A complete set of equipment for dry preparation of engineered soil recycled sand

Abstract

The application discloses a complete set of equipment for preparing engineering slag soil regenerated sand by a dry method. The equipment comprises a soil pulverizer, a drying device, a mud-sand separator, a screening machine and a conveyor. The soil pulverizer is used for initially scattering the engineering slag soil; the drying device is used for drying the initially scattered engineering slag soil; the mud-sand separator is used for separating sand particles and residual mud in the dried engineering slag soil; and the screening machine is used for screening out the residual mud in the sand particles to obtain the engineering slag soil regenerated sand. The application solves the technical problem that the prior art cannot continuously prepare the engineering slag soil regenerated sand by the dry method, significantly improves the yield and efficiency of the dry preparation of the engineering slag soil regenerated sand, and lays a solid foundation for subsequent large-scale application of the engineering slag soil regenerated sand prepared by the dry method in engineering. The mud content of the engineering slag soil regenerated sand prepared by the application is significantly reduced, and accordingly, the application amount of the engineering slag soil regenerated sand in concrete and cement mortar can be further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of resource utilization of construction solid waste, and particularly relates to a complete set of equipment for preparing engineering muck regeneration sand by dry method. BACKGROUND

[0002] For the increasing amount of engineering muck, the traditional simple and disordered treatment method has problems such as high energy consumption and pollution, low economic benefit, and even causes engineering disasters.

[0003] Construction sand is an indispensable raw material for infrastructure construction such as buildings, roads, bridges, and water conservancy. Therefore, finding new sources of construction sand is particularly important to alleviate the shortage of domestic natural sand resources.

[0004] As described above, the amount of engineering muck generated by current infrastructure projects is very large. The physical properties of the sand particles contained therein are close to those of construction sand, and it can be used as a substitute for construction sand. The conventional method is to use wet screening method to treat engineering muck to obtain engineering muck regeneration sand, but in actual production process, the wet screening method needs to add flocculants to accelerate the sedimentation of soil particles in the slurry, thereby causing a large amount of flocculants to remain in the related products (for example, engineering muck regeneration sand, mud cake, and sand washing water), and the flocculants remaining in the engineering muck regeneration sand will adversely affect the workability and mechanical properties of the subsequent prepared concrete; at the same time, how to treat the sand washing water and mud cake containing a large amount of flocculants is also a problem that needs to be treated with caution. In addition, the plants using the wet screening method to prepare engineering muck regeneration sand need to be equipped with large facilities such as water storage tanks and slurry sedimentation tanks, which have large land occupation and high initial investment.

[0005] Compared with the wet screening method, the dry method for preparing engineering muck regeneration sand does not need to add any chemical reagent in the whole treatment process, and it is a relatively green and environmentally friendly treatment method. However, the preparation process of engineering muck regeneration sand by dry method is still only at the laboratory stage (such as CN 109721310A and CN 115159885A), the treatment speed is very slow, the output per unit time is very low, the mud content of the engineering muck regeneration sand is high, and the flow line continuous treatment cannot be realized. For example, in order to separate the mud and sand in the engineering muck, the engineering muck needs to be rolled for a long time (note: 20 kg of engineering muck needs to be rolled for at least 15 min), and then the rolled engineering muck is transferred to the screening equipment for subsequent treatment. Since the rolled engineering muck contains a large amount of residual mud, the screening equipment cannot be screened clean in a short time, so batch screening is required, each batch screening lasts at least 15 min, resulting in a long preparation process of engineering muck regeneration sand, which can only barely meet the small batch test demand, and cannot meet the large batch engineering application demand.

[0006] Therefore, the prior art cannot achieve continuous preparation of engineering slag soil recycled sand by using dry method. Therefore, if a set of equipment capable of continuously preparing engineering slag soil recycled sand by using dry method can be designed and built, the above problems will be solved. However, there is no precedent for the design and construction of the related complete equipment. SUMMARY

[0007] The prior art cannot achieve continuous preparation of engineering slag soil recycled sand by using dry method. The present application provides a complete set of equipment for preparing engineering slag soil recycled sand by dry method, which significantly improves the yield and efficiency of engineering slag soil recycled sand prepared by dry method.

[0008] In order to achieve the purpose of the present application, the present application provides a complete set of equipment for preparing engineering slag soil recycled sand by dry method, which comprises a soil pulverizer, a drying device, a mud-sand separator and a screening machine.

