A cemented soil and preparation process

Abstract

The present invention relates to the technical field of building materials, and in particular to a cementing soil and a preparation process. The cementing soil raw materials include 1500-1800 parts of dry soil, 60-80 parts of cement, 300-350 parts of water, and 60-80 parts of phosphogypsum by weight. The preparation process includes fully stirring and mixing the raw materials, laying, compacting, and curing the mixture to obtain the cementing soil. It can utilize phosphogypsum, reduce the amount of cement, and consume phosphogypsum, greatly improving environmental friendliness. It is simple and quick, can effectively improve the uniformity of the cementing soil, effectively reduce the probability of local uneven distribution of components, and ensure the uniformity of the texture and performance of the cementing soil.

Description

Technical Field

[0001] The invention relates to the technical field of building materials, and in particular to a cemented soil and a preparation process thereof. Background Art

[0002] Phosphogypsum is an industrial byproduct of phosphoric acid produced by wet process in phosphorus chemical enterprises. The output is very large. The storage of large amounts of phosphogypsum not only occupies land resources, but also causes serious environmental pollution. Traditional cementing soil cannot utilize phosphogypsum, and is highly dependent on cement, with a large amount of cement used, so its environmental friendliness needs to be improved.

[0003] In view of this, this application is hereby filed. Summary of the invention

[0004] The first object of the present invention is to provide a cementing soil which can utilize phosphogypsum, thereby reducing the amount of cement and consuming phosphogypsum, thereby greatly improving environmental friendliness.

[0005] The second object of the present invention is to provide a cemented soil preparation process, which is simple and quick, can effectively improve the uniformity of the cemented soil, effectively reduce the probability of local uneven distribution of components, and ensure the uniformity of the texture and performance of the cemented soil.

[0006] The embodiment of the present invention is achieved as follows:

[0007] A cementing soil, the raw materials of which include, by weight, 1500-1800 parts of dry soil, 60-80 parts of cement, 300-350 parts of water, and 60-80 parts of cementitious materials. The cementitious materials include: phosphogypsum.

[0008] Furthermore, the raw materials include, by weight: 1580 parts of dry soil, 63 parts of cement, 316 parts of water, and 63.2 parts of cementitious materials. The cementitious materials include: dihydrate phosphogypsum.

[0009] A cemented soil preparation process, comprising:

[0010] 1500-1800 parts of dry soil, 60-80 parts of cement, 300-350 parts of water and 60-80 parts of cementitious material are fully stirred and mixed by weight; the cementitious material includes phosphogypsum;

[0011] After the mixture is laid, compacted and cured, cemented soil is obtained.

[0012] Further, 1580 parts of dry soil, 63 parts of cement, 316 parts of water and 63.2 parts of cementitious materials in parts by weight were fully stirred and mixed.

[0013] Further, the dry soil, cement, water and cementitious material are fully stirred and mixed by a mixing device.

[0014] The mixing device comprises: a mixing tank, a stirring main shaft, a cover body and an auxiliary stirring shaft. The stirring main shaft is installed in the mixing chamber of the mixing tank, the stirring main shaft is arranged along the height direction of the mixing tank, and the stirring main shaft is arranged in the middle of the mixing tank.

[0015] The top of the mixing tank is provided with an opening, a cover body is detachably covered on the opening of the mixing tank, an auxiliary stirring shaft is arranged on the inner side of the cover body and extends toward the bottom of the mixing tank. Along the circumference of the mixing tank, a plurality of auxiliary stirring shafts are arranged around the stirring main shaft.

[0016] Furthermore, the mixing device also includes: a positioning column, a supporting plate, a rotating sleeve, a positioning sleeve and a sliding rod.

[0017] The positioning post is fixedly connected to the cover body and extends toward the mixing tank, and the supporting plate is arranged perpendicular to the positioning post and fixedly connected to the positioning post.

[0018] The rotating sleeve is rotatably sleeved on the positioning column. The positioning sleeve and the rotating sleeve are arranged in parallel and at intervals. The positioning sleeve and the rotating sleeve are fixedly connected by a connecting rod.

