CN116003037A - Solid waste base high-water-content soft soil curing agent and curing device - Google Patents

Abstract

The invention discloses a solid waste base high-water-content soft soil curing agent and a curing device. The raw materials of the curing agent comprise building solid waste, industrial solid waste, biomass solid waste, alkali-activated materials, cement, fiber materials and high polymer materials. The curing device comprises an automatic opening and closing device, a soft soil feed hopper, a stirring device, a pressing die device, a storage bin, a power device positioned at the bottom and a PLC. The curing agent provided by the invention can partially replace cement, is environment-friendly and pollution-free, is favorable for ecological protection, is provided with a high-water-content sludge curing treatment system, is controlled by a PLC (programmable logic controller), is provided with a stirring device for stirring, is formed by pressing by a die device, randomly extracts samples for strength detection and crack detection in the process, can be packaged and then is discharged, and the whole equipment can be moved by utilizing power so as to cope with complex site environments.

Description

A solid waste-based high-water content soft soil curing agent and curing device

Technical Field

The invention relates to a solid waste-based high-water content soft soil curing agent and a curing device, belonging to the technical field of sludge curing treatment.

Background Art

There are a lot of high-water content silty soils in my country's coastal areas, including natural sedimentary soft soil and artificial blown fill soil, which need to be reinforced before they can be used for engineering construction. At present, cement is the material selected for silt solidification at home and abroad. The production of cement will emit a large amount of carbon dioxide, so it is necessary to develop a cementitious material that can partially replace cement. my country's infrastructure is developing rapidly, consuming a large amount of building materials and raw materials, and also generating large amounts of solid waste such as construction solid waste, industrial solid waste and derived biomass solid waste. Construction waste, thrown directly into the landfill, takes up a lot of space, but after grinding the construction waste, it will produce gelling properties, which can slow down the water contained in it, making the whole system very regular, and making it separate piece by piece, with better operability. Industrial solid waste has potential activity, and there are greater advantages in using it as a curing agent. Biomass solid waste has a large amount of volcanic ash components, which has many advantages when used as a soil curing agent. At the same time, fiber materials can effectively enhance the mechanical properties of the solidified soil. Polymer materials improve the mechanical properties of the overall material. Use their properties and these solid wastes for reuse to produce curing agents. The existing curing agent treatment system requires manual measurement of the components in the sludge and further judgment of the amount of curing agent to be used. The process is cumbersome and complicated. Therefore, it is necessary to develop a solid waste-based high-moisture content soft soil curing agent and its treatment system.

Summary of the invention

The technical problem to be solved by the present invention is to provide a solid waste-based high-water content soft soil curing agent and a curing device.

In order to solve the above technical problems, the present invention provides a solid waste-based high-water content soft soil solidifier, whose raw materials include construction solid waste, industrial solid waste, biomass solid waste, alkali-activated materials, cement, fiber materials and polymer materials.

Preferably, the construction solid waste is at least one of red brick powder and waste concrete recycled micropowder; the industrial solid waste is at least one of mineral powder, steel slag powder and carbide slag powder; the biomass solid waste is at least one of rice husk ash; and the alkali-activated material is quicklime, sodium hydroxide and magnesium hydroxide.

Preferably, the relationship between the moisture content of the solid waste-based high-moisture content soft soil and the mass proportion of construction solid waste, industrial solid waste, and biomass solid waste is shown in Table 1:

Table 1

The mass content of organic matter in the solid waste-based high-water content soft soil, the mass concentration of salt and the mass ratio of raw materials are shown in Table 2:

Table 2

Organic matter content Salt concentration Quality Ratio ≤5% ≤2% 10:40:30:8:7:4:1 ≤5% >2% and <8% 10:40:30:9:6:4:1 ≤5% ≥ 8% 10:40:30:10:5:4:1 >5% and <12% ≤2% 15:40:25:8:7:4:1 >5% and <12% >2% and <8% 15:40:25:9:6:4:1 >5% and <12% ≥ 8% 15:40:25:10:5:4:1 ≥12% ≤2% 20:40:20:8:7:4:1 ≥12% >2% and <8% 20:40:20:9:6:4:1 ≥12% ≥ 8% 20:40:20:10:5:4:1

