Asphalt mixing station recycled powder landscaping nutrient soil and preparation method thereof

Abstract

The invention belongs to the technical field of agricultural and forestry resource utilization of industrial wastes, and particularly relates to landscaping nutrient soil prepared from recycled powder of an asphalt mixing station and a preparation method of the landscaping nutrient soil. The garden greening nutrient soil prepared from the recycled powder of the asphalt mixing station is prepared from the following raw materials in parts by weight: 50 to 75 parts of recycled powder, 20 to 45 parts of biological organic fertilizer, 3 to 25 parts of decomposed cow dung, 2 to 10 parts of mushroom bran, 1 to 5 parts of furfural residue, 2 to 15 parts of vermiculite, 0.2 to 0.5 part of greening nursery stock formula fertilizer and 1 to 5 parts of water-retaining agent. According to the landscaping nutrient soil prepared from the recycled powder of the asphalt mixing station, the technical problem that the industrial resource utilization consumption capacity of the recycled powder of the asphalt mixing station is limited is solved, and an agriculture and forestry resource utilization technical method for preparing the landscaping nutrient soil taking the recycled powder of the asphalt mixing station as a main component is innovated; and the digestion disposal capability of the recycled powder of the asphalt mixing station is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of industrial waste agricultural and forestry resource utilization, and specifically relates to an asphalt mixing station recycled powder landscaping nutrient soil and a preparation method thereof. Background Art

[0002] Asphalt mixing station recycled powder is the stone waste powder collected by the asphalt mixing station in the process of producing asphalt mixture required for road paving. Paving asphalt mixture is made by mixing asphalt, stone, filler and other materials according to a certain ratio. Among them, the stone is crushed into gravel of a certain particle size by the mine stone. In the process of crushing the mine stone, the surface of the gravel must adhere to waste powder particles of various particle sizes, most of which have a particle size of less than 0.075 mm. The existence of these waste powder particles directly affects the bonding force, uniformity and curing strength between the asphalt mixture, and will inevitably affect the engineering quality of highway pavement paving. Therefore, these stone powder particles must be cleaned or removed. At present, there are many dust removal and emission methods for asphalt mixing plants, among which the relatively more commonly used is the bag dust removal wet emission mode to improve the quality of the working environment. In this mode, the mixing stones required by the asphalt mixing plant, also known as aggregates, are conveyed to the heating drum in the required proportion, and the temperature reaches about 180°C. During the heating process, the powder is thrown through the drum, and the powder adhering to the surface of the stone is collected and recycled through the bag dust removal device under the joint action of the blower and induced draft fan, and then mixed with water by the forced mixer and discharged in a centralized manner. The waste stone powder collected, recycled and centrally discharged in the process of cleaning the stone in the asphalt mixing plant is called recycled powder.

[0003] According to statistics from the Ministry of Transport, the total mileage of highways in China will be 5.4368 million kilometers by the end of 2023, and my country's highway mileage ranks first in the world; from 2019 to 2023, an average of 106,100 kilometers will be added each year. It can be seen that with the rapid development of the national economy, the demand for paving of highway construction is increasing, the demand for stone materials in asphalt mixture is increasing, and the amount of recycled powder generated is increasing. Statistics show that about 50 kg of recycled powder is generated for every ton of mixture produced, with a generation rate of about 5%; although there are various levels of highways and different numbers of lanes, it is roughly estimated that about 960 tons of asphalt mixture / kilometer are needed to pave asphalt pavement, that is, about 48 tons of recycled powder are generated per kilometer, and about 260 million tons of recycled powder will be generated by the end of 2023, not to mention that about 5.0928 million tons of recycled powder will be generated each year, so the amount of recycled powder generated is huge.

