, it was found that the use of this setting method can effectively reduce the content of solid impurities in the clear water after cyclone treatment. Compared with the original method of adding reagents at the center of the stirring shaft of the cyclone pool, the solid impurities contained in the clear water flowing out of the cyclone pool are only about 26.8% of the inlet water, effectively increasing the proportion of trace impurities forming solid impurities in the cyclone pool. After using this system, the suspended solids in the cyclone pool outlet are only about 110mg / L, the oil concentration is about 10mg / L, and the turbidity is only about 35NTU, reducing the treatment load of the sedimentation overflow pool. After treatment in the sedimentation overflow tank, the suspended solids content is only about 0.5 mg / L, the oil content is only about 0.6 mg / L, and the turbidity is only 3 NTU, which can effectively reduce the defect ratio of steel after recycling.

[0031] 2) The large-size bar production water treatment system provided in the present application, by respectively arranging multiple layers of magnetic orifice plates in the overflow troughs at each level in the front end of the sedimentation overflow tank, facilitates the effective magnetic attraction of flocculated impurities with a high iron oxide content entering the sedimentation overflow tank, reduces the proportion of scum generated at the front end of the sedimentation overflow tank, and prevents the scum from continuously overflowing with the water and affecting the quality of the treated water.

[0032] 3) The large-size rod production water treatment system provided in this application, the flocculant used in this application is dithiocarbamate (DTC), which can form a network structure with substances containing divalent iron ions in the water and precipitate. The structure is reliable, and the iron-containing impurities can be effectively separated from the water body under the centrifugal force of the cyclone pool without causing the precipitated solids to be broken and difficult to separate due to the collision of the precipitated substances with the side wall of the cyclone pool.

[0033] 4) The large-size bar production water treatment system provided in the present application is achieved by setting a dosing tank between the sedimentation overflow tank and the cyclone tank, and simultaneously adding DTC and coagulant into the dosing tank, and then introducing gas into the tank, so that the formed suspended matter floats up with the gas, thereby reducing the proportion of scum contained in the water entering the sedimentation overflow tank. At the same time, a liquid outlet is opened in the middle of the tank body, and the liquid mixed with the agent in the middle is introduced into the sedimentation overflow tank, thereby improving the water quality entering the sedimentation overflow tank and reducing the treatment load of the sedimentation overflow tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 Schematic diagram of the water treatment system for large-size bar production provided for this application;

[0035] Figure 2 for Figure 1 AA-direction cross-sectional structural diagram;

[0036] Figure 3 A schematic diagram of the top view structure of the magnetic grid provided in this application;

[0037] Figure 4 A schematic diagram of the three-dimensional structure of the inclined plate provided for this application;

[0038] Figure 5 A schematic diagram of the top view of the cyclone pool provided in this application;

[0039] Figure 6 A schematic diagram of a partially enlarged structure of the magnetic grid provided in this application;

[0040] Figure 7 A schematic diagram of the water flow structure of the sedimentation overflow tank provided in this application from a bird's-eye view;

[0041] Legend:

[0042] 10. Liquid inlet tank; 101. Tangential water inlet pipe; 11. Agitator; 112. Baffle; 113. First stirring assembly; 114. Sedimentation cylinder; 115. Mud collecting cylinder; 116. Liquid outlet pump; 117. First dosing group pipe; 118. Liquid outlet pipe; 12. Supplementary medicine tank; 122. Second dosing group pipe; 123. Second stirring assembly; 13. Flotation tank; 131. Gas adding pipe; 133. Scum tank; 14. Sedimentation overflow tank; 141. First magnetic attraction zone; 142. Second magnetic attraction zone; 144. Third magnetic attraction zone; 145. Fourth magnetic attraction zone; 146. Inclined plate zone; 143. Magnetic grid plate; 148. Magnetic hole; 147. Grid plate; 149. Grid slot. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0044] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] Technical features that are not used to solve the technical problems of the present application are all set or installed according to the commonly used methods in the prior art and will not be described here.

[0046] See also Figures 1 to 6 The large-size bar production water treatment system provided in the present application includes: a cyclone pool, a drug supplement pool 12, an air flotation pool 13, and a sedimentation overflow pool 14; the large-size bar production water is collected and pumped tangentially into the cyclone pool; a first drug addition group pipe 117 is inserted on the side wall of the cyclone pool away from the liquid inlet;

[0047] A liquid outlet pipe 118 is provided at the center of the cyclone pool near the first stirring assembly 113. After the cyclone centrifuge separates the solid suspended impurities, the liquid outlet pipe 118 connects the center area of ​​the cyclone pool with the tonic pool 12.