[0009] The soil pulverizer is used for primary dispersion of engineering slag soil.

[0010] The drying device is a rotary dryer or a microwave dryer, which is used for drying the primary dispersed engineering slag soil.

[0011] The mud-sand separator is used for secondary dispersion of the dried engineering slag soil to separate the sand particles and residual mud.

[0012] The screening machine is used for screening out residual mud in the sand particles to obtain engineering slag soil recycled sand.

[0013] Further, the conveyor comprises a first conveyor, a second conveyor, a third conveyor and a fourth conveyor. The first conveyor is located at the input end of the soil pulverizer and is used to feed the engineering slag soil into the soil pulverizer. The second conveyor is located between the soil pulverizer and the drying device. The third conveyor is located between the drying device and the mud-sand separator. The fourth conveyor is located between the mud-sand separator and the screening machine.

[0014] Further, the soil pulverizer comprises a soil pulverizer cavity, a soil pulverizer feed inlet, a soil pulverizer main shaft, a soil pulverizer chain and a soil pulverizer motor. The soil pulverizer feed inlet communicates with the soil pulverizer cavity, and the soil pulverizer main shaft is located in the soil pulverizer cavity. One end of the soil pulverizer chain is fixed on the soil pulverizer main shaft. The soil pulverizer is connected with the soil pulverizer main shaft to control the rotation speed of the soil pulverizer main shaft by the motor.

[0015] Further, the rotary dryer comprises a feeder, a drying cylinder, an exhaust, a first motor for the rotary dryer, and a second motor for the rotary dryer; the first motor for the rotary dryer is used to control the feeding speed of the feeder; the feeder is used to send the construction waste into the drying cylinder; the second motor for the rotary dryer is used to control the rotating speed of the drying cylinder; the drying cylinder is used to dry the material; the exhaust is communicated with the drying cylinder and is used to exhaust the wet air inside the drying cylinder.

[0016] Further, the microwave dryer comprises a plurality of drying boxes, a dehumidifying pipe, a dehumidifier, a motor for the microwave dryer, a rotating shaft for the microwave dryer, and a conveyor belt for the microwave dryer; the drying boxes are internally provided with microwave generators with adjustable power, which are used to dry the construction waste; the wet air inside the drying boxes is exhausted through the dehumidifying pipe and the dehumidifier; the conveyor belt for the microwave dryer sequentially passes through all the drying boxes; the motor for the microwave dryer is connected with the rotating shaft for the microwave dryer; the rotating shaft for the microwave dryer is connected with the conveyor belt for the microwave dryer; the motor for the microwave dryer is used to control the rotating speed of the rotating shaft for the microwave dryer, so as to control the speed of the conveyor belt for the microwave dryer.

[0017] Further, the mud-sand separator comprises a mud-sand separator cavity, a mud-sand separator feeding port, a suction port, a first mud-sand separator discharging port, a second mud-sand separator discharging port, an air inlet volute, a first air inlet pipe, a second air inlet pipe, a first air outlet pipe, a second air outlet pipe, a residual mud storage tank, an analyzer, a mud-sand separator main shaft, a hammer piece, a mud-sand separator chain, a wire brush, a first motor for the mud-sand separator, a second motor for the mud-sand separator, a third motor for the mud-sand separator, and a pulse dust removal device.

[0018] The first mud-sand separator discharging port is located at the lower end of the mud-sand separator cavity; the second mud-sand separator discharging port is located at the lower end of the residual mud storage tank.

[0019] The analyzer is located above the inside of the mud-sand separator cavity and comprises a blade that can rotate, and the rotating speed of the blade is controlled by the third motor for the mud-sand separator; the analyzer is used to control the particle size of the residual mud entering the residual mud storage tank.

[0020] The mud-sand separator feeding port and the suction port are located at the upper end of the mud-sand separator cavity, and the residual mud leaves the mud-sand separator cavity through the suction port.

[0021] The mud-sand separator main shaft is located inside the mud-sand separator cavity and below the analyzer, and the rotating speed of the mud-sand separator main shaft is controlled by the first motor for the mud-sand separator; the hammer piece, the mud-sand separator chain, and the wire brush are all fixed on the mud-sand separator main shaft to perform secondary scattering on the dried construction waste.

[0022] Two ends of the first air inlet pipe are connected with the sludge separator cavity and the air inlet volute respectively; two ends of the first air outlet pipe are connected with the sludge separator cavity and the residual sludge storage tank respectively; two ends of the second air inlet pipe are connected with the residual sludge storage tank and the air inlet volute respectively; two ends of the second air outlet pipe are connected with the first air inlet pipe and the pulse dust removal device respectively.