;

In Table 2, the mass ratios are construction solid waste, industrial solid waste, biomass solid waste, alkali-activated materials, cement, fiber materials, and polymer materials;

The relationship between the required curing strength of the solid waste-based high-water content soft soil and the specifications of some raw materials is shown in Table 3:

Table 3

Intensity range Construction solid waste Industrial solid waste Biomass solid waste ≤1MPa 270-550μm 150-270μm 106-380μm ＞1 and ＜2MPa 25-250μm 74-115μm 48-96μm ≥2MPa 6.5-23μm 18-58μm 10-45μm

;

The relationship between the environmental protection requirements of the solid waste-based high-water content soft soil and the mass percentage of some raw materials is shown in Table 4:

Table 4

Environmental requirements Alkali-activated materials cement Low carbon and environmental protection requirements ≤5% 0% No low-carbon environmental protection requirements ≤10% ≤7%

;

When the solid waste-based high-water content soft soil is used for the solid waste leaching toxicity test, the relationship between the concentration control range of heavy metals and their mass percentage in the solidified soil is shown in Table 5:

Table 5

Heavy metal concentration control range Mass percentage of heavy metals ≤0.005mg/L 9% ＞0.005mg/L and ＜0.01mg/L 7% ≥0.01mg/L 2%

;

The relationship between the crack control range after solidification of the solid waste-based high-water content soft soil and the mass percentage of the fiber material is shown in Table 6:

Table 6

Crack control range Mass percentage of fiber material Minor cracks ≥ 4% General cracks ≤4%

.

The present invention also provides a solid waste-based high-water content soft soil solidification device, which comprises:

Automatic opening and closing devices;

A soft soil feed hopper and seven feed hoppers for feeding seven kinds of raw materials of the above-mentioned solid waste-based high-water content soft soil curing agent, and a flow valve is provided under the soft soil feed hopper and each feed hopper;

A stirring device, wherein the stirring device is provided with a stirring chamber, the stirring chamber is provided with 8 stirring chamber inlets connected with 8 flow valves, and a stirring device outlet is provided at a downstream of the stirring device along a material moving direction;

A die pressing device, wherein the die pressing device is provided with a die pressing device inlet, and the die pressing device inlet is connected to the stirring device outlet;

A storage bin, wherein the storage bin inlet on one side of the storage bin is connected to the die pressing device; and a discharge port 1 is provided on the other side of the storage bin;

A discharging and packaging device, wherein a feeding port on one side of the discharging and packaging device is connected to the storage bin, and a second discharging port is provided on the other side;

A power unit located at the bottom, used to move the entire curing unit;

All flow valves, stirring devices, die pressing devices, and discharging and packaging devices are connected to the PLC controller.

Preferably, the soft soil feed hopper and each of the feed hoppers are connected and fixed by a steel pipe device.

Preferably, the soft soil feed hopper and the top feed port of each feed hopper are provided with a crusher; and a ball mill or a mixer is provided between each flow valve and the corresponding mixing bin inlet.

Preferably, the soft soil feed hopper is located downstream of the material movement direction of the stirring device relative to the seven feed hoppers.

Preferably, a detection device for detecting soft soil is provided in the soft soil feed hopper, which includes a moisture content measuring device, an organic matter detecting device, a salt content detecting device, a heavy metal detecting device, and an organic matter detecting device, and the detecting device is connected to a PLC controller.

Preferably, at least one of a strength detection device and a crack detection device is provided between the die pressing device and the storage bin.

More preferably, the die pressing device is connected to the strength detection device inlet on one side of the strength detection device, the strength detection device is connected to the crack detection device inlet on one side of the crack detection device, and the crack detection device is connected to the storage bin inlet; the strength detection device and the crack detection device are both connected to the PLC controller.