[0048] A second stirring assembly 123 is disposed in the medicine replenishing tank 12; a second medicine adding group pipe 122 extends into the medicine replenishing tank 12 and is disposed near the liquid outlet end of the liquid outlet pipe 118;

[0049] The lower side wall of the medicine replenishing pool 12 is connected to the lower side wall of the air flotation pool 13 through a pipeline, and an air supply pipe 131 is arranged above the liquid outlet of the pipeline connecting the medicine replenishing pool 12 and the air flotation pool 13;

[0050] An overflow port is provided at the upper part of the other side wall of the medicine replenishing tank 12 and is connected to the scum tank 133;

[0051] A liquid outlet is provided on the lower side wall of the medicine replenishing tank 12 and is connected to the lower side wall of the sedimentation overflow tank 14;

[0052] The first dosing group tubes 117 are arranged in pairs, and flocculants and coagulants are added respectively; the second dosing group tubes 122 include: a flocculation tube, a coagulation tube and an iron powder tube, which are used to add flocculants, coagulants and ferroferric oxide powder respectively;

[0053] The added flocculant and coagulant are added in a mass ratio of 1:15-21; the ferroferric oxide powder is added at 0.3-0.5 times the sum of the mass of the flocculant and coagulant added in the supplementary medicine tank 12, and the ferroferric oxide powder is added before the flocculant and coagulant are added;

[0054] The ferroferric oxide powder includes: engine oil, the engine oil and the ferroferric oxide powder are mixed and stirred evenly at a mass ratio of 0.2 to 0.3:1 and then set aside;

[0055] The sedimentation overflow tank 14 includes: a plurality of mutually isolated magnetic attraction zones, in which water flows along an S-shaped path; a plurality of magnetic attraction grid plates 143 are longitudinally spaced apart in each magnetic attraction zone; and the magnetic attraction grid plates 143 are made of strong magnets.

[0056] By adding ferroferric oxide powder mixed with engine oil, the wastewater containing engine oil generated in the rod production process is simulated and brought into the water when the cooling water flushes the equipment. This is beneficial for the ferroferric oxide powder particles to be evenly coated with engine oil and then enter the water body to repeatedly combine with the suspended matter in the water body. The surface similarity compatibility principle is used to achieve compatibility between the ferroferric oxide powder and the original suspended matter droplets. At the same time, the internal particles are all iron elements, which can form a coating with other iron-containing solid impurities in the flocculant, thereby improving the precipitation efficiency of flocculants and coagulants for solid impurities.

[0057] After the precipitate is formed with the subsequent addition of coagulants and flocculants, the precipitate becomes magnetic, and the magnetic grid in the subsequent sedimentation overflow tank 14 magnetically attracts the precipitate in the water body to form a precipitate, thereby improving the effective adsorption of pollutants in the sewage at the front end of the sedimentation overflow tank 14. The magnetic attraction cooperates with the natural sedimentation effect of the slow movement of the water flow in the sedimentation tank to accelerate the precipitation speed and efficiency of the precipitated pollutants in the water body. By setting a magnetic attraction plate in the sedimentation overflow tank 14, the amount of scum at the front end can be reduced, the water quality after overflow can be improved, and the proportion of solid impurities contained in the water can be reduced.

[0058] At the same time, an air flotation tank 13 and a slag tank 133 are set between the dosing tank and the sedimentation overflow tank 14, which can reduce the pollution treatment load entering the sedimentation overflow tank 14, reduce the slag ratio, improve the water quality after treatment in the sedimentation tank, and avoid defects on other steel surfaces during recycling.

[0059] The first dosing group pipe 117 is arranged far away from the water inlet end, and can utilize the suspended matter's own mass, fast acceleration and movement along the inner wall of the inlet pool 10 to perform flocculation or suspended matter droplet destruction when flowing through the drug outlet, thereby increasing the sedimentation and flocculation speed of the suspended matter, improving the efficiency of the drug, and reducing the overall use of the drug. After treatment using this modified dosing method, the total mass of flocculants and coagulants required to treat 1 cubic meter in the cyclone pool stage is only 5g.