[0023] The air volume generated by the air inlet volute is determined by the rotating speed of the second motor of the sludge separator.

[0024] Further, the particle size of the residual sludge in the residual sludge storage tank is not greater than 0.15 mm.

[0025] Further, the screening machine sequentially comprises a screening machine feed inlet, a first screen, a screening machine first discharge port, a second screen, a screening machine second discharge port and a screening machine third discharge port from top to bottom.

[0026] The screening machine first discharge port is used for discharging particles with a particle size greater than 4.75 mm; the screening machine second discharge port is used for discharging the engineering soil regenerated sand; and the screening machine third discharge port is used for discharging the residual sludge.

[0027] Further, the motor for the silt machine, the first motor for the sludge separator, the second motor for the sludge separator, the third motor for the sludge separator, the first motor for the rotary dryer, the second motor for the rotary dryer and the motor for the microwave dryer are all variable frequency motors.

[0028] Compared with the prior art, the application has at least the following advantages and effects:

[0029] (1) The complete set of equipment for dry preparation of engineering soil regenerated sand provides a new production process for engineering soil regenerated sand, and the produced regenerated sand no longer contains residual flocculants, thereby completely solving the problem that the residual flocculants in the engineering soil regenerated sand prepared in batches by the water washing method adversely affect the performance of concrete.

[0030] (2) The sludge separator in the complete set of equipment for dry preparation of engineering soil regenerated sand can realize continuous sludge separation through the combination of "scattering + air separation", thereby breaking through the dilemma that the traditional "wheel grinding + screening" combination can only realize intermittent sludge separation.

[0031] (3) The complete set of equipment for dry preparation of engineering soil regenerated sand contains simple treatment equipment, each treatment equipment has the ability of continuous treatment, the treatment equipment can be connected through a conventional conveyor, and manual carrying is not needed, so that the automatic production process is realized to the greatest extent.

[0032] (4) The content of mud of the engineering slag soil regenerated sand prepared by the complete set of equipment for dry preparation of engineering slag soil regenerated sand in the application is significantly lower than that of the engineering slag soil regenerated sand prepared by the existing dry preparation technology, so the application amount of the engineering slag soil regenerated sand in concrete and cement mortar can be further improved;

[0033] (5) The relative positions between the treatment devices in the application can be flexibly arranged according to the field conditions, so as to maximize the reduction of the floor area of the complete set of equipment, thereby greatly reducing the cost investment of the treatment devices and the site; meanwhile, the types of the drying devices can be selected according to the energy supply mode of the site. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a structural framework diagram of the complete set of equipment for dry preparation of engineering slag soil regenerated sand provided by the embodiment of the application;

[0035] Figure 2 is a whole structure schematic diagram of the complete set of equipment for dry preparation of engineering slag soil regenerated sand using a rotary drying machine as a drying device provided by the embodiment of the application;

[0036] Figure 3 is a whole structure schematic diagram of the complete set of equipment for dry preparation of engineering slag soil regenerated sand using a microwave drying machine as a drying device provided by the embodiment of the application;

[0037] Figure 4 is a partial structure schematic diagram of a silt machine in the complete set of equipment for dry preparation of engineering slag soil regenerated sand provided by the embodiment of the application;

[0038] Figure 5 is a structure schematic diagram of a mud sand separator in the complete set of equipment for dry preparation of engineering slag soil regenerated sand provided by the embodiment of the application;

[0039] Figure 6 is a partial structure schematic diagram of a mud sand separator in the complete set of equipment for dry preparation of engineering slag soil regenerated sand provided by the embodiment of the application;

