CN111268930B

CN111268930B - Industrial recycling method for building residue soil with high sand and stone content

Info

Publication number: CN111268930B
Application number: CN201811478720.3A
Authority: CN
Inventors: 何志勇; 胡永乐; 吴云强; 夏悠扬
Original assignee: Changsha University of Science and Technology
Current assignee: Changsha University of Science and Technology
Priority date: 2018-12-05
Filing date: 2018-12-05
Publication date: 2021-11-02
Anticipated expiration: 2038-12-05
Also published as: CN111268930A

Abstract

The invention provides a method for industrially recycling building muck with high sand content, which comprises the steps of mud-sand slurry making and water soluble separation, sand-stone separation and screening and mud treatment, wherein the building muck excavated from a building construction site is treated on site, sand, stone and soil in the building muck are separated, the soil is respectively fired, and the sand and stone are used as concrete raw materials for production, so that the problem of urban muck treatment is effectively solved, and the problems of sand-stone supply shortage and the like in the building construction process can be solved.

Description

Industrial recycling method for building residue soil with high sand and stone content

Technical Field

The invention relates to an industrial recycling method of building residue soil with high sand-stone content, in particular to a process and a method for separating and recycling the building residue soil with high sand-stone content, which is used for treating the building residue soil with high sand-stone content and is excavated in urban building construction such as high-rise foundation pit excavation, subway tunnel excavation and the like.

Background

At present, sand used in constructional engineering is basically collected from rivers, but excessive river (river) sand digging can lead the river (river) bed to integrally descend, so that bank slope collapse of a large bank can be easily caused in a flood season; during the dry period, the water level is easy to drop, which causes difficulty in irrigation along the line and water taking of domestic water. Therefore, the current situation that disordered river (river) sand excavation is forbidden gradually in China is great, so that the sand supply is short, the price is high, and the building cost is increased. On the other hand, clay brick firing is forbidden in China for protecting cultivated land, and the baking-free bricks currently used in the market are poorer in strength and durability than clay bricks, so that the construction quality needs to be ensured by improving the structural strength of a high-rise frame, and the construction cost is increased.

Meanwhile, in urban construction, the building muck excavated out of the foundation pit is abandoned in the field in the wasteland and is accumulated in the field, the mode occupies an area even to invade the farmland or forest land, is not beneficial to the growth of vegetation and even causes environmental damage, and further, the dust is increased after being sun for a long time, and the life and property safety is influenced if the building muck is rained for a long time.

Disclosure of Invention

The invention aims to provide a method for industrially recycling building muck with high sand content, which can effectively solve the problem of urban muck treatment and solve the problems of short sand supply and the like in the building construction process.

In order to solve the problems, the invention provides a method for industrially recycling building muck with high sand content, which comprises the following steps:

slurry making and water-soluble separation of the mud and sand: conveying large stones stacked in building slag soil of a slag soil yard to a stone crusher for crushing, conveying the rest materials to a stirring water-soluble treatment device through a feeding hopper, injecting water into the stirring water-soluble treatment device and stirring at a high speed to quickly dissolve the building slag soil in the water so as to form mud-sand slurry on the building slag soil, then conveying the mud-sand slurry to a drum screen device, separating the mud-sand slurry into mud and sand, allowing the mud to flow into a mud pool, and performing sand-stone separation and screening;

