Preparation process of early-strength desulfurization ash-based concrete

Abstract

The application discloses a preparation process of early-strength desulfurization ash-based concrete, which comprises the following steps: crushing and screening desulfurization ash, mixing and stirring the screened desulfurization ash with alkaline admixture and water, performing aging treatment after stirring, obtaining pretreated desulfurization ash, mixing the pretreated desulfurization ash, residue powder, additive and alkaline additive, grinding to obtain cementitious material, and mixing and stirring the cementitious material, sand, coarse aggregate and mixing water to obtain desulfurization ash-based concrete. Through the pretreatment of the desulfurization ash, the ammonium salt and ammonia water in the desulfurization ash are effectively eliminated, the performance of the cementitious material is improved, the activity and hydration rate of the concrete are improved, the compressive strength of the concrete is improved, and the comprehensive performance of the concrete is effectively improved.

Description

Technical Field

[0001] The invention relates to the field of concrete, in particular to a preparation process of early-strength desulfurized ash-based concrete. Background Art

[0002] Desulfurization ash is used as an admixture in cement, as a concrete admixture, as a roadbed material, for soil stabilization, and as an admixture in building blocks. When used as an admixture in cement, it can replace some clay and other silicate raw materials in cement to produce cement clinker. The addition of desulfurization byproducts to cement increases the setting time and heat of hydration of the blended cement. This improves mill output and grinding efficiency during the grinding process, while also reducing the amount of clinker required for cement production. However, in actual use, the presence of ammonium salts and ammonia water can lead to poor fluidity and insufficient hydration rates during the preparation process. Summary of the Invention

[0003] In order to further improve the hydration rate and fluidity, the present application provides a preparation process of early-strength desulfurized ash-based concrete.

[0004] The present application provides a preparation process for early-strength desulfurized ash-based concrete, which adopts the following technical solution:

[0005] A preparation process of early-strength desulfurized ash-based concrete comprises the following steps:

[0006] S1, crushing and screening the desulfurization ash;

[0007] S2, mixing the sieved desulfurization ash with alkaline admixture and water, and then performing aging treatment to obtain pretreated desulfurization ash;

[0008] S3, mixing the pretreated desulfurized ash, slag powder, admixture and alkaline additive and grinding them to obtain a gelling material;

[0009] S4, mixing the cementitious material with sand, coarse aggregate and mixing water and stirring to obtain desulfurized ash-based concrete.

[0010] Optionally, the alkaline admixture and the alkaline additive both include quicklime, and the admixture includes a melamine-based water reducer and fatty acid polyethylene glycol ester.

[0011] Optionally, a crusher is used in S1 to crush the desulfurization ash. The crusher includes a body, a crushing chamber is provided inside the body, and a crushing roller is rotatably connected in the crushing chamber. The crushing roller has crushing teeth for crushing the desulfurization ash. The top of the body has a feeding port connected to the crushing chamber, and the bottom of the body has a discharge port. The crushing roller is hollow and forms a heating channel. A heating medium passes through the heating channel.

[0012] Optionally, a filter screen is provided at the discharge port, and a driving member for driving the filter screen to vibrate is provided at a position of the machine body corresponding to the filter screen.

[0013] Optionally, one side of the body has an exhaust port connected to the crushing chamber, an exhaust fan is provided at the exhaust port, an exhaust pipe connected thereto is provided at the exhaust port, one end of the exhaust pipe away from the exhaust port is connected to the heating device, the heating device has an air inlet pipe connected to the heating channel, a filter is provided on the exhaust pipe, and a filter element is provided in the filter.

[0014] Optionally, the driving member includes a push rod vertically slidably connected to the body, and an impeller is rotatably connected to the corresponding push rod in the air intake pipe. The impeller has a central axis, and a cam is fixed on the central axis, which abuts against the push rod and pushes it upward.