[0040] In the figure: 1-powder soil machine; 2-mud sand separator; 3-screening machine; 4-turning dryer; 5-microwave dryer; 6-first conveyor; 7-second conveyor; 8-third conveyor; 9-fourth conveyor; 101-powder soil machine cavity port; 102-powder soil machine feed port; 103-powder soil machine main shaft; 104-powder soil machine iron chain; 105-powder soil machine motor; 201-mud sand separator cavity; 202-mud sand separator feed port; 203-suction port; 204-mud sand separator first discharge port; 205-mud sand separator second discharge port; 206-inlet volute; 207-first air inlet pipe; 208-second air inlet pipe; 209-first exhaust pipe; 210-second exhaust pipe; 211-residual mud storage tank; 212-analyzer; 213-mud sand separator main shaft; 214-hammer; 215-mud sand separator chain; 216-brush; 217-mud sand separator first motor; 218-mud sand separator second motor; 219-mud sand separator third motor; 220-pulse dust removal device; 301-screening machine feed port; 302-first screen; 303-screening machine first discharge port; 304-second screen; 305-screening machine second discharge port; 306-screening machine third discharge port; 401-feeder; 402-drying cylinder; 403-exhaust machine; 404-turning dryer first motor; 405-turning dryer second motor; 501-drying box; 502-damp pipe; 503-damp machine; 504-microwave dryer motor; 505-microwave dryer rotating shaft and 506-microwave dryer conveyor belt. DETAILED DESCRIPTION

[0041] The application will be further described in conjunction with the embodiments and drawings, but the embodiments of the application are not limited thereto. It should be noted that the processes not particularly described below can be implemented by referring to the prior art by those skilled in the art.

[0042] Please refer to Figures 1-6 The application provides a complete set of equipment for preparing engineering slag soil regenerated sand by dry method, which comprises a powder soil machine 1, a drying device, a mud sand separator 2, a screening machine 3 and a conveyor.

[0043] The powder soil machine 1 is used for primary dispersion of the engineering slag soil.

[0044] The drying device is a turning dryer 4 or a microwave dryer 5, which is used for drying the primary dispersed engineering slag soil. Figure 2 The drying device in the application is a turning dryer 4, Figure 3 The drying device in the application is a microwave dryer 5.

[0045] The mud sand separator 2 is used for secondary dispersion of the dried engineering slag soil, so as to separate the sand particles and residual mud.

[0046] The screening machine 3 is used for screening the residual mud in the sand particles to obtain the engineering muck regenerated sand.

[0047] The conveyor includes a first conveyor 6, a second conveyor 7, a third conveyor 8 and a fourth conveyor 9. In some embodiments of the present application, the first conveyor 6 is a belt conveyor located at the input end of the silt machine 1, used for conveying the engineering muck into the silt machine 1; the second conveyor 7 is a belt conveyor located between the silt machine 1 and the drying device; the third conveyor 8 is a spiral feeder located between the drying device and the mud-sand separator 2; and the fourth conveyor 9 is a spiral feeder located between the mud-sand separator 2 and the screening machine 3.

[0048] In some embodiments of the present application, the silt machine 1 includes a silt machine cavity 101, a silt machine feed port 102, a silt machine main shaft 103, a silt machine chain 104 and a silt machine motor 105; the silt machine feed port 102 is communicated with the silt machine cavity 101; the silt machine main shaft 103 is located in the silt machine cavity 101; one end of the silt machine chain 104 is fixed on the silt machine main shaft 103; and the silt machine motor 105 is used to control the rotation speed of the silt machine main shaft 103, thereby driving the silt machine chain 104 to perform primary dispersion on the engineering muck.

[0049] In some embodiments of the present application, the silt machine chain 104 is an iron chain.

[0050] In some embodiments of the present application, the rotary dryer 4 includes a feeder 401, a drying cylinder 402, an exhaust machine 403, a first rotary dryer motor 404 and a second rotary dryer motor 405; the feeder 401 includes a spiral shaft, the first rotary dryer motor 404 is connected with the spiral shaft to control the rotation speed of the spiral shaft, and the material entering the spiral shaft will advance under the rotation of the spiral shaft, thereby conveying the material into the drying cylinder 402, and the feeding speed of the feeder 401 can be controlled by controlling the rotation speed of the first rotary dryer motor 404; the output end of the second rotary dryer motor 405 is connected with the drying cylinder 402, and the second rotary dryer motor 405 is used to control the rotation speed of the drying cylinder 402, thereby controlling the discharging speed; the drying cylinder 402 is used for drying the material; and the exhaust machine 403 is communicated with the drying cylinder 402, and is used for exhausting the wet air inside the drying cylinder 402.

