• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention discloses a method for improving sandy soil in a mining area by abandoned coal slime, and belongs to the technical field of mine environment protection. The method includes the following steps of (l) performing soil granularity 5 determination and analysis to determine whether soil is the sandy soil or not; (2) spreading and covering a certain thickness of abandoned coal slime on land parcels to be improved; (3) uniformly broadcasting a certain amount of compound basic fertilizer; (4) performing deep ploughing by a rotary cultivator so that the coal slime, the basic fertilizer and the soil are sufficiently mixed, and then performing leveling by a harrow 10 leveler; and (5) after selective planting of proper crops, performing scientific irrigation, covering straw or mulching films, reasonably dressing quick—acting fertilizer, and dynamically monitoring indexes of reconstructed soil granularity and the like. The method for improving the sandy soil in the mining area by the abandoned coal slime has the advantages that texture and granular structures of the sandy soil in the mining area 15 can be obviously improved; contents of beneficial microorganisms and organic matters in the soil are increased, so that the soil has good water holding and fertilizer retaining capability and ventilation performance; a drought resistance capability of crops is improved; meanwhile, waste materials can be changed into valuable materials; resource utilization of coal mining wastes is realized; and problems of land occupation and 20 environment pollution caused by abandoned coal slime accumulation are effectively solved.
    公开号:NL2024997A
    申请号:NL2024997
    申请日:2020-02-26
    公开日:2021-09-01
    发明作者:Zhang Kun；Xu Liangji；Wu Jianfei；Yan Jiaping；Bi Jingrui；Fu Jun
    申请人:Univ Anhui Sci & Technology；Huaibei Mining Group Co Ltd；Huainan Mining Group Co Ltd；
    IPC主号:
    专利说明:

    AMETHOD FOR IMPROVING SANDY SOIL IN MINING AREA BY ABANDONED COAL SLIME
    BACKGROUND Technical Field The present invention relates to the technical field of mine environment protection, in particular to a method for improving sandy soil in a mining area by abandoned coal slime.
    Related Art Coal is a fossil fuel with the most abundant reserves in the world. BP World Energy Source Statistical Yearbook 2019 shows that the global coal output in 2018 rebounded to 8 billion tons or above, wherein the China coal output accounted for 46% of the total output in the world, and ranked first in the world. Meanwhile, China is also a big consumption country of coal. In 2018, the China coal consumption accounted for 50.5% of the total consumption in the world, and the coal is in an unchallenged dominant position in an energy strategic pattern in China. 80% of total coal resources in China are distributed in the west area, and the coal mining center has already transferred to the west area, wherein the sum of the coal output in three provinces: Inner Mongolia, Shanxi and Shaanxi accounts for about 66% of the total output in the whole country. Erdos coal field located in an Inner Mongolia-Shanxi-Shaanxi contiguous area is the biggest explored coal field in China, is also a world-class super big high-quality coal field, and has become a key area of coal resource development in China. The area is in an arid and semiarid climatic zone, has limited groundwater resources and insufficient atmospheric precipitation, and the ground surface is mostly covered by quaternary aeolian sand loose layers.
