Artificial granite manufacturing method based on construction waste

Abstract

The invention belongs to the technical field of building material recycling, and discloses a construction waste-based artificial granite manufacturing method, which comprises the following steps: S1, garbage collection, S2, solid waste three-stage crushing, S3, high-pressure water washing and screening, S4, water washing and air drying, S5, weighing and batching, S6, forced mixing and stirring, S7, semi-finished product compression molding, S8, stone maintenance, S9, finished stone finish machining, and S10, stacking and selling. The artificial granite is manufactured by adopting the construction waste, is environment-friendly and economical, can solve the problem of construction waste accumulation, reduces land occupation and environmental pollution, is weather-resistant, wear-resistant and long in service life, reduces the maintenance cost, has good plasticity, is convenient to construct and install, and most importantly, realizes resource recycling, and is beneficial to environmental protection. The method meets the concept of sustainable development, reduces dependence on natural resources, saves cost for enterprises, improves economic benefits and social benefits, provides novel materials for the building industry, and promotes the sustainable development of cities.

Description

Technical Field

[0001] The invention belongs to the technical field of building material recycling, and specifically relates to a method for producing artificial granite based on construction waste. Background Art

[0002] Artificial granite can be dyed and patterned to produce a variety of colors and patterns, and has a strong decorative effect. The color and pattern of natural granite are determined by its own mineral composition, and usually present a natural and beautiful appearance. Artificial granite is a synthetic decorative stone that is similar in appearance and performance to natural granite. It is made of natural marble fragments and stone powder as the main raw materials, with mosaics, shells, glass and other materials added as embellishments, and organic resin as a binder. It is made through vacuum stirring, high-pressure vibration molding, and room temperature curing.

[0003] Construction waste, also known as building waste, refers to waste generated during the demolition or new construction of buildings. Due to the accelerated urbanization process and the continuous expansion of infrastructure construction, the amount of construction waste generated has also increased year by year. If not properly handled, it will not only occupy a large amount of land resources, but also pollute the environment. At present, in the construction of dilapidated house renovation projects, dilapidated houses need to be demolished, and the construction solid waste after demolition is the raw material for the production of artificial granite. Therefore, using construction waste as the raw material for the production of artificial granite can not only achieve the effect of waste utilization of waste solid materials, but also save the cost of producing granite. Therefore, a method for making artificial granite based on construction waste is introduced. Summary of the invention

[0004] The object of the present invention is to provide a method for producing artificial granite based on construction waste to solve the problems raised in the above background technology.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solution: a method for producing artificial granite based on construction waste, the steps of the method are as follows:

[0006] S1, garbage collection, using not limited to a single collection method, to centrally collect solid waste from building renovation and demolition;

[0007] S2, solid waste tertiary crushing, first use jaw crusher to coarse crushing to less than 180mm, then use magnetic separation system to remove iron, and then use impact crusher to crush to less than 40mm, before the third fine crushing, use magnetic separation system to remove iron again, and finally use cone crusher to crush to less than 5mm;

[0008] S3, high-pressure water washing and screening, using a double-layer vibrating screen with a mesh size of 2cm / 0.7cm to screen the crushed solid waste. During screening, multiple rows of high-pressure water guns with a water pressure of ≥3MPa are simultaneously opened for washing. The screening particle size specifications need to meet three specifications: greater than 5mm, 1-5mm, 1mm and less than 1mm;

[0009] S4, washing and air drying, using a wheel sand washer with a rotation speed of 28r / min, the two kinds of particles after screening are respectively put into the wheel sand washer for continuous water washing to remove soil impurities, and then dried in a dryer to obtain the raw materials of artificial granite;

[0010] S5, weighing ingredients, feeding 1-5 mm aggregate body, 1 mm and less sand making raw materials, recycled steel fiber, composite wood powder, nano silicon dioxide, polycarboxylic acid water reducer, quartz sand, cement, styrene-butadiene latex, chloroprene latex, citric acid, cellulose, and magnesium fluorosilicate into a mixer according to a certain proportion;