[0019] The slide bar can be slidably matched in the positioning sleeve, the bottom end of the slide bar is fixedly connected to the auxiliary stirring shaft, the top end of the slide bar is fixedly connected with a stop block, and an elastic member is abutted between the positioning sleeve and the auxiliary stirring shaft.

[0020] The upper plate surface of the support plate is provided with a moving track, which continuously extends in a ring shape along the circumference of the positioning column. Along the circumference of the moving track, the track surface of the moving track is provided with raised parts and recessed parts which are alternately arranged in sequence.

[0021] The outer side wall of the auxiliary stirring shaft is provided with a roller, and the roller cooperates with the track surface of the moving track, so that the roller can alternately lift and lower the auxiliary stirring shaft during the movement along the moving track.

[0022] Furthermore, the auxiliary stirring shaft includes: an outer shaft sleeve, a shaft core body, a connecting pipe and an end cover.

[0023] The shaft core body can be slidably matched in the outer sleeve, and the shaft core body is a hollow structure. The end cover is arranged at the top of the outer sleeve and is fixedly connected to the outer sleeve, and a hollow structure is formed between the end cover and the end of the outer sleeve. A cylinder assembly is fixedly installed on the inner side of the end cover, and the cylinder assembly is drivingly connected to the shaft core body.

[0024] The side wall of the outer sleeve is provided with a first through hole, and the side wall of the shaft core is provided with a second through hole. The shaft core has a first movement stop point and a second movement stop point. When the shaft core is located at the first movement stop point, the first through hole and the second through hole are aligned and connected. When the shaft core is located at the second movement stop point, the first through hole and the second through hole are staggered, and the first through hole is closed by the side wall of the shaft core.

[0025] The connecting pipe is fixedly connected to the shaft core body and communicated with the shaft core body, and the outer end of the connecting pipe is communicated with the blowing component.

[0026] Furthermore, the mixing device further comprises: a screw conveying mechanism. The screw conveying mechanism is used to convey cement and / or cementitious material, and the outlet end of the screw conveying mechanism is connected to the connecting pipe.

[0027] Furthermore, the mixing device further comprises: a water supply component. The water supply component is communicated with the connecting pipe.

[0028] Furthermore, when the dry soil, cement, water and cementitious material are stirred and mixed by the mixing device, the method includes:

[0029] First add the dry soil into the mixing tank and start stirring;

[0030] Using the air supply assembly to supply air to the connecting pipe, and controlling the shaft core body to move to the first movement stop point;

[0031] Using a screw conveying mechanism to uniformly convey cement and / or cementitious materials into the connecting pipe;

[0032] After the cement and the cementitious material have been added, water is supplied to the connecting pipe using the water supply assembly.

[0033] The beneficial effects of the technical solution of the embodiment of the present invention include:

[0034] The 28d compressive strength of the cemented soil provided by the embodiment of the present invention can reach 0.9MPa, and the 90d compressive strength can reach 1.2MPa. Under the premise of ensuring the strength, the cemented soil uses phosphite, which correspondingly reduces the amount of cement used and is more environmentally friendly.

[0035] The cementing soil preparation process provided by the embodiment of the present invention greatly improves the uniformity of adding cement and cementitious materials, and also improves the distribution uniformity of cement and cementitious materials in dry soil when they are added, so that cement and cementitious materials can be mixed faster and more fully.

[0036] In general, the cementing soil provided by the embodiment of the present invention can utilize phosphogypsum, reduce the amount of cement used, and consume phosphogypsum, thereby greatly improving environmental friendliness. The cementing soil preparation process provided by the embodiment of the present invention is simple and fast, can effectively improve the uniformity of the cementing soil, effectively reduce the probability of uneven local distribution of components, and ensure the uniformity of the texture and performance of the cementing soil. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 A schematic diagram of the overall structure of a mixing device used in a cemented soil preparation process provided in an embodiment of the present invention;

[0039] Figure 2 A schematic diagram of the assembly of an auxiliary stirring shaft of a mixing device used in a cemented soil preparation process provided in an embodiment of the present invention;

[0040] Figure 3 It is a structural schematic diagram of the auxiliary stirring shaft;

[0041] Figure 4 It is a structural schematic diagram when the auxiliary stirring shaft is at the first movement dead point;

[0042] Figure 5 It is a schematic diagram of the matching relationship between the first through hole and the second through hole when the auxiliary stirring shaft is at the first movement dead point;

[0043] Figure 6 It is a structural schematic diagram when the auxiliary stirring shaft is at the second movement dead point.