    Soil sampling detection results of mines of Shendongdaliuta coal mine, Shangwan coal mine, Bulianta coal mine, Buertai coal mine, Liuta coal mine, Huainan mining group western company Selian No.2 coal mine, Bojianghaizi mine and the like in the area show that if a proportion of soil particles with a particle size greater than 0.02 mm exceeds 88%, the soil is the sandy soil according to an international soil texture classification standard. The sandy soil has the characteristics of loose structure, more sand particles and few clay particles, big pores among particles, high water permeability, fast seepage of rainwater and irrigation water, small water storage capacity and great evaporation water loss, so that the water holding capability is poor. The sandy soil has coarse capillarity, a rise height of capillarity water is small, and upper layer soil cannot acquire water supplementation through a groundwater capability rise effect under the condition of low groundwater level, so that the drought resistance capability is weak. Additionally, the sandy soil has few nutrients, and has poor fertilizer retraining capability due to lack of the clay particles and organic matters, and applied quick-acting fertilizers are easy to lose along with the rainwater and the irrigation water. The sandy soil has the poor water holding and fertilizer retaining capability. Due to high-intensity coal mining, the ground surface in the mining area generates subsidence deformation, a great number of ground cracks are formed, and the water and soil loss and vegetation degradation are aggravated, so that the soil quality is further reduced. Meanwhile, a great number of wastes are generated in a coal production process, and the coal slime is important one. The coal slime has the characteristics of fine granularity, great viscosity, high water holding performance and high water content. Due to the characteristics, the coal slime is very instable in a stacked state, may be lost when meeting water, and may fly when meeting wind. A great number of land resources in the mining area are occupied, and environment pollution is also caused. Due to high transportation cost, the off-site transfer utilization of coal mining wastes such as the coal slime in an aeolian sand mining area is limited. Ecological environment protection and green development idea implementation have become the consensus of the whole society. Under the background, the safe digestion of coal mining wastes such as the coal slime increasingly becomes a problematic issue for limiting more local coal enterprises to further develop.
    SUMMARY The present invention is directed to provide a method for improving sandy soil in a mining area by abandoned coal slime aiming at above-mentioned problems. Through scientific use of the coal slime, scientific preparation and application of basic fertilizer, and scientific cultivation and management, soil in the mining area is reconstructed so as to achieve a goal of improving the sandy soil in the mining area. Waste materials are changed into valuable materials; resource utilization of coal mining wastes is realized, and damage and pollution caused by coal mining and abandoned coal slime accumulation on ecological environment in the mining area are effectively avoided.
    The method for improving the sandy soil in the mining area by the abandoned coal slime is characterized by including the following steps of:
    1. determining soil properties: performing soil granularity determination and analysis, and determining whether the soil is the sandy soil or not;
    2. spreading the abandoned coal slime: spreading and covering the abandoned coal slime being 10 to 15 cm thick on land parcels to be improved, and performing natural sun-curing and air-drying until a water content is 15% to 30%;
    3. broadcasting compound basic fertilizer: uniformly broadcasting the compound basic fertilizer according to consumption of 1000 to 1500 kg/mu;
    4. performing ploughing and harrow leveler operation: performing deep ploughing by a rotary cultivator, and then performing leveling by a harrow leveler so that the coal slime, the basic fertilizer and the soil are sufficiently mixed; and
    5. performing later-period maintenance management: after selective planting of proper crops, performing scientific irrigation, covering straw or mulching films, reasonably dressing quick-acting fertilizer, and dynamically monitoring indexes of reconstructed soil granularity, quick-acting nutrient content and the like and crop growth and physiological indexes for a long time.
    A determination standard of the sandy soil is that a proportion of soil particles with a particle size being 0.02 to 2 mm is 85% to 100%.
    A proportion of particles with a particle size being smaller than 0.02 mm in the abandoned coal slime is not less than 50%.
    The compound basic fertilizer includes the following ingredients in percentage by weight: 80 to 90% of decomposed organic fertilizer, 5 to 15% of water-soluble amino-humic acid particles, 1 to 10% of nanometer carbon and 0.1 to 2% of microbial agent.
    The decomposed organic fertilizer is fertilizer prepared from livestock and poultry excrement, crop straw, weed, fallen leaves and the like through aerobic fermentation and decomposition. The water-soluble amino-humic acid particles are water-soluble granular fertilizer prepared from amino acids and humic acids through compounding.
    The nanometer carbon is water-soluble spherical nanometer carbon particles with a particle size ranging between 5 nm and 80 nm. The microbial agents are biological products containing efficient active beneficial microbial bacteria, produced by a modern biological technology and suitable for being used in saline-alkali soil in an arid area, and active ingredients include one or more of strains in bacillus subtilis, paenibacillus mucilaginosus, bacillus megatherium, bacillus licheniformis, bacillus laterosporus, bacillus mucilaginosus, streptomyces jingyangensis, mycorrhizal fungi, azotobacter vinelandii, actinomycetes, photosynthetic bacteria, aspergillus oryzae, lactobacillus flora and the like, and ang viable count is 200.