[0004] The chemical composition of the recycled powder mainly includes SiO2, CaCO3, CaO, silicate, etc., and the average bulk density is 1.15 g / cm 3, particles with a size of ≤0.075 mm (200 mesh) account for more than 80%, with physical and chemical properties such as small particle size, high mud content, small specific surface area, low plasticity, weak cohesion, and poor water stability. The recycling of recycled powder from asphalt mixing plants is mainly used as raw materials to prepare mineral powder fillers, concrete materials, road base materials and other industrial recycling. However, due to its own physical and chemical properties such as complex composition, small particle fineness, high mud content, and difficulty in solidification, the amount added in many recycling technologies accounts for less than 25%, and most are around 5%. The low proportion and application limitations greatly limit the digestion capacity of recycled powder; there are also various secondary problems or hidden dangers such as immature industrial recycling technology, multiple formula ingredients, high processing costs, poor mixture performance, and micro cracks after application. At the same time, as of now, there has been no report on the agricultural and forestry resource utilization of recycled powder from asphalt mixing plants. It can be seen that, except for a small amount of recycled powder used as engineering fillers, most of the huge amount of recycled powder is abandoned and piled up because it cannot be used. It not only occupies a large amount of land resources, but also because of its fine particles, it is easy to raise dust, pollute the surrounding environment, and endanger human health. Therefore, the improved utilization of recycled powder in asphalt mixing plants is a production problem that road and bridge application companies urgently need to solve, and it is also a technical bottleneck for achieving their high-quality development.

[0005] Although the recycled powder from asphalt mixing plants is not soil in the strict sense, it can be called soil parent material and has primary fertility. At the same time, the main chemical properties of the recycled powder are high pH (8.53-11.75), low organic matter content (0.27-0.83 g / kg), little nitrogen and phosphorus effective nutrients, and only rich in fast-acting potassium. However, the contents of polluting elements such as cadmium, mercury, arsenic, lead, chromium, copper, hexachloride, DDT and benzopyrene are far lower than those in GB 15618-2018. The agricultural land soil pollution risk screening value in the "Soil Environmental Quality Agricultural Land Soil Pollution Risk Control Standard (Trial)" has a low pollution risk, which can be ignored under normal circumstances. Therefore, the recycled powder from the asphalt mixing plant can be completely improved into nutrient soil for landscaping for agricultural and forestry resource utilization. It not only realizes the agricultural and forestry resource utilization of industrial waste, reduces the occupation of land resources, reduces the risk of environmental pollution and harm to human health, but also further solves the rapid development of urbanization for the large demand for nutrient soil for urban landscaping matrix, turning waste into treasure, significantly increasing economic, social and ecological benefits, and truly promoting the ecological cycle of industry and agriculture and green, efficient and sustainable development. Summary of the invention

[0006] The purpose of the present invention is to provide a landscaping nutrient soil for recycling powder from an asphalt mixing station, wherein the nutrient soil realizes the agricultural and forestry resource utilization of the recycled powder from an asphalt mixing station; the present invention also provides a preparation method thereof.

[0007] The asphalt mixing station recycled powder gardening nutrient soil of the present invention is composed of the following raw materials in parts by weight: 50-75 parts of recycled powder, 20-45 parts of biological organic fertilizer, 3-25 parts of decomposed cow dung, 2-10 parts of mushroom chaff, 1-5 parts of furfural residues, 2-15 parts of vermiculite, 0.2-0.5 parts of greening seedling formula fertilizer, and 1-5 parts of water retaining agent.

[0008] in: The recycled powder is waste powder collected and recycled by asphalt mixing plants, with a particle size of ≤2mm and a water content of ≤5%.

[0009] The bio-organic fertilizer is a fertilizer that complies with the standard of "NY 884-2012 Bio-organic Fertilizer"; its purpose is to increase the organic matter content of the recycled powder and improve the biological properties of the recycled powder, stimulate the activity of beneficial microorganisms, and enhance biological fertility.

[0010] The decomposed cow dung is fermented and decomposed cow dung that meets the standard of "NY / T 525-2021 Organic Fertilizer"; the purpose is not only to increase the organic matter of the recycled powder, but also to mainly use the fiber of the decomposed cow dung to improve the structure of the recycled powder and promote the development of the recycled powder structure.