sand and stone separation and screening: conveying the sand and stone to a sand and stone screening roller, wherein the sand and stone screening roller comprises a feeding spiral blade segment, a sand and stone frying and washing segment, a round hole sieve plate segment and a discharging spiral blade segment, the sand and stone sequentially enters the feeding spiral blade segment, the sand and stone frying and washing segment, the round hole sieve plate segment and the discharging spiral blade segment, the sand and stone frying and washing segment further crushes the sand and stone mixture which meet the size specification and are repeatedly washed by high pressure water to form a sand and stone mixture, the round hole sieve plate segment screens the sand and stone mixture which meet the size specification into a mud stone launder, the sand and stone mixture which meet the size specification is conveyed to a stone crusher through the discharging spiral blade segment to be crushed and enters a stone crushing device, the stone crushing device firstly cleans up humus organic matters, plastics and the like through high pressure gas, then crushes the sand and stone mixture which meet the size specification and is conveyed to a rotary screen device to be sieved again, and the sand which meet the size specification and sand, Conveying the stone mixture to a stone vibration screening device through a stone lifting and washing device, cleaning the sand and stone mixture which meets the size specification by using water and draining the water in the lifting and washing process of the stone lifting and washing device, conveying the sand and stone mixture to the stone vibration screening device, screening the sand and stone mixture according to different particle sizes and respectively stacking the sand and stone mixture to different sand and stone yards, then washing and draining the remaining sand and sand through the sand lifting and washing device, conveying the sand and sand to the sand vibration screening device, screening the sand and sand according to different particle sizes by the sand vibration screening device and respectively stacking the sand and sand to different sand and stone yards, and completely collecting the remaining slurry water into a stone launder and performing a slurry treatment step;

slurry treatment: the mud in the mud pond is carried to mud sedimentation tank, sink earth and silt in the mud, make the top layer progressively form the clear water, and collect recycling through filtering, the earth and the silt of mud sedimentation tank bottom are carried to mud dewatering device, reduce the moisture content to below 35%, the water that wherein takes off mud is collected and is recycled, earth and silt after accomplishing the dehydration get into mixing arrangement, 13% -16% quality shale material is added simultaneously, form high performance mud material after accomplishing mixing, high performance mud material is carried to extrusion device, complete brickmaking, and stack to the pile up and dry the stock ground, thereby shine or air-dry naturally, the brick after accomplishing the airing is put into firing device, thereby accomplish the sintering and become building brick.

Further, the water-soluble treatment device in the mud-sand slurry making and water-soluble separation steps in the method for industrially recycling the building muck with high sand content comprises an outer cylinder, a wear-resistant inner cylinder, an extrusion grinding cone, a stirring shaft, a stirring arm and a discharge door; the outer barrel sleeve is arranged outside the wear-resistant inner barrel, the grinding cone is arranged on the inner side wall of the wear-resistant inner barrel, the stirring shaft is arranged in the middle of the wear-resistant inner barrel, the stirring arm is arranged on the stirring shaft, and the discharge door is arranged at the bottom of the wear-resistant inner barrel.

Furthermore, in the method for the industrial recycling of the building residue soil with high sand content, the rotary screen device is arranged at an inclination angle of 4-6 degrees, the diameter is 3.0-3.2m, the length is 8-10m, and the diameter of the screen hole is 12 mm. After the sand and stone material is lifted by the hook-shaped blades at the sand and stone frying and washing section, the sand and stone material can be downward scattered under the action of self weight and can be conveyed forwards, so that the sand and stone separation rate is improved on the principle of stone hitting.

Furthermore, in the method for the industrial reutilization of the building residue soil with high sand content, the sand screening roller is inclined by 5-8 degrees, the diameter is 2.2-2.5m, and the length is 14-16 m.

Further, in the method for industrially recycling the building residue soil with high sand and stone content, the bottom of the slurry water tank is made of a reinforced concrete structure, and the bottom is obliquely arranged towards one end.

Further, the mud sedimentation tank in the method for industrially recycling the building residue soil with high sand content comprises a plurality of small sedimentation tanks, and each small sedimentation tank comprises a mud injection port and a dewatering pump.

Further, in the method for industrially recycling the building residue soil with high sand content, the slurry dehydration device is a screw extrusion device.

The construction slag soil excavated in the construction site is treated on site, the sand, the stone and the soil are separated, the soil is respectively fired, and the sand and the stone are used as concrete raw materials for production.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present invention.

FIG. 2 is a schematic structural view of a stirring water-dissolving treatment device for slurry making according to the present invention.

