Method for cultivating high-nutrient soil with potassium feldspar powder squeezed mud

Abstract

The invention discloses a method for cultivating high-nutrient soil by potassium feldspar powder squeezed mud, which comprises the following steps: (1) mixing biomass carbon powder with a polycarboxylic acid water reducer diluent, and drying to obtain modified carbon powder; (2) uniformly mixing the modified carbon powder, calcium silicate and / or pseudo-wollastonite powder, a binder and water, granulating the obtained mixture, and drying to obtain core particles; and (3) uniformly mixing ardealite powder, biomass powder, silica fume and water to form slurry, and coating the surface of the core particle with the slurry to obtain the multifunctional particle. And (4) taking the following raw materials: potassium feldspar powder squeezed mud, bamboo fibers, pelelith particles, a potassium bacteria solution and matured compost, thereby obtaining the multifunctional particles. The raw materials are evenly mixed and then cultivated in a humid environment, and the cultivation method is obtained. According to the invention, the alkalinity and heavy metal content of the potassium feldspar powder pressed mud are reduced, the fertility is improved, and the potassium feldspar powder pressed mud is more beneficial to the growth of plants, so that the resource utilization of the industrial solid waste potassium feldspar powder pressed mud is promoted.

Description

Technical Field

[0001] The present invention relates to the field of solid waste resource utilization, and particularly to a method for cultivating high-nutrient soil with potassium feldspar powder press mud. Background Art

[0002] Disclosing the information of this background art section is only intended to enhance the overall understanding of the present invention, and it is not necessarily regarded as an admission or an implication in any form that this information constitutes the prior art already known to those of ordinary skill in the art.

[0003] As a by-product rich in various minerals and nutrient elements generated after processes such as crushing, grinding, and flotation during the lithium mica beneficiation process, the large accumulation of potassium feldspar powder press mud not only occupies land resources but also may pose a potential threat to the surrounding environment. With the increasing global shortage of mineral resources and the enhancement of environmental protection awareness, how to realize the resource utilization of such by-products has become one of the urgent problems to be solved in the current mining industry. Although potassium feldspar powder press mud can be used in ceramic production, with the saturation of the national construction industry and the tightening of low-carbon policies, as a high-energy-consuming industry, the output of ceramics has also decreased significantly.

[0004] As an important part of traditional plant cultivation methods, soil cultivation technology still occupies a place in modern agricultural production. This technology creates favorable conditions for the growth and development of plants by improving the soil environment and increasing soil fertility. However, on the one hand, due to inevitable factors during the processing, the obtained potassium feldspar powder press mud is alkaline, which is not conducive to the survival of microorganisms and cannot be directly used as plant soil. On the other hand, potassium feldspar powder press mud usually contains harmful heavy metal elements such as lead (Pb), cadmium (Cd), and chromium (Cr), which further limits its application as plant soil for potassium feldspar powder press mud. Summary of the Invention

[0005] In view of the above problems, the present invention discloses a method for cultivating high-nutrient soil with potassium feldspar powder press mud, which not only reduces the alkalinity and heavy metal content of potassium feldspar powder press mud but also improves its fertility, making it more conducive to plant growth, thereby facilitating the resource utilization of this industrial solid waste, potassium feldspar powder press mud. Specifically, the technical solution of the present invention is as follows.

[0006] A method for cultivating high-nutrient soil with potassium feldspar powder press mud, comprising the following steps: (1) Adding a high-efficiency polycarboxylate water-reducing agent mother liquor to water and stirring evenly to form a dilution solution for standby.

[0007] (2) Mixing biomass carbon powder with the dilution solution and then performing ultrasonic oscillation treatment. After completion, separating the solid product and drying it to obtain modified carbon powder for standby.

[0008] (3) Mix the modified toner, wollastonite and / or pseudowollastonite powder, binder, and water evenly, and then granulate the obtained mixture. After drying, obtain core particles for standby.

[0009] (4) Mix phosphogypsum powder, biomass powder, silica fume, and water to form a slurry. Then add this slurry to the core particles and roll-coat them. After completion, air-dry the obtained particulate matter to obtain multifunctional particles for standby.

[0010] (5) Take the following raw materials: potassium feldspar powder pressed mud, bamboo fiber, volcanic stone particles, potassium-dissolving bacteria liquid, mature compost, and the multifunctional particles. Mix all the raw materials evenly and cultivate them in a humid environment, and stir regularly. After reaching the predetermined cultivation time, obtain potassium feldspar powder pressed mud cultivated high-nutrient soil.

[0011] Further, in step (1), the mass fraction of the high-performance polycarboxylate water-reducing agent mother liquor in the dilution is 30 - 45%.

[0012] Further, in step (2), the ratio of the biomass carbon powder to the dilution is 1 g : 2 - 4 ml. Optionally, the fineness of the biomass carbon powder is 10 - 30 mesh.

[0013] Further, in step (2), the preparation raw materials of the biomass carbon powder include at least one of straw, wood, coconut shell, rice straw, etc. Optionally, the time of the ultrasonic oscillation treatment is not less than 15 min.

