Construction waste light substance recycling production line and production method

Abstract

The invention discloses a construction waste light substance recycling production line and a production method. The production line comprises a bouncing screen, the downstream side of the bouncing screen is connected with two or more stages of shredding machines through a first belt conveyor, a sorting room is arranged between the bouncing screen and the first-stage shredding machine, and the first belt conveyor penetrates through the sorting room; all levels of shredding machines are connected through belt conveyors, and a dry cleaning and winnowing system is arranged at the downstream of the last level of shredding machine; the dry cleaning and winnowing system comprises a dry cleaning machine, a discharging belt conveyor and a fan which are matched in sequence, a material receiving belt conveyor is arranged on one side of the discharging end of the discharging belt conveyor, and a separator of a water washing line is arranged on the downstream side of the material receiving belt conveyor; the washing line comprises a water circulation system, a separator, a washing pool and a drum screen, wherein the separator, the washing pool and the drum screen are sequentially connected and are connected with the water circulation system in a matched mode. The invention further discloses a production method. The problem that a pure plastic film is difficult to obtain in the prior art can be solved.

Description

Technical Field

[0001] The invention relates to a production line and a production method for recycling light materials from construction waste, and belongs to the technical field of construction waste recycling. Background Art

[0002] Construction waste refers to waste generated by construction companies or individuals during the construction, installation, demolition, and repair of various buildings, structures, and pipelines. Construction waste is divided into light and heavy materials. Light materials are relatively simple in composition, primarily plastic film. Heavy materials include large chunks of concrete, metal, stone, stone dust, and sand. Separating the components of construction waste is necessary to recycle plastic film into building pipes, refine oil, and use it as RDF fuel.

[0003] However, in the field of construction waste recycling, conventional recycling techniques currently struggle to produce pure plastic film. Specifically, the purity and recycling efficiency of plastic film are poor. The plastic film obtained after separating construction waste often contains various unseparated attached pollutants such as silt and dust, which impacts economic benefits. Summary of the Invention

[0004] The present invention aims to provide a production line and a production method for recycling light materials from construction waste, so as to solve the problem that it is difficult to obtain pure plastic films in the prior art.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A production line for recycling and reusing light materials from construction waste comprises a bouncing screen, wherein the downstream side of the bouncing screen is connected to two or more stages of shredders via a first belt conveyor, a sorting room is provided between the bouncing screen and the first stage of shredders, and the first belt conveyor runs through the sorting room; the shredders at each stage are connected via belt conveyors, and the last stage of shredders is connected to a dry cleaning and air separation system via a belt conveyor;

[0007] The dry cleaning and air separation system includes a dry cleaning machine, a discharging belt conveyor and a fan. The feed port of the dry cleaning machine is connected to the last-stage shredder through a belt conveyor. The feed end of the discharging belt conveyor is arranged at the discharge port of the dry cleaning machine. The fan is arranged on one side of the discharging end of the discharging belt conveyor. A receiving belt conveyor for receiving the material blown out by the fan is arranged on one side of the discharging end of the discharging belt conveyor. A water washing line is arranged on the downstream side of the receiving belt conveyor.

[0008] The water washing line includes a water circulation system and a separator, a washing tank and a drum screen connected in sequence, and the separator receives the material from the receiving belt conveyor;

[0009] The water circulation system includes a collection tank, an inclined mesh filter, a sedimentation tank, a sedimentation tank, and a filter press connected end to end. The sedimentation tank is connected to the medicine tank and the clear water tank respectively; the separator, the flushing tank, and the drum screen are connected to the collection tank respectively through sewage pipes, and the clear water tank is connected to the separator and the flushing tank respectively through clear water pipes.

[0010] Furthermore, the inclined screen filter includes a fixed frame, an overflow trough provided on the fixed frame, a filter screen inclined on the fixed frame, and a water collection tank directly below the filter screen; the overflow trough is connected to the collection tank, the filter screen is provided on one side of the overflow trough, and the water collection tank is connected to the sedimentation tank.

[0011] Furthermore, the flushing tank includes a tank body, a slope provided at the end of the tank body, a chain scraper provided in the tank body, and three or more flushing water pipes provided above the tank body; the tank body is connected to the collection tank through a sewage pipe, one end of the chain scraper is provided on the slope, and the three or more flushing water pipes are arranged at intervals along the length direction of the tank body. The flushing water pipes are connected to the clean water tank through a clean water pipe, and the material separated from the separator is received above one end of the tank body with a slope.

[0012] Furthermore, the sedimentation tank is provided with a collection box connected to the sedimentation tank and the medicine tank respectively, a sinking channel connected to the collection box and extending to the bottom of the sedimentation tank, and an overflow trough connected to the bottom of the sedimentation tank and the clear water tank respectively.