FIG. 3 is a top view of the structure of the stirring water-soluble treatment device for slurry making of the present invention.

FIG. 4 is a schematic view of the structure of a drum screen for rapid separation of pulp and stone according to the present invention.

FIG. 5 is a schematic view of the structure of a sand screening drum for rapid sand and stone peeling separation according to the present invention.

FIG. 6 is a schematic view of the hook-shaped blade mounting structure of the water-soluble sand stir-frying section of the sand screening roller according to the present invention.

FIG. 7 is a schematic view of the mixture of the present invention sprayed down in a curtain-like fashion along the circular cross-section of the water-soluble saute section of the interior of the drum.

Reference numerals:

11: a muck yard; 12: a feeding hopper; 13: stirring and dissolving the water treatment device; 1301: an outer cylinder; 1302: a wear-resistant inner cylinder; 1303: extruding and grinding a cone; 1304: a stirring shaft; 1305: a stirring arm; 1306: a discharge door; 14: a trommel device; 1401: a feeding end annular baffle plate; 1402: a drum; 1403: an inner helical blade; 1404 mesh openings; 21: a mud stone launder; 22: a sand screening drum; 2201: feeding spiral blade segments; 2202: a sand stir-frying and washing section; 2203: a round-meshed deck section; 2204: discharging the spiral blade segments; 23: a stone crusher; 24: a stone lifting and washing device; 25: a stone vibration screening device; 26: a sandstone stock ground; 27: a sand material lifting and washing device; 28: a sand material vibrating screening device; 31: a slurry pool; 32: a mud sedimentation tank; 33: a slurry dewatering device; 34: a mixing device; 35: an extrusion device; 36: stacking and airing a stock ground; 37: and (4) a firing device.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

In the description of the present invention, it should be noted that the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Referring to fig. 1 to 7, the method for the industrial recycling of the construction waste soil with high sand content in the embodiment comprises the following steps:

slurry making and water-soluble separation of the mud and sand: the method comprises the steps of firstly removing oversized stones and wastes through an excavator, preliminarily crushing the oversized stones and wastes, conveying the oversized stones and wastes stacked in building muck in a muck yard 11 to a stone crusher 23 to crush, conveying the rest materials to a stirring water-soluble treatment device 13 through a feeding hopper 12, wherein the feeding hopper 12 comprises 4 sets of weighing and metering hoppers capable of metering the feeding quality, meanwhile, a reinforcing bar grid is arranged at the top of a feeding hole, the largest dimension is 200mm, so that the oversized stones are prevented from entering the hopper, the damage to subsequent production equipment is avoided, then, water is injected into the stirring water-soluble treatment device 13 and stirred at a high speed, the stirring water-soluble treatment device 13 is provided with 4 sets of stirring water-soluble treatment devices 13 in the embodiment and is arranged corresponding to the 4 sets of feeding hoppers 12, and the building muck is rapidly dissolved in the water through water injection, so that the building residue soil is formed into silt slurry, and each set of stirring water-soluble treatment device 13 comprises an outer cylinder 1301, a wear-resistant inner cylinder 1302, a grinding cone 1303, a stirring shaft 1304, a stirring arm 1305 and a discharge door 1306; the outer cylinder 1301 is sleeved outside the wear-resistant inner cylinder 1302The grinding cone 1303 is arranged on the inner side wall of the wear-resistant inner cylinder 1302, the stirring shaft 1304 is arranged in the middle of the wear-resistant inner cylinder 1302, the stirring shaft 1304 is provided with a stirring arm 1305, the bottom of the wear-resistant inner cylinder 1302 is provided with a discharge door 1306, sand and sand are washed by muddy water, the sand and the sand are crushed and separated by the mutual friction action of the grinding cone 1303 and the stirring shaft 1304, the muddy sand slurry flows out of the discharge door 1306, the batch processing capacity of each set of equipment is 4 tons, the processing speed is 1.5 min/batch, and 2.875m water is added into each batch³Then, the mud slurry liquid is conveyed to a rotary screen device 14, the rotary screen device 14 is arranged at an inclination angle of 4-6 degrees, the diameter is 3.0-3.2m, the length is 8-10m, and the diameter of a screen hole is 12 mm. The drum sieve device 14 is two sets of 2 sets of drum sieve devices with internal helical blades and sieve pores, the drum sieve device 14 separates the mud slurry liquid into mud and sand, the sand enters the subsequent process to be processed, and the drum sieve device 14 comprises: the feeding end annular baffle 1401, the roller 1402, the inner spiral blade 1403 and the sieve holes 1404, the mixture is pushed to the discharging hole along the roller 1402 through the inner spiral blade 1403, the silt slurry continuously leaks out of the sieve holes 1404, and the mud flows into the silt chute 21, so that the silt slurry and the gravel are quickly separated, and then the silt separation and the sieving are carried out.