[0051] In some embodiments of the present application, the microwave dryer 5 comprises a plurality of drying boxes 501, a moisture removal pipe 502, a moisture removal machine 503, a microwave dryer motor 504, a microwave dryer rotating shaft 505 and a microwave dryer conveyor belt 506; the drying box 501 is internally provided with a microwave generator with adjustable power, which is used for drying the construction waste; the wet air inside the drying box 501 is discharged through the moisture removal pipe 502 and the moisture removal machine 503; the microwave dryer conveyor belt 506 sequentially passes through all the drying boxes 501; the microwave dryer motor 504 is connected with the microwave dryer rotating shaft 505; the microwave dryer rotating shaft 505 is connected with the microwave dryer conveyor belt 506; the microwave dryer motor 504 is used for controlling the rotating speed of the microwave dryer rotating shaft 505, so as to control the speed of the microwave dryer conveyor belt 506.

[0052] In some embodiments of the present application, the sludge separator 2 comprises a sludge separator cavity 201, a sludge separator feed inlet 202, a material suction inlet 203, a sludge separator first discharge outlet 204, a sludge separator second discharge outlet 205, an air inlet volute 206, a first air inlet pipe 207, a second air inlet pipe 208, a first air outlet pipe 209, a second air outlet pipe 210, a residual sludge storage tank 211, an analysis machine 212, a sludge separator main shaft 213, a hammer piece 214, a sludge separator chain 215, a wire brush 216, a first sludge separator motor 217, a second sludge separator motor 218, a third sludge separator motor 219 and a pulse dust removal device 220.

[0053] The sludge separator first discharge outlet 204 is located at the lower end of the sludge separator cavity 201; the sludge separator second discharge outlet 205 is located at the lower end of the residual sludge storage tank 211.

[0054] The analysis machine 212 is located above the inside of the sludge separator cavity 201 and comprises a blade that can rotate, and the rotating speed is controlled by the third sludge separator motor 219; the analysis machine 212 is used for controlling the particle size of the residual sludge entering the residual sludge storage tank 211;

[0055] The sludge separator feed inlet 202 and the material suction inlet 203 are located at the upper end of the sludge separator cavity 201, and the residual sludge leaves the sludge separator cavity 201 through the material suction inlet 203;

[0056] The sludge separator main shaft 213 is located inside the sludge separator cavity 201 and below the analysis machine 212, and the rotating speed is controlled by the first sludge separator motor 217; the hammer piece 214, the sludge separator chain 215 and the wire brush 216 are all fixed on the sludge separator main shaft 213 to perform secondary dispersion on the dried construction waste;

[0057] The third motor 219 for the sludge separator is located on the outer wall of the sludge separator cavity 201, and its output end is connected with the analyzer 212; the third motor 219 for the sludge separator is used to control the rotating speed of the analyzer 212, thereby adjusting the particle size of the residual sludge after passing through the analyzer 212; specifically, the rotating shaft of the analyzer 212 is connected with the third motor 219 for the sludge separator, and blades are arranged on the rotating shaft; through the high-speed rotating blades, the particles with small particle size move fast and can pass through the blade gap, while the particles with large particle size move relatively slowly and cannot pass through; one end of the first air inlet pipe 207 is connected with the lower end of the sludge separator cavity 201, and the other end is connected with the air inlet volute 206; one end of the first air outlet pipe 209 is connected with the upper end of the sludge separator cavity 201, and the other end is connected with the upper end of the residual sludge storage tank 211; the particle size of the residual sludge in the residual sludge storage tank 211 is not greater than 0.15 mm; one end of the second air inlet pipe 208 is connected with the upper end of the residual sludge storage tank 211, and the other end is connected with the air inlet volute 206; one end of the second air outlet pipe 210 is connected with the middle part of the first air inlet pipe 207, and the other end is connected with the pulse dust removal device 220.

[0058] The first motor 217 for the sludge separator is arranged close to the sludge separator cavity 201, and its output end is connected with the sludge separator main shaft 213, which is used to control the rotating speed of the sludge separator main shaft 213, thereby driving the hammer 214, the sludge separator chain 215 and the wire brush 216 arranged in the height direction on the sludge separator main shaft 213 in sequence to disperse the dried engineering spoil; the hammer 214 is used to preliminarily disperse, the sludge separator chain 215 is used to further disperse, and the wire brush 216 is used to remove the residual sludge attached to the sand particles in the engineering spoil to the maximum extent, thereby dispersing the material entering the sludge separator cavity 201 from coarse to fine; the second motor 218 for the sludge separator is used to control the rotation of the fan blades in the air inlet volute 206, thereby generating wind; the rotating speed of the second motor 218 for the sludge separator determines the rotating speed of the fan blades in the air inlet volute 206, thereby controlling the air volume entering 201; the wind in the air inlet volute 206 enters the sludge separator cavity 201 from below through the first air inlet pipe 207, and then moves upward with the solid particles; the particles with a particle size greater than 0.15 mm cannot pass through the analyzer 212, and the particles with a particle size less than 0.15 mm pass through the analyzer 212 and then enter the first air outlet pipe 209 from the material suction port 203 to leave the sludge separator cavity 201, and then enter the residual sludge storage tank 211; the particles gradually precipitate, the wind enters the air inlet volute 206 again through the second air inlet pipe 208 to start the next cycle, and the excess wind enters the pulse dust removal device 220 through the second air outlet pipe 210 and is then discharged; the first discharge port 204 of the sludge separator is used for the discharge of the regenerated sand of the engineering spoil mixed with residual residual sludge; and the second discharge port 205 of the sludge separator is used for the discharge of the residual sludge.