[0044] Description of reference numerals:

[0045] Mixing device 1000; mixing tank 100; stirring main shaft 110; cover body 200; positioning column 210; support plate 220; rotating sleeve 230; positioning sleeve 240; connecting rod 241; sliding rod 250; stop block 251; elastic member 252; moving track 260; protrusion 261; recessed portion 262; second driver 270; auxiliary stirring shaft 300; outer sleeve 310; first through hole 311; shaft core body 320; second through hole 321; connecting pipe 330; end cover 340; clearance hole 341; roller 350; cylinder assembly 360. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0047] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0049] The terms “first”, “second”, “third”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0050] In addition, the terms "parallel", "vertical", etc. do not mean that the components must be absolutely parallel or vertical, but can be slightly tilted. For example, "parallel" only means that its direction is more parallel than "vertical", and does not mean that the structure must be completely parallel, but can be slightly tilted.

[0051] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] Please refer to Figure 1 The present embodiment provides a cementing soil, wherein the raw materials of the cementing soil include, by weight: 1500-1800 parts of dry soil, 60-80 parts of cement, 300-350 parts of water, and 60-80 parts of cementitious material. The cementitious material may be phosphogypsum.

[0053] Optionally, the raw materials of the cementing soil include, by weight: 1580 parts of dry soil, 63 parts of cement, 316 parts of water, and 63.2 parts of cementitious material. The cementitious material may be dihydrate phosphogypsum.

[0054] The 28d compressive strength of cemented soil can reach 0.9MPa, and the 90d compressive strength can reach 1.2MPa. While ensuring the strength of cemented soil, phosphite is used, which reduces the amount of cement and is more environmentally friendly.

[0055] In general, cementing soil can make use of phosphogypsum, which reduces the amount of cement while consuming phosphogypsum, greatly improving environmental friendliness.

[0056] The present embodiment also provides a cemented soil preparation process, which includes: fully stirring and mixing the various components of the above-mentioned raw materials in parts by weight; and obtaining cemented soil after laying, compacting and curing the mixture.

[0057] In order to improve the mixing effect, a mixing device 1000 may be used to fully stir and mix.

[0058] Specifically, the mixing device 1000 includes: a mixing tank 100 , a stirring main shaft 110 , a cover body 200 and an auxiliary stirring shaft 300 .

[0059] The stirring shaft 110 is installed in the mixing chamber of the mixing tank 100 . The stirring shaft 110 is arranged along the height direction of the mixing tank 100 . The stirring shaft 110 is arranged in the middle of the mixing tank 100 . The stirring shaft 110 is driven by a first driver (not shown in the figure).

[0060] The top of the mixing tank 100 is provided with an opening, and the cover 200 is detachably provided on the opening of the mixing tank 100. The auxiliary stirring shaft 300 is provided on the inner side of the cover 200 and extends toward the bottom of the mixing tank 100. The auxiliary stirring shaft 300 is provided parallel to the stirring main shaft 110. Along the circumference of the mixing tank 100, a plurality of auxiliary stirring shafts 300 are provided around the stirring main shaft 110.

[0061] Furthermore, the mixing device 1000 further includes: a positioning column 210 , a supporting plate 220 , a rotating sleeve 230 , a positioning sleeve 240 and a sliding rod 250 .

[0062] The positioning post 210 is fixedly connected to the cover 200 and extends toward the mixing tank 100. The positioning post 210 is coaxially arranged with the stirring main shaft 110, and there is a gap between the bottom end of the positioning post 210 and the top end of the stirring main shaft 110. The support plate 220 is arranged perpendicular to the positioning post 210 and fixedly connected to the positioning post 210. The positioning post 210 is connected to the middle of the support plate 220.