Sand and stone separation and screening: the sand is conveyed to a sand screening roller 22, the sand screening roller 22 is arranged at an inclination of 5-8 degrees, the diameter is 2.2-2.5m, and the length is 14-16 m. The sand screening roller 22 comprises a feeding spiral blade segment 2201, a sand frying and washing segment 2202, a round hole screen plate segment 2203 and a discharging spiral blade segment 2204, sand sequentially enters the feeding spiral blade segment 2201, the sand frying and washing segment 2202, the round hole screen plate segment 2203 and the discharging spiral blade segment 2204, the sand frying and washing segment 2202 further crushes the sand and the stone and repeatedly washes the sand by high pressure water to form a sand and stone mixture, the round hole screen plate segment 2203 screens the sand and the stone mixture which meet the size specification into a mud stone launder 21, the sand and the stone mixture which meet the size specification are conveyed to a stone crusher 23 through the discharging spiral blade segment 2204 to be crushed, the stone crusher 23 cleans sundries such as humus organic matters and plastics through high pressure gas, then the sand and the stone mixture which meet the size specification are crushed by the crusher and conveyed to a rotary screen device 14 to be sieved again, and the sand and the stone mixture which meet the size specification are conveyed to a vibrating screening device 25 through a stone lifting and washing device 24, the stone material lifting and washing device 24 is generally a chain bucket type stone material lifting device, and in the lifting and washing process of the stone material lifting and washing device 24, after sand and stone mixture meeting the size specification is cleaned by water and drained, the sand and stone mixture is conveyed to a stone material vibration screening device 25, and is screened according to different particle sizes and is respectively stacked to different stone material yards 26, wherein the specific screening standard can be executed according to GB/T14685-2001 'size standard of pebbles and broken stones for buildings', and the specific particle sizes can be respectively 4.75mm-9.5mm, 9.5mm-16mm, 16mm-19mm, 19mm-26.5mm, 26.5mm-31.5mm, 31.5mm-37.5mm and 37.5mm-53 mm; then, the remaining sand materials are washed by water and drained through a sand material washing device 27 and are conveyed to a sand material vibration screening device 28, the sand material vibration screening device 28 screens the sand materials according to different particle sizes and respectively piles the sand materials to different sand material yards 26, the screening standard can be executed according to the GB/T14685-2001 dimension standard of construction pebbles and broken stones, and the particle sizes can be respectively 0.15mm-0.3mm, 0.3mm-0.6mm, 0.6mm-1.18mm, 1.18mm-2.36mm and 2.36mm-4.75 mm; the remaining slurry water is entirely collected into the slurry tank 31 and enters the slurry treatment step. The mud water overflow filter screen is arranged at the part of the mud stone chute 21, so that part of mud water can directly overflow to the mud water pool 31, the mud stone chute 21 is of a concrete structure, is connected with the outlet of the drum screen device 14 in front and is connected with the mud water pool in back, and the sand and mud mixture can flow from high to low in the front and back according to the production process flow.