The present invention includes a high-water content sludge solidifying agent, which can partially replace cement, uses bulk solid wastes such as construction solid waste and industrial solid waste, and uses fiber materials and polymer materials, which are environmentally friendly and pollution-free, and are conducive to ecological protection. A high-water content sludge solidification treatment system is provided, which is controlled by a PLC controller, is provided with a stirring device for stirring, and a die pressing device for pressing and molding. During this process, the system randomly extracts samples for strength testing and crack testing, and then can be packaged and discharged. The entire device can be moved by power to cope with the complex site environment on site.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a curing device provided by the present invention;

FIG. 2 is a schematic diagram of a detection device.

DETAILED DESCRIPTION

In order to make the present invention more clearly understood, preferred embodiments are described in detail below with reference to the accompanying drawings.

The solidification device used in each embodiment is shown in FIG. 1-2 , which is a solid waste-based high-water content soft soil solidification device, comprising:

Automatic opening and closing device 1;

A soft soil feed hopper 9 and seven feed hoppers for feeding seven kinds of raw materials of the solid waste-based high-water content soft soil curing agent;

A stirring device 36, the stirring device 26 is provided with a stirring bin 50, and the stirring bin 50 is provided with 8 stirring bin inlets (arranged in the order of stirring bin inlet 1 25, stirring bin inlet 26, stirring bin inlet 3 27, stirring bin inlet 4 28, stirring bin inlet 5 29, stirring bin inlet 6 30, stirring bin inlet 7 31, stirring bin inlet 8 32 along the material movement direction of the stirring device 36), and a stirring device outlet 37 is provided at the downstream of the stirring device 36 along the material movement direction;

The 7 feed hoppers are: a first feed hopper 2, a second feed hopper 3, a third feed hopper 4, a fourth feed hopper 5, a fifth feed hopper 6, a sixth feed hopper 7, a seventh feed hopper 8, and a soft soil feed hopper 9. Construction solid waste is placed in the first feed hopper 2, industrial solid waste is placed in the second feed hopper 3, biomass solid waste is placed in the third feed hopper 4, excitation materials are placed in the fourth feed hopper 5, cement is placed in the fifth feed hopper 6, fiber materials are placed in the sixth feed hopper 7, and polymer materials are placed in the seventh feed hopper 8. The first feed hopper 2 is provided with a first flow valve 11 at the discharge port, and the first flow valve 11 is connected to the first ball mill 18, and the first ball mill 18 is connected to the mixing bin inlet 1 25. The second feed hopper 3 is provided with a second flow valve 12 at the discharge port, and the second flow valve 12 is connected to the second ball mill 19, and the second ball mill 19 is connected to the mixing bin inlet 26. The third feed hopper 4 is provided with a third flow valve 13 at the discharge port, and the third flow valve 13 is connected to a third ball mill 20, the third ball mill 20 is connected to the mixing bin inlet three 27, a fourth feed hopper 5 is provided with a fourth flow valve 14 at the discharge port, the fourth flow valve 14 is connected to the first mixer 21, the first mixer 21 is connected to the mixing bin inlet four 28, a fifth feed hopper 6 is provided with a fifth flow valve 15 at the discharge port, the fifth flow valve 15 is connected to the second mixer 22, the second mixer 22 is connected to the mixing bin inlet five 29, a sixth feed hopper 7 is provided with a sixth flow valve 16 at the discharge port, the sixth flow valve 16 is connected to the third mixer 23, the third mixer 23 is connected to the mixing bin inlet six 30, a seventh feed hopper 8 is provided with a seventh flow valve 17 at the discharge port, the seventh flow valve 17 is connected to the fourth mixer 24, the fourth mixer 24 is connected to the mixing bin inlet seven 31, high-water content soft soil is placed in the high-water content soft soil feed hopper 9, and an eighth flow valve 33 is provided at the discharge port of the high-water content soft soil feed hopper, and the eighth flow valve 33 is connected to the mixing bin inlet eight 32;