[0011] S6, forced mixing and stirring, the ingredients fed in are powered on in advance for dry stirring for two minutes, and then water is added, stirring while adding, and after a certain amount of water is added, stirring is continued for three minutes before discharging;

[0012] S7, semi-finished product pressing and molding, the stirred wet material is transported to a molding machine through a conveyor belt for pressing and molding, and a pulse pressurization mode is adopted to obtain an artificial granite semi-finished stone;

[0013] S8, stone curing, adopts a step-by-step curing method, transports the semi-finished stone to the curing room for 12 hours of steam curing, which is divided into three stages. The first stage is neat curing at 50℃ for 2 hours, the second stage adjusts the temperature to 75℃ and lasts for 6 hours, and the third stage takes the stone out and places it in a ventilated environment. It can be produced after natural cooling for 4 hours;

[0014] S9, finished stone finishing, using grinding and polishing devices to finish the semi-finished stone after curing, and obtain finished artificial granite stone after processing;

[0015] S10, stacking and sales, uses a non-contact ultrasonic detector to detect the finished artificial granite stones after fine processing, scans the internal defects of each batch of products, and automatically sorts out unqualified products; then a palletizer is used for stacking and storage to facilitate later transportation and sales.

[0016] Preferably, the formula of artificial granite stone is distributed in proportion: 30% of 1-5 mm aggregate body, 10% of sand making raw materials of 1 mm and less, 1.2% of recycled steel fiber, 0.8% of composite wood powder, 0.5% of nano silicon dioxide, 0.3% of polycarboxylic acid water reducer, 8% of quartz sand, 18% of cement, 0.8% of styrene-butadiene latex, 0.5% of chloroprene latex, 0.6% of citric acid, 0.4% of cellulose, 0.7% of magnesium fluorosilicate, and an appropriate amount of water.

[0017] Preferably, the garbage collection method is specifically divided into four methods:

[0018] Forklift collection: Use a forklift to shovel construction waste into designated collection containers;

[0019] Broom cleaning: Use a broom to clean small particles and dust from the ground and collect them into designated containers;

[0020] Manual handling: Use carts and handling tools to carry construction waste to designated collection locations;

[0021] Intelligent sorting system: Through X-ray sorting + AI visual recognition, light materials such as wood and plastic are automatically separated to reduce the subsequent washing load.

[0022] Preferably, the feeding method is specifically: using a vibrating feeder, setting the vibrating feeder in front of the crusher, making the material move forward evenly through vibration and slowly enter the crusher; or using an intermittent feeding method, so that each feeding interval is 2 seconds.

[0023] Preferably, the jaw crusher used for the S2 primary crushing should idle for 1 to 2 minutes after starting up. After confirming that it is running normally, pour the construction waste into the silo, and continuously and evenly input the construction waste into the construction waste crusher through the vibrating feeder for the first crushing, so as to achieve complete separation of the concrete blocks and steel bars of the construction and decoration waste.

[0024] Preferably, the water washing and air drying in S4 is used together with a grit chamber, and the sedimentation time of the grit chamber needs to be ≥2h.

[0025] Preferably, the specific steps of finishing the finished stone are:

[0026] C1, Preparation: Check and confirm the quantity and quality of semi-finished stone, and prepare the required grinding, polishing equipment and tools;

[0027] C2, coarse grinding: Use the coarse grinding device to grind the stone surface preliminarily, remove the rough part of the surface, and make the surface smoother;

[0028] C3, fine grinding: on the basis of rough grinding, use fine grinding device to further grind the stone surface, refine the surface and make it smoother;

[0029] C4, Polishing: Polishing is the last process to make the stone surface brighter. Polishing equipment and polishing materials are used to polish the stone surface to a mirror effect.

[0030] C5, Inspection: After polishing, the stone is inspected to see if the surface is smooth and flawless, and if the color and texture meet the requirements;

[0031] C6, Recording and Reporting: Finally, record the relevant data and results of the entire finishing process and generate necessary reports.

