Filling material production apparatus and filling material production method

Abstract

The application discloses a filling material preparation device and a filling material preparation method. The filling material preparation device comprises: an aggregate slurry supply device, which has an aggregate slurry outlet; a cementitious material supply device, which has a cementitious material outlet; a slurry preparation device, which has a cementitious material inlet, a water inlet and a slurry outlet, and the cementitious material inlet and the cementitious material outlet are communicated; and a conveying device, which has a feeding inlet, and the feeding inlet is communicated with the aggregate slurry outlet and the slurry outlet. The filling material preparation device has the advantages of high cementitious material utilization rate, low filling material preparation cost, good filling material fluidity and uniform filling material strength.

Description

Technical Field

[0001] This invention relates to the field of mine backfilling technology, specifically to backfill material preparation equipment and backfill material preparation methods. Background Technology

[0002] Filler preparation refers to the process of mixing cementitious materials (cement, cementitious powder, etc.), aggregates (tailings, gangue, Gobi aggregate, etc.) and water in a certain proportion to prepare a slurry that meets the requirements of fluidity, concentration and strength, so as to transport and fill it into the underground goaf. Summary of the Invention

[0003] This invention is based on the inventor's discoveries and understanding of the following facts and problems: In related technologies, tailings slurry and dry powdered cementitious materials are mixed and stirred in a set ratio (with an appropriate amount of water added to adjust the concentration) in order to prepare filling material.

[0004] When the cementitious material is fed directly into the mixer in dry powder form, its surface rapidly hydrates upon contact with the tailings mortar, forming "liquid-encapsulated powder" agglomerates. The unhydrated cementitious material inside these agglomerates is trapped and unable to participate in the hydration reaction, resulting in reduced utilization of the cementitious material. Furthermore, the mixing blades struggle to break up these dense agglomerates, leading to uneven strength of the filling material and substandard localized strength.

[0005] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, this invention proposes a filling material preparation apparatus and a filling material preparation method.

[0006] The filling material preparation equipment of the present invention includes: an aggregate slurry supply device having an aggregate slurry outlet; a cementitious material supply device having a cementitious material outlet; a slurry preparation device having a cementitious material inlet, a water inlet, and a slurry outlet, the cementitious material inlet and the cementitious material outlet being connected; and a conveying device having a feed inlet, the feed inlet being connected to both the aggregate slurry outlet and the slurry outlet.

[0007] The filling material preparation equipment of the present invention has the advantages of high utilization rate of cementitious materials, low preparation cost of filling material, good fluidity of filling material, and uniform strength of filling material.

[0008] Optionally, the aggregate slurry supply device is a tailings thickening device; and / or the slurry preparation device is a Venturi mixer, a stirred slurry machine, or a jet mixer.

[0009] Optionally, the cementitious material supply device includes: a silo; a screw conveyor, the inlet of which is connected to the outlet of the silo, the outlet of which constitutes the cementitious material outlet; and a metering scale, which is located between the outlet of the screw conveyor and the cementitious material inlet of the pulping device to allow the cementitious material to be quantitatively fed into the pulping device.

[0010] Optionally, the filling material preparation equipment further includes a slurry storage device, wherein the slurry inlet of the slurry storage device is connected to the slurry outlet of the slurry preparation device, and the slurry outlet of the slurry storage device is connected to the feed inlet of the conveying device.

[0011] Optionally, the filling material preparation equipment further includes a water storage device and a water pump, wherein the inlet of the water pump is connected to the water storage device, and the outlet of the water pump is connected to the inlet of the pulping device.

[0012] Optionally, the filling material preparation equipment further includes a mixing device, the inlet of which is connected to the outlet of the conveying device.

[0013] Optionally, the mixing device includes: a conveying pipe, the inlet of which is connected to the outlet of the conveying device; and a static mixer disposed inside the conveying pipe.