[0013] Furthermore, the dry cleaning machine includes a mounting frame, a dry cleaning cylinder and a driving device arranged on the mounting frame, a feed port and a discharge port arranged at both ends of the dry cleaning cylinder, a spiral shaft arranged inside the dry cleaning cylinder and connected to the driving device, a drop port arranged at the bottom of the dry cleaning cylinder, and a dry cleaning screen arranged at the drop port and with a gap between it and the spiral shaft.

[0014] Furthermore, the sorting room includes a housing body, a plurality of sorting stations and / or sorting equipment arranged in the housing body, and a silo arranged outside the housing body and connected to the bottom of the housing body through a channel;

[0015] Several sorting stations and / or sorting equipment are arranged on the same side of the first belt conveyor, and the silo is arranged on the other side of the first belt conveyor.

[0016] Based on the same inventive concept, the present invention also provides a production method for recycling and reusing light materials from construction waste using the above production line, which comprises the following steps:

[0017] S1: Send the construction waste to the bouncing screen for pre-sorting to select large pieces of concrete, metal, stone powder, sand and materials containing plastic film;

[0018] S2: The material containing plastic film is sent to the sorting room through the first belt conveyor for further sorting to select stones and metals;

[0019] S3: The further sorted plastic film-containing material is sent to a two-stage or more shredder through a first belt conveyor for multi-stage shredding;

[0020] S4: The multi-stage shredded plastic film-containing material is sent to the dry cleaning and air separation system for further dry cleaning, beating and air separation to remove attached contaminants and obtain wood chips and rubber as well as purer plastic film-containing materials;

[0021] S5: The material containing the plastic film is sent into the separator for impurity separation, and the wastewater generated by the separation is sent to the water circulation system for recycling treatment. The clean water required for separation is circulated by the water circulation system;

[0022] S6: After the impurities are separated, the material containing the plastic film is sent to the washing tank for washing. The wastewater generated by the washing is sent to the water circulation system for recycling treatment. The clean water required for washing is circulated by the water circulation system;

[0023] S7: The washed material containing the plastic film is sent to a drum screen for dehydration and screening, and finally a pure plastic film is obtained. The removed wastewater is sent to a water circulation system for recycling treatment.

[0024] Furthermore, the sewage is fed into the water circulation system for circulation treatment and the clean water is circulated by the water circulation system and provided in a circulation manner, including the following steps:

[0025] S100: Send the sewage into the collection tank for collection;

[0026] S200: The collected sewage is sent to the inclined mesh filter for filtration, and the plastic film obtained by filtration is automatically collected on the filter screen of the inclined mesh filter. At the same time, the filtered sewage falls into the water collection tank of the inclined mesh filter and is automatically collected;

[0027] S300: The sewage in the collection tank is sent to the sedimentation tank for natural sedimentation and storage;

[0028] S400: The sewage in the sedimentation tank and the chemicals in the medicine tank are sent to the sedimentation tank for chemical precipitation;

[0029] S500: The clean water overflowing from the sedimentation tank is sent to the clean water tank, which is then circulated to provide clean water. At the same time, the sediment deposited at the bottom of the sedimentation tank is sent to the filter press for filtration to obtain a mud cake.

[0030] S600: The wastewater produced by the filter press is sent to a collection tank.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. The light material recycling and reuse production line of construction waste of the present invention solves the problem that it is difficult to obtain pure plastic film in the prior art through "pre-sorting by bouncing screen + sorting in sorting room + multi-stage shredding by two or more stage shredders + dry cleaning, beating and air separation by dry cleaning and air separation system + water washing and water circulation by water washing line", thereby improving the recycling purity and recycling rate of plastic film and improving production efficiency.

[0033] 2. The construction waste light material recycling and reuse production line of the present invention realizes clean water circulation and sewage circulation through the setting of the water circulation system. The circulating water replenishment amount is ≤10% of the total water consumption, achieving a water saving rate of ≥90%, thereby improving the clean water reuse rate and sewage resource utilization rate.

[0034] 3. The construction waste light material recycling and reutilization production line of the present invention realizes further automatic collection of plastic films in sewage by setting up an inclined mesh filter, thereby improving the recycling rate of plastic films, and improving operational convenience and production efficiency.

[0035] 4. The construction waste light material recycling and reuse production line of the present invention further improves the recycling purity of plastic films by setting up an integrated flushing tank, and realizes the automatic collection of attached pollutants through the slope and chain scraper.

[0036] 5. The construction waste light material recycling and reuse production line of the present invention is conducive to stripping off attached pollutants through the installation of a dry cleaning machine, further improving the recycling purity of plastic films and improving production efficiency.

[0037] 6. The light material recycling and reuse production line of construction waste of the present invention reduces the distance that workers or equipment need to move and improves the efficiency and convenience of sorting by adopting a single-sided sorting station and / or sorting equipment layout and a facing silo in the sorting room. At the same time, combined with the closed environment of the sorting room, the sorting efficiency is improved by about 20% to 30%.