[0032] Preferably, in said S6, during the forced mixing and stirring, a microwave moisture content detector and an infrared temperature sensor with an accuracy of ±0.5% are installed in the stirring kettle, and the amount of water added is adjusted in real time to maintain the water-to-binder ratio accurately to 0.32±0.02.

[0033] Preferably, in S7, the pulse pressurization mode in the semi-finished product press molding adopts a pressure of 0-50 MPa, is cycled 3 times, and the holding time for each time is at least 30 seconds.

[0034] The beneficial effects of the present invention are as follows:

[0035] 1. The present invention can bring many benefits by using construction waste as artificial granite. First, this helps to solve the problem of construction waste accumulation and convert it into valuable products, thereby reducing the occupation of land resources and environmental pollution. Secondly, artificial granite has a rich selection of colors and textures, which can meet diverse decorative needs and provide more creative space for architectural design. In addition, due to its good weather resistance and wear resistance, artificial granite has a long service life, reducing maintenance costs and resource waste. At the same time, this material also has good plasticity and can be cut, polished and processed as needed, which is convenient for construction and installation.

[0036] 2. The present invention further improves the performance of artificial granite by integrating innovative technologies such as intelligent sorting, multi-stage crushing, and steel fiber reinforcement. The application of these technologies enables the product's compressive strength to reach the C60 standard (65MPa), which is 62% higher than the original solution, greatly enhancing the stability and durability of the material. At the same time, these innovative technologies also achieve a comprehensive utilization rate of construction waste of ≥95%, further improving the recycling and utilization efficiency of resources.

[0037] 3. The present invention uses construction waste as the raw material of artificial granite, realizes the recycling of resources, and conforms to the concept of sustainable development. This not only reduces the dependence on natural resources, but also saves production costs for enterprises and improves economic and social benefits. In summary, the benefits of using construction waste as artificial granite are environmental protection, sustainability, economy, diversity, plasticity and high performance. It not only provides a new type of building material for the construction industry, but also helps promote the sustainable development of cities and build a resource-saving and environmentally friendly society. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a flow chart of the method for making artificial granite of the present invention;

[0039] Figure 2 It is a diagram of the types of garbage collection methods of the present invention;

[0040] Figure 3 The figure is a flow chart of the finishing steps of the finished stone material of the present invention. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] like Figures 1 to 3 As shown, an embodiment of the present invention provides a method for producing artificial granite based on construction waste, and the steps of the method are as follows:

[0043] S1, garbage collection, using not limited to a single collection method, to centrally collect solid waste from building renovation and demolition;

[0044] S2, three-stage crushing of solid waste, first using a jaw crusher to coarsely crush to less than 180mm, then using a magnetic separation system to remove iron, and then using an impact crusher to crush to less than 40mm. Before the third fine crushing, the magnetic separation system is used to remove iron again, and finally a cone crusher is used to crush to less than 5mm; the iron impurity recovery rate is >95%;

[0045] The qualified construction aggregates are transported to the construction waste crusher through a belt conveyor for the second crushing, so that the large pieces of construction waste aggregates can be crushed to less than 40mm (crushing ratio 80%).

[0046] S3, high-pressure water washing and screening, using a double-layer vibrating screen with a mesh size of 2cm / 0.7cm to screen the crushed solid waste. During screening, multiple rows of high-pressure water guns with a water pressure of ≥3MPa are opened simultaneously for washing, and the screening efficiency is increased by 30%. The screening particle size specifications need to meet three specifications: greater than 5mm, 1-5mm, 1mm and less than 1mm;

[0047] Those larger than 5 mm need to return to step S2 for fine crushing, those between 1 and 5 mm are the main aggregate, and those within 1 mm are the raw materials for sand making;

[0048] S4, washing and air drying, using a wheel sand washer with a rotation speed of 28r / min, the two types of particles after screening are respectively put into the wheel sand washer for continuous water washing to remove soil impurities, and then dried by a dryer to obtain the raw material of artificial granite; the moisture content of the mud is controlled to be ≤15%;