[0014] Optionally, the static mixer includes at least one of a spiral blade, a corrugated plate, and a slanted blade; or the length-to-diameter ratio of the conveying pipe is (3-10):1; or the inlet of the conveying pipe is connected to the outlet of the conveying device via a connecting pipe, the length-to-diameter ratio of the connecting pipe being (4-6):1.

[0015] The filling material preparation method of the present invention includes: mixing a cementitious material and water to obtain a cementitious material slurry; and mixing an aggregate slurry and the cementitious material slurry to obtain a filling material.

[0016] The filling material preparation method of the present invention has the advantages of high utilization rate of cementitious materials, low preparation cost of filling material, good fluidity of filling material, and uniform strength of filling material.

[0017] Optionally, the aggregate slurry and the cementitious material slurry are mixed using a static mixer to obtain the filling material; and / or the ash-sand ratio of the filling material is 1:(7-9). Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the filling material preparation equipment according to an embodiment of the present invention; Figure 2This is a partial structural schematic diagram of the filling material preparation equipment according to an embodiment of the present invention. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0020] The filling material preparation apparatus 100 according to an embodiment of the present invention will now be described with reference to the accompanying drawings. Figure 1 and Figure 2 As shown, the filler preparation equipment 100 according to an embodiment of the present invention includes an aggregate slurry supply device 1, a cementitious material supply device 2, a slurry preparation device 3, and a conveying device 4.

[0021] The aggregate slurry supply device 1 has an aggregate slurry outlet 11, and the cementitious material supply device 2 has a cementitious material outlet 21. The pulping device 3 has a cementitious material inlet 31, a water inlet 32, and a slurry outlet 33. The cementitious material inlet 31 of the pulping device 3 and the cementitious material outlet 21 of the cementitious material supply device 2 are connected. The conveying device 4 has a feed inlet 41, which is connected to both the aggregate slurry outlet 11 of the aggregate slurry supply device 1 and the slurry outlet 33 of the pulping device 3.

[0022] The filler preparation apparatus 100 according to an embodiment of the present invention, by providing a slurry preparation device 3, can mix cementitious materials and water to obtain a cementitious material slurry. Then, the obtained cementitious material slurry and aggregate slurry are mixed to obtain the filler.

[0023] By first mixing the cementitious material with water, the particles of the cementitious material can be effectively and fully dispersed, thus effectively preventing the "liquid-encapsulated powder" phenomenon. This prevents the presence of unhydrated cementitious material, thereby effectively improving the utilization rate of the cementitious material, reducing the amount of cementitious material used, and lowering the preparation cost of the filling material.

[0024] By first mixing the cementitious material with water, the cementitious material can be evenly distributed in the cementitious slurry, and subsequently, evenly distributed in the filling material. This effectively improves the uniformity of the filling material's strength and prevents localized areas of insufficient strength.

[0025] Furthermore, by first mixing the cementitious material and water to obtain a cementitious slurry, and then mixing the cementitious slurry with the aggregate slurry, the excellent compatibility of both the cementitious slurry and the aggregate slurry is achieved, given that both are in a fluid state. This allows for a more uniform mixing of the cementitious slurry and the aggregate slurry, effectively improving the fluidity of the filling material to significantly increase the filling contact rate, and also effectively improving the uniformity of the filling material's strength, preventing the problem of substandard local strength in the filling material.

[0026] In addition, improving the mixing uniformity of cementitious material slurry and aggregate slurry can appropriately reduce the amount of cementitious material used, thereby reducing the preparation cost of filler.

[0027] Therefore, the filling material preparation equipment 100 according to the present invention has the advantages of high utilization rate of cementitious materials, low cost of filling material preparation, good fluidity of filling material, and uniform strength of filling material.

[0028] like Figure 1 and Figure 2 As shown, the filling material preparation equipment 100 includes an aggregate slurry supply device 1, a cementitious material supply device 2, a slurry preparation device 3, a slurry storage device 5, a conveying device 4, and a mixing device 7.