A die pressing device 39, wherein the die pressing device 39 is provided with a die pressing device inlet 38, and the die pressing device inlet 38 is connected to the stirring device outlet 37;

A storage bin 44, a storage bin inlet 45 on one side of the storage bin 44 is connected to the die pressing device 39; a discharge port 46 is provided on the other side of the storage bin 44;

A discharging and packaging device 47, wherein a feed port 51 on one side of the discharging and packaging device 47 is connected to the storage bin 44, and a second discharging port 48 is provided on the other side;

A power device 49 located at the bottom is used to move the entire curing device;

All flow valves 18, stirring devices 36, die pressing devices 39, and discharging and packaging devices 47 are connected to the PLC controller.

The soft soil feed hopper 9 and each of the feed hoppers are connected and fixed by a steel pipe device 10.

The soft soil feed hopper 9 and the top feed port of each feed hopper are provided with a crusher 35 .

The soft soil feed hopper 9 is provided with a detection device for detecting soft soil, as shown in FIG. 2 , which includes a moisture content determination device 341 , an organic matter detection device 342 , a salt content detection device 343 , a heavy metal detection device 344 , and an organic matter detection device 345 .

A strength detection device 40 and a crack detection device 42 are also provided between the die pressing device 39 and the storage bin 44. The die pressing device 39 is connected to a strength detection device inlet 41 on one side of the strength detection device 40, the strength detection device 40 is connected to a crack detection device inlet 43 on one side of the crack detection device 42, and the crack detection device 42 is connected to a storage bin inlet 45; the strength detection device 40 and the crack detection device 42 are both connected to a PLC controller.

When in use, the high-water content soft soil obtained on site is added to the soft soil feed hopper 9, and the moisture content measuring device 341, the organic matter detection device 342, the salt content detection device 343, the heavy metal detection device 344, and the organic matter detection device 345 measure its moisture content, organic matter content, salt content, heavy metal concentration, and organic matter concentration, and send the information to the PLC controller. After receiving the information, the PLC controller processes the data, determines and controls the opening and closing of the first flow valve 11, the second flow valve 12, the third flow valve 13, the fourth flow valve 14, the fifth flow valve 15, the sixth flow valve 16, the seventh flow valve 17, and the eighth flow valve 18, thereby controlling the ratio of the curing agent entering the stirring device 36 and the amount of high-water content soft soil added, thereby achieving regulation. The solidified soil is stirred in the mixing bin 48 of the stirring device 36, and is pressed into products of required specifications by the pressing mold device 39. These products pass through the strength detection device 40 and the crack detection device 42 and enter the storage bin 43. During this process, the system randomly selects samples for strength detection and crack detection. The products in the storage bin 43 can be discharged through the discharge port 1 45, or enter the discharge packaging device 46, and then be discharged through the discharge port 2 47 after packaging. The entire equipment is moved by the power device 48 to cope with the complex site environment.

Example 1

A mud sample of high-water content soft soil was taken, and its water content was measured to be 91%, the mass percentage of organic matter was 3.11%, and the salt concentration was 0.359%.

The required strength of the construction site is 500kPa, so construction solid waste (fineness: 550μm), industrial solid waste (fineness: 270μm),

Biomass solid waste (fineness: 380μm), the site to be constructed requires heavy metal content ≤ 0.005mg/L, so the proportion of curing agent and solidified soil weight is selected as 9%. The site to be constructed requires slight cracks, so the proportion of component six is selected as 4%. The site to be constructed requires on-site construction.

Comprehensively select a high-water content curing agent: select construction solid waste, industrial solid waste, biomass solid waste, alkali-activated materials, cement, fiber materials, polymer materials (mass ratio 10:40:30:8:7:4:1) and add them to high-water content soft soil for curing. After stirring through a stirring device, it is sent out through a discharge port for on-site curing. The solidified material is pressed and molded with a comprehensive volume reduction of 35.5% and a strength of 755kPa.