[0049] S5, weighing ingredients, feeding 1-5 mm aggregate body, 1 mm and less sand making raw materials, recycled steel fiber, composite wood powder, nano silicon dioxide, polycarboxylic acid water reducer, quartz sand, cement, styrene-butadiene latex, chloroprene latex, citric acid, cellulose, and magnesium fluorosilicate into a mixer according to a certain proportion;

[0050] S6, forced mixing and stirring, the ingredients fed in are powered on in advance for dry stirring for two minutes, and then water is added, stirring while adding, and after a certain amount of water is added, stirring is continued for three minutes before discharging;

[0051] S7, semi-finished product pressing and molding, the stirred wet material is transported to the molding machine through a conveyor belt for pressing and molding, and the artificial granite semi-finished stone is obtained by pulse pressing mode; the porosity requirement is reduced to 2.3%;

[0052] S8, stone curing, adopts a step curing method, the semi-finished stone is transported to the curing room for 12 hours of steam curing, which is divided into three stages. The first stage is neat curing at 50℃ for 2 hours, the second stage adjusts the temperature to 75℃ and lasts for 6 hours, and the third stage takes out the stone and places it in a ventilated environment. It can be produced after natural cooling for 4 hours; the compressive strength is increased by 25%;

[0053] S9, finished stone finishing, using grinding and polishing devices to finish the semi-finished stone after curing, and obtain finished artificial granite stone after processing;

[0054] S10, stacking and sales, uses a non-contact ultrasonic detector (frequency 1MHz) to detect the finished artificial granite stones after fine processing, scans the internal defects of each batch of products, and automatically sorts out unqualified products; then uses a palletizer for stacking and storage to facilitate later transportation and sales.

[0055] Among them, the formula of artificial granite stone is distributed in proportion: 30% of 1-5 mm aggregate, 10% of sand-making raw materials of 1 mm and less, 1.2% of recycled steel fiber, 0.8% of composite wood powder, 0.5% of nano-silicon dioxide, 0.3% of polycarboxylic acid water reducer, 8% of quartz sand, 18% of cement, 0.8% of styrene-butadiene latex, 0.5% of chloroprene latex, 0.6% of citric acid, 0.4% of cellulose, 0.7% of magnesium fluorosilicate, and an appropriate amount of water.

[0056] The garbage collection method is specifically divided into four methods:

[0057] Forklift collection: Use a forklift to shovel construction waste into designated collection containers;

[0058] Broom cleaning: Use a broom to clean small particles and dust from the ground and collect them into designated containers;

[0059] Manual handling: Use carts and handling tools to carry construction waste to designated collection locations;

[0060] Intelligent sorting system: Through X-ray sorting + AI visual recognition, light materials such as wood and plastic are automatically separated to reduce the subsequent washing load.

[0061] The core components of the X-ray sorting + AI visual recognition system:

[0062] X-ray module: emits dual-energy X-rays to penetrate materials and identify metal, plastic, wood and other components through density differences (with an accuracy of 1mm).

[0063] AI vision module: A high-resolution camera captures the appearance of the material (color, shape), combines it with a deep learning algorithm to analyze the image and identify the type of impurities.

[0064] Sorting actuator: high-pressure gas valve or robotic arm accurately removes impurities (response speed ≤ 0.1 seconds, positioning error < 3mm).

[0065] Workflow:

[0066] Step 1: Material loading: Construction waste is classified by vibrating screen and evenly spread on the conveyor belt.

[0067] Step 2: Synchronous scanning: X-rays and cameras scan simultaneously to generate density maps and appearance images.

[0068] Step 3: AI decision-making: Fusion of two types of data to determine the type of impurities (such as identifying steel bars and plastic films).

[0069] Step 4: High-speed sorting: The air valve instantly ejects impurities (such as metal into the recycling bin, wood into the incineration bin).

[0070] Step 5: Closed-loop optimization: AI automatically optimizes the algorithm based on the sorting results to improve subsequent accuracy.

[0071] The feeding method is specifically as follows: using a vibrating feeder, setting the vibrating feeder in front of the crusher, making the material move forward evenly through vibration and slowly enter the crusher; or using an intermittent feeding method, making each feeding interval 2 seconds.