[0038] 7. The production method of the present invention solves the problem that it is difficult to obtain pure plastic film in the existing technology through "pre-sorting + sorting in the sorting room + shredding at two levels or more + dry cleaning and air separation + water washing and water circulation", improves the recycling purity and recycling rate of the plastic film, and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a process flow chart of an embodiment of the present invention;

[0040] Figure 2 This is a schematic diagram of the plan layout of an embodiment of the construction waste recycling and reutilization production line of the present invention;

[0041] Figure 3 It is a schematic diagram of the three-dimensional structure of the dry cleaning air separation system of the present invention;

[0042] Figure 4 It is a schematic diagram of the three-dimensional structure of the dry cleaning machine of the present invention;

[0043] Figure 5 1 is a bottom view schematic diagram of the dry cleaning machine of the present invention;

[0044] Figure 6 1 is a schematic diagram of the top view of the flushing pool of the present invention;

[0045] Figure 7 This is a schematic diagram of the three-dimensional structure of the flushing pool of the present invention when no flushing water pipe is provided;

[0046] Figure 8 This is a schematic diagram of the main structure of the flushing pool of the present invention when no flushing water pipe is provided;

[0047] Figure 9 It is a schematic diagram of a partial three-dimensional structure of the water circulation system of the present invention;

[0048] Figure 10 It is a schematic diagram of the three-dimensional structure of the sedimentation tank of the present invention;

[0049] Figure 11 This is a schematic diagram of the main structure of the sorting room of the present invention;

[0050] Figure 12 It is a schematic cross-sectional structural diagram of the sorting room of the present invention.

[0051] In the figure: 1. Bouncing screen; 2. Sorting room; 3. First stage shredder; 4. Second stage shredder; 5. Dry cleaning air separation system; 6. Dry cleaning machine; 61. Mounting frame; 62. Dry cleaning cylinder; 63. Driving device; 64. Feeding port; 65. Discharging port; 66. Dropping port; 67. Dropping belt conveyor; 7. Discharging belt conveyor; 8. Fan; 9. First baler; 10. Receiving belt conveyor; 11. First belt conveyor; 12. Water-washed raw material yard; 13. Vibrating feeder; 14. Separator; 15. Flushing tank; 151. Pool itself body; 152. slope; 153. chain scraper; 154. flushing water pipe; 155. drain valve; 16. drum screen; 17. second baler; 18. collecting tank; 19. inclined mesh filter; 191. fixed frame; 192. overflow trough; 193. collecting tank; 20. sedimentation tank; 21. sedimentation tank; 211. collection box; 212. flow trough; 213. sinking channel; 214. overflow trough; 22. medicine tank; 23. stirring device; 24. clear water tank; 25. filter press; 26. building body; 27. silo. DETAILED DESCRIPTION

[0052] The present invention is further described in detail below with reference to the accompanying drawings.

[0053] Example 1

[0054] See also Figures 1 to 12 This embodiment provides a production line for recycling and reusing light materials from construction waste. The production line includes a bouncing screen 1, a sorting room 2, a two-stage shredder, a dry cleaning and air separation system 5, and a washing line. A first belt conveyor 11 is provided downstream of the bouncing screen 1 to receive the product on the screen of the bouncing screen 1. The first belt conveyor 11 passes through the sorting room 2 and delivers the material to the two-stage shredder. The two-stage shredder includes a first-stage shredder 3 and a second-stage shredder 4 connected to each other by a belt conveyor. Figure 2 and Figure 3 The dry cleaning and air separation system 5 includes a dry cleaning machine 6, a discharging belt conveyor 7 and a fan 8. The feed port 64 of the dry cleaning machine 6 is connected to the second-stage shredder 4 through a belt conveyor. The feed end of the discharging belt conveyor 7 is arranged at the discharging port 65 of the dry cleaning machine 6, and the fan 8 is arranged below the discharging end of the discharging belt conveyor 7.

[0055] See also Figure 1 and Figure 2 The water washing line includes a water circulation system and a separator 14, a flushing tank 15 and a drum screen 16 connected in sequence. The separator 14 receives the material from the material receiving belt conveyor 10. The separator 14, the flushing tank 15 and the drum screen 16 are connected to the water circulation system through sewage pipes. The water circulation system is connected to the separator 14 and the flushing tank 15 through clean water pipes. The drum screen 16 is connected to the second baler 17. Figure 1 、 Figure 2 and Figure 9 The water circulation system includes a collection tank 18, an inclined screen filter 19, a sedimentation tank 20, a sedimentation tank 21, and a filter press 25 connected in sequence, wherein the sedimentation tank 21 is connected to the medicine tank 22 and the clean water tank 24 respectively, the separator 14, the flushing tank 15 and the drum screen 16 are connected to the collection tank 18 through sewage pipes respectively, and the clean water tank 24 is connected to the separator 14 and the flushing tank 15 through clean water pipes respectively.