    Each ingredient of the compound basic fertilizer may be singly broadcasted, and may also be broadcasted after being uniformly mixed. An application time of the microbial agents is before 8 o'clock in the morning, after 5 o'clock in the afternoon or on cloudy days without rain.
    The ploughing and harrow leveler operation is performed after the broadcasting of the compound basic fertilizer, and is particularly performed within 2 hours after the broadcasting of the microbial agents, and a ploughing depth is 25 to 30 cm.
    In the particle composition of the reconstructed soil, if the content of sand particles is higher than 85%, repeating the step 2 to the step 4.
    A particle size of the sand particles ranges between 0.02 mm and 2 mm.
    Beneficial effects of the invention: Local materials are used, waste materials are changed into valuable materials, a formula is scientific, the process is simple, the popularization and application performance is high, problems of land resource occupation and environment pollution caused by abandoned coal slime accumulation are solved, the quality of the sandy soil in the mining area is improved, and a comprehensive, all-around, integrated and good-circulation solution is provided for the resource utilization of coal mining wastes such as coal slime and the governance of the sandy soil in the mining area. The present invention has the following concrete characteristics that: (1) The local materials are used, and the waste materials are changed into the valuable materials. The coal slime used for improving the soil is from local coal mines, so that high cost generated by long-distance transportation is avoided, and the engineering cost is reduced. The sources of the coal slime are sufficient, by taking the Selian No.2 coal mine and the Bojianghaizi mine as examples, the annual coal output is about 4 million tons, the coal slime output exceeds 250 thousand tons, and the requirements of soil improving engineering may be met. Meanwhile, the coal slime is instantly used after being generated, so that the conditions of land occupation and environment pollution caused by accumulation of a great amount of coal slime are avoided.
    (2) The formula is scientific, and the process is simple. The consumption of the 5 coal slime and the ingredients and the proportion of the compound basic fertilizer are determined on the basis of physicochemical property detection results of the sandy soil and the abandoned coal slime, both short-period effects and long-period continuous improvement of the soil quality are considered, and self restoration and good circulation of the soil of the mining area are particularly realized through soil reconstruction and soil ecological system rebuilding. The process is simple and reasonable, and the construction is convenient.
    (3) The popularization and application performance is high. The coal mining center in China has already been transferred to the west area, western mining areas are in an arid and semiarid climatic zone, are dry and rainless, and have a prominent soil desertification phenomenon. The water and soil loss is aggravated through coal mining, so that the soil quality is further reduced. Meanwhile, the safe digestion of coal mining wastes such as the coal slime is also a common problem needing to be faced by the western mining areas. Therefore, the present invention has wide application prospects.
    BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly explain the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings that are used in the embodiments or the description of the prior art will be briefly introduced below. Obviously, it will be apparent to a person skilled in the art that other accompanying drawings can be obtained based on these accompanying drawings without any creative work.
    FIG. 1 is a technical flowchart of the present invention.
    FIG. 2 is a schematic diagram of experimental land parcels subjected to different treatment by technologies of the present invention.
    DETAILED DESCRIPTION The technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention Experiment effect and action mechanism of the invention: By using the technologies of the present invention, sandy soil improving experimental fields are built in Huainan mining group western coal mine investment and management limited company Dongsheng Selian No.2 coal mine, and control land parcels are set. Experiment results show that major quality indexes of improved soil of the experimental fields, and growth conditions and yield of crops are obviously superior to those before improvement and those of the control land parcels.