[0011] The mushroom bran is an organic material obtained by sterilizing, disinfecting and crushing the discarded mushroom sticks after mushroom harvesting, with a particle size of ≤2mm and a moisture content of ≤3%. The mushroom bran is mainly used to improve the physical properties of the recovered powder such as porosity, air permeability and water permeability while increasing carbon.

[0012] The furfural residue is the waste left over from the production of furfural from corn cobs, is rich in cellulose, lignin and a small amount of sulfuric acid, and has a pH of about 2; adding furfural residue can both increase the organic matter of the recovered powder and reduce the acidity and alkalinity of the recovered powder, thereby regulating its chemical properties.

[0013] The vermiculite is a 2:1 type expansive layered aluminum silicate clay mineral with good permeability and strong water and fertilizer retention capacity. It is a commonly used soil improvement regulator and is often used as a garden flower matrix material with a particle size of ≤1mm. The purpose of adding vermiculite is to adjust the porosity and water and fertilizer retention properties of the recycled powder and improve its physical fertility.

[0014] The greening seedling formula fertilizer is a fertilizer containing nutrients prepared according to the fertilizer requirements of greening seedlings and complies with the standard of "GB / T 21633-2020 Blended Fertilizer (BB Fertilizer)". The blended nutrient element fertilizer is mainly one or more conventional physiologically acidic or physiologically neutral fertilizers, among which slow-release nitrogen: fast-release nitrogen ≥50%:50%; the greening seedling formula fertilizer is used mainly to improve the recovered powder nutrients, balance the nutrition, regulate the slow-release nutrients, and enhance the chemical fertility.

[0015] Preferably, the greening seedling formula fertilizer is one of the ryegrass formula fertilizer or the cedar seedling formula fertilizer.

[0016] The water retaining agent is a soil conditioner for regulating water retention that complies with the standard of "NY / T 886-2022 Agricultural and Forestry Water Retaining Agent". The main purpose is to improve the water and fertilizer retention of the recycled powder and improve its structure.

[0017] Preferably, the water retaining agent is one of polyacrylamide, starch-polyacrylamide, carboxymethyl cellulose or polyacrylonitrile.

[0018] The method for preparing the gardening nutrient soil with recycled powder from an asphalt mixing station according to the present invention comprises the following steps: (1) First, according to the fertilizer requirements of garden greening seedlings and the requirements for the ratio of slow-acting nitrogen, select large, medium and trace element fertilizer raw materials to prepare the required greening seedling formula fertilizer; (2) After the recycled powder is passed through a 2 mm sieve to remove impurities, the required number of portions is weighed and added to the mixing agitator. At the same time, the amount of other added materials is calculated based on the amount of recycled powder and the required addition ratio and weighed for later use; (3) Sprinkle clean water into the mixing and blending machine where the recycled powder is added to increase the moisture content of the recycled powder to 10% to 15% and stir for 3 to 5 minutes to make it evenly wet; first sprinkle the weighed furfural residue evenly into the mixing and blending machine, then start the mixing and blending machine and stir for 5 to 10 minutes to mix the furfural residue and the recycled powder evenly; (4) After the furfural residue and the recycled powder are evenly mixed in step (3), they are evenly sprinkled into a continuously stirring mixer in the order of grouping greening seedling formula fertilizer and water retaining agent, mushroom shavings and vermiculite, biological organic fertilizer and decomposed cow dung. Each group of added materials is added in sequence after the previous group of added materials and the aforementioned recycled powder mixed materials are evenly mixed. The mixer is stopped until all the mixed materials are evenly mixed, thereby preparing recycled powder garden greening nutrient soil for asphalt mixing station.

[0019] Compared with the prior art, the advantages and beneficial effects of the present invention are: (1) The nutrient soil for gardening and landscaping made of recycled powder from asphalt mixing plants described in the present invention solves the technical problem of limited consumption capacity for industrial resource utilization of recycled powder from asphalt mixing plants, innovates the technical method for agricultural and forestry resource utilization of gardening and landscaping nutrient soil with recycled powder from asphalt mixing plants as the main component, and improves the digestion and disposal capacity of recycled powder from asphalt mixing plants.