[0056] See also Figure 2 The bouncing screen 1 pre-sorts construction waste by material specific gravity, shape, volume difference, etc. The bouncing screen 1 includes a supporting frame, a power device installed on the supporting frame, a crankshaft installed on the supporting frame and connected to the power device, and eight sieve plates installed in the supporting frame and connected to the crankshaft. The sieve plates are tilted and provided with a plurality of sieve holes and serrations. The tilted sieve plates allow heavy materials on the sieve plates to roll off and be recovered. The crankshaft is driven eccentrically and reciprocatingly by the power device, driving the eight sieve plates to reciprocate up and down in an offset manner, so that light materials on the sieve plates can pass through the serrations on the sieve plates and move upward along the surface of the sieve plates. The bouncing screen 1 adopts conventional products purchased on the market, and its specifications are as follows: the overall dimensions are 3300mm*8000mm*6500mm, the screen plate specifications are 5350mm*290mm, the screen plate material is 16Mn, the screen plate thickness is 5mm, the number of screen plates is 8, the screen hole diameter is 50mm, the crankshaft material is 42Cr, the crankshaft operates in eccentric reciprocating mode, the full-load operation noise is less than 85 decibels, the frequency is 50Hz, the voltage is 380V, and the screening efficiency is greater than 95%.

[0057] In order to facilitate the collection of materials, a recovery bin can be provided just below the inclined bottom end of the sieve plate of the bouncing screen 1 , and a collection bin can be provided just below the sieve holes of the sieve plate of the bouncing screen 1 .

[0058] See also Figure 2 、 Figure 11 and Figure 12The sorting room 2 includes a main body 26, a number of sorting stations and / or sorting equipment arranged in the main body 26, and a silo 27 arranged on the outside of the main body 26 and connected to the bottom of the main body 26 through a channel. The first belt conveyor 11 passes through the main body 26 and extends to the feed point of the first-stage shredder 3. A number of sorting stations and / or sorting equipment are arranged on the same side of the first belt conveyor 11, and the silo 27 is arranged on the other side of the first belt conveyor 11. The main body 26 is a square board room structure, which ensures that the working environment is closed to reduce noise and dust. By placing the silo 27 externally, dust can be prevented from accumulating in the sorting room 2. During implementation, four sorting stations can be set up, and one worker is assigned to each sorting station. The stones, metals, etc. that have been missed by the bouncing screen 1 on the first conveyor belt 11 are further sorted by workers at the sorting equipment and / or sorting stations, and the missed materials are directly picked out from the first conveyor belt 11 and sent to the silo 27. In this way, through the single-sided sorting station and / or sorting equipment layout and the configuration of the opposite silo 27, the distance that workers or equipment need to move is reduced and the sorting efficiency and operational convenience are improved. At the same time, combined with the closed environment of the sorting room 2, the sorting efficiency is improved by about 20% to 30%.

[0059] In order to further improve the efficiency of sorting and recycling, a metal detector or an X-ray sorter can be installed in the main body 26 of the sorting room 2. The metal detector or X-ray sorter can assist in identifying residual metals such as iron and aluminum, thereby reducing the difficulty of sorting and further improving the sorting efficiency.

[0060] See also Figure 2 The blade width of the first-stage shredder 3 is 6mm, and the blade width of the second-stage shredder 4 is 4mm. By adopting a two-stage shredding process, the material is shredded in a gradient from 6mm to 4mm, which can gradually reduce the size of the material, reduce the load of a single machine, avoid overload and make the particle size more uniform. It is also beneficial to the subsequent dry cleaning and air separation system 5's dry cleaning, beating and air separation cleaning, which is beneficial to improving the separation accuracy and sorting efficiency of the plastic film, making the purity and utilization rate of the recycled plastic film higher. The first-stage shredder 3 and the second-stage shredder 4 both use conventional products purchased on the market, such as a 110kW double-shaft shredder purchased from Zhongshan Chuangneng Environmental Protection Equipment Technology Co., Ltd. or Dongguan Saike Machinery Co., Ltd.

[0061] See also Figures 3 to 5The dry cleaning machine 6 includes a mounting frame 61, a dry cleaning drum 62 and a drive device 63 mounted on the mounting frame 61, an inlet 64 and an outlet 65 located at both ends of the dry cleaning drum 62, a screw shaft (not shown) located within the dry cleaning drum 62 and connected to the drive device 63, a discharge port 66 located at the bottom of the dry cleaning drum 62, and a dry cleaning screen (not shown) located at the discharge port 66 and with a gap between it and the screw shaft. The screw shaft is a rotating shaft with spiral blades. The operation process of the dry cleaning machine 6 is as follows: when the material enters the dry cleaning cylinder 62 from the feed port 64, the driving device 63 drives the screw shaft to rotate at high speed. While the screw shaft transports the material from the feed port 64 to the discharge port 65, the spiral blades on the screw shaft will beat the material (that is, dry cleaning), thereby stripping off pollutants such as mud and dust attached to the material. The stripped attached pollutants fall off the dry cleaning screen, and the material after being beaten and cleaned falls out from the discharge port 65.

