Microbial mineralization treatment equipment for all-recycled concrete aggregate

Abstract

The utility model discloses full-recycled concrete aggregate microorganism mineralization treatment equipment, which belongs to the technical field of building material processing equipment and comprises a crushing and screening unit, the discharge end of the crushing and screening unit is connected with the feed end of a calcining bin, the discharge end of the calcining bin is connected with the feed end of a microorganism mineralization reaction tower, and the discharge end of the microorganism mineralization reaction tower is connected with the discharge end of a water tank. The discharging end of the microorganism mineralization reaction tower is connected with the feeding end of the waste liquid recovery tank, the liquid outlet end of the waste liquid recovery tank is connected with the liquid inlet end of the purification tank, and the liquid outlet end of the purification tank is connected with the liquid inlet end of the microorganism mineralization reaction tower through the centrifugal pump. According to the utility model, through modular design and intelligent control, the integrated treatment from crushing, calcining to microbial mineralization is realized, and the environmental problem and the energy consumption problem of the traditional modification equipment are effectively solved.

Description

Technical Field

[0001] This utility model belongs to the technical field of building material processing equipment, and in particular relates to a microbial mineralization treatment equipment for fully recycled concrete aggregate. Background Technology

[0002] Recycled aggregates, as an important means of resource utilization of construction waste, can effectively alleviate the shortage of natural aggregate resources and reduce the environmental pollution caused by construction waste. However, due to the crushing and screening processes during production, recycled aggregates have a large amount of cement mortar adhering to their surface, resulting in significant performance disadvantages compared to natural aggregates. These disadvantages include higher water absorption, higher crushing index, and higher porosity, which limit their application in concrete. Current technological limitations include the fact that traditional recycled aggregate modification equipment typically relies on chemical impregnation tanks for surface treatment, which poses significant environmental problems; the high-temperature calcination process in high-temperature calcination furnaces consumes extremely high energy, increasing production costs and exacerbating energy consumption and carbon emissions. Furthermore, there is a lack of dedicated closed-loop microbial mineralization treatment equipment for recycled aggregates. Existing equipment is mostly single-function and cannot achieve integrated treatment from crushing and calcination to bacterial liquid circulation, mineralization reaction, and waste liquid recovery. This technological gap restricts the further development and application of recycled aggregate modification technology. Utility Model Content

[0003] The purpose of this invention is to provide a fully enclosed, continuous operation microbial mineralization treatment equipment for recycled aggregates. Through modular design, it achieves full automation of the aggregate crushing-pretreatment-microbial mineralization-waste liquid recovery process, ensuring zero pollution emissions.

[0004] To achieve the above-mentioned objectives, the technical solution adopted by this utility model is as follows:

[0005] A fully recycled concrete aggregate microbial mineralization treatment device includes: a crushing and screening unit, the discharge end of which is connected to the inlet end of a calcination bin, the discharge end of which is connected to the inlet end of a microbial mineralization reaction tower, the discharge end of which is connected to the inlet end of a waste liquid recovery tank, the discharge end of which is connected to the inlet end of a purification tank, and the discharge end of which is connected to the inlet end of the microbial mineralization reaction tower via a centrifugal pump.

[0006] Furthermore, the crushing and screening unit includes a jaw crusher, the discharge end of which is connected to the feed end of the vibrating screen, and the discharge end of the vibrating screen is connected to the feed end of the calcining bin.

[0007] Furthermore, the microbial mineralization reaction tower is a vertical multi-layer structure with porous turning plates between layers, and each layer is equipped with a bacterial liquid circulation spray system, a temperature sensor, and a humidity sensor.

[0008] Furthermore, the bacterial liquid circulation spraying system adopts one of the following: a ring spray pipe, a rotary spray head, or an ultrasonic atomizer.

[0009] Furthermore, the waste liquid recovery tank is equipped with a filter screen inside, which is used to filter solid particles in the waste liquid.

[0010] Furthermore, the purification tank is filled with urea / CaCl2.

[0011] Furthermore, the aggregate is conveyed sequentially through a crushing and screening unit, a calcination chamber, and a microbial mineralization reaction tower via a screw conveyor.

[0012] The microbial mineralization treatment equipment for fully recycled concrete aggregates provided by this utility model has the following advantages compared with the prior art:

[0013] This invention achieves integrated processing from crushing and calcination to microbial mineralization through modular design and intelligent control, effectively solving the environmental and energy consumption problems of traditional modification equipment. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the microbial mineralization reaction tower of this utility model;

[0017] Figure 3 This is a schematic diagram showing the circulation relationship between the microbial mineralization reaction tower, waste liquid recovery tank, and purification tank of this utility model.