[0060] When in use, after the wastewater to be treated enters the cyclone pool, the first stirring component 113 is started to make the water flow obtain a certain moving speed. After about 3 to 5 minutes of opening, the first dosing group pipe 117 is opened to add medicine, and the stirring is continued until obvious floccules appear and clear water is produced in the central area of ​​the first stirring component 113, and then the liquid outlet pipe 118 is opened to pump the water in the central area of ​​the cyclone pool into the medicine supplement pool 12. When the water level is above the second dosing group pipe 122, the second dosing group pipe 122 is opened to add medicine, first add ferric oxide powder, then add flocculants and coagulants, and the second stirring component 123 is opened to continue stirring. After obvious floccules appear, the water containing floccules is discharged into the flotation pool 13, and when the liquid level is above the gas adding pipe 131, compressed air is blown in to generate bubbles. The pipeline connecting the flotation pool 13 and the sedimentation overflow pool 14 is closed until the floccules float up and enter the scum pool 133 from the overflow port. The remaining clean water enters the sedimentation overflow tank 14 and moves along the S path. After overflowing, the clean water flows out of the sedimentation overflow tank 14 and is reused in the high-pressure phosphorus removal section.

[0061] By adopting the above operation, no obvious impurity defects such as black spots were detected on the surface of the plates or bars produced by the recycled dephosphorized water. The qualified rate of the products can be increased by 20% compared with the existing treatment method. The amount of flocculants and coagulants added in the cyclone tank accounts for 50% of the total amount added, and the amount of flocculants and coagulants added in the 12 supplementary medicine tanks accounts for 50% of the total amount added. Other commonly used reagents that are not described in detail are added in the way of the existing technology, which will not be repeated here. For example, lime milk. Preferably, the cyclone pool includes: a liquid inlet pool 10, a sedimentation cylinder 114, a mud collecting cylinder 115, a plurality of baffles 112, and a mud discharge pipe; the sedimentation cylinder 114 is arranged on the bottom surface of the liquid inlet pool 10 and is connected to the liquid inlet pool 10; the sedimentation cylinder 114 and the mud collecting cylinder 115 are connected, and the mud collecting cylinder 115 is arranged on the bottom surface of the sedimentation cylinder 114; the plurality of baffles 112 are circumferentially arranged on the inner wall of the sedimentation cylinder 114 and extend obliquely toward the mud collecting cylinder 115; one end of the mud discharge pipe is extended into the mud collecting cylinder 115, and the other end of the mud discharge pipe is connected to the concentration tank.

[0062] In a specific embodiment, a stirring paddle 11 is disposed at the lower portion of the first stirring assembly 113 , and the stirring paddle 11 is suspended on the interface between the liquid inlet pool 10 and the sedimentation cylinder 114 . This arrangement can achieve comprehensive and uniform stirring of the liquid.

[0063] In a specific embodiment, it includes: a liquid outlet pump 116 , which is disposed on a liquid outlet pipe 118 .

[0064] In a specific embodiment, a gate valve is provided on the communication port between the medicine replenishing tank 12 and the air flotation tank 13 to facilitate opening and closing.

[0065] By arranging a plurality of baffles 112 in the settling cylinder 114, a diversion effect can be provided for the solid impurities that flow close to the liquid inlet pool 10 under the action of centrifugal force and sink under the action of gravity, and the solid impurities can be diverted into the mud collecting cylinder 115. The baffles 112 can also prevent the eddy currents generated by the first stirring assembly 113 from stirring the solid impurities that fall between the baffles 112 again, thereby effectively improving the settling speed of the solid impurities and the solid-liquid separation efficiency.

[0066] Preferably, the liquid inlet pool 10 comprises: a tangential water inlet pipe 101, one end of which is tangentially connected to the side wall of the liquid inlet pool 10. According to this arrangement, the water flow can fully utilize the pumping flow rate, and the high acceleration of impurities under the high flow rate can be maintained, so that solid impurities can obtain a high flow rate along the side wall of the liquid inlet pool 10, and achieve preliminary solid-liquid separation at the water inlet end.

[0067] See also Figure 7 Preferably, the magnetic attraction area includes: a first magnetic attraction area 141, a second magnetic attraction area 142, a third magnetic attraction area 144, and a fourth magnetic attraction area 145; the first magnetic attraction area 141, the second magnetic attraction area 142, the third magnetic attraction area 144, and the fourth magnetic attraction area 145 are arranged adjacent to each other; the first magnetic attraction area 141 is arranged close to the liquid inlet end; the fourth magnetic attraction area 145 is arranged close to the liquid outlet end;

[0068] The wastewater to be treated moves along an S-shaped path from the liquid inlet end to the liquid outlet end between the first magnetic attraction area 141 , the second magnetic attraction area 142 , the third magnetic attraction area 144 , and the fourth magnetic attraction area 145 .

