CN-117563738-B - Continuous industrialized recycling system and method for full-component aggregate of waste concrete

CN117563738BCN 117563738 BCN117563738 BCN 117563738BCN-117563738-B

Abstract

The invention discloses a full-component aggregate continuous industrialized recovery system and method for waste concrete, the system comprises a reaction container, a flat discharge electrode, a screen group, a powder collecting container and a side aggregate collecting container. The screen group comprises a plurality of screens which are arranged in parallel from top to bottom, and the screens can be switched into a high-voltage pulse source or ground so as to form a high-voltage electrode or a grounding electrode. When waste concrete is recovered, electrode properties of adjacent screen layers in the screen groups are sequentially changed, so that a pulse discharge loop is formed between the adjacent screen layers, particles on a lower screen layer in the adjacent screen layers are crushed, separated aggregates with different particle diameters are input into an aggregate collecting container, crushed fine powder enters the powder collecting container through a fourth screen, the phenomenon of excessive crushing caused by secondary crushing of dissociated recycled aggregates is avoided, the original size and apparent form of the aggregates are ensured, continuous industrial recycling of the waste concrete is realized, and energy consumption is reduced.

Inventors

HE MENGBING
Dong Luokang
HUANG WEI
FENG BINGYANG
FU YINGJIE
QIN SHENYI

Assignees

华中科技大学

Dates

Publication Date: 20260508
Application Date: 20231017

Claims (6)