[0014] Further, in step (2), the drying temperature is 80 - 110 °C, and dry at this temperature until the solid product no longer changes.

[0015] Further, in step (3), the mass ratio of the modified toner, wollastonite and / or pseudowollastonite powder, and binder is 1 - 1.8 : 2.5 - 3.3 : 0.42 - 0.55. Add the water according to the ratio of the moisture content of 15 - 22% in the mixture. Optionally, the fineness of the wollastonite and / or pseudowollastonite powder is 400 - 500 mesh.

[0016] Further, in step (3), the binder includes at least one of hydroxyethyl cellulose, hydroxypropyl methyl cellulose, etc.

[0017] Further, in step (3), the drying temperature is 65 - 80 °C, and the drying time is 40 - 60 min. Optionally, the particle size of the core particles is 5 - 15 mm.

[0018] Further, in step (4), the mass ratio of the phosphogypsum powder, biomass powder, and silica fume is 1 : 0.5 - 0.7 : 1.5 - 2.2, and the solid content in the slurry is 50 - 62 wt.%.

[0019] Further, in step (4), the biomass powder includes at least one of straw powder, wood powder, rice straw powder, etc. Optionally, the fineness of the biomass powder is 80 - 150 mesh.

[0020] Further, in step (4), the ratio of the core particles to the slurry is 1 g : 2 - 3.5 ml.

[0021] Further, in step (5), in the raw materials, bamboo fiber is 1.5 - 4 wt.%, volcanic stone particles are 6 - 10 wt.%, decomposed compost is 1 - 3 wt.%, multifunctional particles are 15 - 21 wt.%, and the balance is the potassium feldspar powder press mud. The ratio of the potassium - dissolving bacteria liquid to the potassium feldspar powder press mud is 10 - 20 ml : 100 g.

[0022] Further, in step (5), the viable count of the potassium - dissolving bacteria liquid is not less than 2×10 10 cfu / g.

[0023] Further, in step (5), the length of the bamboo fiber is 5 - 30 mm. Optionally, the particle size distribution of the volcanic stone particles is between 0.5 - 2 mm.

[0024] Further, in step (5), the relative humidity of the humid environment is 60 - 70%.

[0025] Further, in step (5), the predetermined cultivation time is 80 - 100 days. Optionally, the turning and mixing are carried out every 15 - 20 days.

[0026] Compared with the prior art, the present invention has at least the following beneficial technical effects: On the one hand, the fineness of the potassium feldspar powder pressed mud is generally between 100 and 300 μm, showing a delicate mud-like form. The soil structure formed by it is too dense, prone to hardening, with poor water permeability and air permeability, which is not conducive to the growth, respiration of plant roots and the survival of potassium-dissolving bacteria. The present invention effectively improves the soil structure and increases its air permeability through bamboo fibers and volcanic stone particles. Moreover, after the bamboo fibers gradually decay, they can also increase the soil fertility. On the other hand, the present invention promotes the dissolution of minerals in the potassium feldspar powder pressed mud by the acidic substances or organic acids secreted by the potassium-dissolving bacteria solution to release mineral elements such as potassium ions, thereby increasing the potassium ion content in the soil for plants to absorb. The mature compost can not only supplement organic matter and improve soil fertility, but also enrich the microbial community in the soil. At the same time, the present invention further alleviates the problems of the potassium feldspar powder pressed mud being alkaline and containing heavy metals through the prepared multifunctional particles. For this purpose, the present invention prepares core particles with polycarboxylate superplasticizer-modified biomass carbon powder, wollastonite and / or pseudowollastonite powder, etc., and coats a coating layer formed by phosphogypsum powder and biomass powder on its surface. During the process of adding it to the potassium feldspar powder pressed mud for soil cultivation, the phosphogypsum forms phosphate precipitates by reacting with heavy metal ions by releasing phosphate radicals, so that the content of free heavy metal ions in the soil can be rapidly reduced in the initial stage. At the same time, the hydrogen ions released by the phosphogypsum help to reduce the alkalinity of the potassium feldspar powder pressed mud. As the cultivation process progresses, the biomass powder in the coating layer decays to form a porous structure. The modified carbon powder therein uses its adsorption performance to adsorb heavy metal ions. At the same time, since the polycarboxylate superplasticizer loaded on the modified carbon powder is rich in carboxyl groups, on the one hand, the hydrogen ions released by it can further reduce the alkalinity of the potassium feldspar powder pressed mud, and on the other hand, the formed carboxylate radicals can capture a large amount of heavy metal ions to form chelates and store them in the core, thereby reducing the content of heavy metal ions released by the potassium feldspar powder pressed mud under the action of potassium-dissolving bacteria in the later stage. Further, the wollastonite and / or pseudowollastonite in the core use the carbon dioxide generated by the microbial metabolism in the mature compost for carbonization reaction, and the formed silica gel can further solidify the chelates of the heavy metal ions, which helps to prevent them from returning to the soil again. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The specification drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. Hereinafter, the embodiments of the present invention will be described in detail with reference to the drawings, in which: Figure 1 It is a sample diagram of the multifunctional particles prepared in Example 1 below.