Example 2

A mud sample of high-water content soft soil was taken, and its water content was measured to be 86%, the mass percentage of organic matter was 5.31%, and the salt concentration was 0.569%.

The required strength of the construction site is 1.1MPa, so construction solid waste (fineness: 250μm), industrial solid waste (fineness: 115μm),

Biomass solid waste (fineness: 96μm), the site to be constructed requires heavy metal content ≤ 0.008mg/L, so the proportion of curing agent and solidified soil weight is selected as 7%. The site to be constructed requires slight cracks, so the proportion of component six is selected as 4%. The site to be constructed requires on-site construction.

Comprehensively select a high-water content curing agent: select construction solid waste, industrial solid waste, biomass solid waste, alkali-activated materials, cement, fiber materials, polymer materials (mass ratio 15:40:25:8:7:4:1) and add them to high-water content soft soil for curing. After stirring through a stirring device, it is sent out through a discharge port for on-site curing. The solidified material is pressed and molded with a comprehensive volume reduction of 41.3% and a strength of 1.36MPa.

Example 3

A mud sample of high-water content soft soil was taken, and its water content was measured to be 95%, the mass percentage of organic matter was 12.36%, and the salt concentration was 2.35%.

The required strength of the construction site is 2.2MPa, so construction solid waste (fineness: 23μm), industrial solid waste (fineness: 58μm),

Biomass solid waste (fineness: 45μm), the site to be constructed requires heavy metal content ≤ 0.011mg/L, so the proportion of curing agent and solidified soil weight is selected as 2%. The site to be constructed requires slight cracks, so the proportion of component six is selected as 4%. The site to be constructed requires on-site construction.

Comprehensively select a high-water content curing agent: select construction solid waste, industrial solid waste, biomass solid waste, alkali-activated materials, cement, fiber materials, polymer materials (mass ratio 20:40:20:9:6:4:1) and add them to high-water content soft soil for curing. After stirring through a stirring device, it is sent out through a discharge port for on-site curing. The cured material is pressed and molded with a comprehensive volume reduction of 31.5 and a strength of 2.25MPa.

Claims (10)

1. The solid waste base high water content soft soil curing agent is characterized in that raw materials comprise building solid waste, industrial solid waste, biomass solid waste, alkali excitation materials, cement, fiber materials and high polymer materials.

2. The solid waste-based high-water-content soft soil curing agent according to claim 1, wherein the building solid waste is at least one of red brick powder and waste concrete regenerated micro powder; the industrial solid waste is at least one of mineral powder, steel slag powder and carbide slag powder; the biomass solid waste is at least one of rice hull ash; the alkali excitation material is quicklime, sodium hydroxide and magnesium hydroxide.

3. The solid waste base high water content soft soil curing agent according to claim 1, wherein the relation between the water content of the solid waste base high water content soft soil and the mass ratio of building solid waste, industrial solid waste and biomass solid waste is shown in table 1:

TABLE 1

The mass content of organic matters, the mass concentration of salt and the mass of raw materials in the solid waste base high-water-content soft soil are shown in table 2:

TABLE 2

In table 2, the mass ratio is the mass ratio of building solid waste, industrial solid waste, biomass solid waste, alkali-activated material, cement, fiber material and polymer material in order;

the relation between the strength of the solidification required by the solid waste base high water content soft soil and the specification of part of raw materials is shown in table 3:

TABLE 3 Table 3

Intensity range Building solid waste Industrial solid waste Solid waste of biomass ≤1MPa 270-550μm 150-270μm 106-380μm > 1 and < 2MPa 25-250μm 74-115μm 48-96μm ≥2MPa 6.5-23μm 18-58μm 10-45μm