[0015] Optionally, the crushing roller is connected to the machine body in an axial horizontal sliding manner, and an expansion block is provided at one end of the crushing roller corresponding to the crushing roller in the crushing chamber to drive it to move, and the expansion block abuts one end of the crushing roller, and an elastic reset member is provided at the end of the crushing roller away from the expansion block, and the elastic reset member abuts the end of the crushing roller.

[0016] Optionally, a lifting bucket is fixedly provided on the outer wall of the crushing roller, and when the crushing roller rotates, the lifting bucket lifts the desulfurization ash at the bottom of the crushing chamber to above the crushing roller.

[0017] Optionally, the lifting buckets and crushing teeth are alternately arranged along the axial direction.

[0018] Optionally, two crushing rollers are arranged horizontally at intervals, and the crushing teeth on adjacent crushing rollers are staggered.

[0019] In summary, this application includes at least one of the following beneficial technical effects:

[0020] 1. By pre-treating the desulfurization ash, the ammonium salt and ammonia water in the desulfurization ash can be effectively eliminated, the performance of the gel material can be improved, the activity and hydration rate of the concrete can be increased, and the compressive strength of the concrete can be increased, thereby effectively improving the comprehensive performance of the concrete;

[0021] 2. In the pretreatment of desulfurization ash, a special crusher is used for crushing. After crushing, the particle size is screened with the help of the filter screen at the discharge port. The desulfurization ash that meets the use requirements is discharged from the discharge port. The crushing and screening are achieved simultaneously, which improves production efficiency. In addition, the filter screen vibrates during use, which effectively reduces blockage and ensures good discharge efficiency of the desulfurization ash.

[0022] 3. The heating medium enters the heating channel during the crushing process and transfers heat to the crushing teeth, which dries the desulfurized ash during the crushing process, removes moisture from the desulfurized ash, and reduces the likelihood of the desulfurized ash adhering to the crushing teeth during the mixing process, thereby affecting the crushing effect;

[0023] 4. During the crushing process, the expansion block drives the crushing roller to move horizontally to adjust the position, so that more areas of the desulfurized ash in the crushing cavity are crushed, effectively improving the overall degree of crushing effect. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a flowchart of the embodiment of the present application.

[0025] Figure 2 is a whole structure diagram of the crusher in the embodiment of the present application.

[0026] Figure 3 is a structure diagram of the impeller and the top rod at the air inlet pipe in the embodiment of the present application.

[0027] BRIEF DESCRIPTION OF DRAWINGS

[0028] 1. machine body; 2. crushing roller; 3. crushing cavity; 4. feeding port; 5. discharging port; 6. driving motor; 7. crushing tooth; 8. filter screen; 9. mounting plate; 10. pulley; 11. belt; 12. heating channel; 13. heating device; 14. air inlet pipe; 15. air return pipe; 16. exhaust port; 17. exhaust fan; 18. exhaust pipe; 19. filter; 20. expansion block; 21. elastic return member; 22. mounting block; 23. top rod; 24. impeller; 25. center shaft; 26. cam; 27. lifting hopper. DETAILED DESCRIPTION

[0029] The following will be described in detail in combination with the accompanying Figure 1-3 The present application will be further described in detail.

[0030] The embodiment of the present application discloses a preparation process of early-strength desulfurized ash-based concrete.

[0031] As shown in the figure, a preparation process of early-strength desulfurized ash-based concrete includes the following steps: Figure 1 S1, crushing and screening, placing the desulfurized ash in the crusher for crushing, and then screening to obtain desulfurized ash with a particle size not greater than 120 mesh, and desulfurized ash with a particle size greater than 120 mesh is further crushed;

[0032]

[0033] ​S2, stirring and aging, mixing the desulfurization ash obtained in S1 with an alkaline mixing material and water and stirring them simultaneously, and then aging them after the stirring is completed to obtain pretreated desulfurization ash, wherein the aging time is 36 hours, and the alkaline mixing material is quicklime;

[0034] S3, mixing and grinding, mixing the pretreated desulfurization ash obtained in S2 with the slag powder, an admixture, and an alkaline additive, and grinding after thorough mixing to obtain a cementitious material, wherein the alkaline additive is quicklime, and the admixture includes a melamine-based water reducer and fatty acid polyethylene glycol ester;

[0035] S4, mixing and stirring, putting the cementitious material obtained in S3, sand, coarse aggregate and mixing water into a mixer, mixing and stirring for 5 minutes, to obtain the final desulfurized ash-based concrete.