    A method for improving sandy soil in a mining area by abandoned coal slime provided by the present invention may be used for obviously improving the quality of the sandy soil, and this is based on that: (1) the granularity of coal slime is fine, after the coal slime is mixed with coarse-granularity sandy soil, an original texture of the sandy soil may be improved, the viscosity is increased, and the water holding and fertilizer retaining capability are improved; (2) decomposed organic fertilizer in compound basic fertilizer contains rich nutrient elements, the fertilizer efficiency duration is long, organic matter content in the soil may be increased, and soil microbe reproduction is promoted, so that physicochemical properties and bioactivity of the soil are improved ; (3) soil in an aeolian sand mining area is weak alkaline, humic acids are weak acidic, and humic acid molecules have characteristics of ampholytoid, and may enhance acid and alkali buffering capability of the soil; and in addition, the humic acids and amino acids may promote formation of soil aggregates, improve soil structures, enhance water holding, fertilizer retaining, water-permeable and air-permeable performance of the soil, and promote soil microbe activity; (4) nanometer carbon has a small particle size, a big specific surface area and strong ion adsorption capability, may activate nutrient ions in the soil, and may be absorbed by plants, so that the nutrient utilization rate is improved, and (5) effective bacteria in microbial agents have effects of nitrogen fixation, phosphorus dissolution and potassium decomposition, may promote dissolution and release of insoluble nutrients in the soil, improve the nutrient supply conditions in the soil, and secrete active substances to stimulate growth and development of crops and to enhance drought resistance, saline-alkali tolerance and disease-prevention capability of the crops.
    Embodiment: The method for improving the sandy soil in the mining area by the abandoned coal slime provided by the present invention includes the following steps of: (1) soil properties were determined: through soil granularity determination, if a proportion of particles with the particle size being 0.02 to 2 mm exceeded 88%, the soil was determined to be sandy soil; (2) the abandoned coal slime was spread: the abandoned coal slime being 10 to 15 cm thick was spread and covered on land parcels of the embodiment, and natural sun-curing and air-drying was performed until a water content was 15% to 30%, and a proportion of particles with the particle size being smaller than 0.02 mm in the abandoned coal slime was not less than 50%; (3) compound basic fertilizer was broadcasted: the compound basic fertilizer was uniformly broadcasted according to consumption of 1000 to 1500 kg/mu; the compound basic fertilizer included ingredients of decomposed organic fertilizer, water-soluble amino-humic acid particles, nanometer carbon and microbial agents in the following percentage by weight: 80 to 90% of the decomposed organic fertilizer, 5 to 15% of the water- soluble amino-humic acid particles, 1 to 10% of the nanometer carbon and 0.1 to 2% of the microbial agents; the decomposed organic fertilizer was fertilizer prepared from livestock and poultry excrement, crop straw, weed, fallen leaves and the like through aerobic fermentation and decomposition; the water-soluble amino-humic acid particles was water-soluble granular fertilizer prepared from amino acids and humic acids through compounding; the nanometer carbon was water-soluble spherical nanometer carbon particles with the particle size ranging between 5 nm and 80 nm; the microbial agents were biological products containing efficient active beneficial microbial bacteria, produced by a modern biological technology and suitable for being used in saline-alkali soil in an arid area; active ingredients included one or more of strains in bacillus subtilis, paenibacillus mucilaginosus, bacillus megatherium, bacillus licheniformis, bacillus laterosporus, bacillus mucilaginosus, streptomyces jingyangensis, mycorrhizal fungi, azotobacter vinelandii, bacteria bacillus, vinelandii, aspergillus and actinomycetes, photosynthetic and cetes and an effective viable count was
    200 million/g or above; and each ingredient of the compound basic fertilizer might be singly broadcasted, and might also be broadcasted after being uniformly mixed; an application time of the microbial agents was before 8 o'clock in the morning, after 5 o'clock in the afternoon or on cloudy days without rain;
    (4) ploughing and harrow leveler operation was performed: the ploughing and harrow leveler operation was performed after the broadcasting of the compound basic fertilizer, particularly within 2 hours after the broadcasting of the microbial agents, and a ploughing depth was 25 to 30 cm; deep ploughing was performed by a rotary cultivator; and then levelling was performed by a harrow leveler so that the coal slime, the basic fertilizer and the soil were sufficiently mixed; and