[0020] (2) The nutrient soil for landscaping of recycled powder from asphalt mixing plants described in the present invention is a low-carbon, green, ecologically circular, high-quality and efficient technical method for improving and utilizing recycled powder from asphalt mixing plants. This technical method can not only solve the risks of waste accumulation from asphalt mixing plants occupying land, polluting the environment and endangering human health, but also turn waste into treasure and improve and cultivate it into nutrient soil with high demand for urban landscaping; it not only saves the cost of disposing of recycled powder waste, but also obtains significant economic, social and ecological benefits. The bio-organic fertilizer, decomposed cow dung, fungus bran, furfural residue and the like in the improved materials of this technology are recycled products of organic waste or their reuse, and therefore, it also has the characteristic of treating waste with waste.

[0021] (3) The asphalt mixing plant recycled powder landscaping nutrient soil described in the present invention has a wide range of uses. It can be used not only in urban landscaping, but also in the reclamation of abandoned land from mining and collapse, abandoned land from water conservancy and transportation construction projects, and abandoned land caused by natural disasters and man-made pollution, which is conducive to more rapid reshaping of landforms, reconstruction of soil, and reconstruction of vegetation.

[0022] (4) The method for preparing nutrient soil for landscaping using recycled powder from asphalt mixing plants described in the present invention has the characteristics of simple process, simple operation and easy promotion. Its promotion and application in asphalt mixing plants can solve the technical problem of difficult disposal of recycled powder from asphalt mixing plants, and further promote the high-quality and rapid development of road and bridge construction enterprises. DETAILED DESCRIPTION

[0023] The present invention is further described below with reference to the embodiments.

[0024] Example 1 Gardening seedlings: ryegrass The asphalt mixing station recycled powder landscaping nutrient soil described in Example 1 is composed of the following raw materials, measured by weight: 60 parts of recycled powder, 21.8 parts of biological organic fertilizer, 5 parts of decomposed cow dung, 3 parts of mushroom bran, 2 parts of furfural residue, 6 parts of vermiculite, 0.2 parts of greening seedling formula fertilizer, and 2 parts of water retaining agent.

[0025] in: The recycled powder is waste powder collected and recycled by asphalt mixing stations, with a particle size of ≤2mm and a water content of 3.5%, and is taken from Shandong Ludong Road and Bridge Co., Ltd.

[0026] The biological organic fertilizer is a commercially available organic fertilizer product that meets the standard of "NY 884-2012 Biological Organic Fertilizer", purchased from Shandong Lianyou Biotechnology Co., Ltd., with an organic matter content ≥30% and total nutrients (N+P2O5+K2O) ≥4%; the purpose is to increase the organic matter content of the recycled powder and improve the biological properties of the recycled powder, stimulate the activity of beneficial microorganisms, and enhance biological fertility.

[0027] The decomposed cow dung is commercially available fermented decomposed cow dung that meets the "NY / T 525-2021 Organic Fertilizer" standard and is purchased from Shandong Lianyou Biotechnology Co., Ltd.; the purpose is not only to increase the organic matter of the recycled powder, but also to mainly use the fiber of the decomposed cow dung to improve the structure of the recycled powder and promote the development of the recycled powder structure.

[0028] The mushroom bran is an organic material obtained by sterilizing, disinfecting and crushing the discarded mushroom sticks after mushroom harvesting, with a particle size of ≤2mm and a water content of 2.5%, purchased from Shandong Lianyou Biotechnology Co., Ltd. The mushroom bran is mainly used to improve the physical properties of the recovered powder such as porosity, air permeability and water permeability while increasing carbon.

[0029] The furfural residue is the waste remaining from the production of furfural from corn cobs, is rich in cellulose, lignin and a small amount of sulfuric acid, has a pH of 2, and is purchased from Shandong Lianyou Biotechnology Co., Ltd.; adding furfural residue can not only increase the organic matter of the recycled powder, but also reduce the acidity and alkalinity of the recycled powder, thereby regulating its chemical properties.