[0069] Preferably, the first magnetic attraction area 141 is transversely divided into a plurality of interconnected grids along the first magnetic attraction area 141, and three layers of magnetic grid plates 143 are arranged in each grid along the grid depth direction; the wastewater to be treated moves from one side grid to the other side grid along an S-shaped path between the grids of the first magnetic attraction area 141;

[0070] The second magnetic attraction area 142 is transversely divided into a plurality of interconnected grids along the second magnetic attraction area 142, and three layers of magnetic grid plates 143 are arranged in each grid along the grid depth direction; the wastewater to be treated moves from one grid to the other grid along an S-shaped path between the grids of the second magnetic attraction area 142;

[0071] The third magnetic attraction area 144 is transversely divided into a plurality of interconnected grids along the third magnetic attraction area 144, and two layers of magnetic grid plates 143 are arranged in each grid along the depth direction of the grid; the wastewater to be treated moves from one grid to the other grid along an S-shaped path between the grids of the second magnetic attraction area 142;

[0072] The fourth magnetic attraction zone 145 is laterally divided into a plurality of interconnected grids, and two layers of magnetic grid plates 143 are arranged in each grid along the depth direction of the grid; the wastewater to be treated moves from one grid to the other along an S-shaped path between the grids in the fourth magnetic attraction zone 145.

[0073] This treatment can extend the distance that the wastewater moves in the sedimentation overflow tank 14, which is beneficial to the repeated sedimentation and magnetic absorption of impurities contained in the sewage. Figure 7 As shown in the figure, the dotted arrows indicate that water flows from the lower connecting openings of adjacent grids; the solid arrows indicate that water flows from the upper connecting openings of adjacent grids. Thus, a three-dimensional and comprehensive S-shaped path is obtained, which improves the water quality of the effluent after sedimentation.

[0074] See also Figure 3 and 6 Preferably, the magnetic grid plate 143 includes: a plurality of magnetic holes 148 arranged in an array. When water containing suspended matter and solid impurity particles flows through the grid plate, the solid impurities or suspended matter, due to the iron oxide particles wrapped therein, have magnetic force and can be attracted and adsorbed to the side wall of the grid plate hole made of strong magnetic material, while reducing the flow rate to achieve sedimentation. By setting up multi-zone magnetic attraction, the water treatment capacity can be guaranteed.

[0075] Preferably, the sedimentation overflow tank 14 includes: an inclined plate area 146; the inclined plate area 146 is arranged near the liquid outlet end of the sedimentation overflow tank 14 and is connected to the magnetic attraction area; a grid plate 147 is obliquely arranged at the lower part of the inclined plate area 146.

[0076] By providing the grid plate 147, solid impurities such as flocculants contained in the water can be blocked and settled before the liquid is discharged, thereby reducing the amount of impurities contained in the discharged water.

[0077] Preferably, the inclined plate area 146 is divided into a plurality of interconnected grids along the inclined plate area 146, and a grid plate 147 is provided at the bottom of each grid; the wastewater to be treated moves from one grid to the other grid along an S-shaped path between the grids of the inclined plate area 146 and flows out from the liquid outlet. After passing through the sedimentation overflow tank 14, the clear liquid enters the liquid storage tank for standby use.

[0078] Preferably, each grid plate 147 is arranged at 20-30 degrees with the horizontal plane. According to this arrangement, the movement speed of solid impurities in the water body with less impurities can be fully hindered, thereby achieving a better sedimentation effect and improving the quality of the effluent water.

[0079] In a specific embodiment, the grid plate 147 includes: a frame and a plurality of rods; a plurality of rods are arranged inside the frame to divide the frame into a plurality of grid slots 149 .

[0080] Preferably, the flocculant is dithiocarbamate. The coagulant used can be various commonly used coagulants, such as polyiron, polyaluminum, polyaluminum-iron, etc.

[0081] Preferably, the engine oil is heated until it melts, and then the ferroferric oxide powder is added and stirred evenly, and then cooled until the engine oil solidifies for later use. This operation can improve the dissolution uniformity of the powder and the engine oil, and improve the uniformity of the engine oil wrapping the particles.