[0018] In the diagram: 1-calcination chamber, 2-microbial mineralization reaction tower, 3-waste liquid recovery tank, 4-purification tank, 5-jaw crusher, 6-vibrating screen, 7-bacterial liquid circulation spray system. Detailed Implementation

[0019] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments:

[0020] Example 1

[0021] refer to Figure 1-3As shown, this utility model provides a microbial mineralization treatment device for fully recycled concrete aggregate, comprising: a crushing and screening unit, the discharge end of which is connected to the inlet end of a calcination chamber 1; the discharge end of the calcination chamber 1 is connected to the inlet end of a microbial mineralization reaction tower 2; the discharge end of the microbial mineralization reaction tower 2 is connected to the inlet end of a waste liquid recovery tank 3; the discharge end of the waste liquid recovery tank 3 is connected to the inlet end of a purification tank 4; and the discharge end of the purification tank 4 is connected to the inlet end of the microbial mineralization reaction tower 2 via a centrifugal pump. The calcination chamber 1 uses an electrically heated rotary kiln for calcination pretreatment of the recycled aggregate, with an adjustable temperature range of 200-400℃ and a residence time of 0.5-2 hours. The calcination process effectively removes cement mortar from the surface of the aggregate, improving its physical properties.

[0022] In a preferred embodiment, the crushing and screening unit includes a jaw crusher 5, the discharge end of which is connected to the feed end of a vibrating screen 6, and the discharge end of the vibrating screen 6 is connected to the feed end of a calcination bin 1. The jaw crusher 5 is used to crush construction waste into recycled aggregate with a particle size of 5-20mm. The jaw crusher 5 has high crushing efficiency and stability and can handle construction waste of varying hardness. The vibrating screen 6 is used to screen the crushed aggregate to ensure uniform aggregate particle size, meeting the requirements for subsequent processing.

[0023] In a preferred embodiment, the microbial mineralization reaction tower 2 is a vertical multi-layer structure with porous tipping plates between the layers. These plates automatically tip over as the aggregate falls, ensuring uniform mineralization. The porous tipping plate design prevents aggregate accumulation and improves the mineralization effect.

[0024] Each layer is equipped with a bacterial liquid circulation spraying system 7, a temperature sensor, and a humidity sensor. The bacterial liquid circulation spraying system 7 evenly sprays the bacterial liquid onto the aggregate surface, promoting microbial-induced calcium carbonate precipitation and improving aggregate properties. The temperature and humidity control range of the microbial mineralization reaction tower 2 is 35-45℃ and ≥90% to ensure optimal conditions for the microbial mineralization reaction.

[0025] In a preferred embodiment, the bacterial solution circulating spraying system 7 employs one of the following: annular spray pipes, rotary spray heads, or ultrasonic atomizers. Three to five layers of annular spray pipes are installed within the microbial mineralization reaction tower 2, each layer equipped with an atomizing nozzle. The spray particle size is ≤50μm, and the spray pressure is 0.2-0.5MPa. The atomizing nozzles can uniformly spray the bacterial solution onto the aggregate surface, improving the uniformity and efficiency of the mineralization reaction.

[0026] In a preferred embodiment, the waste liquid recovery tank 3 is equipped with a filter screen inside, which is used to filter solid particles in the waste liquid. The purification tank 4 is filled with urea / CaCl2. The filtered and purified waste liquid is pumped back into the bacterial liquid circulation spray system 7 to achieve the recycling of waste liquid.

[0027] In a preferred embodiment, the aggregate is conveyed sequentially through the crushing and screening unit, calcination chamber 1, and microbial mineralization reaction tower 2 via a screw conveyor, ensuring a clean and safe production environment with no dust leakage throughout the process. The bacterial solution circulates through corrosion-resistant pipes, avoiding contact with the external environment and preventing contamination and deterioration.

[0028] As a preferred embodiment, the system also includes: a PLC-programmed intelligent control system capable of real-time adjustment of calcination temperature, bacterial solution spray volume, and reaction time to match different aggregate porosities. The intelligent control system can automatically adjust processing parameters based on the actual condition of the aggregates to ensure optimal modification effects. The system is equipped with temperature, humidity, and pressure sensors to monitor environmental conditions within the microbial mineralization reaction tower 2 in real time, ensuring the reaction process proceeds under optimal conditions. As an alternative, an AI control system replaces PLC programming. The AI ​​control system can automatically optimize processing parameters by learning from historical data, improving the stability and consistency of the modification effect. A remote monitoring system replaces local monitoring, using IoT technology to achieve remote monitoring and fault diagnosis of the equipment, improving equipment maintenance efficiency and ease of use.

[0029] Example 2

[0030] The operation begins with the automated feeding of construction waste. The operator feeds concrete blocks, bricks, and other construction waste into the hopper of jaw crusher 5. The waste undergoes primary crushing in jaw crusher 5 (45kW), reducing the particle size to 5-20mm. The crushed aggregate is then conveyed to vibrating screen 6 via a screw conveyor (3kW). Vibrating screen 6 uses a frequency converter to adjust the screen amplitude (0.5-3mm) to separate the qualified recycled aggregate. Oversized material is automatically returned to jaw crusher 5 for reprocessing through a return channel, forming a closed-loop circulation system. A PLC monitors the load current of vibrating screen 6 in real time and dynamically adjusts the feeding speed of jaw crusher 5 to ensure a stable processing efficiency of 20-30 tons / hour.