[0059] In some embodiments of the present application, the wire brush 216 is a metal wire brush, such as an iron wire brush.

[0060] In some embodiments of the present application, the materials of the hammer 214 and the mud-sand separator chain 215 are iron.

[0061] In some embodiments of the present application, the screening machine 3 comprises a screening machine feed inlet 301, a first screen 302, a screening machine first discharge outlet 303, a second screen 304, a screening machine second discharge outlet 305, and a screening machine third discharge outlet 306; the screening machine feed inlet 301 is located at the upper end of the screening machine 3, and the construction waste is first fed into the screening machine feed inlet 301, then passes through the first screen 302 and the second screen 304 from top to bottom, the first screen 302 has the largest aperture, and is located above the second screen 304.

[0062] In some embodiments of the present application, the aperture of the first screen 302 is 4.75 mm, and the aperture of the second screen 304 is 0.15 mm.

[0063] The screening machine first discharge outlet 303 is responsible for discharging the first screen 302, i.e. discharging the particles with a particle size greater than 4.75 mm; the screening machine second discharge outlet 305 is responsible for discharging the second screen 304, i.e. discharging the construction waste recycled sand; and the screening machine third discharge outlet 306 is responsible for discharging the remaining mud.

[0064] The first screen 302 and the second screen 304 are used to screen the construction waste, so as to ensure that the particle size of the construction waste recycled sand obtained finally meets the requirement of 0.15-4.75 mm of the construction sand standard.

[0065] In some embodiments of the present application, the silt machine motor 105, the first motor 217 for the mud-sand separator, the second motor 218 for the mud-sand separator, the third motor 219 for the mud-sand separator, the first motor 404 for the rotary dryer, the second motor 405 for the rotary dryer, and the motor 504 for the microwave dryer are all variable frequency motors.

[0066] The complete set of equipment for dry preparation of engineering slag soil recycled sand is provided by the foregoing embodiment. The engineering slag soil is transported to the site of the equipment after being excavated from the construction site. The engineering slag soil is transported to the pulverizer 1 by the first conveyor 6 for primary dispersion. The engineering slag soil after primary dispersion by the pulverizer 1 is sent to the drying equipment by the second conveyor 7 for drying. The dried engineering slag soil is sent to the mud sand separator 2 by the third conveyor 8 for secondary dispersion, so that the sand particles and residual mud that are bonded together are separated. At the same time, the sand particles and most of the residual mud are discharged at different discharge ports by blowing air into the cavity from bottom to top. Finally, the sand particles discharged from the first discharge port 204 of the mud sand separator are sent to the screening machine 3 by the fourth conveyor 9 for screening. The material discharged from the second discharge port 305 of the screening machine is the engineering slag soil recycled sand, and the material discharged from the third discharge port 306 of the screening machine is the residual mud. It is detected that the mud content of the engineering slag soil recycled sand produced by the complete set of equipment for dry preparation of engineering slag soil recycled sand is 1%-4%.

[0067] As the existing dry preparation technology of engineering slag soil recycled sand, the dried engineering slag soil is often put into a roller mill for a certain period of time (note: 20 kg of engineering slag soil needs to be rolled for at least 15 minutes) to separate most of the sand particles from the residual mud in the engineering slag soil. Therefore, the yield and efficiency of the dry preparation of engineering slag soil recycled sand are severely limited, which is one of the main reasons why it is impossible to continuously prepare engineering slag soil recycled sand using dry method. At the same time, the rolled engineering slag soil contains a large amount of residual mud, which cannot be screened out in a short time using a screening machine. Therefore, when using the screening machine for screening, the discharge port of the engineering slag soil recycled sand needs to be closed first, and then the rolled engineering slag soil (for example: 20 kg of engineering slag soil) is screened in batches, each batch takes at least 15 minutes, and then the discharge port is opened to discharge the engineering slag soil recycled sand. This is also one of the main reasons why it is impossible to continuously prepare engineering slag soil recycled sand using dry method. Therefore, the dry preparation of engineering slag soil recycled sand cannot achieve mass production at present, which severely limits the application and promotion of dry preparation of engineering slag soil recycled sand in actual engineering.