[0036] The above method effectively eliminates ammonium salts and ammonia water in desulfurization ash by pre-treating the desulfurization ash, improves the performance of the gel material, increases the activity and hydration rate of concrete, and can increase the compressive strength of concrete, effectively improving the comprehensive performance of concrete.

[0037] like Figure 2 As shown, it is a crusher for crushing desulfurized ash in step S1. The crusher includes a body 1 and a crushing roller 2. The body 1 is hollow inside to form a crushing chamber 3. A feeding port 4 communicating with the crushing chamber 3 is provided on the top of the body 1. A discharge port 5 communicating with the crushing chamber 3 is provided on the bottom of the body 1. The crushing roller 2 is horizontally rotated and connected to the crushing chamber 3. A driving motor 6 for driving the crushing roller 2 to rotate is provided on one side of the body 1. Crushing teeth 7 are provided on the outer wall of the crushing roller 2. Desulfurized ash is fed into the crushing chamber 3 from the feeding port 4 for crushing and is discharged from the discharge port 5 after the crushing is completed. In this embodiment, A filter screen 8 that can move up and down is provided at the port 5, and a driving part that drives the filter screen 8 to vibrate is provided on the body 1. The filter screen 8 can screen the crushed desulfurization ash, and the desulfurization ash less than 120 mesh can be discharged through the filter screen 8. In this way, the crusher can simultaneously realize the crushing and screening of the desulfurization ash, effectively improving the production efficiency without the need for an additional screening machine, and during use, the filter screen 8 is driven by the driving part to vibrate to reduce blockage, so that the filter screen 8 is always in a good working condition, ensuring the continuity of the discharge at the discharge port 5.

[0038] like Figure 2As shown, a mounting plate 9 for installing the drive motor 6 is fixedly provided on one side of the body 1, and a pulley 10 is provided on the output shaft of the drive motor 6 and the end of the crushing roller 2. Power is transmitted between the two pulleys 10 through a belt 11, thereby driving the rotation of the crushing roller 2. In addition, in this embodiment, the internal hollow space of the crushing roller 2 is formed to form a heating channel 12, and the heating channel 12 is used to pass a heating medium, and the heating medium is hot air. In this embodiment, the crushing teeth 7 are made of stainless steel. In this way, during specific use, the hot air in the heating channel 12 is transmitted to the crushing chamber 3 through the crushing teeth 7, achieving a certain heating and drying effect. In this way, even if there is a certain amount of moisture in the desulfurization ash, drying can be achieved synchronously during the crushing process, thereby effectively avoiding the desulfurization ash from adhering to the crushing teeth 7, so that the crushing teeth 7 can continue to maintain a good crushing state.

[0039] like Figure 2 As shown, a heating device 13 is provided on one side of the body 1. The heating device 13 is used to supply heat to the heating channel 12. The heating device 13 is heated by an electric heating wire. One side of the heating device 13 is provided with an air inlet pipe 14 connected to the heating channel 12. The end of the crushing roller 2 away from the air inlet pipe 14 is provided with an air return pipe 15 connected to the heating device 13. In this way, the circulation of hot air can be realized, thereby effectively improving the heating performance, so that the crushing roller 2 and the crushing teeth 7 are always in a good heating state.

