Method for modifying waste mucky clay into planting soil and planting soil
By firing the discarded sludge clay into ceramics and adding potassium yalcohol from ore source, it forms improved planting soil, and solves the problem of difficult use of sludge clay, achieving soil structure improvement and plant growth promotion, and reducing environmental pollution .
Patent Information
- Application Number
- CN202411404887.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-09
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2044-10-09
AI Technical Summary
The discarded sludge clay is difficult to directly utilize due to its high moisture content, high viscosity, high organic matter content and poor particle grading, resulting in a large amount of abandoned soil site and continuous pollution to the environment.
The discarded sludge clay is fired into ceramic granules, and modifying agents are added to the remaining sludge clay, including modified particles and potassium yalcohol from ore, and mixed to form green planting soil to improve soil structure and fertility.
By utilizing the organic matter of sludge clay, the ceramate improves the soil ventilation and permeability, the mineral source potassium yalcohol can loosen the soil structure, improves the ability to retain water and fertilizer, promotes plant growth, and reduces environmental pollution.
Smart Images
Figure CN119256911A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of waste soil improvement, and in particular to a method for modifying waste silty clay into planting soil and planting soil. Background Art
[0002] In foundation excavation, river dredging and other engineering projects, a lot of abandoned soil will be generated, especially some abandoned silty clay. These abandoned silty clays are difficult to be used directly due to their high water content, high viscosity, high organic matter content, poor particle grading, etc. Most of them are treated as waste earthwork, occupying a large amount of abandoned soil sites, and causing continuous pollution to the environment.
[0003] Therefore, how to treat the discarded silty clay for waste utilization has become a problem that needs to be solved urgently by those skilled in the art. Summary of the invention
[0004] In order to treat waste silty clay for waste utilization, the present application provides a method for modifying waste silty clay into planting soil and planting soil.
[0005] To achieve the purpose of the present invention, a method for modifying waste muddy clay into planting soil is provided, comprising the following steps:
[0006] Collect some of the discarded silt clay and burn it into ceramsite;
[0007] Adding an improver to the remaining waste muddy clay, the improver comprising modified particles and mineral potassium humate, the modified particles being ceramsite obtained by firing;
[0008] The abandoned silty clay and the improver are mixed to obtain the greening planting soil.
[0009] According to another aspect of the present application, there is provided planting soil, which is prepared by the aforementioned method of modifying waste silty clay into planting soil.
[0010] Compared with directly treating the abandoned silty clay as waste earthwork, occupying a large amount of abandoned earthwork sites and continuously polluting the environment, this application can turn waste into treasure and improve the abandoned silty clay into greening planting soil for planting green plants. The organic matter in the abandoned silty clay is used to provide nutrition for plants, and the ceramsite fired from the abandoned silty clay itself is used to improve the soil structure, making the soil breathable and water-permeable. The mineral potassium humate is used to loosen the soil aggregate structure, improve the soil's water and fertilizer retention capacity, and promote the growth of plant crops. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1A process flow chart of a method for modifying waste silty clay into greening planting soil according to an embodiment of the present application is shown. DETAILED DESCRIPTION
[0012] Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.
[0013] It should be understood that the terms "length", "width", "height", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application or simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.
[0014] In addition, in order to better illustrate the present application, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.
[0015] The present application provides a method for modifying waste silt clay into greening planting soil, comprising the following steps: S100, dividing the waste silt clay to be modified into two parts, collecting one part for firing, and firing the waste silt clay into ceramsite;
[0016] S300, adding an improver to another part of the discarded silty clay, wherein the improver includes modified particles and mineral potassium humate, and the modified particles are ceramsite fired from the aforementioned discarded silty clay itself; S400, mixing the discarded silty clay and the improver to obtain greening planting soil.
[0017] Abandoned silty clay generally has a high organic matter content and cannot be directly used as engineering soil. The requirement for organic matter content of engineering soil generally does not exceed 5%. This application utilizes the high organic matter content of abandoned silty clay to modify it into greening and planting soil, and utilizes the organic matter in it, turning waste into treasure. In addition, in areas with more such abandoned soil, greening and planting soil is generally scarce, and its economic and social benefits are very considerable.
[0018] The main factors that restrict the use of abandoned silty clay as greening planting soil include excessive density, low non-capillary porosity, low soil infiltration rate, etc., which lead to poor air permeability, poor water retention, and low germination rate. By using appropriate methods to improve or eliminate these restrictive factors, and then adjusting the soil labor by adding organic or inorganic fertilizers, the abandoned silty clay can be modified into high-quality greening planting soil. In order to achieve this goal, porous and lightweight materials such as sawdust, vermiculite, and diatomaceous earth are generally added to the abandoned silty clay for modification, but these materials require additional procurement and transportation, and the availability and cost of the materials are not ideal.