[0082] Example

[0083] The wastewater generated by bar production is treated by the above system.

[0084] After adopting this system, the suspended solids in the effluent of the cyclone pool are only 40-150 mg / L, and the oil concentration is about 2-6 mg / L, which reduces the processing load of the sedimentation overflow pool 14.

[0085] Example

[0086] Unless otherwise specified, the materials and instruments used in the following examples were obtained from commercial channels.

[0087] Example 1

[0088] The cooling water used by various equipment in rod production and the high-pressure water used for high-pressure phosphorus removal are pumped into the cyclone pool, the first stirring component 113 is turned on at a speed of 40 rpm, and after stirring for 2 minutes, the first dosing group pipe 117 is opened to introduce flocculants and coagulants at a mass ratio of 1:21;

[0089] After cyclone separation, various suspended solids contained therein are separated from water, mainly iron oxide scale or residue.

[0090] The cyclone pool includes: a liquid inlet pool 10, a settling cylinder 114, a mud collecting cylinder 115, a plurality of baffles 112, and a mud discharge pipe; the settling cylinder 114 is arranged on the bottom surface of the liquid inlet pool 10 and is connected to the liquid inlet pool 10; the settling cylinder 114 and the mud collecting cylinder 115 are connected, and the mud collecting cylinder 115 is arranged on the bottom surface of the settling cylinder 114; a plurality of baffles 112 are arranged on the inner wall of the settling cylinder 114 along the circumferential direction, and extend obliquely to the mud collecting cylinder 115; one end of the mud discharge pipe is extended into the mud collecting cylinder 115, and the other end of the mud discharge pipe is connected to the concentration pool. The liquid inlet pool 10 includes: a tangential water inlet pipe 101, one end of which is tangentially connected to the side wall of the liquid inlet pool 10. A liquid outlet pipe 118 is arranged near the first stirring assembly 113 at the center of the cyclone pool. After the cyclone centrifuges to separate the solid suspended impurities, the liquid outlet pipe 118 connects the center area of ​​the cyclone pool with the supplementary medicine pool 12. The first dosing group pipes 117 are arranged in pairs to add flocculants and coagulants respectively.

[0091] A second stirring assembly 123 is provided in the medicine-replenishing tank 12; the second medicine-replenishing group pipe 122 extends into the medicine-replenishing tank 12 and is provided near the liquid outlet end of the liquid outlet pipe 118; the lower side wall of the medicine-replenishing tank 12 is connected to the lower side wall of the flotation tank 13 through a pipeline, and an air-adding pipe 131 is provided above the liquid outlet of the pipeline connecting the medicine-replenishing tank 12 and the flotation tank 13; an overflow port is provided at the upper part of the other side wall of the medicine-replenishing tank 12, and is connected to the scum tank 133; a liquid outlet is provided at the lower side wall of the medicine-replenishing tank 12, and is connected to the lower side wall of the sedimentation overflow tank 14. The first medicine-replenishing group pipes 117 are provided in pairs, and flocculants and coagulants are added respectively; the second medicine-replenishing group pipes 122 include a flocculation tube, a coagulation tube and an iron powder tube, which are used to add flocculants, coagulants and ferroferric oxide powder respectively; the flocculants and coagulants are introduced at a mass ratio of 1:21;

[0092] The ferroferric oxide powder is added at 0.3 times the sum of the mass of the flocculant and coagulant added in the supplementary medicine tank 12, and the ferroferric oxide powder is added within 5 minutes before the flocculant and coagulant are added, and the second stirring component 123 is turned on to stir until uniform before the flocculant and coagulant are introduced;

[0093] The flocculant used is dithiocarbamate; the coagulant is polyferric; the total amount of flocculant added is 1 mg / l; the total amount of coagulant added is 20 mg / l; the amount of flocculant and coagulant added in the cyclone tank accounts for 50% of the total amount added, and the amount of flocculant and coagulant added in 12 places in the tonic tank accounts for 50% of the total amount added.

[0094] The ferroferric oxide powder used is mixed with the engine oil heated to a completely liquid state in a mass ratio of 1:0.2, stirred evenly, and then cooled for use.