[0063] The rotating sleeve 230 is rotatably sleeved on the positioning column 210. Along the axial direction of the positioning column 210, the rotating sleeve 230 is fixedly matched with the positioning column 210. The cover body 200 is also equipped with a second driver 270. The second driver 270 is transmission-matched with the rotating sleeve 230. The positioning sleeve 240 is parallel to the rotating sleeve 230 and is arranged at intervals. The positioning sleeve 240 and the rotating sleeve 230 are fixedly connected by a connecting rod 241. The connecting rod 241 is arranged along the radial direction of the positioning column 210. There are multiple connecting rods 241 and positioning sleeves 240. One connecting rod 241 is connected to one positioning sleeve 240. The connecting rods 241 and the positioning sleeves 240 are evenly spaced along the circumference of the rotating sleeve 230.

[0064] The slide rod 250 can be slidably engaged in the positioning sleeve 240, the bottom end of the slide rod 250 is fixedly connected to the auxiliary stirring shaft 300, the top end of the slide rod 250 is fixedly connected with a stop block 251, and an elastic member 252 is abutted between the positioning sleeve 240 and the auxiliary stirring shaft 300. The elastic member 252 is a columnar spring, and the elastic member 252 is sleeved on the slide rod 250.

[0065] The upper plate surface of the support plate 220 is provided with a moving track 260, and the moving track 260 continuously extends into a ring shape along the circumference of the positioning column 210. Along the circumference of the moving track 260, the track surface of the moving track 260 is provided with protrusions 261 and recesses 262 arranged alternately in sequence.

[0066] The outer side wall of the auxiliary stirring shaft 300 is provided with a roller 350 , which cooperates with the track surface of the moving track 260 , so that the roller 350 can alternately lift and lower the auxiliary stirring shaft 300 during the movement along the moving track 260 .

[0067] The auxiliary stirring shaft 300 includes an outer shaft sleeve 310 , a shaft core body 320 , a connecting pipe 330 and an end cover 340 .

[0068] The shaft core 320 is slidably fitted in the outer sleeve 310. The lower end of the outer sleeve 310 is a closed structure, and the lower end of the outer sleeve 310 is a conical structure. The shaft core 320 is a hollow structure. The end cover 340 is covered at the top of the outer sleeve 310 and is fixedly connected to the outer sleeve 310. The end of the end cover 340 and the end of the outer sleeve 310 form a hollow structure. The inner side of the end cover 340 is fixedly installed with a cylinder assembly 360, and the cylinder assembly 360 is drivingly connected to the shaft core 320.

[0069] The side wall of the outer sleeve 310 is provided with a first through hole 311, and the side wall of the shaft core body 320 is provided with a second through hole 321. The shaft core body 320 has a first movement stop point and a second movement stop point. When the shaft core body 320 is located at the first movement stop point, the first through hole 311 and the second through hole 321 are aligned and connected. When the shaft core body 320 is located at the second movement stop point, the first through hole 311 and the second through hole 321 are staggered, and the first through hole 311 is closed by the side wall of the shaft core body 320.

[0070] The cylinder assembly 360 can drive the shaft core body 320 to move axially, so that the shaft core body 320 switches between a first movement stop point and a second movement stop point.

[0071] The roller 350 is mounted on the outer wall of the outer sleeve 310 , the sliding rod 250 is fixedly connected to the top of the end cover 340 , and the elastic member 252 abuts between the end cover 340 and the positioning sleeve 240 .

[0072] The connecting tube 330 is fixedly connected to the shaft core body 320 and communicates with the shaft core body 320. The outer end of the connecting tube 330 is communicated with a blowing assembly (not shown in the figure). The side wall of the end cover 340 is provided with a clearance hole 341 for the connecting tube 330 to extend out. The clearance hole 341 extends along the axial direction of the auxiliary stirring shaft 300 so that when the shaft core body 320 moves between the first movement stop point and the second movement stop point, the connecting tube 330 can move within the range of the clearance hole 341.