[0019] The present application innovatively burns the discarded silty clay into porous and lightweight ceramsite, and then adds the ceramsite to the discarded silty clay for modification, thereby reducing soil density, increasing soil particles, and making the soil loosely arranged to form non-capillary voids (also known as macropores). The number of macropores increases, the non-capillary porosity (the percentage of soil volume occupied by macropores) is increased, and the structural properties of the soil are changed. Macropores are also called soil ventilation pores, which can make the soil ventilated and permeable to water and promote crop growth. Preferably, the non-capillary porosity of the greening planting soil is adjusted to account for more than 50-60% of the total porosity through the performance of ceramsite, the amount of ceramsite, and the mixing ratio of ceramsite and discarded silty clay.
[0020] Mineral potassium humate can effectively loosen the soil aggregate structure of abandoned silty clay, improve the soil's ability to retain water and fertilizer, regulate the pH value, reduce the content of heavy metals in the soil, and reduce the harm of salt ions to seeds and seedlings; while providing nitrogen, phosphorus, potassium, organic matter and other fertilizers, it has obvious effects on nitrogen fixation, phosphorus dissolution, and potassium activation, and plays a role in increasing roots and strengthening seedlings; it can also enhance the adhesion and rapid absorption capacity of plant roots, especially for physiological diseases of plants caused by lack of trace elements.
[0021] Compared with directly treating the abandoned silty clay as waste earthwork, occupying a large amount of abandoned earthwork sites and continuously polluting the environment, this application can turn waste into treasure and improve the abandoned silty clay into green planting soil for planting green plants. The organic matter in the abandoned silty clay is used to provide nutrition for crop plants, ceramsite is used to improve the soil structure, making the soil breathable and water-permeable, and mineral potassium humate is used to loosen the soil aggregate structure, improve the soil's ability to retain water and fertilizer, and promote the growth of plant crops.
[0022] In a possible implementation, after the improver and the abandoned silty clay are mixed in S300, a step of adjusting soil fertility in S500 is also included. Specifically, the soil fertility adjustment in S500 includes the following steps: according to the planting fertility test result of the mixed soil of the improver and the abandoned silty clay, organic fertilizer, compound fertilizer or single fertilizer is added to the mixed soil of the improver and the abandoned silty clay, and the fertility is adjusted in a targeted manner, and qualified greening planting soil is obtained after reaching the greening planting soil standard.
[0023] It should be noted that this application does not specifically limit the fertility detection method and the soil parameter standard after fertility adjustment, as long as it can meet the planting requirements and the requirements for plant crop growth. It can be flexibly selected according to actual use needs, or the fertility of the basic improved greening planting soil can be tested and adjusted according to the technical requirements of fertility in CJ / T340-2016 "Greening and Greening Planting Soil" or the requirements of fertility in the application scenario.
[0024] In a possible implementation, before adding the modifier to the waste muddy clay in S300, S100 also includes a step of preparing ceramsite, and the preparation of the ceramsite includes the following steps: collecting part of the waste muddy clay to be modified, and firing the collected waste muddy clay into ceramsite. In other words, firstly collect part of the waste muddy clay to be modified, and fire the collected waste muddy clay into ceramsite, and then prepare the modifier, and add the modifier to the waste muddy clay original soil to be modified according to a certain proportion, and mix them evenly.
[0025] This method uses local materials and treats waste with waste, turning discarded silt clay into one of the raw materials of the improver, which can expand the amount of solid waste disposed of, effectively achieve solid waste reduction, reduce the purchase and transportation of external materials, and significantly reduce costs. At the same time, expanded clay can be sold as a commodity to increase the added value of recycled products.
[0026] It should be noted that the present application does not make specific restrictions on the firing process and parameters of ceramsite, as long as the discarded silt clay can be fired to have the characteristics of water absorption, air permeability and light weight, the addition of discarded silt clay can effectively reduce the viscosity of the soil, improve its non-capillary porosity, infiltration rate, water retention and plant germination rate. In addition, because the modified soil is greening planting soil, the hardness of the fired ceramsite does not need to be too large, and it is appropriate to be porous and loose, so that the firing cost will be greatly reduced. Preferably: the firing temperature is within 900°C, and the loose bulk density of the ceramsite is 310-500kg / m 3 , cylinder pressure strength is 5~30Mpa, and softening coefficient is greater than or equal to 0.8.
[0027] In a possible implementation, the bulk density of the ceramsite is 310-500 kg / m3 The cylinder pressure strength of the ceramsite is 5 to 30 MPa, and the softening coefficient of the ceramsite is greater than or equal to 0.8.
[0028] In a possible implementation, before adding the modifier to the abandoned silty clay in S300, the method further includes preparing the modifier in S200, specifically, adding 1% to 5% (by mass fraction of the ceramsite) of mineral potassium humate to the ceramsite, and mixing the ceramsite and the mineral potassium humate to obtain the modifier.