[0029] The cementitious material supply device 2 includes a silo 22, a screw conveyor 23, and a weighing scale. The inlet 231 of the screw conveyor 23 is connected to the outlet 221 of the silo 22. The outlet 232 of the screw conveyor 23 constitutes the cementitious material outlet 21, that is, the outlet 232 of the screw conveyor 23 is connected to the cementitious material inlet 31 of the pulping device 3. The weighing scale is located between the outlet 232 of the screw conveyor 23 and the cementitious material inlet 31 of the pulping device 3 to ensure that the cementitious material is quantitatively fed into the pulping device 3.

[0030] The cementitious material can be cement, or it can be other cementitious materials such as cementitious powder that meet the strength requirements of the filling body. The silo 22 is used for the sealed storage of dry powder cementitious material, ensuring that the cementitious material is dry and free of lumps. The cementitious material in the silo 22 enters the screw conveyor 23 sequentially through the discharge port 221 and the inlet port 231. The screw conveyor 23 transports the cementitious material to the pulping device 3.

[0031] The screw conveyor 23 and the metering scale can form a quantitative feeding assembly to achieve quantitative and continuous feeding of cementitious materials and precise control of the feeding amount.

[0032] like Figure 1 and Figure 2As shown, the slurry preparation device 3 has a cementitious material inlet 31, a water inlet 32, and a slurry outlet 33. The cementitious material enters the slurry preparation device 3 through the cementitious material inlet 31, and water enters the slurry preparation device 3 through the water inlet 32. The cementitious material and water are mixed in the slurry preparation device 3 to obtain a cementitious slurry. For example, cement (dry powder) and water are mixed in the slurry preparation device 3 to prepare a homogeneous cement slurry with a mass concentration of 40%-60%.

[0033] Optionally, the pulping device 3 is a Venturi mixer, a stirred pulper, or a jet mixer. This allows the negative pressure generated by the high-speed water flow to draw in the cementitious material, achieving low-energy, high-efficiency mixing of the cementitious material and water to prepare a uniform cementitious slurry.

[0034] like Figure 1 As shown, the filling material preparation equipment 100 also includes a water storage device 61 and a water pump 62. The water inlet 621 of the water pump 62 is connected to the water storage device 61, and the water outlet 622 of the water pump 62 is connected to the water inlet 32 ​​of the pulping device 3. The water pump 62 transports water from the water storage device 61 to the pulping device 3.

[0035] like Figure 1 and Figure 2 As shown, the slurry storage device 5 has a slurry inlet 51 and a slurry outlet 52. The slurry inlet 51 of the slurry storage device 5 is connected to the slurry outlet 33 of the slurry preparation device 3, and the slurry outlet 52 of the slurry storage device 5 is connected to the feed inlet 41 of the conveying device 4. The prepared cementitious slurry can be stored in the slurry storage device 5 to enable the filling material preparation equipment 100 to operate more smoothly.

[0036] The slurry storage device 5 may be equipped with a stirrer 53, which is used to continuously and gently stir the cementitious slurry in the slurry storage device 5 so as to keep the cementitious slurry in a uniform suspension state and prevent the cementitious slurry from settling and separating.

[0037] Aggregates can be tailings, gypsum, gangue, fly ash, steel slag, river sand, manufactured sand, Gobi aggregate, etc. Gypsum, gangue, fly ash, steel slag, river sand, manufactured sand, Gobi aggregate, etc., can be mixed with water to obtain aggregate slurry. Other additives can be added to the aggregate as needed, such as water-reducing agents, accelerators / retarders, thickeners / water-retaining agents, reinforcing agents, expansion agents, etc.

[0038] like Figure 1 As shown, the aggregate slurry supply device 1 is a tailings thickening device, meaning the aggregate can be tailings. For example, the aggregate slurry supply device 1 can be a deep cone thickener. The aggregate slurry outlet 11 of the aggregate slurry supply device 1 can output high-concentration tailings slurry (mass concentration 70%-80%).