[0030] The vermiculite is a 2:1 type expansive layered aluminum silicate clay mineral with good permeability and strong water and fertilizer retention capacity. It is a commonly used soil improvement regulator and is often used as a garden flower matrix material. The particle size is ≤1mm and is purchased from a local flower market. The purpose of adding vermiculite is to adjust the porosity and water and fertilizer retention properties of the recycled powder and improve its physical fertility.

[0031] The greening seedling formula fertilizer is a fertilizer containing nutrients prepared according to the fertilizer requirements of greening seedlings and conforms to the standard of "GB / T 21633-2020 Blended Fertilizer (BB Fertilizer)". It uses nutrient element fertilizers purchased from the local agricultural supply market, and its raw materials are: urea, ammonium sulfate, monoammonium phosphate, diammonium phosphate, superphosphate, double superphosphate, potassium sulfate, calcium sulfate, magnesium sulfate, ferrous sulfate, manganese sulfate, zinc sulfate, borax and coated slow-release urea (release period 3 months, N 42%), which are mixed and prepared, wherein the slow-acting nitrogen: fast-acting nitrogen is 50%:50%, which is used to increase the recovered powder nutrients, balance its nutrition, regulate the ratio of its slow-acting and fast-acting nutrients, and enhance its chemical fertility.

[0032] The formula fertilizer for greening seedlings is ryegrass formula fertilizer.

[0033] The water retaining agent is a soil conditioner that complies with the standard of "NY / T 886-2022 Agricultural and Forestry Water Retaining Agent" and regulates water retention, and polyacrylamide is selected; the main purpose is to improve the water and fertilizer retention of the recycled powder and improve its structure.

[0034] The method for preparing the gardening nutrient soil of recycled powder from an asphalt mixing station described in Example 1 is composed of the following steps: (1) First, prepare the required ryegrass formula fertilizer according to the fertilizer requirement of ryegrass, N-P2O5-K2O is 16-8-10 and the ratio of slow-acting nitrogen is 50%:50%; (2) The waste powder collected and recycled from the asphalt mixing plant is sieved through a 2mm sieve to remove impurities and weigh the required number of portions. 60 portions of the recycled powder are added to the mixer. At the same time, the amount of other added materials is calculated based on the amount of recycled powder and the required addition ratio and weighed for later use; (3) Sprinkle an appropriate amount of clean water into the mixer where the recycled powder is added to increase the moisture content of the recycled powder to 10% and stir for 3 minutes to make it evenly wet; first, sprinkle 2 parts of furfural residue evenly into the mixer, then start the mixer and stir for 5 minutes to mix the furfural residue and the recycled powder; (4) After the furfural residue and the recovered powder are evenly mixed in step (3), 0.2 parts of ryegrass formula fertilizer and 2 parts of water retaining agent, 3 parts of fungus bran and 6 parts of vermiculite, 21.8 parts of biological organic fertilizer and 5 parts of decomposed cow dung are evenly sprinkled into a continuously stirring mixer in the order of grouping. Each group of added materials is added in sequence after the previous group of added materials and the aforementioned recovered powder mixed material are evenly mixed. The mixer is stopped until all the mixed materials are evenly mixed to obtain ryegrass nutrient soil for landscaping.

[0035] The nutrient status of the prepared ryegrass nutrient soil is shown in Table 1.

[0036] Table 1 Nutrient related conditions of prepared ryegrass nutrient soil

[0037] Verification test: The recycled powder of the asphalt mixing plant was taken from Shandong Ludong Road and Bridge Co., Ltd., the unimproved recycled powder was used as the control CK treatment, and the landscaping ryegrass nutrient soil prepared in Example 1 was used as the treatment in Example 1. There were 2 treatments in total, and each treatment was repeated 3 times. A potted ryegrass experiment was carried out on May 13, 2024, and the days and emergence rate of ryegrass were monitored. The plant height, fresh weight and dry weight of the aboveground ryegrass biomass at the first mowing on July 10, 2024 are shown in Table 2.