1. A full-component aggregate continuous industrial recycling system of waste concrete is characterized by comprising: A reaction vessel (1); A flat discharge electrode (2) provided in the reaction vessel (1); The device comprises a flat discharge electrode (2), a screen group, a sliding electrode seat (12), a control switch and a circuit breaker, wherein the screen group is arranged at the bottom of the flat discharge electrode (2) and is parallel to the flat discharge electrode (2), the screen group comprises a plurality of screens which are arranged in parallel from top to bottom, the pore diameters of the plurality of screens are sequentially reduced from top to bottom, the outer side of the screen group is sealed through the square tube, the bottom of the square tube is fixedly connected with the inner wall surface of a reaction vessel (1), the surface of the square tube is subjected to insulation treatment, one end of the inner wall surface is provided with a sliding groove, a plurality of discharge holes (11) are formed in the sliding groove according to the positions of the screens of each layer, one end of the screen is hinged with the fixed electrode seat (6), the other end of the screen is hinged with the sliding electrode seat (12), the outer side of the fixed electrode seat (6) is fixedly connected with the inner wall surface of the square tube, the sliding electrode seat (12) slides up and down along the sliding groove and seals the discharge holes (11), and the screens are controlled by the control switch and the circuit breaker to switch between a high-voltage pulse source and the ground; a powder collecting container (9) and a side aggregate collecting container (14) which are positioned at the bottom of the screen group; The method comprises the steps of injecting water into a reaction container (1) to enable water to soak a flat discharge electrode (2), inputting concrete particles with corresponding quantity to be placed on a top screen of a screen group, forming a grounding electrode by conducting the top screen with the ground, inputting a corresponding high-voltage pulse source to form a high-voltage electrode by the flat discharge electrode (2) through a high-voltage pulse generator, conducting high-voltage pulse discharge treatment on the concrete particles on the top screen, enabling the crushed concrete particles to fall into a next screen after crushing, tilting the top screen after completing discharge operation for a set time, enabling large particle impurities to fall into an aggregate collecting container (14), enabling the voltage of the high-voltage pulse source to be 80-160kV, enabling pulse frequency to be 1-5 Hz, enabling a pulse discharge loop between adjacent screen layers to adjust parameters and electrode spacing of input high-voltage pulse sources according to particle sizes of the particles to be crushed, enabling the pulse discharge loop between the adjacent screen layers to sequentially change electrode properties of the adjacent screen layers, enabling the adjacent layers to form pulse discharge loops, enabling the lower screen particles in the adjacent layers to sequentially fall into the next screen, enabling the particles to fall into the aggregate collecting container (14), enabling the particles to fall into the powder collecting container (9) through the powder particles of the bottom screen, and the powder collecting container, wherein the particles fall into the powder collecting container after the particles fall into the bottom screen container.
2. The full-component aggregate continuous industrialized recovery system of waste concrete according to claim 1, wherein the screen group comprises a first screen (5), a second screen (13), a third screen (7) and a fourth screen (8) which are sequentially arranged from top to bottom, the pore diameter of the first screen (5) is selected according to the maximum particle size of the concrete aggregate, the pore diameter of the second screen (13) is 1/2-1/3 of the pore diameter of the first screen (5), the pore diameter of the third screen (7) is 4.75mm, and the pore diameter of the fourth screen (8) is 0.15mm.
3. The continuous industrialized recycling system for the full-component aggregate of the waste concrete according to claim 1, wherein a feed port and a water injection port are formed in the top of the reaction container (1), a feed mechanism (4) is used for inputting required quantity of waste concrete particles into the reaction container (1) through the feed port and placing the waste concrete particles on a screen group, and water is injected into the corresponding quantity of the waste concrete particles through the water injection port, so that the flat discharge electrode (2) is submerged.
4. The continuous industrialized recycling system for the full-component aggregate of the waste concrete, which is disclosed in claim 3, is characterized in that a water level observation hole is formed in the reaction container (1), a liquid level sensor is arranged in the reaction container (1), the liquid level sensor detects the height of the water level in the reaction container (1), and a water pump is controlled to inject corresponding amount of water into the reaction container (1) through a water injection hole.
5. The full-component aggregate continuous industrial recycling system of the waste concrete according to claim 1, wherein a first discharging mechanism (10) and a second discharging mechanism (15) are communicated with the bottom of the reaction container (1); The first discharging mechanism (10) comprises a first sediment pump which is communicated with a powder collecting container (9) in the reaction container (1) through a pipeline; the second discharging mechanism (15) comprises a second sediment pump which is communicated with the aggregate collecting container (14) in the reaction container (1) through a pipeline.
6. A method for continuously and industrially recycling the full-component aggregate of the waste concrete, which is realized by the continuous and industrialized recycling system of the full-component aggregate of the waste concrete according to any one of claims 1 to 5, and is characterized by comprising the following steps: s100, setting related parameters according to the self properties of the waste concrete particles, wherein the related parameters comprise voltage, discharge frequency and discharge time parameters of a plurality of groups of high-voltage pulse sources set according to the concrete particles with different particle diameters; S200, injecting a corresponding amount of water into the reaction container (1) to enable the water to submerge the flat discharge electrode (2); S300, inputting a certain amount of waste concrete particles into a reaction container (1) and placing the waste concrete particles on a top screen of a screen group; S400, connecting a flat discharge electrode (2) to a corresponding high-voltage pulse source to form a high-voltage electrode, grounding a top screen to form a grounding electrode, so as to form a pulse discharge loop, crushing concrete particles on the top screen according to a set time length, disconnecting the high-voltage pulse source and the ground after the completion of the crushing, pouring the residual impurities on the top screen into a bone material collecting container (14), and enabling the crushed particles to fall onto a lower screen; S500, connecting a top screen into a corresponding high-voltage pulse source to form a high-voltage electrode, grounding a lower screen to form a grounding electrode, so as to form a pulse discharge loop, crushing concrete particles on the lower screen according to a set time length, disconnecting the high-voltage pulse source and the ground after the concrete particles are crushed, pouring aggregates separated from the lower screen into a bone material collecting container (14), and enabling the crushed particles to fall on the lower screen; s600, sequentially changing electrode properties of adjacent screen layers in the screen group, forming a pulse discharge loop between the adjacent screen layers, crushing particles on a lower screen layer in the adjacent screen layers, inputting separated aggregates with different particle diameters into an aggregate collecting container (14) through a discharge hole, and enabling crushed fine powder to enter a powder collecting container (9) through a bottommost screen; s700, repeating the steps S200-S600 after the crushing and collecting work of the concrete particles on the bottommost screen is completed, and carrying out the next round of crushing work; S800, screening particles in an aggregate collecting container (14) to obtain aggregates with different particle sizes, screening again, classifying and recycling, and directly recycling products in a powder collecting container (9).