[0062] By arranging a dry cleaning and air separation system 5 after the two-stage shredding, the attached pollutants can be fully separated from the plastic film, avoiding the following situation: before the front-end plastic film is fully shredded, the plastic films are entangled with each other, and large pieces of plastic film wrap the mud and sand, causing the equipment to be stuck and affecting the operation of the equipment, and at the same time making it impossible to separate the mud and sand, that is, the plastic film is difficult to separate more purely and the sorting efficiency is low, so that high-quality tailings are selected together with ordinary tailings, thereby affecting economic benefits.

[0063] See also Figure 1 and Figure 3 A first baler 9 for baling heavy materials is provided just below the discharge end of the discharge conveyor 7. A receiving belt conveyor 10 for receiving the purer materials containing plastic film blown out by the blower 8 is provided just in front of the discharge end of the discharge conveyor 7. A blanking belt conveyor 67 integrally mounted on the mounting frame 61 is provided just below the bottom of the dry cleaning screen. Figure 1 and Figure 2On the downstream side of the dry cleaning and air separation system 5, that is, downstream of the discharge end of the receiving belt conveyor 10, there is a water-washed raw material yard 12. A vibrating feeder 13 is provided at the water-washed raw material yard 12. The vibrating feeder 13 is arranged upstream of the separator 14 of the water washing line. The vibrating feeder 13 is used to achieve uniform distribution of materials through vibration, thus avoiding clogging of the belt conveyor and preliminarily screening out fine impurities such as debris. The vibrating feeder 13, separator 14, drum screen 16, and second baler 17 are all conventional products available on the market. The separator 14 is used to further separate the plastic film from attached pollutants such as mud and labels; the structure of the separator 14 is similar to that of the dry cleaning machine 6; the beating unit in the separator 14 uses rotating blades to hit the material to remove surface attached pollutants, and the water washing unit in the separator 14 separates impurities through high-pressure spraying (pressure ≥ 2MPa) combined with water flushing. The perforated drum 16 uses centrifugal force to dehydrate and dry the plastic film, removing attached sediment and sand, leaving a pure plastic film with a moisture content of 15% to 20%. The dehydrated plastic film is then packaged by a second baler 17 to increase its density for transport or as a recycled raw material, such as RDF fuel and recycled plastic pellets.

[0064] See also Figure 2 、 Figure 6 、 Figure 7 and Figure 8 The flushing tank 15 includes a tank body 151, a slope 152 provided at the end of the tank body 151, a chain scraper 153 provided in the tank body 151, and a four-stage flushing water pipe 154 provided above the tank body 151. The tank body 151 is an integrated steel structure, with a drain valve 155 provided at the bottom of the tank body 151 and connected to the collection tank 18 through a sewage pipe. One end of the chain scraper 153 is provided on the slope 152; the chain scraper 153 includes a driving sprocket provided on the slope 152, a driving mechanism connected to the driving sprocket, a driven sprocket provided at the other end of the tank body 151 away from the slope 152, a chain connecting the driving sprocket and the driven sprocket, and a plurality of scrapers evenly spaced on the chain. Four flushing pipes 154 are spaced along the length of the tank body 151, with the spacing decreasing from one end of the tank body 151 with the slope 152 to the other. These flushing pipes 154 are connected to the clean water tank 24 via a clean water pipe. The material separated by the separator 14 is received above the end of the tank body 151 with the slope 152. The material falls onto the slope 152 by its own weight, then enters the bottom of the tank body 151 and moves toward the other end of the tank body 151. During this movement, the material is sequentially flushed in a four-stage countercurrent manner by the four flushing pipes 154 above the tank body 151. The wastewater from the bottom of the tank body 151 is discharged through the drain valve 155. Adherent contaminants flushed from the bottom of the tank body 151 are scraped by the chain scraper 153 and automatically collected on the slope 152.

[0065] See also Figure 2 and Figure 9 The inclined screen filter 19 includes a fixed frame 191 fixed to the ground, an overflow trough 192 provided on the fixed frame 191 and connected to the collection tank 18, a filter screen (not shown) provided obliquely on the fixed frame 191 and on one side of the overflow trough 192, and a sump 193 provided directly below the filter screen and connected to the sedimentation tank 20. The sewage collected in the collection tank 18 is pumped upward into the overflow trough 192 via a pump and pipeline. After overflowing from the overflow trough 192, the sewage flows downward along the filter screen. During the flow, the sewage falls through the filter screen under its own weight and is collected in the sump 193, leaving residual plastic film on the surface of the filter screen. In this way, the sewage can be coarsely filtered while the plastic film in the sewage is automatically collected by its own weight, thereby improving operational convenience, production efficiency, and the recycling rate of the plastic film, while also preventing subsequent equipment from clogging.