[0038] Table 2 Ryegrass emergence and growth indexes at the first mowing under different experimental treatments

[0039] Note: The index data are mean ± standard error. The same lowercase letters after the data in the same column indicate that there is no significant difference between different treatments ( P ≤0.05).

[0040] As shown in Table 1, compared with the unmodified recycled powder, the ryegrass nutrient soil for gardening in Example 1 of the present invention has no difference in the number of days for ryegrass to emerge, but has significantly higher ryegrass emergence rate, plant height at the first mowing, and fresh weight and dry weight of aboveground biomass than the control CK treatment. This shows that the ryegrass nutrient soil for gardening prepared by improving the recycled powder of the asphalt mixing plant is conducive to the emergence and growth of ryegrass, and the nutrient soil and its preparation method have a popular application effect and value in gardening lawn grass.

[0041] Example 2 Gardening seedlings: cypress seedlings The asphalt mixing station recycled powder landscaping nutrient soil described in Example 2 is composed of the following raw materials, measured by weight: 70 parts of recycled powder, 20 parts of biological organic fertilizer, 3.5 parts of decomposed cow dung, 2 parts of mushroom bran, 1 part of furfural residue, 2 parts of vermiculite, 0.5 parts of greening seedling formula fertilizer, and 1 part of water retaining agent.

[0042] in: The recycled powder is waste powder collected and recycled by asphalt mixing stations, with a particle size of ≤2mm and a water content of 3%, and is taken from Shandong Ludong Road and Bridge Co., Ltd.

[0043] The biological organic fertilizer is a commercially available organic fertilizer product that meets the standard of "NY 884-2012 Biological Organic Fertilizer", purchased from Shandong Lianyou Biotechnology Co., Ltd., with an organic matter content ≥30% and total nutrients (N+P2O5+K2O) ≥4%; the purpose is to increase the organic matter content of the recycled powder and improve the biological properties of the recycled powder, stimulate the activity of beneficial microorganisms, and enhance biological fertility.

[0044] The decomposed cow dung is commercially available fermented decomposed cow dung that meets the "NY / T 525-2021 Organic Fertilizer" standard and is purchased from Shandong Lianyou Biotechnology Co., Ltd.; the purpose is not only to increase the organic matter of the recycled powder, but also to mainly use the fiber of the decomposed cow dung to improve the structure of the recycled powder and promote the development of the recycled powder structure.

[0045] The mushroom bran is an organic material obtained by sterilizing, disinfecting and crushing the discarded mushroom sticks after mushroom harvesting, with a particle size of ≤2mm and a water content of 2.5%, purchased from Shandong Lianyou Biotechnology Co., Ltd. The mushroom bran is mainly used to improve the physical properties of the recovered powder such as porosity, air permeability and water permeability while increasing carbon.

[0046] The furfural residue is the waste remaining from the production of furfural from corn cobs, is rich in cellulose, lignin and a small amount of sulfuric acid, has a pH of 2, and is purchased from Shandong Lianyou Biotechnology Co., Ltd.; adding furfural residue can not only increase the organic matter of the recycled powder, but also reduce the acidity and alkalinity of the recycled powder, thereby regulating its chemical properties.

[0047] The vermiculite is a 2:1 type expansive layered aluminum silicate clay mineral with good permeability and strong water and fertilizer retention capacity. It is a commonly used soil improvement regulator and is often used as a garden flower matrix material. The particle size is ≤1mm and is purchased from a local flower market. The purpose of adding vermiculite is to adjust the porosity and water and fertilizer retention properties of the recycled powder and improve its physical fertility.