[0039] The conveying device 4 has an inlet 41. The inlet 41 of the conveying device 4 is connected to the aggregate slurry outlet 11 of the aggregate slurry supply device 1 so that the conveying device 4 can convey the aggregate slurry in the aggregate slurry supply device 1. The inlet 41 of the conveying device 4 is also connected to the slurry outlet 33 (slurry outlet 52 of the slurry storage device 5) of the pulping device 3 so that the conveying device 4 can convey the cementitious material slurry in the pulping device 3 (slurry storage device 5). The conveying device 4 may be a conveying pump.

[0040] like Figure 1 As shown, the feed inlet 41 of the conveying device 4 is connected to the aggregate slurry outlet 11 of the aggregate slurry supply device 1 via the pipeline 81. A slurry inlet is provided at an appropriate position on the pipeline 81, and the slurry inlet is connected to the slurry outlet 33 of the slurry preparation device 3 (the slurry outlet 52 of the slurry storage device 5) so that the cementitious slurry (cement slurry) can be quantitatively and accurately injected into the aggregate slurry (tailings slurry) through the slurry inlet.

[0041] Optionally, a flow meter and a frequency converter can be installed between the slurry outlet 33 of the slurry preparation device 3 (the slurry outlet 52 of the slurry storage device 5) and the feed inlet 41 of the conveying device 4, so as to adjust the amount of cementitious slurry added in real time according to the filling strength requirements. This allows for real-time adjustment of the cement-sand ratio according to the strength requirements of different parts of the stope (stope / pillar), achieving "on-demand slurry supply" and avoiding waste of cementitious materials.

[0042] like Figure 1 and Figure 2 As shown, the inlet of the mixing device 7 and the outlet 42 of the conveying device 4 are connected. By setting up the mixing device 7, the aggregate slurry and the cementitious material slurry can be mixed more evenly, which can not only further improve the fluidity of the filling material to further improve the filling contact rate, but also further improve the uniformity of the strength of the filling material and further prevent the problem of local strength failure of the filling material.

[0043] like Figure 1 and Figure 2 As shown, the mixing device 7 includes a conveying pipe 71 and a static mixer 72. The inlet 711 of the conveying pipe 71 is connected to the outlet 42 of the conveying device 4, and the inlet 711 of the conveying pipe 71 constitutes the inlet of the mixing device 7. The static mixer 72 is disposed inside the conveying pipe 71. The static mixer 72 can mix the aggregate slurry and the cementitious material slurry more evenly.

[0044] Existing technologies use vertical mixing tanks and horizontal twin-shaft continuous mixers to mix aggregate slurry and cementitious materials. The power consumption of vertical mixing tanks and horizontal twin-shaft continuous mixers is generally above 45kW, resulting in high preparation costs and operation costs of filling materials.

[0045] This application utilizes a static mixer 72 to mix aggregate slurry and cementitious material slurry, thereby achieving efficient mixing without power by leveraging the kinetic energy of the aggregate slurry and cementitious material slurry themselves. This significantly reduces the energy consumption of the filling material preparation equipment 100, effectively lowering the preparation cost and operation cost of the filling material. The filling material preparation equipment 100 eliminates the need for a stirring motor (approximately 45kW), reducing the total power consumption of the filling material preparation equipment 100 by more than 85%, resulting in a substantial decrease in energy consumption.

[0046] Furthermore, by using a static mixer 72 to mix the aggregate slurry and cementitious material slurry, there is no need to install high-power mixing equipment and complex mixing control systems. This not only simplifies the process flow and equipment configuration, but also effectively reduces the installation height of the filling material preparation equipment 100, reduces the floor space occupied by the filling material preparation equipment 100, and reduces the civil engineering investment of the filling material preparation equipment 100 (civil engineering investment is reduced by 20%-30%).

[0047] Furthermore, by setting up a static mixer 72, the mixing device 7 can be made without moving parts. This can greatly reduce the wear rate and daily maintenance of the mixing device 7 and the filling material preparation equipment 100, thereby greatly improving the service life of the mixing device 7 and the filling material preparation equipment 100, as well as their reliability and applicability in complex mining conditions, and making it easier to achieve industrial promotion.