[0073] The mixing device 1000 further includes: a screw conveying mechanism (not shown in the figure). The screw conveying mechanism is used to convey cement and / or cementitious materials, and the outlet end of the screw conveying mechanism is connected to the connecting pipe 330. The mixing device 1000 further includes: a water supply component (not shown in the figure). The water supply component is connected to the connecting pipe 330.

[0074] It should be noted that cement and cementitious material can be added one by one through the connecting pipe 330 , or can be added simultaneously through the connecting pipes 330 of different auxiliary stirring shafts 300 .

[0075] When the mixing device 1000 is used to mix dry soil, cement, water and cementitious materials, the process includes: firstly adding dry soil into the mixing tank 100, starting to mix the dry soil by using the mixing main shaft 110, and driving the rotating sleeve 230 by using the second driver 270. Using the air supply assembly to supply air to the connecting pipe 330, and using the cylinder assembly 360 to control the shaft core body 320 to move to the first movement dead point, at which time the air flow can enter the mixing tank 100 through the second through hole 321 and the first through hole 311.

[0076] Subsequently, the screw conveying mechanism can be used to uniformly convey the powder of cement and / or cementitious material into the connecting pipe 330 . The powder is blown away by the airflow and conveyed by the airflow into the mixing tank 100 to be mixed with the dry soil.

[0077] When the second driver 270 drives the rotating sleeve 230, the auxiliary stirring shaft 300 rotates along the circumference of the stirring main shaft 110, and the roller 350 also moves along the motion track 260. When the roller 350 moves on the motion track 260, the roller 350 passes through the protrusion 261 and the recessed portion 262 alternately, and the auxiliary stirring shaft 300 can be displaced along its axial direction, thereby changing the height of the first through hole 311. That is to say, the auxiliary stirring shaft 300 moves up and down while performing circumferential movement, which greatly improves the uniformity of adding cement and cementitious materials, and also improves the distribution uniformity of cement and cementitious materials in dry soil when they are added, so that cement and cementitious materials can be mixed faster and more fully.

[0078] After the cement and the cementitious material are added, water is supplied to the connecting pipe 330 by using the water supply assembly for final mixing and stirring.

[0079] After adding water, the air supply assembly can be used to continue to supply air. On the one hand, the residual water in the channel can be fully blown out to dry the channel and avoid interference with the addition of the next processed powder. On the other hand, gas can be blown into the mixed phase. Under the stirring effect, it is more conducive to fully disturbing the mixed phase and further improving the mixing effect. Stop the air supply after a period of time, and then stir for a period of time to eliminate the bubbles.

[0080] It should be noted that during the water adding process, the air supply is not interrupted, and the connection part between the water supply component and the connecting pipe 330 is located downstream of the connection part between the spiral conveying mechanism and the connecting pipe 330, and the connection part between the air supply component and the connecting pipe 330 is located upstream of the connection part between the spiral conveying mechanism and the connecting pipe 330.

[0081] Furthermore, the position of the first through hole 311 is configured such that, under the driving action of the second driver 270, in the circumferential direction of the mixing tank 100, the first through hole 311 is opened on the side of the outer sleeve 310 away from the traveling direction of the auxiliary stirring shaft 300, and is opened on the back of the auxiliary stirring shaft 300 in the traveling direction. In this way, when the auxiliary stirring shaft 300 is stirring the mixed phase, it is easier to form a cavity behind the auxiliary stirring shaft 300, thereby reducing the resistance of the airflow entering the mixed phase.

[0082] In summary, the cementing soil provided by the embodiment of the present invention can utilize phosphogypsum, reduce the amount of cement used, and consume phosphogypsum, greatly improving environmental friendliness. The cementing soil preparation process provided by the embodiment of the present invention is simple and fast, can effectively improve the uniformity of the cementing soil, effectively reduce the probability of uneven local distribution of components, and ensure the uniformity of the texture and performance of the cementing soil.