[0072] Among them, the jaw crusher used in the S2 primary crushing should idle for 1 to 2 minutes after starting up. After confirming that it is running normally, pour the construction waste into the silo, and use the vibrating feeder to continuously and evenly input the construction waste into the construction waste crusher for the first crushing, so as to achieve complete separation of the concrete blocks and steel bars of the construction and decoration waste.

[0073] The water washing and air drying of S4 is used together with a grit chamber, and the sedimentation time of the grit chamber needs to be ≥2h.

[0074] The specific steps of finishing the finished stone are as follows:

[0075] C1, Preparation: Check and confirm the quantity and quality of semi-finished stone, and prepare the required grinding, polishing equipment and tools;

[0076] C2, coarse grinding: Use the coarse grinding device to grind the stone surface preliminarily, remove the rough part of the surface, and make the surface smoother;

[0077] C3, fine grinding: on the basis of rough grinding, use fine grinding device to further grind the stone surface, refine the surface and make it smoother;

[0078] C4, Polishing: Polishing is the last process to make the stone surface brighter. Polishing equipment and polishing materials are used to polish the stone surface to a mirror effect.

[0079] C5, Inspection: After polishing, the stone is inspected to see if the surface is smooth and flawless, and if the color and texture meet the requirements;

[0080] C6, Recording and Reporting: Finally, record the relevant data and results of the entire finishing process and generate necessary reports.

[0081] Among them, in said S6, during the forced mixing and stirring, a microwave moisture content detector and an infrared temperature sensor with an accuracy of ±0.5% are installed in the stirring kettle to adjust the amount of water added in real time to keep the water-to-binder ratio accurate to 0.32±0.02.

[0082] Among them, S7, the pulse pressurization mode in the semi-finished product pressing molding adopts 0-50MPa pressure, cycles 3 times, and the holding time each time is at least 30 seconds.

[0083] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0084] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for producing artificial granite based on construction waste, characterized in that: The manufacturing method steps are: S1, garbage collection, using not limited to a single collection method, to centrally collect solid waste from building renovation and demolition; S2, solid waste tertiary crushing, first use jaw crusher to coarse crushing to less than 180mm, then use magnetic separation system to remove iron, and then use impact crusher to crush to less than 40mm, before the third fine crushing, use magnetic separation system to remove iron again, and finally use cone crusher to crush to less than 5mm; S3, high-pressure water washing and screening, using a double-layer vibrating screen with a mesh size of 2cm / 0.7cm to screen the crushed solid waste. During screening, multiple rows of high-pressure water guns with a water pressure of ≥3MPa are simultaneously opened for washing. The screening particle size specifications need to meet three specifications: greater than 5mm, 1-5mm, 1mm and less than 1mm; S4, washing and air drying, using a wheel sand washer with a rotation speed of 28r / min, the two kinds of particles after screening are respectively put into the wheel sand washer for continuous water washing to remove soil impurities, and then dried in a dryer to obtain the raw materials of artificial granite; S5, weighing ingredients, feeding 1-5 mm aggregate body, 1 mm and less sand making raw materials, recycled steel fiber, composite wood powder, nano silicon dioxide, polycarboxylic acid water reducer, quartz sand, cement, styrene-butadiene latex, chloroprene latex, citric acid, cellulose, and magnesium fluorosilicate into a mixer according to a certain proportion; S6, forced mixing and stirring, the ingredients fed in are powered on in advance for dry stirring for two minutes, and then water is added, stirring while adding, and after a certain amount of water is added, stirring is continued for three minutes before discharging; S7, semi-finished product pressing and molding, the stirred wet material is transported to a molding machine through a conveyor belt for pressing and molding, and a pulse pressurization mode is adopted to obtain an artificial granite semi-finished stone; S8, stone curing, adopts a step-by-step curing method, transports the semi-finished stone to the curing room for 12 hours of steam curing, which is divided into three stages. The first stage is neat curing at 50℃ for 2 hours, the second stage adjusts the temperature to 75℃ and lasts for 6 hours, and the third stage takes the stone out and places it in a ventilated environment. It can be produced after natural cooling for 4 hours; S9, finished stone finishing, using grinding and polishing devices to finish the semi-finished stone after curing, and obtain finished artificial granite stone after processing; S10, stacking and sales, uses a non-contact ultrasonic detector to detect the finished artificial granite stones after fine processing, scans the internal defects of each batch of products, and automatically sorts out unqualified products; then a palletizer is used for stacking and storage to facilitate later transportation and sales.