    (5) later-period monitoring management was performed: corn was selected as planting crops; a seed line spacing was 50 cm; spraying irrigation was performed after the seeding at a water irrigation quantity of 100 mm; then, straw covering treatment between ridges was performed so as to reduce soil moisture evaporation, and used straw was semi-decomposed wheat straw stacked in open air for more than 1 year; in a corn growth period, topdressing and irrigation were only performed once in a flare opening period in a topdressing mode of three-nutrient compound fertilizer dressing by forming ditches being 10 cm deep between the ridges, the consumption of compound fertilizer was 35 kg/mu ; irrigation was performed after the top dressing at a water irrigation quantity of 150 mm; and started from germination, soil quality indexes and corn physiological indexes in each growth period were dynamically monitored; in the monitored items, the soil quality indexes included soil granularity, density, volume weight, porosity, water-stable aggregate content, temperature, humidity, Ph value,
    conductivity, salt content, effective nutrient (quick-acting nitrogen phosphorus and potassium) content, harmful element (cadmium, chromium, mercury, copper, plumbum, zinc, arsenic and fluorine) content, soil respiration, total organic carbon quantity, microbial biomass and the like; the temperature, the humidity, the quick-acting nitrogen phosphorus and potassium and the organic carbon were determined in three depths: 0 to
    10 cm, 10 to 20 cm, and 20 to 30 cm; and the crop growth and physiological indexes included plant height, leaf area, photosynthetic rate, chlorophyll content, root system enzymatic activity, yield and the like.
    In the particle composition of the reconstructed soil, if the content of sand particles was higher than 85%, the step 2 to the step 4 were repeated. The particle size of the sand particles ranged between 0.02 mm and 2 mm.
    Comparative Example: The method for improving the sandy soil in the mining area by the abandoned coal slime provided by the present invention includes the following steps of: (1) soil properties were determined: through soil granularity determination, if a proportion of particles with the particle size being 0.02 to 2 mm exceeded 88%, the soil was determined to be sandy soil; and comparative land parcels were respectively marked to be land parcels I, IT and III, (2) the abandoned coal slime was spread: the abandoned coal slime being 10 to 15 cm thick was spread and covered on the land parcel I, and natural sun -curing and air-drying was performed until a water content was 15% to 30%; a proportion of particles with the particle size being smaller than 0.02 mm in the abandoned coal slime was not less than 50%; (3) compound basic fertilizer was broadcasted: the compound basic fertilizer was uniformly broadcasted on the land parcel II according to consumption of 1000 to 1500 kg/mu; the compound basic fertilizer included ingredients of decomposed organic fertilizer, water-soluble amino-humic acid particles, nanometer carbon and microbial agents in the following percentage by weight: 80 to 90% of the decomposed organic fertilizer, 5 to 15% of the water- soluble amino-humic acid particles, 1 to 10% of the nanometer carbon and 0.1 to 2% of the microbial agents; the decomposed organic fertilizer was fertilizer prepared from livestock and poultry excrement, crop straw, weed, fallen leaves and the like through aerobic fermentation and decomposition; the water-soluble amino-humic acid particles were water-soluble granular fertilizer prepared from amino acids and humic acids through compounding; the nanometer carbon was water-soluble spherical nanometer carbon particles with the particle size ranging between 5 nm and 80 nm; the microbial agents were biological products containing efficient active beneficial microbial bacteria, produced by a modern biological technology and suitable for being used in saline-alkali soil in an arid area; active ingredients included one or more of strains in bacillus subtilis, paenibacillus mucilaginosus, bacillus megatherium, bacillus licheniformis, bacillus laterosporus,