[0040] like Figure 2 As shown, an exhaust port 16 communicating with the crushing chamber 3 is provided on the side wall of the machine body 1, and an exhaust fan 17 is provided at the exhaust port 16. At the same time, an exhaust pipe 18 connected to the exhaust port 16 is provided on the outer wall of the machine body 1. The end of the exhaust pipe 18 away from the exhaust port 16 is connected to the heating device 13. In this way, as the heating medium continuously heats the crushing chamber 3, the temperature in the crushing chamber 3 will continue to rise. In order to avoid the situation where the temperature in the crushing chamber 3 is too high, the exhaust fan 17 can be turned on to extract the hot air in the crushing chamber 3 and circulate it into the heating device 13 through the exhaust pipe 18. On the one hand, heat recovery and utilization are realized, energy waste is reduced, and energy saving is achieved. On the other hand, The surface can also effectively prevent the temperature in the crushing chamber 3 from being too high. In practice, a temperature sensor is arranged in the crushing chamber 3, and the exhaust fan 17 is controlled by the controller to realize opening and closing. When the temperature in the crushing chamber 3 is too high, the temperature sensor sends a signal to the controller, and the controller controls the exhaust fan 17 to turn on, so as to realize automatic discharge and cooling of the crushing chamber 3; in addition, a filter 19 is arranged on the exhaust pipe 18, and the filter 19 has a filter element for filtering, so as to ensure that the hot air flowing back into the heating device 13 is clean, and prevent impurities from entering the heating device 13 and the subsequent heating channel 12. The exhaust pipe 18, the air inlet pipe 14 and the return air pipe 15 in this embodiment are all hoses.

[0041] like Figure 2As shown, the crushing roller 2 is connected to the machine body 1 in a horizontal sliding manner along its axial direction. An expansion block 20 is provided at one end of the crushing roller 2 to drive it to move. One side of the expansion block 20 abuts the crushing roller 2, and the other side is fixed to the inner wall of the crushing chamber 3. The expansion block 20 expands when heated, driving the crushing roller 2 to move. An elastic return member 21 is provided at the other end of the crushing roller 2 to drive it to move and reset. The elastic return member 21 is arranged on the outside of the machine body 1. The elastic return member 21 is made of a rubber block. A mounting block 22 for fixing the rubber block is provided on the outside of the machine body 1. The elastic return member 21 abuts one end of the crushing roller 2. In this way, during actual operation, as the temperature in the crushing chamber 3 continues to change, the expansion block 20 is heated to different degrees, thereby driving the crushing roller 2 to move axially to achieve crushing in different areas and achieve a more comprehensive crushing effect. After the temperature in the crushing chamber 3 drops, the expansion block 20 contracts, and the crushing roller 2 moves and resets under the action of the elastic return member 21, realizing horizontal axial reciprocating movement of the crushing roller 2, achieving a more good and comprehensive crushing purpose.

[0042] like Figure 2 and Figure 3 As shown, the driving member includes a push rod 23 vertically slidably connected to the body 1. The push rod 23 is symmetrically arranged and located below the filter screen 8. The air inlet pipe 14 is located below the push rod 23. The bottom end of the push rod 23 penetrates into the air inlet pipe 14. At the same time, an impeller 24 is rotatably connected in the air inlet pipe 14. The center of the impeller 24 has a central axis 25. A cam 26 is fixed on the central axis 25 to abut against the push rod 23. When hot air flows in the air inlet pipe 14, it drives the impeller 24 to rotate, and then the push rod 23 can be driven upward with the help of the cam 26, and finally the push rod 23 is driven to move up and down, thereby realizing the vibration of the filter screen 8. No additional power source is required during the process, which can save energy and reduce costs.