Slurry treatment: the slurry in the slurry tank 31 is transported to the slurry sedimentation tank 32, wherein the bottom of the slurry tank 31 is made of reinforced concrete structure and is inclined towards one end, so that the soil dissolved in the water can be conveniently sedimentated to the lower end of the slurry tank, and the water containing less mud and sand is arranged at the higher end. The mud sedimentation tank 32 includes a plurality of small sedimentation tanks, each of which includes a mud injection port and a dewatering pump and can be operated independently. A lower cone is arranged above each small sedimentation tank, and a thick slurry pump is arranged at the bottom of each small sedimentation tank; the mud is conveyed to a mud dewatering device 33 for dewatering treatment, and can be filled into the mud dewatering device 33 for filtering and dewatering through a thick mud pump at multiple points, so as to form mud cakes, the extrusion filtered water is precipitated to form clear water, and after the clear water is filtered and collected, the clear water and the mud and silt in the mud are gradually formed by sinking the mud and the silt to the surface layer, and after the clear water and the mud are filtered and collected, the mud and the silt can be reused by a gravel screening roller 22, a stone material cleaning device 24 and a sand material cleaning device 27, the mud and the silt at the bottom layer of a mud sedimentation tank 32 are conveyed to the mud dewatering device 33, the mud dewatering device 33 is composed of a plurality of groups of screw extrusion devices, the water content can be reduced to below 35 percent after dewatering, the dewatered mud and the silt are collected and reused, the dewatered mud and the silt enter a mixing device 34, and shale materials with the mass of 13 to 16 percent are added simultaneously, and the high-performance mud is formed after mixing, high performance pug is carried to extrusion device 35, complete brickmaking to stack to pile up neatly and dry stock ground 36, thereby shine or air-dry naturally, and firing device 37 is put into to the brick after the completion dries, thereby accomplishes the sintering and becomes the brick for building. The sintering quality needs to meet the relevant standards of GB 5101-2003 'sintered common bricks' and GB13544-2011 'sintered porous bricks and porous building blocks'. When the water is insufficient in all water-requiring process links, the water can be supplemented by tap water.

This embodiment makes thick liquid through carrying out the silt particle in with building dregs, and the silt particle dissolves in water with higher speed, passes through the second grade separation mode after that, improves the separation efficiency of mud, sand, stone, but whole set of process flow continuity production need not to wait for the production of certain link in the middle.

It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.

Claims

1. The method for industrially recycling the building residue soil with high sand-containing rate is characterized by comprising the following steps:

slurry making and water-soluble separation of the mud and sand: conveying large stones with the particle size larger than or equal to 50mm in building slag stacked in a slag soil yard (11) to a stone crusher (23) for crushing, conveying the rest materials to a stirring water-soluble treatment device (13) through a feeding hopper (12), injecting water into the stirring water-soluble treatment device (13) and stirring at a high speed to enable the building slag to be rapidly dissolved in the water so as to enable the building slag to form mud-sand slurry, then conveying the mud-sand slurry to a rotary screen device (14), separating the mud-sand slurry into mud and sand by the rotary screen device (14), enabling the mud to flow into a mud-stone launder (21), and entering a sand-stone separation and screening step;