    bacillus mucilaginosus, streptomyces jingyangensis, mycorrhizal fungi, azotobacter vinelandii, actinomycetes, photosynthetic bacteria, aspergillus oryzae, lactobacillus flora and the like, and an effective viable count was 200 million/g or above; and the consumption of the compound basic fertilizer was 1000 to 1500 kg/mu, and each ingredient of the compound basic fertilizer might be singly broadcasted, and might also be broadcasted after being uniformly mixed; an application time of the microbial agents was before 8 o'clock in the morning, after 5 o'clock in the afternoon or on cloudy days without rain; (4) ploughing and harrow leveler operation was performed: deep ploughing was performed by a rotary cultivator; and then leveling by a harrow leveler was performed so that the coal slime, the basic fertilizer and the soil were sufficiently mixed; the ploughing and harrow leveler operation was performed after the broadcasting of the compound basic fertilizer, and was particularly performed within 2 hours after the broadcasting of the microbial agents, and a ploughing depth was 25 to 30 cm; and (5) later-period monitoring management was performed: corn was selected as planting crops, a seeding line spacing was 50 cm; spraying irrigation was performed after the seeding at a water irrigation quantity of 100 mm; then, straw covering treatment between ridges was performed so as to reduce soil moisture evaporation, and used straw was semi-decomposed wheat straw stacked in open air for more than 1 year; in a corn growth period, topdressing and irrigation were only performed once in a flare opening period in a topdressing mode of three-nutrient compound fertilizer topdressing by forming ditches being 10 cm deep between the ridges, the consumption of compound fertilizer was 35 kg/mu ; irrigation was performed after the top dressing at a water irrigation quantity of 150 mm; and started from the germination, soil quality indexes and corn physiological indexes in each growth period were dynamically monitored, in the monitored items, the soil quality indexes included soil granularity, density, volume weight, porosity, water-stable aggregate content, temperature, humidity , Ph value, conductivity, salt content, effective nutrient (quick-acting nitrogen phosphorus and potassium) content, harmful element (cadmium, chromium, mercury, copper, plumbum, zinc, arsenic and fluorine) content, soil respiration, total organic carbon quantity , microbial biomass and the like; the temperature, the humidity, the quick-acting nitrogen phosphorus and potassium and the organic carbon were determined in three depths: 0 to
    10 cm, 10 to 20 em, and 20 to 30 cm; and the crop growth and physiological indexes included plant height, leaf area, photosynthetic rate, chlorophyll content, root system enzymatic activity, yield and the like.
    Results show that for the embodiment land parcels treated completely according to the technologies of the present invention, the performance in each aspect of soil water holding and fertilizer retaining capability, microbe activity, corn growth condition, yield and the like is best, and the embodiment land parcels are obviously superior to other land parcels; for the experimental land parcel I only treated by the abandoned coal slime, the soil moisture content is not obviously different from that of the embodiment land parcels, but is obviously higher than those of the land parcel II and the land parcel HI, the reduction speed of the soil nutrient content in the whole corn growth period is obviously lower than that of the land parcel II, and it indicates that the water holding and fertilizer retaining capability of the experimental land parcel I treated by the coal slime is obviously improved; and for the land parcel II only treated by the compound basic fertilizer, in the corn growth early period, the soil nutrient content is obviously higher than those of the land parcel I and the land parcel HI, the corn growth condition is good, but in the corn growth middle period, the soil moisture content of the land parcel II is obviously lower than those of the embodiment land parcel and the land parcel I, the nutrient content is reduced to a degree without obvious difference from the land parcel III, due to water shortage, the corn growth vigour is inferior to that of the land parcel I, and it indicates that the water holding and fertilizer retaining capability of the sandy soil cannot be improved only through fertilization application. Therefore, the method for improving the sandy soil in the mining area by the abandoned coal slime provided by the present invention can be used for obviously improving the water holding and fertilizer retaining capability of the sandy soil, and achieves a good improving effect.
    The basic principles, main features and advantages of the present invention have been shown and described above. A person skilled in the art should understand that the present invention is not limited by the foregoing embodiments. What is described in the above embodiments and the description merely illustrates the principles of the present invention. Various changes and improvements fall within the scope of the claimed invention.