[0095] The sedimentation overflow tank 14 includes: a plurality of magnetic attraction zones isolated from each other, in which water flows along an S-shaped path; a plurality of magnetic attraction grid plates 143 are longitudinally spaced in each magnetic attraction zone; the magnetic attraction grid plates 143 are made of strong magnets. The magnetic attraction zones include: a first magnetic attraction zone 141, a second magnetic attraction zone 142, a third magnetic attraction zone 144, and a fourth magnetic attraction zone 145; the first magnetic attraction zone 141, the second magnetic attraction zone 142, the third magnetic attraction zone 144, and the fourth magnetic attraction zone 145 are arranged adjacent to each other; the first magnetic attraction zone 141 is arranged close to the liquid inlet end; the fourth magnetic attraction zone 145 is arranged close to the liquid outlet end;

[0096] The wastewater to be treated moves along an S-shaped path from the liquid inlet end to the liquid outlet end between the first magnetic attraction area 141 , the second magnetic attraction area 142 , the third magnetic attraction area 144 , and the fourth magnetic attraction area 145 .

[0097] The first magnetic attraction area 141 is transversely divided into a plurality of interconnected grids along the first magnetic attraction area 141, and three layers of magnetic grid plates 143 are arranged in each grid along the grid depth direction; the wastewater to be treated moves from one grid to the other grid along an S-shaped path between the grids of the first magnetic attraction area 141;

[0098] The second magnetic attraction area 142 is transversely divided into a plurality of interconnected grids along the second magnetic attraction area 142, and three layers of magnetic grid plates 143 are arranged in each grid along the grid depth direction; the wastewater to be treated moves from one grid to the other grid along an S-shaped path between the grids of the second magnetic attraction area 142;

[0099] The third magnetic attraction area 144 is transversely divided into a plurality of interconnected grids along the third magnetic attraction area 144, and two layers of magnetic grid plates 143 are arranged in each grid along the grid depth direction; the wastewater to be treated moves from one grid to the other grid along an S-shaped path between the grids of the second magnetic attraction area 142;

[0100] The fourth magnetic attraction zone 145 is laterally divided into a plurality of interconnected grids along the fourth magnetic attraction zone 145 , and two layers of magnetic grid plates 143 are arranged in each grid along the depth direction of the grid; the wastewater to be treated moves from one side grid to the other side grid along an S-shaped path between the grids of the fourth magnetic attraction zone 145 .

[0101] The magnetic grid plate 143 includes a plurality of magnetic holes 148 arranged in an array.

[0102] The sedimentation overflow tank 14 includes: an inclined plate area 146; the inclined plate area 146 is arranged near the liquid outlet end of the sedimentation overflow tank 14 and is connected to the magnetic attraction area; a grid plate 147 is arranged obliquely at the lower part of the inclined plate area 146. The inclined plate area 146 is divided into a plurality of interconnected grids along the inclined plate area 146, and a grid plate 147 is arranged at the lower part of each grid; the wastewater to be treated moves from one grid to the other grid along an S-shaped path between the grids of the inclined plate area 146 and flows out from the liquid outlet. Each grid plate 147 is arranged at 20 degrees to the horizontal plane.

[0103] After the treatment in the cyclone pool is completed, the liquid outlet pipe 118 is opened to pump the water in the central area of ​​the cyclone pool into the tonic medicine pool 12. When the water level in the tonic medicine pool 12 is above the second dosing group pipe 122, the second dosing group pipe 122 is opened to add medicine, first add ferric oxide powder, then add flocculants and coagulants, and open the second stirring component 123 for continuous stirring. After obvious floccules appear, the water containing floccules is discharged into the flotation pool 13, and after the liquid level is above the gas adding pipe 131, compressed air is blown in to generate bubbles. Close the pipeline connecting the flotation pool 13 and the sedimentation overflow pool 14 until the suspended matter floats up and enters the scum pool 133 from the overflow port. The remaining clean water enters the sedimentation overflow pool 14 and moves along the S path. After overflowing, the clean water flows out of the sedimentation overflow pool 14 and is reused in the high-pressure phosphorus removal section.

[0104] Example 2

[0105] The difference from Example 1 is that: the cyclone tank is fed with flocculants and coagulants at a mass ratio of 1:15; the tonic tank 12 is fed with flocculants and coagulants at a mass ratio of 1:15, and the ferroferric oxide powder is added at 0.5 times the sum of the mass of the flocculants and coagulants added in the tonic tank 12. The ferroferric oxide powder is mixed and stirred evenly with the engine oil heated to a completely liquid state at a mass ratio of 1:0.3, and then cooled for standby use. Each grid plate 147 is set at 30° with the horizontal plane.