[0066] See also Figure 2 and Figure 10 The sedimentation tank 21 is provided with a collection box 211 connected to the sedimentation tank 20 and the medicine tank 22 respectively, a sinking channel 213 connected to the collection box 211 through a flow groove 212 and extending to the bottom of the sedimentation tank 21, and an overflow trough 214 connected to the bottom of the sedimentation tank 21 and the clean water tank 24 respectively. The sedimentation tank 20 is located below the sedimentation tank 21, or in other words, below the ground. The sewage in the sedimentation tank 20 and the medicine in the medicine tank 22 are pumped together into the collection box 211 and collected, and then flow through the flow groove 212 to the sinking channel 213, and then through the sinking channel 213 to the bottom of the sedimentation tank 21 to be mixed and collected for chemical precipitation. After precipitation, the clean water overflows from the overflow trough 214, and the sewage continues to remain at the bottom of the sedimentation tank 21. Through the structural design of the sedimentation tank 21, the clean water and the sewage are completely separated, making the obtained clean water clearer and more in line with the reuse standards, solving the problem that the existing technology is difficult to completely separate the clean water and the sewage.

[0067] See also Figure 2 The medicine tank 22 is provided with a stirring device 23. The stirring device 23 includes a stirring shaft provided in the medicine tank 22 and a stirring motor connected to the stirring shaft and provided on the medicine tank 22. The stirring device 23 is used to stir the medicine in the medicine tank 22 evenly, so as to facilitate the subsequent mixing of the medicine with the sewage and improve the removal rate of suspended solids in the sewage. Figure 2 The filter press 25 is a purchased programmable diaphragm plate and frame filter press 25, model XMGZ / -U. This is used to press the sediment at the bottom of the settling tank 21 into a mud cake. The programmable diaphragm plate and frame filter press 25 is effective in filtering the mud cake and can significantly reduce the moisture content of the mud cake.

[0068] Example 2

[0069] See also Figure 1 This embodiment provides a production method for recycling light materials from construction waste using the above-mentioned construction waste light material recycling and reuse production line. The method comprises the following steps:

[0070] S1: Construction waste is loaded onto the bouncing screen 1 by a forklift for pre-sorting, selecting large pieces of concrete, metal, stone powder, sand, and materials containing plastic film. The bouncing screen 1 separates the construction waste into three categories: large, heavy materials such as large pieces of concrete or metal roll off the sieve plate surface of the bouncing screen 1 and are recovered in the recovery bin; small, fine materials such as stone powder or sand fall through the sieve holes of the bouncing screen 1 and are recovered in the collection bin; the remaining materials containing plastic film are moved upward along the sieve surface by the serrations on the sieve plate of the bouncing screen 1 and fall onto the first belt conveyor 11.

[0071] S2: The first belt conveyor 11 delivers the material containing the plastic film to the sorting room 2 for sorting, selects out the missed heavy materials such as stones and iron, and delivers them to the silo 27.

[0072] S3: The first belt conveyor 11 continues to send the sorted plastic film-containing material to the first-stage shredder 3 for first-stage shredding, and then sends the first-stage shredded material to the second-stage shredder 4 through the belt conveyor for second-stage shredding.

[0073] S4: The two-stage shredded materials are sent to the dry cleaning and air separation system 5 through a belt conveyor for dry cleaning, beating and air separation to remove attached pollutants and obtain heavy materials and purer materials containing plastic film. The specific process is as follows: the belt conveyor sends the material containing plastic film from the feed port 64 into the dry cleaning drum 62 of the dry cleaning machine 6. The dry cleaning machine 6 dry-cleans and beats the material and screens out the attached pollutants while sending the material from the feed port 64 to the discharge port 65. The screened attached pollutants such as mud and sand fall onto the blanking belt conveyor 67 to be transported elsewhere for recycling and treatment, while the material coming out of the discharge port 65 falls onto the feed end of the discharge belt conveyor 7. The material is transported from the feed end to the discharge end through the discharge belt conveyor 7. When transported to the discharge end, the heavy materials in the material such as wood chips, rubber, etc. fall into the first baler 9 to be packaged, and the remaining purer materials containing plastic film are selected by the wind from the fan 8 and fall into the receiving belt conveyor 10 to be transported to the water-washed raw material yard 12 for collection.