[0048] Optionally, the static mixer 72 includes at least one of a spiral blade, a corrugated plate, and a slanted blade. This allows the cementitious slurry and aggregate slurry to be fully separated and rotated during flow, achieving efficient and uniform mixing without power.

[0049] like Figure 1 and Figure 2 As shown, there are multiple static mixers 72, which are spaced apart along the extension direction (length direction) of the conveying pipe 71. This allows for a more uniform and thorough mixing of the aggregate slurry and the cementitious material slurry.

[0050] After mixing the cementitious slurry and aggregate slurry, filling material can be obtained. Optionally, the mass concentration of the filling material is 65%-75%. The filling material can be directly transported downhole to fill voids to form a filling body. The filling body has a 28-day compressive strength of 1.5 MPa, meeting the strength requirements for mining operations.

[0051] Optionally, the length-to-diameter ratio of the conveying pipe 71 is (3-10):1. This allows for a more uniform and thorough mixing of the aggregate slurry and the cementitious material slurry, thereby not only further improving the fluidity of the filling material to increase the filling contact rate, but also further improving the uniformity of the filling material's strength and preventing the problem of substandard local strength of the filling material.

[0052] Optionally, the length-to-diameter ratio of the conveying pipe 71 is (5-8):1. This allows for a more uniform and thorough mixing of the aggregate slurry and the cementitious material slurry, thereby not only further improving the fluidity of the filling material to increase the filling contact rate, but also further improving the uniformity of the filling material's strength and preventing the problem of substandard local strength of the filling material.

[0053] Optionally, the length of the conveying pipe 71 is greater than or equal to 430 mm and less than or equal to 1500 mm. More preferably, the length of the conveying pipe 71 is greater than or equal to 700 mm and less than or equal to 1150 mm.

[0054] like Figure 1 and Figure 2 As shown, the inlet 711 of the conveying pipe 71 is connected to the outlet 42 of the conveying device 4 via the connecting pipe 82. The length-to-diameter ratio of the connecting pipe 82 is (4-6):1. This allows the connecting pipe 82 to have an appropriate length, which not only reduces the turbulence of the cementitious slurry and aggregate slurry, thereby reducing wear on the static mixer 72 and extending its service life, but also allows sufficient mixing time for the aggregate slurry and cementitious slurry, resulting in more uniform and thorough mixing.

[0055] Optionally, the length of the connecting pipe 82 is greater than or equal to 550 mm and less than or equal to 850 mm.

[0056] This invention also discloses a method for preparing fillers. The method for preparing fillers according to embodiments of this invention includes: Mix the cementitious material with water to obtain a cementitious slurry; and Aggregate slurry and cementitious material slurry are mixed to obtain filler.

[0057] Accordingly, the filling material preparation method according to the embodiments of the present invention has the advantages of high utilization rate of cementitious materials, low preparation cost of filling material, good fluidity of filling material, and uniform strength of filling material.

[0058] Optionally, the ash-sand ratio of the filling material is 1:(7-9).

[0059] The cost of cementitious materials (cement) accounts for more than 65% of the backfilling operation cost. In the existing technology, due to insufficient mixing, in order to ensure that the downhole backfill reaches the design strength (usually required to be 1MPa-3MPa), the proportion of cementitious materials (cement) added is forced to be increased. The excessive addition of cementitious materials (cement) directly leads to a significant increase in backfilling operation costs.

[0060] The filling material prepared by the filling material preparation equipment 100 and the filling material preparation method of the present invention has a lower ash-sand ratio than that of filling materials in the prior art. In other words, the amount of cementitious material (cement) used in the filling material prepared by the filling material preparation equipment 100 and the filling material preparation method of the present invention is less than that used in filling materials in the prior art. This effectively reduces the operating cost of filling.

[0061] This invention adopts the technical route of "first making slurry, then mixing". The core is to change the cementitious material from the traditional dry powder state to the liquid state (changing the addition form of the cementitious material), which solves the problem of agglomeration formed by the contact between dry powder cementitious material and aggregate slurry from the source, and effectively improves the dispersibility of cementitious material.