[0106] Example 3

[0107] The difference from Example 1 is that: the cyclone tank is fed with flocculants and coagulants at a mass ratio of 1:17; the tonic tank 12 is fed with flocculants and coagulants at a mass ratio of 1:18, and the ferroferric oxide powder is added at 0.4 times the sum of the mass of the flocculants and coagulants added in the tonic tank 12. The ferroferric oxide powder is mixed and stirred evenly with the engine oil heated to a completely liquid state at a mass ratio of 1:0.25, and then cooled for standby use. Each grid plate 147 is set at 25° with the horizontal plane.

[0108] The water quality test results after each stage of treatment in Example 3 are shown in Table 1.

[0109] Table 1

[0110] project Water Intake Cyclone pool water Flotation tank outlet Sedimentation overflow tank outflow Suspended matter mg / L 410 110 60 0.5 Oil content mg / L 15 10 1 0.6 Turbidity (NTU) 55 35 7 3

[0111] As can be seen from Table 1, the use of the system provided by the present application can effectively reduce the suspended impurities, oil content, and turbidity in the wastewater generated by rod production, and the improvement can effectively obtain circulating water that meets the requirements of the suspended matter content of circulating water. Solid impurities in the water can be effectively separated in the cyclone tank, and in the subsequent tonic tank 12, the remaining fine particles in the water body react with flocculants and coagulants to form magnetic suspended matter. After the suspended matter is adsorbed by the magnetic grid 143 in the sedimentation overflow tank 14, solid-liquid separation is achieved, and when the water flows through the grid holes, it is divided into multiple small grids. The magnetic surface of the grid is close to each particle in the water quality, which can achieve effective adsorption and separation of particles of various sizes in the water body, and effectively improve the water quality in this step. After reducing the suspended matter content, the water is recycled to avoid the formation of various defects on the surface of the steel.

[0112] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A water treatment system for large-size bar production, characterized in that: include: A cyclone pool, a medicine replenishing pool (12), an air flotation pool (13), and a sedimentation overflow pool (14); water for large-size bar production is collected and pumped tangentially into the cyclone pool; a first medicine dosing group pipe (117) is inserted on the side wall of the cyclone pool away from the liquid inlet; A liquid outlet pipe (118) is arranged at the center of the cyclone pool near the first stirring assembly (113); after the solid suspended impurities are separated by cyclone centrifugation, the central area of ​​the cyclone pool is connected to the tonic medicine pool (12) through the liquid outlet pipe (118); A second stirring assembly (123) is arranged in the medicine replenishing pool (12); a second medicine adding group pipe (122) extends into the medicine replenishing pool (12) and is arranged close to the liquid outlet end of the liquid outlet pipe (118); The lower side wall of the medicine replenishing pool (12) is connected to the lower side wall of the air flotation pool (13) through a pipeline, and an air supply pipe (131) is arranged above the liquid outlet of the pipeline connecting the medicine replenishing pool (12) and the air flotation pool (13); An overflow port is provided at the upper portion of the other side wall of the medicine replenishing pool (12) and is connected to the scum pool (133); The lower side wall of the medicine replenishing tank (12) is provided with a liquid outlet and is connected to the lower side wall of the sedimentation overflow tank (14); The first dosing group tubes (117) are arranged in pairs, and flocculants and coagulants are added respectively; the second dosing group tubes (122) include a flocculation tube, a coagulant tube and an iron powder tube, and are used to add flocculants, coagulants, and ferroferric oxide powder mixed into the engine oil respectively; The flocculants and coagulants added to the cyclone tank and the tonic tank (12) are added at a mass ratio of 1:15-21; the ferroferric oxide powder mixed into the engine oil is added at a mass ratio of 0.3-0.5 times the sum of the mass of the flocculants and coagulants added into the tonic tank (12), and the ferroferric oxide powder mixed into the engine oil is added before the flocculants and coagulants are added; The ferroferric oxide powder mixed into the engine oil comprises: engine oil, the engine oil and the ferroferric oxide powder are mixed and stirred evenly at a mass ratio of 0.2 to 0.3:1 and then set aside; The sedimentation overflow pool (14) comprises: a plurality of mutually isolated magnetic attraction zones, in which water flows along an S-shaped path; a plurality of magnetic attraction grid plates (143) are longitudinally arranged at intervals in each magnetic attraction zone; the magnetic attraction grid plates (143) are made of strong magnets; the cyclone pool comprises: a liquid inlet pool (10), a sedimentation cylinder (114), a mud collecting cylinder (115), a plurality of baffle plates (112), and a mud discharge pipe; the sedimentation cylinder (114) is arranged on the bottom surface of the liquid inlet pool (10) and is connected to the liquid inlet pool (10); the sedimentation cylinder (115) is connected to the bottom surface of the liquid inlet pool (10); the 4) is connected with a mud collecting cylinder (115), and the mud collecting cylinder (115) is arranged on the bottom surface of the sedimentation cylinder (114); a plurality of baffles (112) are arranged on the inner side wall of the sedimentation cylinder (114) along the circumferential direction, and extend obliquely toward the mud collecting cylinder (115); one end of the mud discharge pipe is extended into the mud collecting cylinder (115), and the other end of the mud discharge pipe is connected with the concentration tank; the liquid inlet tank (10) comprises: a tangential water inlet pipe (101), one end of which is tangentially connected with the side wall of the liquid inlet tank (10); The sedimentation overflow tank (14) comprises: an inclined plate area (146); the inclined plate area (146) is arranged near the liquid outlet end of the sedimentation overflow tank (14) and is connected to the magnetic attraction area; a grid plate (147) is obliquely arranged at the lower part of the inclined plate area (146); The inclined plate area (146) is divided into a plurality of grids that are interconnected along the inclined plate area (146) in the horizontal direction, and a grid plate (147) is arranged at the bottom of each grid; the wastewater to be treated moves along an S-shaped path from one grid to the other grid in the inclined plate area (146) and flows out from the liquid outlet.