Description

Continuous industrialized recycling system and method for full-component aggregate of waste concrete Technical Field The invention belongs to the technical field of concrete recovery, and particularly relates to a full-component aggregate continuous industrial recovery system and method for waste concrete. Background At present, the economy is rapidly developed, and urban public and civil buildings and municipal facilities are being updated and reformed in large quantities. The development and construction volume is huge, and the construction waste such as waste concrete is increased year by year due to the demolition and reconstruction of old concrete buildings and engineering structures while consuming a large amount of resources such as sand stone, cement and the like. Along with the scarcity of land resources, the disposal mode of construction waste is changed from the prior urban landfill to water transportation transfer, comprehensive utilization, engineering backfilling, fixed landfill and the like. With the continuous development of cities, on one hand, the environmental problems caused by building rubbish are more and more serious, and on the other hand, the continuous use of concrete raw materials mainly comprises clay, stone, sand, coal and the like, and a large amount of mineral resources are consumed, so that the environment is influenced. Therefore, the recycling of the waste concrete is an important measure for saving energy and resources, protecting the living environment of human beings and running a sustainable development road. Compared with natural aggregate, the recycled coarse aggregate obtained by crushing waste concrete by traditional machinery is easy to adhere and wrap by cement mortar, so that compared with the natural aggregate, the recycled aggregate has high water absorption rate, low apparent density and poor compression resistance, the concrete mixture prepared by adopting the recycled aggregate has poor workability, the hardened body has low strength and large deformation, and the durability of the concrete is poor, so that the recycling of the recycled aggregate is seriously hindered. In addition, the traditional mechanical crushing method is used for crushing concrete particles in a mode of mainly extruding, shearing and grinding, so that aggregate is easy to excessively crush, large dust and noise are generated, and harm is caused to the surrounding environment and personnel. The means and the method have higher cost and limit the popularization and the application. The method has the advantages that the method utilizes high-voltage electric pulse to recycle and treat the waste concrete, utilizes the shock wave generated by the electric pulse to crush the solid, can completely preserve the structural form of the aggregate in the waste concrete, has the advantages of low energy consumption, low cost, no pollution to the environment and the like, and can not achieve the required crushing and recycling effects of the aggregate aiming at the phenomenon that the surface layer discharge parameters and the discharge operation time are inconsistent when the aggregate with different particle sizes is combined with the cement paste and the crushing operation is performed by utilizing the high-voltage electric pulse, for example, the phenomenon that part of the aggregate is excessively crushed and part of the aggregate is not separated from the cement paste is caused by uniform crushing operation. Disclosure of Invention Aiming at the phenomena that the concrete recovery in the prior art can cause that part of aggregate is crushed excessively and part of aggregate is not separated from cement paste, the invention provides a full-component aggregate continuous industrialized recovery system for waste concrete to solve the problems. The invention provides a full-component continuous industrialized recycling system of waste concrete, which comprises a reaction container, a flat discharge electrode, a screen group, a powder collecting container and a side aggregate collecting container, wherein the flat discharge electrode is arranged in the reaction container, the screen group is arranged at the bottom of the flat discharge electrode and is parallel to the flat discharge electrode, the screen group comprises a plurality of screens which are arranged in parallel from top to bottom, the pore diameters of the screens are sequentially reduced from top to bottom, the powder collecting container and the side aggregate collecting container are arranged at the bottom of the screen group, a corresponding amount of concrete particles are input to the powder collecting container, the top screen is conducted with ground to form a grounding electrode, the flat discharge electrode is input to a corresponding high-voltage pulse source through a high-voltage pulse generator to form a high-voltage electrode, so that the concrete particles on the top screen are subjected to high-voltage pulse discharge