[0068] To solve the above problems, the foregoing embodiment of the present application first integrates the existing equipment capable of continuous treatment and designs the mud and sand separator capable of realizing continuous engineering sludge and sand separation, so that the sand particles and residual mud in the engineering sludge can be continuously separated, most of the residual mud is carried by the wind to the residual mud storage tank for storage and discharge, only a small part of the residual mud is mixed with the engineering sludge recycled sand, the screening pressure of the subsequent screening machine is greatly reduced, the discharge outlet of the engineering sludge recycled sand does not need to be closed when the screening machine is used, and therefore continuous screening using the screening machine can be realized. In summary, the mud and sand separator in the present application solves the problem that the existing technology cannot realize continuous engineering sludge and sand separation, so that the whole production equipment of the present application can realize continuous preparation of engineering sludge recycled sand by using the dry method, greatly improves the yield of the engineering sludge recycled sand prepared by the dry method, and the recycled sand has no residual flocculating agent, which lays a solid foundation for subsequent realization of large-scale application of the engineering sludge recycled sand prepared by the dry method in engineering. Before this, there is no related report on design and construction of the whole production equipment for preparation of the engineering sludge recycled sand by the dry method at home and abroad.

[0069] The method according to the present application can also develop a series of embodiments, and any change, modification, substitution, combination, simplification made without departing from the spirit and principle of the present application is equivalent to the replacement manner and is included in the protection scope of the present application.

Claims

1. A complete set of equipment for dry preparation of recycled sand from engineering waste, characterized in that, It includes a soil pulverizer (1), a drying equipment, a mud and sand separator (2), and a screening machine (3); The soil pulverizer (1) is used to initially break up the engineering waste soil; The drying equipment is a rotary dryer (4) or a microwave dryer (5), used to dry the engineering slag after initial dispersal; The mud and sand separator (2) is used to further break up the dried engineering waste soil so as to separate the sand particles and residual mud. The screening machine (3) is used to screen out the residual mud in the sand particles to obtain recycled sand from engineering waste soil; The pulverizer (1) includes a pulverizer cavity (101), a pulverizer inlet (102), a pulverizer main shaft (103), a pulverizer chain (104), and a pulverizer motor (105); the pulverizer inlet (102) is connected to the pulverizer cavity (101); the pulverizer main shaft (103) is located inside the pulverizer cavity (101); one end of the pulverizer chain (104) is fixed on the pulverizer main shaft (103); the pulverizer motor (105) is connected to the pulverizer main shaft (103) to control the rotation speed of the pulverizer main shaft (103); The mud and sand separator (2) includes a mud and sand separator chamber (201), a mud and sand separator feed inlet (202), a suction port (203), a mud and sand separator first discharge port (204), a mud and sand separator second discharge port (205), an air inlet volute (206), a first air inlet pipe (207), a second air inlet pipe (208), a first exhaust pipe (209), a second exhaust pipe (210), a residual mud storage tank (211), an analyzer (212), a mud and sand separator main shaft (213), hammers (214), a mud and sand separator chain (215), a wire brush (216), a first motor for the mud and sand separator (217), a second motor for the mud and sand separator (218), a third motor for the mud and sand separator (219), and a pulse dust removal device (220). The first discharge port (204) of the mud and sand separator is located at the lower end of the mud and sand separator cavity (201); the second discharge port (205) of the mud and sand separator is located at the lower end of the residual mud storage tank (211); The analyzer (212) is located above the inside of the mud and sand separator chamber (201), and includes rotatable blades. The rotation speed is controlled by the third motor (219) of the mud and sand separator. The analyzer (212) is used to control the particle size of the residual mud entering the residual mud storage tank (211). The feed inlet (202) and suction inlet (203) of the mud and sand separator are located at the upper end of the mud and sand separator cavity (201), and the residual mud leaves the mud and sand separator cavity (201) through the suction inlet (203). The main shaft (213) of the mud and sand separator is located inside the mud and sand separator cavity (201) and below the analyzer (212). The rotation speed is controlled by the first motor (217) of the mud and sand separator. The hammer (214), the mud and sand separator chain (215) and the wire brush (216) are all fixed on the main shaft (213) of the mud and sand separator to further break up the dried engineering slag. The two ends of the first air inlet pipe (207) are respectively connected to the mud and sand separator chamber (201) and the air inlet volute (206); the two ends of the first exhaust pipe (209) are respectively connected to the mud and sand separator chamber (201) and the residual mud storage tank (211); the two ends of the second air inlet pipe (208) are respectively connected to the residual mud storage tank (211) and the air inlet volute (206); the two ends of the second exhaust pipe (210) are respectively connected to the first air inlet pipe (207) and the pulse dust removal device (220).