[0031] The screened aggregate enters the electrically heated rotary kiln (calcination chamber 1) via a closed screw conveyor. The operator inputs calcination parameters (e.g., temperature 300℃, residence time 1.5 hours) through the HMI. The PLC heats the material in stages according to a preset program to avoid thermal shock. Six sets of nickel-chromium alloy heating tubes inside the rotary kiln feed back the temperature to the PLC via thermocouples (K type, range 0-500℃). The PLC uses a PID algorithm (proportional-integral-derivative control) to adjust the power, with temperature fluctuations ≤ ±10℃. If the temperature exceeds the limit (>400℃), the PLC immediately cuts off the heating power and triggers an audible and visual alarm (buzzer + red warning light).

[0032] The calcined aggregate is fed into the microbial mineralization reaction tower 2 by an elevator. The tower has five layers of annular spray pipes linked to temperature and humidity sensors: when the humidity of the first layer is below 90%, the PLC activates the bacterial solution circulation spray system 7 (pressure 0.3MPa, atomized particle size ≤50μm), and simultaneously turns on the circulating fan to accelerate humidity equalization. As the aggregate falls to each layer, a pneumatic tilting plate rotates the aggregate 120° at a frequency of 5 times / minute to ensure uniform coverage by the bacterial solution. The reaction waste liquid enters a centrifugal pump (power 5.5kW) through a 20μm filter at the bottom, and is recycled through a purification tank 4. The PLC starts and stops the centrifugal pump based on the liquid level sensor signal.

[0033] A single batch processing of 30 tons of construction waste took 7 hours and 15 minutes, producing 27.6 tons of qualified modified aggregate (92% yield), with a comprehensive power consumption of 3.5 kWh / ton. The apparent density of the finished aggregate reached 2580 kg / m³. 3 The crushing index is 8.7%, meeting the C30 concrete mix design requirements. Waste liquid recycling rate is ≥95%, dust collection rate is 99.5%, and emission concentration is ≤10mg / m³. 3 It conforms to the GB16297-1996 standard. All production parameters (such as calcination temperature 268.4℃ and mineralization time 35 minutes) can be traced via barcode. If the finished product qualification rate is below 95%, the system automatically retrieves sensor data from abnormal periods (such as "the humidity of the third layer suddenly drops to 82%)" to assist in diagnosing the root cause of the fault (such as a clogged spray solenoid valve), thus achieving closed-loop optimization of production.

[0034] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0035] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0036] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A full-recycled concrete aggregate microbial mineralization treatment apparatus, characterized by, Comprise: The crushing and screening unit is connected with the feeding end of the calcination bin (1), the discharging end of the calcination bin (1) is connected with the feeding end of the microbial mineralization reaction tower (2), the discharging end of the microbial mineralization reaction tower (2) is connected with the feeding end of the waste liquid recovery tank (3), the discharging end of the waste liquid recovery tank (3) is connected with the liquid inlet end of the purification tank (4), and the liquid outlet end of the purification tank (4) is connected with the liquid inlet end of the microbial mineralization reaction tower (2) through a centrifugal pump.

2. A device for microbial-mineralization treatment of recycled concrete aggregates according to claim 1, characterized in that, The crushing and screening unit comprises a jaw crusher (5), the discharging end of the jaw crusher (5) is connected with the feeding end of a vibrating screen (6), and the discharging end of the vibrating screen (6) is connected with the feeding end of the calcination bin (1).

3. A device for microbial mineralization treatment of recycled concrete aggregates according to claim 1, characterized in that, The microbial mineralization reaction tower (2) is a vertical multi-layer structure, a porous turnover plate is arranged between layers, and a bacteria liquid circulating spraying system (7), a temperature sensor and a humidity sensor are arranged on each layer.

4. A full-recycled concrete aggregate microbial mineralization treatment apparatus according to claim 3, characterized in that, The bacteria liquid circulating spraying system (7) adopts one of a ring-shaped spraying pipe, a rotary spraying head and an ultrasonic atomizer.

5. A device for microbial mineralization treatment of recycled concrete aggregates according to claim 1, characterized in that, The waste liquid recovery tank (3) is internally provided with a filter screen for filtering solid particles in the waste liquid.

6. A full-recycled concrete aggregate microbial mineralization treatment apparatus according to claim 1, characterized in that, The purification tank (4) is filled with urea / CaCl2.

7. A device for microbial mineralization treatment of recycled concrete aggregates according to claim 1, characterized in that, The aggregate is sequentially conveyed through the crushing and screening unit, the calcination bin (1) and the microbial mineralization reaction tower (2) by a spiral conveyor.

Images