[0048] The greening seedling formula fertilizer is a fertilizer containing nutrients prepared according to the fertilizer requirements of greening seedlings and conforms to the standard of "GB / T 21633-2020 Blended Fertilizer (BB Fertilizer)". It uses nutrient element fertilizers purchased from the local agricultural supply market, and its raw materials are: urea, ammonium sulfate, monoammonium phosphate, diammonium phosphate, superphosphate, double superphosphate, potassium sulfate, calcium sulfate, magnesium sulfate, ferrous sulfate, manganese sulfate, zinc sulfate, borax and coated slow-release urea (release period 3 months, N 42%), wherein the slow-release nitrogen: fast-release nitrogen is 80%:20%, which is used to increase the recovered powder nutrients, balance its nutrition, regulate the ratio of slow-release and fast-release nutrients, and enhance its chemical fertility.

[0049] The formula fertilizer for greening seedlings is the formula fertilizer for juniper seedlings.

[0050] The water retaining agent is a soil conditioner that complies with the standard of "NY / T 886-2022 Agricultural and Forestry Water Retaining Agent" and regulates water retention. Polyacrylamide is selected, and its main purpose is to improve the water and fertilizer retention of the recycled powder and improve its structure.

[0051] The method for preparing the gardening nutrient soil of recycled powder from an asphalt mixing station described in Example 2 is composed of the following steps: (1) First, prepare the required formula fertilizer for juniper seedlings according to the fertilizer requirement of juniper seedlings, N-P2O5-K2O is 20-10-10 and the ratio of slow-acting nitrogen is 80%:20%; (2) The waste powder collected and recycled from the asphalt mixing plant is passed through a 2mm sieve to remove impurities and weigh the required number of portions. 70 portions of the recycled powder are added to the mixer. At the same time, the amount of other added materials is calculated based on the amount of recycled powder and the required addition ratio and weighed for later use; (3) Sprinkle an appropriate amount of clean water into the mixer where the recycled powder is added to increase the moisture content of the recycled powder to 15% and stir for 5 minutes to make it evenly wet; first, sprinkle 1 portion of furfural residue evenly into the mixer, then start the mixer and stir for 10 minutes to mix the furfural residue and the recycled powder; (4) After the furfural residue and the recycled powder are evenly mixed in step (3), they are evenly sprinkled into a continuously stirring mixer in the order of 0.5 parts of the formula fertilizer for juniper seedlings and 1 part of the water retaining agent, 2 parts of the fungus husk and 2 parts of the vermiculite, 20 parts of the biological organic fertilizer and 3.5 parts of the decomposed cow dung. Each group of added materials is added in sequence after the previous group of added materials and the aforementioned recycled powder mixed materials are evenly mixed. The mixer is stopped until all the mixed materials are evenly mixed to obtain the nutrient soil for garden juniper.

[0052] The nutrient status of the prepared nutrient soil for Tuber is shown in Table 3.

[0053] Table 3 Nutrient related conditions of prepared nutrient soil for cedar

[0054] Verification test: The recycled powder of the asphalt mixing plant was taken from Shandong Ludong Road and Bridge Co., Ltd., the unimproved recycled powder was used as the control CK treatment, and the nutrient soil for gardening juniper seedlings prepared in Example 2 was used as the treatment in Example 2. There were 2 treatments in total, and each treatment was repeated 10 times. On April 9, 2024, three-year-old juniper seedlings were used for potted plant experiments, and the survival rate of the juniper seedlings was monitored on July 9, 2024. At least 3 plants were selected from the surviving plants to monitor plant height and biological growth. The results are shown in Table 4.

[0055] Table 4 Survival rate, plant height and biomass growth of juniper seedlings under different experimental treatments

[0056] Note: The index data are mean ± standard error. The same lowercase letters after the data in the same column indicate that there is no significant difference between different treatments ( P ≤0.05).

[0057] It can be seen from Table 2 that compared with the control CK treatment without improved recycled powder, the survival rate of the juniper seedlings in Example 2 was 14.29% higher, and the plant height and the biological growth of the whole plant were significantly higher than those of the control CK treatment, indicating that the nutrient soil for garden juniper seedlings prepared with improved recycled powder from asphalt mixing plants is beneficial to the survival of juniper seedlings and promotes the growth of juniper seedlings, and has broad prospects for practical application and promotion in garden juniper seedlings.