2. The complete set of equipment for dry preparation of recycled sand from engineering waste as described in claim 1, characterized in that, It also includes conveyors, which include a first conveyor (6), a second conveyor (7), a third conveyor (8) and a fourth conveyor (9). The first conveyor (6) is located at the input end of the pulverizer (1) and is used to send the engineering waste soil into the pulverizer (1). The second conveyor (7) is located between the pulverizer (1) and the drying equipment. The third conveyor (8) is located between the drying equipment and the mud and sand separator (2). The fourth conveyor (9) is located between the mud and sand separator (2) and the screening machine (3).

3. The complete set of equipment for dry preparation of recycled sand from engineering waste as described in claim 1, characterized in that, The rotary dryer (4) includes a feeder (401), a drying cylinder (402), an exhaust fan (403), a first motor (404) for the rotary dryer, and a second motor (405) for the rotary dryer. The first motor (404) for the rotary dryer is used to control the feeding speed of the feeder (401), which is used to feed the engineering waste into the drying cylinder (402). The second motor (405) for the rotary dryer is used to control the rotation speed of the drying cylinder (402), which is used to dry the material. The exhaust fan (403) is connected to the drying cylinder (402) and is used to discharge the humid air inside the drying cylinder (402).

4. The complete set of equipment for dry preparation of recycled sand from engineering waste as described in claim 1, characterized in that, The microwave dryer (5) includes multiple drying chambers (501), a dehumidification pipe (502), a dehumidifier (503), a microwave dryer motor (504), a microwave dryer shaft (505), and a microwave dryer conveyor belt (506). The drying chamber (501) is equipped with an adjustable power microwave generator for drying engineering waste soil. The humid air inside the drying chamber (501) is discharged through the dehumidification pipe (502) and the dehumidifier (503). The microwave dryer conveyor belt (506) passes through all the drying chambers (501) in sequence. The microwave dryer motor (504) is connected to the microwave dryer shaft (505), and the microwave dryer shaft (505) is connected to the microwave dryer conveyor belt (506). The microwave dryer motor (504) is used to control the rotation speed of the microwave dryer shaft (505), thereby controlling the speed of the microwave dryer conveyor belt (506).

5. The complete set of equipment for dry preparation of recycled sand from engineering waste as described in claim 1, characterized in that, The air volume generated by the air inlet volute (206) is determined by the rotational speed of the second motor (218) used in the mud and sand separator.

6. The complete set of equipment for dry preparation of recycled sand from engineering waste as described in claim 1, characterized in that, The particle size of the residual sludge in the residual sludge storage tank (211) is no greater than 0.15 mm.

7. The complete set of equipment for dry preparation of recycled sand from engineering waste as described in claim 1, characterized in that, The screening machine (3) includes, from top to bottom, a screening machine inlet (301), a first screen (302), a screening machine first outlet (303), a second screen (304), a screening machine second outlet (305), and a screening machine third outlet (306). The first discharge port (303) of the screening machine is used for discharging particles with a diameter greater than 4.75 mm; the second discharge port (305) of the screening machine is used for discharging recycled sand from engineering waste; and the third discharge port (306) of the screening machine is used for discharging residual mud.

8. A complete set of equipment for dry preparation of recycled sand from engineering waste soil according to any one of claims 1-7, characterized in that, The motors (105) for the pulverizer, (217) for the first motor for the mud and sand separator, (218) for the second motor for the mud and sand separator, (219) for the third motor for the mud and sand separator, (404) for the first motor for the rotary dryer, (405) for the second motor for the rotary dryer, and (504) for the microwave dryer are all variable frequency motors.

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