2. The large-size bar production water treatment system according to claim 1 is characterized in that: The magnetic attraction zone comprises: a first magnetic attraction zone (141), a second magnetic attraction zone (142), a third magnetic attraction zone (144), and a fourth magnetic attraction zone (145); the first magnetic attraction zone (141), the second magnetic attraction zone (142), the third magnetic attraction zone (144), and the fourth magnetic attraction zone (145) are arranged adjacent to each other; the first magnetic attraction zone (141) is arranged close to the liquid inlet end; and the fourth magnetic attraction zone (145) is arranged close to the liquid outlet end; The wastewater to be treated moves along an S-shaped path from the liquid inlet end to the liquid outlet end between the first magnetic attraction area (141), the second magnetic attraction area (142), the third magnetic attraction area (144), and the fourth magnetic attraction area (145).

3. The large-size bar production water treatment system according to claim 2 is characterized in that: The first magnetic attraction area (141) is transversely divided into a plurality of interconnected grids along the first magnetic attraction area (141), and three layers of magnetic grid plates (143) are arranged in each grid at intervals along the grid depth direction; the wastewater to be treated moves from one grid to the other grid along an S-shaped path between the grids in the first magnetic attraction area (141); The second magnetic attraction area (142) is transversely divided into a plurality of interconnected grids along the second magnetic attraction area (142), and three layers of magnetic grid plates (143) are arranged in each grid at intervals along the grid depth direction; the wastewater to be treated moves from one grid to the other grid along an S-shaped path between the grids in the second magnetic attraction area (142); The third magnetic attraction area (144) is transversely divided into a plurality of interconnected grids along the third magnetic attraction area (144), and two layers of magnetic grid plates (143) are arranged in each grid at intervals along the grid depth direction; the wastewater to be treated moves from one grid to the other grid along an S-shaped path between the grids in the second magnetic attraction area (142); The fourth magnetic attraction zone (145) is laterally divided into a plurality of interconnected grids along the fourth magnetic attraction zone (145), and two layers of magnetic grid plates (143) are arranged in each grid at intervals along the grid depth direction; the wastewater to be treated moves from one grid to the other grid along an S-shaped path between the grids in the fourth magnetic attraction zone (145).

4. The large-size bar production water treatment system according to claim 1 is characterized in that: The magnetic attraction grid plate (143) comprises: a plurality of magnetic attraction holes (148) arranged in an array.

5. The large-size bar production water treatment system according to claim 1 is characterized in that: Each grid plate (147) is arranged at an angle of 20 to 30 degrees to the horizontal plane.

6. The large-size bar production water treatment system according to claim 1 is characterized in that: After the engine oil is heated until it melts, ferroferric oxide powder is added thereto and stirred evenly, and then the temperature is lowered until the engine oil solidifies for later use.

Images