Claims

1. A kind of asphalt mixing station recycled powder landscaping nutrient soil, Features: The invention is composed of the following raw materials in parts by weight: 50-75 parts of recycled powder, 20-45 parts of biological organic fertilizer, 3-25 parts of decomposed cow dung, 2-10 parts of mushroom bran, 1-5 parts of furfural residues, 2-15 parts of vermiculite, 0.2-0.5 parts of greening seedling formula fertilizer and 1-5 parts of water retaining agent.

2. The asphalt mixing plant recycled powder landscaping nutrient soil according to claim 1, Features: The recycled powder is waste powder collected and recycled by asphalt mixing plants, with a particle size of ≤2mm and a water content of ≤5%.

3. The asphalt mixing plant recycled powder landscaping nutrient soil according to claim 1, Features: The biological organic fertilizer is a fertilizer that meets the standard of "NY 884-2012 Biological Organic Fertilizer"; the decomposed cow dung is fermented and decomposed cow dung that meets the standard of "NY / T 525-2021 Organic Fertilizer".

4. The asphalt mixing plant recycled powder landscaping nutrient soil according to claim 1, Features: The mushroom dregs are organic materials obtained by sterilizing, disinfecting and crushing the discarded mushroom sticks after mushroom harvesting, with a particle size of ≤2mm and a water content of ≤3%; The furfural residue is the waste remaining from the production of furfural from corn cobs.

5. The asphalt mixing plant recycled powder landscaping nutrient soil according to claim 1, Features: The vermiculite is a 2:1 type expansive layered aluminosilicate clay mineral; The greening seedling formula fertilizer is a fertilizer that contains nutrient elements and is formulated according to the fertilizer requirements of greening seedlings and complies with the standard of "GB / T21633-2020 Blended Fertilizer (BB Fertilizer)".

6. The asphalt mixing plant recycled powder landscaping nutrient soil according to claim 5, Features: The greening seedling formula fertilizer is one of the ryegrass formula fertilizer or the cedar seedling formula fertilizer.

7. The asphalt mixing plant recycled powder landscaping nutrient soil according to claim 1, Features: The water retaining agent is a soil conditioner for regulating water retention that complies with the standard of "NY / T 886-2022 Agricultural and Forestry Water Retaining Agent".

8. The asphalt mixing plant recycled powder landscaping nutrient soil according to claim 7, Features: The water retaining agent is one of polyacrylamide, starch-polyacrylamide, carboxymethyl cellulose or polyacrylonitrile.

9. A method for preparing the nutrient soil for landscaping using recycled powder from an asphalt mixing plant as claimed in claim 1, Features: It consists of the following steps: (1) First, according to the fertilizer requirements of garden greening seedlings and the requirements for the ratio of slow-acting nitrogen, select large, medium and trace element fertilizer raw materials to prepare the required greening seedling formula fertilizer; (2) After the recycled powder is passed through a 2 mm sieve to remove impurities, the required number of portions is weighed and added to the mixing agitator. At the same time, the amount of other added materials is calculated based on the amount of recycled powder and the required addition ratio and weighed for later use; (3) Sprinkle clean water into the mixing and blending machine where the recycled powder is added to increase the moisture content of the recycled powder to 10% to 15% and stir for 3 to 5 minutes to make it evenly wet; first sprinkle the weighed furfural residue evenly into the mixing and blending machine, then start the mixing and blending machine and stir for 5 to 10 minutes to mix the furfural residue and the recycled powder evenly; (4) After the furfural residue and the recycled powder are evenly mixed in step (3), they are evenly sprinkled into a continuously stirring mixer in the order of grouping greening seedling formula fertilizer and water retaining agent, mushroom shavings and vermiculite, biological organic fertilizer and decomposed cow dung. Each group of added materials is added in sequence after the previous group of added materials and the aforementioned recycled powder mixed materials are evenly mixed. The mixer is stopped until all the mixed materials are evenly mixed, thereby preparing recycled powder garden greening nutrient soil for asphalt mixing station.

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