[0043] like Figure 2 As shown, in this embodiment, two crushing rollers 2 are arranged at intervals, and the two crushing rollers 2 can be driven by sprockets and chains, and the crushing teeth 7 on adjacent crushing rollers 2 are staggered. In addition, a lifting bucket 27 is provided on the crushing roller 2, and the lifting bucket 27 and the crushing teeth 7 are alternately arranged along the axial direction of the crushing roller 2. Through the setting of the lifting bucket 27, during the rotation of the crushing roller 2, the lifting bucket 27 can lift the desulfurization ash at the bottom of the crushing chamber 3 to the top and then fall down. The desulfurization ash at the bottom that has not passed through the filter screen 8 can be directly crushed for the second time in the crushing chamber 3, further improving the crushing efficiency and crushing effect.

[0044] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A preparation process for early-strength desulfurized ash-based concrete, characterized in that: The following steps are involved: S1, crushing and screening the desulfurization ash; S2, mixing the sieved desulfurization ash with alkaline admixture and water, and then performing aging treatment to obtain pretreated desulfurization ash; S3, mixing the pretreated desulfurized ash, slag powder, admixture and alkaline additive and grinding them to obtain a gelling material; S4, mixing the cementitious material with sand, coarse aggregate and mixing water and stirring to obtain desulfurized ash-based concrete; In S1, a crusher is used to crush desulfurized ash. The crusher comprises a body (1), a crushing chamber (3) is provided inside the body (1), a crushing roller (2) is rotatably connected in the crushing chamber (3), the crushing roller (2) has crushing teeth (7) for crushing desulfurized ash, a feeding port (4) is provided at the top of the body (1) and is communicated with the crushing chamber (3), a discharge port (5) is provided at the bottom of the body (1), the crushing roller (2) is hollow and forms a heating channel (12), and a heating medium is passed through the heating channel (12); The discharge port (5) is provided with a filter screen (8), and the body (1) is provided with a driving member for driving the filter screen (8) to vibrate at a position corresponding to the filter screen (8); One side of the machine body (1) is provided with an exhaust port (16) in communication with the crushing chamber (3); an exhaust fan (17) is provided at the exhaust port (16); an exhaust pipe (18) connected thereto is provided at the exhaust port (16); an end of the exhaust pipe (18) away from the exhaust port (16) is connected to the heating device (13); the heating device (13) is provided with an air inlet pipe (14) in communication with the heating channel (12); a filter (19) is provided on the exhaust pipe (18); a filter element is provided in the filter (19); The driving member comprises a push rod (23) vertically slidably connected to the body (1); an impeller (24) is rotatably connected to the push rod (23) in the air inlet pipe (14); the impeller (24) has a central axis (25); a cam (26) is fixedly provided on the central axis (25) for contacting the push rod (23) and pushing it upward; The crushing roller (2) is connected to the machine body (1) in an axially horizontal sliding manner. An expansion block (20) is provided in the crushing chamber (3) at one end corresponding to the crushing roller (2) for driving the crushing roller to move. The expansion block (20) abuts against one end of the crushing roller (2). An elastic reset member (21) is provided at one end of the crushing roller (2) away from the expansion block (20). The elastic reset member (21) abuts against the end of the crushing roller (2).

2. The process for preparing an early-strength desulfurized ash-based concrete according to claim 1, wherein: The alkaline admixture and alkaline additive both include quicklime, and the admixture includes melamine-based water reducer and fatty acid polyethylene glycol ester.

3. The process for preparing an early-strength desulfurized ash-based concrete according to claim 1, wherein: The outer wall of the crushing roller (2) is also fixedly provided with a lifting bucket (27). When the crushing roller (2) rotates, the lifting bucket (27) lifts the desulfurized ash at the bottom of the crushing cavity (3) to above the crushing roller (2).

4. The process for preparing an early-strength desulfurized ash-based concrete according to claim 3, characterized in that: The lifting buckets (27) and the crushing teeth (7) are alternately arranged along the axial direction.

5. The process for preparing an early-strength desulfurized ash-based concrete according to claim 1, characterized in that: Two crushing rollers (2) are arranged horizontally at intervals, and the crushing teeth (7) on adjacent crushing rollers (2) are arranged in staggered positions.

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