[0062] Moreover, changing the addition of cementitious materials from dry powder to liquid solves the problems of poor continuous stability and low metering progress of dry powder feeding. The slurry-state cementitious material slurry is easier to control the flow rate accurately, and the addition ratio can be adjusted in real time, which significantly improves the utilization rate of cementitious materials.

[0063] This invention also changes the mixing mechanism, replacing the traditional "mechanical stirring" with "Venturi high-efficiency mixing + static mixer fluid turbulence mixing". The Venturi mixer enables low-energy preparation of cementitious material slurry, while the static mixer utilizes the kinetic energy of the cementitious material slurry and aggregate slurry themselves to achieve efficient mixing without power, significantly reducing the energy consumption of the filling material preparation equipment 100.

[0064] This invention is applicable to tailings cemented backfilling in metal mines (gold, silver, copper, lead, zinc, iron, etc.), coal mine gangue backfilling, chemical mine gypsum backfilling, etc., and can be widely used in any mine backfilling scenario that requires mixing dry powder cementitious materials and aggregate slurry.

[0065] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0066] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0067] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0068] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0069] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0070] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A filling material preparation device, characterized in that, include: An aggregate slurry supply device, wherein the aggregate slurry supply device has an aggregate slurry outlet; A cementitious material supply device, wherein the cementitious material supply device has a cementitious material outlet; A pulping apparatus having a cementitious material inlet, a water inlet, and a slurry outlet, wherein the cementitious material inlet and the cementitious material outlet are connected; and A conveying device having a feed inlet that is connected to both the aggregate slurry outlet and the slurry outlet.

2. The filling material preparation equipment according to claim 1, characterized in that, The aggregate slurry supply device is a tailings thickening device; and / or The pulping device is a Venturi mixer, a stirred pulper, or a jet mixer.

3. The filling material preparation equipment according to claim 1, characterized in that, The cementitious material supply device includes: silos; A screw conveyor, wherein the inlet of the screw conveyor is connected to the outlet of the hopper, and the outlet of the screw conveyor constitutes the outlet of the cementitious material; and A weighing scale is provided between the discharge port of the screw conveyor and the cementitious material inlet of the pulping device to allow the cementitious material to be quantitatively fed into the pulping device.

4. The filling material preparation equipment according to claim 1, characterized in that, It also includes a slurry storage device, the slurry inlet of which is connected to the slurry outlet of the pulping device, and the slurry outlet of which is connected to the feed inlet of the conveying device.

5. The filling material preparation equipment according to claim 1, characterized in that, It also includes a water storage device and a water pump, wherein the inlet of the water pump is connected to the water storage device, and the outlet of the water pump is connected to the inlet of the pulping device.

6. The filling material preparation equipment according to claim 1, characterized in that, It also includes a mixing device, the inlet of which is connected to the outlet of the conveying device.

7. The filling material preparation equipment according to claim 6, characterized in that, The mixing device includes: A conveying pipe, wherein the inlet of the conveying pipe is connected to the outlet of the conveying device; and A static mixer is disposed inside the delivery pipe.

8. The filling material preparation equipment according to claim 7, characterized in that, The static mixer includes at least one of a spiral blade, a corrugated plate, and a slanted blade; or The ratio of the length to the diameter of the conveying pipe is (3-10):1; or The inlet of the conveying pipe is connected to the outlet of the conveying device through a connecting pipe, and the ratio of the length to the diameter of the connecting pipe is (4-6):

1.

9. A method for preparing a filling material, characterized in that, include: Mix the cementitious material with water to obtain a cementitious slurry; and The aggregate slurry and the cementitious material slurry are mixed to obtain the filler.

10. The filling material preparation equipment according to claim 9, characterized in that, The aggregate slurry and the cementitious material slurry are mixed using a static mixer to obtain the filler; and / or The ash-sand ratio of the filling material is 1:(7-9).

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