2. The method for producing artificial granite based on construction waste according to claim 1, characterized in that: The formula of artificial granite stone is distributed in the following proportions: 30% of 1-5 mm aggregate, 10% of sand-making raw materials of 1 mm and less, 1.2% of recycled steel fiber, 0.8% of composite wood powder, 0.5% of nano-silicon dioxide, 0.3% of polycarboxylic acid water reducer, 8% of quartz sand, 18% of cement, 0.8% of styrene-butadiene latex, 0.5% of chloroprene latex, 0.6% of citric acid, 0.4% of cellulose, 0.7% of magnesium fluorosilicate, and an appropriate amount of water.

3. The method for producing artificial granite based on construction waste according to claim 1, characterized in that: The garbage collection method is specifically divided into four methods: Forklift collection: Use a forklift to shovel construction waste into designated collection containers; Broom sweeping: Use a broom to clean small particles and dust on the ground and collect them into designated containers; Manual handling: Use carts and handling tools to carry construction waste to designated collection locations; Intelligent sorting system: Through X-ray sorting + AI visual recognition, light materials such as wood and plastic are automatically separated to reduce the subsequent washing load.

4. The method for producing artificial granite based on construction waste according to claim 1, characterized in that: The feeding method is specifically: using a vibrating feeder, setting the vibrating feeder in front of the crusher, making the material move forward evenly through vibration and slowly enter the crusher; or using an intermittent feeding method, so that each feeding interval is 2 seconds.

5. The method for producing artificial granite based on construction waste according to claim 1, characterized in that: The jaw crusher used in the S2 primary crushing should idle for 1 to 2 minutes after starting up. After confirming that it is running normally, pour the construction waste into the silo, and continuously and evenly input the construction waste into the construction waste crusher through the vibrating feeder for the first crushing, so as to achieve complete separation of the concrete blocks and steel bars of the construction and decoration waste.

6. The method for producing artificial granite based on construction waste according to claim 1, characterized in that: The water washing and air drying of S4 is used together with a grit chamber, and the sedimentation time of the grit chamber needs to be ≥2h.

7. The method for producing artificial granite based on construction waste according to claim 1, characterized in that: The specific steps of the finished stone finishing are: C1, Preparation: Check and confirm the quantity and quality of semi-finished stone, and prepare the required grinding, polishing equipment and tools; C2, coarse grinding: Use the coarse grinding device to grind the stone surface preliminarily, remove the rough part of the surface, and make the surface smoother; C3, fine grinding: on the basis of rough grinding, use fine grinding device to further grind the stone surface, refine the surface and make it smoother; C4, Polishing: Polishing is the last process to make the stone surface brighter. Polishing equipment and polishing materials are used to polish the stone surface to a mirror effect. C5, Inspection: After polishing, the stone is inspected to see if the surface is smooth and flawless, and if the color and texture meet the requirements; C6, Recording and Reporting: Finally, record the relevant data and results of the entire finishing process and generate necessary reports.

8. The method for producing artificial granite based on construction waste according to claim 1, characterized in that: In the above-mentioned S6, during the forced mixing and stirring, a microwave moisture content detector and an infrared temperature sensor with an accuracy of ±0.5% are installed in the stirring kettle to adjust the amount of water added in real time to maintain the water-to-binder ratio accurately to 0.32±0.

02.

9. The method for producing artificial granite based on construction waste according to claim 1, characterized in that: S7, the pulse pressurization mode in the semi-finished product press molding adopts 0-50MPa pressure, 3 cycles, and the holding time of each time is at least 30 seconds.

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