sand and stone separation and screening: the sand and stone are conveyed to a sand and stone screening roller (22), the sand and stone screening roller (22) comprises a feeding spiral blade segment (2201), a sand and stone frying and washing segment (2202), a round hole sieve plate segment (2203) and a discharging spiral blade segment (2204), the sand and stone sequentially enter the feeding spiral blade segment (2201), the sand and stone frying and washing segment (2202), the round hole sieve plate segment (2203) and the discharging spiral blade segment (2204), the sand and stone are further crushed by the sand and stone frying and washing segment (2202) and are repeatedly washed by high-pressure water to form a sand and stone mixture, the round hole sieve plate segment (2203) screens the sand and stone mixture with the size smaller than 50mm into a mud and stone chute (21), the sand and stone mixture with the size larger than 50mm are conveyed to the stone crusher (23) through the discharging spiral blade segment (2204) to be crushed, and the crusher (23) firstly conveys humus organic matters and organic matters through high-pressure gas, Cleaning up sundries such as plastics, crushing the sand and stone mixture with the over-size specification, conveying the sand and stone mixture to the rotary screen device (14) for separation and screening again, conveying the sand and stone mixture with the over-size specification to the stone vibration screening device (25) through the stone lifting and washing device (24), cleaning the sand and stone mixture with the over-size specification by using water and draining the water in the lifting and washing process of the stone lifting and washing device (24), conveying the sand and stone mixture with the over-size specification to the stone vibration screening device (25), screening the sand and stone mixture according to different particle sizes and respectively stacking the sand and stone mixture to different sand and stone material yards (26), washing and draining the remaining sand and stone material through the sand lifting and washing device (27), conveying the sand and stone vibration screening device (28), screening the sand and sand material respectively stacking the sand and sand to different sand and stone material yards (26) through the sand and material lifting and washing device (27), the residual slurry water is completely gathered into a slurry water tank (31) and enters a slurry treatment step;

slurry treatment: the mud in the mud pool (31) is conveyed to a mud sedimentation tank (32) to sink the mud and silt in the mud so that clear water is gradually formed on the surface layer, and is filtered, collected and reused, the mud and the silt on the bottom layer of the mud sedimentation tank (32) are conveyed to a mud dewatering device (33) to reduce the water content to below 35 percent, wherein the dewatered mud is collected and reused, the dewatered mud and the silt enter a mixing device (34), meanwhile, 13 to 16 mass percent of shale material is added, and high-performance pug is formed after the completion of mixing, the high-performance pug is conveyed to an extrusion device (35) for complete brick making and is stacked to a stacking and airing storage yard (36), thereby naturally drying or airing, and putting the dried brick into a firing device (37) to finish sintering so as to obtain the building brick;

the water-soluble treatment device (13) in the steps of mud-sand slurrying and water-soluble separation comprises an outer cylinder (1301), a wear-resistant inner cylinder (1302), an extruding and grinding cone (1303), a stirring shaft (1304), a stirring arm (1305) and a discharge door (1306);

the outer cylinder (1301) is sleeved outside the wear-resistant inner cylinder (1302), the extruding and grinding cone (1303) is arranged on the inner side wall of the wear-resistant inner cylinder (1302), the stirring shaft (1304) is arranged in the middle of the wear-resistant inner cylinder (1302), the stirring arm (1305) is arranged on the stirring shaft (1304), and the discharge door (1306) is arranged at the bottom of the wear-resistant inner cylinder (1302).

2. The method for industrially recycling the building residue soil with high sand content according to claim 1, which is characterized in that:

the diameter of the drum screen device (14) is 3.0-3.2m, the length of the drum screen device is 8-10m, the diameter of a screen hole is 12mm, the drum screen device is arranged at an inclination angle of 4-6 degrees, an inlet is low, an outlet is high, the conveying resistance of silt slurry is increased, the friction force among silt materials is increased, and the silt separation rate is improved.

3. The method for industrially recycling the building residue soil with high sand content according to claim 2, which is characterized in that:

the diameter of the sand screening roller (22) is 2.2-2.5m, the length is 14-16m, and the inclination is 5-8 degrees.

4. The method for industrially recycling the building residue soil with high sand content according to claim 3, which is characterized in that:

the bottom of the slurry pool (31) is made of a reinforced concrete structure, and the bottom is obliquely arranged towards one end.

5. The method for industrially recycling the building residue soil with high sand content according to claim 3, which is characterized in that:

the mud sedimentation tank (32) comprises a plurality of small sedimentation tanks, and each small sedimentation tank comprises a mud injection port and a dewatering pump.

6. The method for industrially recycling the building residue soil with high sand content according to claim 3, which is characterized in that:

the slurry dehydration device (33) is a screw extrusion device.