[0083] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A process for preparing cemented soil, characterized in that: include: 1500-1800 parts by weight of dry soil, 60-80 parts of cement, 300-350 parts of water and 60-80 parts of phosphogypsum are fully stirred and mixed; after the mixture is laid, compacted and cured, cemented soil is obtained; wherein the dry soil, the cement, the water and the phosphogypsum are fully stirred and mixed by a mixing device; The mixing device comprises: a mixing tank, a stirring main shaft, a cover body and an auxiliary stirring shaft; the stirring main shaft is installed in the mixing chamber of the mixing tank, the stirring main shaft is arranged along the height direction of the mixing tank, and the stirring main shaft is arranged in the middle of the mixing tank; The top of the mixing tank is provided with an opening, the cover body is detachably covered on the opening of the mixing tank, the auxiliary stirring shaft is arranged on the inner side of the cover body and extends toward the bottom of the mixing tank; along the circumference of the mixing tank, a plurality of the auxiliary stirring shafts are arranged around the stirring main shaft; The mixing device also includes: a positioning column, a supporting plate, a rotating sleeve, a positioning sleeve and a sliding rod; The positioning post is fixedly connected to the cover body and extends toward the mixing tank, and the support plate is arranged perpendicular to the positioning post and fixedly connected to the positioning post; The rotating sleeve is rotatably sleeved on the positioning column, the positioning sleeve is parallel to and spaced from the rotating sleeve, and the positioning sleeve and the rotating sleeve are fixedly connected by a connecting rod; The slide bar is slidably fitted in the positioning sleeve, the bottom end of the slide bar is fixedly connected to the auxiliary stirring shaft, the top end of the slide bar is fixedly connected to a stop block, and an elastic member is abutted between the positioning sleeve and the auxiliary stirring shaft; The upper plate surface of the support plate is provided with a moving track, and the moving track continuously extends into a ring shape along the circumference of the positioning column; along the circumference of the moving track, the track surface of the moving track is provided with raised parts and recessed parts arranged alternately in sequence; The outer side wall of the auxiliary stirring shaft is provided with a roller, and the roller cooperates with the track surface of the moving track, so that the roller can alternately lift and lower the auxiliary stirring shaft during the movement along the moving track.

2. The process for preparing cemented soil according to claim 1, characterized in that: 1580 parts of dry soil, 63 parts of cement, 316 parts of water and 63.2 parts of phosphogypsum by weight were fully stirred and mixed.

3. The process for preparing cemented soil according to claim 1, characterized in that: The auxiliary stirring shaft comprises: an outer shaft sleeve, a shaft core body, a connecting pipe and an end cover; The shaft core body can be slidably matched in the outer sleeve, and the shaft core body is a hollow structure; the end cover is arranged on the top of the outer sleeve and is fixedly connected to the outer sleeve, and a hollow structure is formed between the end cover and the end of the outer sleeve; a cylinder assembly is fixedly installed on the inner side of the end cover, and the cylinder assembly is drivingly connected to the shaft core body; The side wall of the outer sleeve is provided with a first through hole, and the side wall of the shaft core is provided with a second through hole; the shaft core has a first movement stop point and a second movement stop point; when the shaft core is located at the first movement stop point, the first through hole and the second through hole are aligned and connected; when the shaft core is located at the second movement stop point, the first through hole and the second through hole are staggered, and the first through hole is closed by the side wall of the shaft core; The connecting pipe is fixedly connected to the shaft core body and communicates with the shaft core body, and the outer end of the connecting pipe is communicated with the blowing assembly.

4. The process for preparing cemented soil according to claim 3, characterized in that: The mixing device further comprises: a screw conveying mechanism; the screw conveying mechanism is used to convey the cement and the phosphogypsum, and the outlet end of the screw conveying mechanism is connected to the connecting pipe.

5. The process for preparing cemented soil according to claim 4, characterized in that: The mixing device further comprises: a water supply component; the water supply component is communicated with the connecting pipe.

6. The process for preparing cemented soil according to claim 5, characterized in that: When the dry soil, the cement, the water and the phosphogypsum are stirred and mixed by the mixing device, the method comprises: First, add the dry soil into the mixing tank and start stirring; Using the air blowing assembly to deliver air into the connecting pipe, and controlling the shaft core to move to the first movement stop point; Using the screw conveying mechanism to uniformly convey the cement and the phosphogypsum into the connecting pipe; After the cement and the phosphogypsum are added, the water supply assembly is used to supply water to the connecting pipe.

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