[0074] S5: The materials at the water-washed raw material yard 12 are loaded into the vibrating feeder 13 by a forklift or a belt conveyor, and the vibrating feeder 13 evenly feeds the materials to the separator 14 through a belt conveyor. The separator 14 then performs beating and water washing to fully clean the materials to separate the impurities. The wastewater generated by the separation is sent to the water circulation system for recycling treatment, and the clean water required for separation is circulated by the water circulation system.

[0075] S6: The separated material containing plastic film is sent to the washing tank 15 through a belt conveyor for washing, wherein the wastewater generated by the washing is sent to the water circulation system for circulation treatment, and the clean water required for washing is circulated by the water circulation system.

[0076] S7: The washed plastic film-containing material is sent to the drum screen 16 for dehydration and screening. The tailings obtained after dehydration, i.e., the pure plastic film, enter the second baler 17 for packaging and storage, and the removed wastewater is sent to the water circulation system for recycling treatment.

[0077] During the above steps S5 to S7, the water circulation system performs the following steps to circulate the sewage and provide the clean water:

[0078] S100: sending sewage (i.e. sewage generated by the separator 14, the washing tank 15 and the drum screen 16) to the collection tank 18 through the sewage pipe for collection;

[0079] S200: The collected sewage is pumped to the inclined mesh filter 19 through a pump and a pipeline for filtration. During filtration, the plastic film in the sewage is automatically collected on the filter screen of the inclined mesh filter 19, and the remaining sewage falls from the filter screen into the water collection tank 193 of the inclined mesh filter 19 for collection;

[0080] S300: The sewage in the water collection tank 193 is pumped to the sedimentation tank 20 through a pump and a pipeline for preliminary natural sedimentation and storage;

[0081] S400: The sewage in the sedimentation tank 20 is pumped into the sedimentation tank 21 through a pump and a pipeline. At the same time, the reagent in the reagent tank 22 after being stirred by the stirring device 23 is also pumped into the sedimentation tank 21, so that the sewage undergoes chemical precipitation in the sedimentation tank 21 under the catalysis of the reagent.

[0082] S500: After chemical precipitation, clean water overflows from the overflow tank 214 of the sedimentation tank 21 and enters the clean water tank 24 through the pipeline. The clean water tank 24 supplies circulating clean water to the separator 14 and the flushing tank 15 through the clean water pipeline. At the same time, the sediment, such as sludge, deposited at the bottom of the sedimentation tank 21 is pumped and piped to the filter press 25 for filtration to obtain mud cakes. The mud cakes are then sold as stone powder.

[0083] S600: The sewage still containing impurities after filtration is continuously pumped to the collection tank 18 for sewage recycling treatment.

[0084] The embodiments of the present invention are described above in conjunction with the accompanying drawings. The embodiments of the present invention and the features thereof may be combined with each other unless there is any conflict. The present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Under the guidance of the present invention, those skilled in the art may devise various forms without departing from the spirit of the present invention and the scope of protection of the claims. All of these forms fall within the scope of protection of the present invention.

Claims

1. A production line for recycling and reusing light materials from construction waste, comprising a bouncing screen (1), characterized in that: The downstream side of the bouncing screen (1) is connected to two or more shredders via a first belt conveyor (11); a sorting room (2) is provided between the bouncing screen (1) and the first-stage shredder (3); the first belt conveyor (11) runs through the sorting room (2); the shredders at each stage are connected via belt conveyors, and the last-stage shredder is connected to a dry cleaning and air separation system (5) via a belt conveyor; The dry cleaning and air separation system (5) includes a dry cleaning machine (6), a discharging belt conveyor (7) and a fan (8), the feed port (64) of the dry cleaning machine (6) is connected to the last-stage shredder through a belt conveyor, the feed end of the discharging belt conveyor (7) is arranged at the discharge port (65) of the dry cleaning machine (6), the fan (8) is arranged on one side of the discharging end of the discharging belt conveyor (7), the discharging end of the discharging belt conveyor (7) is provided with a receiving belt conveyor (10) for receiving the material blown out by the fan (8), and a water washing line is provided on the downstream side of the receiving belt conveyor (10); The water washing line includes a water circulation system and a separator (14), a washing tank (15), and a drum screen (16) connected in sequence, wherein the separator (14) receives materials from a receiving belt conveyor (10); The water circulation system comprises a collection tank (18), an inclined screen filter (19), a sedimentation tank (20), a sedimentation tank (21), and a filter press (25) connected end to end in sequence, wherein the sedimentation tank (21) is connected to the medicine tank (22) and the clean water tank (24) respectively; the separator (14), the flushing tank (15), and the drum screen (16) are connected to the collection tank (18) via sewage pipes, respectively; and the clean water tank (24) is connected to the separator (14) and the flushing tank (15) via clean water pipes.