[0029] In a possible implementation, the particle size of the ceramsite is 0 to 20 mm. Further, according to the particle size, in the modified particles, the mass fraction of ceramsite with a particle size of 0 to 5 mm is 60% to 70%, preferably 65%; the mass fraction of ceramsite with a particle size of 5 to 10 mm is 20% to 30%, preferably 25%; the mass fraction of ceramsite with a particle size of 10 to 20 mm is 0 to 10%, preferably 10%.
[0030] In a possible implementation, when the modifier is added to the waste silty clay in S300, the weight ratio of the modifier to the waste silty clay is 1:1-3, preferably 1:1 or 1:1.5 or 1:2 or 1:3.
[0031] In addition, the present application also provides two embodiments as follows to test the performance of the modified greening planting soil.
[0032] Embodiment 1:
[0033] 1000 kg of waste muddy clay was fired into ceramsite as modified particles at a firing temperature of 800°C. The loose bulk density of the ceramsite was 350 kg / m 3 , cylinder pressure strength is 7.5Mpa, softening coefficient is 0.8. In the modified particles, the mass fraction of ceramsite with a particle size of 0-5mm is 60%; the mass fraction of ceramsite with a particle size of 5-10mm is 30%; the mass fraction of ceramsite with a particle size of 10-20mm is 10%;
[0034] Prepare the improver: take 1000 kg of the modified particles, add 30 kg of mineral source potassium humate thereto to obtain the improver;
[0035] The improver and waste silt clay are mixed in a weight ratio of 1:3 to obtain greening planting soil.
[0036] The performance of the greening planting soil prepared by modification was tested, and the results are shown in Table 1:
[0037]
[0038] Embodiment 2:
[0039] Preparation of green planting soil: except that the improver and the waste silt clay are mixed in a weight ratio of 1:1, the rest is consistent with Example 1.
[0040] The performance of the greening planting soil prepared by modification was tested, and the results are shown in Table 2:
[0041]
[0042] In a possible implementation, the step of mixing the modifier and the waste silt clay is performed by a forced mixer or a planetary mixer to mix the two uniformly. The flexible selection and setting of the mixing ratio and the mixing time are based on two points: one is to loosen the waste silt clay; the other is to detect that the density of the mixed soil is less than 1.35Mg / m 3 The proportion is appropriate when the non-capillary porosity is 5% to 25% and the soil infiltration rate is greater than or equal to 5mm / h. Otherwise, continue to adjust the proportion and stir and mix until it meets the standard, and you will get the basic improved greening planting soil.
[0043] According to another aspect of the present application, there is provided a greening planting soil which can be used as greening planting soil and is prepared by the aforementioned method of modifying waste silty clay into greening planting soil.
[0044] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.
Claims
1. A method for modifying waste muddy clay into planting soil, characterized in that: The following steps are involved: Collect some of the discarded silt clay and burn it into ceramsite; Adding an improver to the remaining waste muddy clay, the improver comprising modified particles and mineral potassium humate, the modified particles being ceramsite obtained by firing; The abandoned silty clay and the improver are mixed to obtain the greening planting soil.
2. The method for modifying waste muddy clay into planting soil according to claim 1, characterized in that: After firing the ceramsite and before adding the modifier to the waste muddy clay, the method further includes the step of preparing the modifier, specifically, adding 1% to 5% of mineral-source potassium humate to the ceramsite obtained by firing the waste muddy clay, and mixing the ceramsite and the mineral-source potassium humate to obtain the modifier.
3. The method for modifying waste muddy clay into planting soil according to claim 1, characterized in that: The particle size of the ceramsite is 0 to 20 mm.
4. The method for modifying waste muddy clay into planting soil according to claim 3, characterized in that: According to the particle size, in the modified particles, the mass fraction of ceramsite with a particle size of 0-5 mm is 60%-70%, the mass fraction of ceramsite with a particle size of 5-10 mm is 20%-30%, and the mass fraction of ceramsite with a particle size of 10-20 mm is 0-10%.
5. The method for modifying waste muddy clay into planting soil according to claim 1, characterized in that: The loose bulk density of the ceramsite is 310-500 kg / m 3 .
6. The method for modifying waste muddy clay into planting soil according to claim 1, characterized in that: The cylinder pressure strength of the ceramsite is 5 to 30 MPa.
7. The method for modifying waste muddy clay into planting soil according to claim 6, characterized in that: The softening coefficient of the ceramsite is greater than or equal to 0.
8.
8. The method for modifying waste muddy clay into planting soil according to claim 1, characterized in that: When the improver is added to the waste silty clay, the weight ratio of the improver to the waste silty clay is 1:1-3.
9. A planting soil, characterized in that: The planting soil is prepared by the method for modifying abandoned silty clay into planting soil as described in any one of claims 1 to 8.