    权利要求:
    Claims (9)
    [1]
    A method for improving the sandy bottom in a mining area using sludge from waste coal, comprising the steps of: Step 1: determining soil properties, comprising performing a soil particle size analysis to determine whether the soil is sandy; Step 2: Spreading the waste coal sludge, comprising spreading the waste coal sludge with a thickness of 10-15 cm on the plot to be improved and air drying to the moisture content of 15%-30%; Step 3: applying the basic compound fertilizer, comprising applying the basic compound fertilizer evenly in an amount of 1,000-1,500 kg per mu; Step 4: Plowing and raking operation, which includes deep plowing with a rotary tiller and then leveling with the rake so that the slime, base fertilizer and soil are completely mixed; Step 5: Subsequent maintenance, including after planting appropriate crops, scientifically irrigate, cover with straw or mulch, quickly apply rational fertilizers, and perform long-term dynamic monitoring on indicators such as reconstituted soil particle size, fast-acting nutrient content, and crop growth and physiological indicators.
    [2]
    Method for improving the sandy soil in a mining area using sludge from waste coal according to claim 1, characterized in that the determination criterion of the sandy soil is that the proportion of soil particles with a particle size of 0.02-2 mm is 85%-100 %.
    [3]
    Method for improving the sandy bottom in a mining area using waste coal sludge according to claim 1, characterized in that the proportion of particles with a particle size smaller than 0.02 mm in the waste coal sludge is not less than 50%.
    [4]
    Method for improving the sandy soil in a mining area using waste coal sludge according to claim 1, characterized in that the composition and weight ratio of the basic compound fertilizer are: 80%-90% for the decomposed organic fertilizer, 5%- 15% for water-soluble aminohumic acid particles, 1%-10% for nanocarbon and 0.1%-2% for microbial inoculants.
    [5]
    The method of improving the sandy soil in a mining area using waste coal sludge according to claim 4, characterized in that the decomposed organic fertilizer is a kind of fertilizer made from animal manure, crop stems, weeds, fallen leaves, etc. ., and is aerobically fermented and decomposed. The water-soluble amino acid humic acid particles are water-soluble granular fertilizers composed of amino acids and humic acid. The nanocarbon is water-soluble spherical nanocarbon particles with a particle size of 5-80 nm. The microbial agent is a biological product containing highly effective beneficial microbial bacteria suitable for use in saline areas in arid areas produced by modern biotechnology, and the active ingredients are one or more bacteria of bacillus subtilis, jelly-like bacillus, bacillus megaterium , bacillus licheniformis, bacillus lateralis, gliocladium, streptomyces jingyangensis, mycorrhiza fungi, brown nitrogen-fixing bacteria, actinomycetes, photosynthetic bacteria, aspergillus oryzae, lactic acid bacteria, etc., and the number of effective living bacteria is 2 100 million/g or more.
    [6]
    Method for improving the sandy soil in a mining area using waste coal sludge according to claim 1 or 4, characterized in that each component of the basic compound fertilizer can be applied separately or mixed and applied together, and the application time of the microbial inoculum is before 8 a.m., after 5 p.m. or on a cloudy day with no rain.
    [7]
    Method for improving the sandy soil in a mining area using waste coal sludge according to claim 1, characterized in that the plowing and raking are carried out after the application of compound fertilizer, especially within 2 hours after the application of microbial inoculants, and the plowing depth is 25-30 cm.
    [8]
    A method for improving the sand bed in a mining area using waste coal sludge according to claim 1 or 2, characterized in that steps 2 to 4 are performed repeatedly if the content of sand particles in the particle composition of the reconstructed bed is greater than 85%.
    [9]
    Method for improving the sand bed in a mining area using waste coal sludge according to claim 8, characterized in that the particle size range of the sand particles is 0.02-2 mm.
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    同族专利:
    公开号 | 公开日
    CN111116276A|2020-05-08|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    CN104186058B|2014-08-21|2016-06-22|深圳市翠绿洲环境艺术有限公司|A kind of prone soil modification method|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    CN202010058313.8A|CN111116276A|2020-01-19|2020-01-19|Method for improving sandy soil of mining area by using waste coal slime|
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