；

The relation between the environmental protection requirement of the solid waste base high water content soft soil and the mass percentage of part of raw materials is shown in table 4:

TABLE 4 Table 4

Environmental protection requirement Alkali-activated material Cement and its preparation method Has low carbon and environmental protection requirements ≤5％ 0％ No low carbon environmental protection requirement ≤10％ ≤7％

；

When the solid waste base high water content soft soil is used for the solid waste leaching toxicity test, the relation between the concentration control range of heavy metal and the mass percentage of the heavy metal in solidified soil is shown in table 5:

TABLE 5

Concentration control range of heavy metals Mass percent of heavy metals ≤0.005mg/L 9％ Greater than 0.005mg/L and less than 0.01mg/L 7％ ≥0.01mg/L 2％

；

The relation between the crack control range of the solid waste base high water content soft soil after solidification and the mass percentage of the fiber material is shown in table 6:

TABLE 6

Crack control range Mass percent of fibrous material Slight cracking ≥4％ General cracking ≤4％

。

4. The utility model provides a high moisture content weak soil solidification equipment of solid useless base which characterized in that includes:

an automatic opening and closing device (1);

a soft soil feed hopper (9) and 7 feed hoppers for 7 raw materials of the solid waste base high water content soft soil curing agent as claimed in any one of claims 1 to 8, wherein a flow valve is arranged below the soft soil feed hopper (9) and each feed hopper;

the stirring device (36), the stirring device (26) is provided with a stirring bin (50), 8 stirring bin inlets communicated with 8 flow valves are arranged on the stirring bin (50), and a stirring device outlet (37) is arranged at the downstream of the stirring device (36) along the material movement direction;

the die assembly (39), there are die assembly inlets (38) on the die assembly (39), the die assembly inlet (38) communicates with outlet (37) of the stirring device;

a storage bin (44), wherein a storage bin inlet (45) at one side of the storage bin (44) is communicated with the compression molding device (39); a first discharge hole (46) is formed in the other side of the storage bin (44);

the discharging packaging device (47), a feeding hole (51) at one side of the discharging packaging device (47) is communicated with the storage bin (44), and a discharging hole II (48) is arranged at the other side of the discharging packaging device;

a power unit (49) at the bottom for moving the whole curing unit;

all flow valves (18), stirring devices (36), pressing die devices (39) and discharging and packaging devices (47) are connected with the PLC.

5. The solid waste base high water content soft soil solidifying device according to claim 1, wherein the soft soil feed hopper (9) and each feed hopper are fixedly connected through a steel pipe device (10).

6. The solid waste base high water content soft soil curing device according to claim 1, wherein a crusher (35) is arranged at the soft soil feed hopper (9) and the top feed inlet of each feed hopper; a ball mill or a stirrer is arranged between each flow valve and the inlet of the corresponding stirring bin.

7. A solid waste based high moisture content soft soil solidifying means as claimed in claim 1, wherein the soft soil hopper (9) is located downstream of the stirring means (36) in the material movement direction with respect to the 7 hoppers.

8. The solid waste base high water content soft soil curing device according to claim 1, wherein a detection device for detecting soft soil is arranged in the soft soil feed hopper (9), and comprises a water content detection device (341), an organic matter detection device (342), a salt content detection device (343), a heavy metal detection device (344), an organic matter detection device (345) and a PLC (programmable logic controller).

9. The solid waste base high water content soft soil solidifying device according to claim 1, wherein at least one of a strength detecting device (40) and a crack detecting device (42) is further arranged between the die assembly (39) and the storage bin (44).

10. The solid waste base high water content soft soil curing device according to claim 9, wherein the pressing die device (39) is connected with an intensity detection device inlet (41) at one side of the intensity detection device (40), the intensity detection device (40) is communicated with a crack detection device inlet (43) at one side of the crack detection device (42), and the crack detection device (42) is communicated with a storage bin inlet (45); the strength detection device (40) and the crack detection device (42) are connected with the PLC.

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