2. The construction waste light material recycling and reuse production line according to claim 1 is characterized in that: The inclined screen filter (19) comprises a fixed frame (191), an overflow trough (192) provided on the fixed frame (191), a filter screen inclined on the fixed frame (191), and a water collection tank (193) provided directly below the filter screen; the overflow trough (192) is connected to the collection tank (18), the filter screen is provided on one side of the overflow trough (192), and the water collection tank (193) is connected to the sedimentation tank (20).

3. The construction waste light material recycling and reuse production line according to claim 1 is characterized in that: The flushing tank (15) comprises a tank body (151), a slope (152) provided at the end of the tank body (151), a chain plate scraper (153) provided in the tank body (151), and three or more flushing water pipes (154) provided above the tank body (151); the tank body (151) is connected to the collection tank (18) through a sewage pipe, one end of the chain plate scraper (153) is provided on the slope (152), and the three or more flushing water pipes (154) are arranged at intervals along the length direction of the tank body (151). The flushing water pipes (154) are connected to the clean water tank (24) through a clean water pipe, and the upper end of the tank body (151) having the slope (152) receives the material separated by the separator (14).

4. The construction waste light material recycling and reuse production line according to claim 1 is characterized in that: The sedimentation tank (21) is provided with a collection box (211) connected to the sedimentation tank (20) and the medicine tank (22) respectively, a sinking channel (213) connected to the collection box (211) and extending to the bottom of the sedimentation tank (21), and an overflow trough (214) connected to the bottom of the sedimentation tank (21) and the clear water tank (24) respectively.

5. The construction waste light material recycling and reuse production line according to claim 1 is characterized in that: The dry cleaning machine (6) includes a mounting frame (61), a dry cleaning cylinder (62) and a driving device (63) arranged on the mounting frame (61), a feed port (64) and a discharge port (65) arranged at both ends of the dry cleaning cylinder (62), a spiral shaft arranged inside the dry cleaning cylinder (62) and connected to the driving device (63), a drop port (66) arranged at the bottom of the dry cleaning cylinder (62), and a dry cleaning screen arranged at the drop port (66) and having a gap between it and the spiral shaft.

6. The construction waste light material recycling and regeneration production line according to any one of claims 1 to 5, characterized in that: The sorting room (2) includes a room body (26), a plurality of sorting stations and / or sorting equipment arranged in the room body (26), and a silo (27) arranged outside the room body (26) and connected to the bottom of the room body (26) through a channel; Several sorting stations and / or sorting equipment are arranged on the same side of the first belt conveyor (11), and the silo (27) is arranged on the other side of the first belt conveyor (11).

7. A production method for recycling light materials from construction waste using the construction waste light material recycling production line according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1: Send the construction waste to the bouncing screen (1) for pre-sorting, and select large pieces of concrete, metal, stone powder, sand and materials containing plastic film; S2: The material containing the plastic film is sent to the sorting room (2) through the first belt conveyor (11) for further sorting to select stones and metals; S3: The material containing the plastic film after further sorting is sent to a shredder with two or more stages through a first belt conveyor (11) for multi-stage shredding; S4: The multi-stage shredded plastic film-containing material is sent to the dry cleaning and air separation system (5) for further dry cleaning, beating and air separation to remove attached contaminants and obtain wood chips and rubber as well as purer plastic film-containing material; S5: The material containing the plastic film is fed into a separator (14) for impurity separation, and the wastewater generated by the separation is fed into a water circulation system for cyclic treatment, and the clean water required for separation is circulated by the water circulation system; S6: After the impurities are separated, the material containing the plastic film is sent to the washing tank (15) for washing, and the wastewater generated by the washing is sent to the water circulation system for recycling treatment. The clean water required for washing is circulated by the water circulation system; S7: The washed plastic film-containing material is sent to a drum screen (16) for dehydration and screening, and finally a pure plastic film is obtained. The removed wastewater is sent to a water circulation system for recycling treatment.

8. The production method according to claim 7, characterized in that The sewage is sent into the water circulation system for circulation treatment and the clean water is circulated by the water circulation system, which includes the following steps: S100: sending the sewage into a collection tank (18) for collection; S200: The collected sewage is sent to the inclined mesh filter (19) for filtration, and a plastic film is obtained by filtration and automatically collected on the filter screen of the inclined mesh filter (19). At the same time, the filtered sewage falls into the water collection tank (193) of the inclined mesh filter (19) and is automatically collected; S300: sending the sewage in the water collection tank (193) into the sedimentation tank (20) for natural sedimentation and storage; S400: sending the sewage in the sedimentation tank (20) and the reagent in the reagent tank (22) into the sedimentation tank (21) for chemical precipitation; S500: sending the clean water overflowing from the sedimentation tank (21) into the clean water tank (24) and circulating the clean water from the clean water tank (24), while sending the sediment deposited at the bottom of the sedimentation tank (21) into the filter press (25) for filtration to obtain a mud cake; S600: The wastewater produced by the filter press is sent to a collection tank (18).

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