[0028] Figure 2 It is a test diagram of the organic matter content in the soil prepared in Example 1 below.

[0029] Figure 3 Sample diagram of the multifunctional particles prepared for Example 2 below.

[0030] Figure 4 Test diagram of the organic matter content in the soil prepared for Example 2 below.

[0031] Figure 5 Sample diagram of the multifunctional particles prepared for Example 3 below.

[0032] Figure 6 Test diagram of the organic matter content in the soil prepared for Example 3 below.

[0033] Figure 7 Test diagram of the organic matter content in the soil prepared for Example 4 below.

[0034] Figure 8 Sample diagram of the multifunctional particles prepared for Example 5 below.

[0035] Figure 9 Test diagram of the organic matter content in the soil prepared for Example 5 below.

[0036] Figure 10 Sample diagram of the multifunctional particles prepared for Example 6 below.

[0037] Figure 11 Test diagram of the organic matter content in the soil prepared for Example 6 below.

[0038] Figure 12 Test diagram of the organic matter content in the soil prepared for Example 7 below. Detailed implementation manners

[0039] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. For the experimental methods without specific conditions indicated in the following embodiments, they are usually carried out under conventional conditions or according to the conditions recommended by the manufacturer.

[0040] Unless otherwise defined, all professional and scientific terms used herein have the same meaning as those familiar to persons skilled in the art. The reagents or raw materials used in the present invention can be obtained through conventional channels. Unless otherwise specified, the reagents or raw materials used in the present invention are used in the conventional manner in the art or according to the product instructions. In addition, any methods and materials similar or equivalent to the recorded content can be applied to the method of the present invention.

[0041] Example 1 A method for cultivating high-nutrient soil with potassium feldspar powder pressed mud, comprising the following steps: (1) Add the high-efficiency polycarboxylate water-reducing agent mother liquor into water and stir evenly to form a diluted solution with a mass fraction of 40% for later use.

[0042] (2) The 25-mesh straw carbon powder and the diluent are mixed at a solid-liquid ratio of 1 g:3 ml, and then ultrasonically shaken for 20 minutes. After the mixture is completed, the solid product is filtered out, placed in an oven, heated to 100° C., and dried until the solid product no longer changes, thereby obtaining modified carbon powder for later use.

[0043] (3) The modified carbon powder, 400-mesh calcite powder and hydroxymethyl cellulose are mixed in a mass ratio of 1.6:3:0.5 and stirred evenly. Then, water is added according to a moisture content of 18% and stirred evenly. The obtained granules are placed in an oven, heated to 70°C and dried for 60 minutes. Granules with a particle size of 5-10 mm are sieved out as core particles for later use.

[0044] (4) Phosphogypsum powder, 150-mesh straw powder, and silica fume are mixed in a mass ratio of 1:0.6:2 and stirred evenly, and then water is added and stirred evenly to form a slurry with a solid content of 60 wt.%. Then, the slurry is added to the core particles and rolled to coat them, and the ratio of the two is 1 g:3 ml. After completion, the obtained particles are naturally dried in a cool place for 3 days to obtain multifunctional particles (such as Figure 1 as shown), for standby use.

[0045] (5) Take the following raw materials in the following proportions: 70.5 g of potassium feldspar powder pressed mud, 3.5 g of bamboo fiber, 7 g of volcanic rock particles, 10 ml of potassium-dissolving bacteria liquid, 2 g of mature compost, and 17 g of the multifunctional particles. Among them: the pH of the potassium feldspar powder pressed mud is 7.84, the length of the bamboo fiber is distributed between 5 and 30 mm, the particle size of the volcanic rock particles is distributed between 0.5 and 2 mm, and the number of live bacteria (Bacillus subtilis) in the potassium-dissolving bacteria liquid is 3.3×10 10 cfu / g. The above raw materials are mixed in proportion and stirred evenly, and then placed in a humid environment with a temperature set at 25-28°C and a relative humidity set at 65-70% for cultivation, and stirred every 20 days. After the predetermined cultivation time (100 days), potassium feldspar powder squeezed mud is obtained for cultivating high-nutrient soil.

[0046] The organic matter (e.g. Figure 2 As shown), effective phosphorus, quick-acting potassium and effective nitrogen content. The pH value of the soil and the removal rate of total heavy metal ions (including Pb, Cd, Cr, Ni, Cu) were tested. Among them, the removal rate is the ratio of the heavy metal ion leaching amount in the soil prepared in this embodiment to the heavy metal ion leaching amount in the original potassium feldspar powder squeezed mud. The results are shown in the following table: .

[0047] Example 2 A method for cultivating high-nutrient soil with potassium feldspar powder pressed mud, comprising the following steps: (1) Add the superplasticizer polycarboxylate mother liquor to water and stir evenly to form a 30% mass fraction dilution, and set aside.

[0048] (2) Mix the 10-mesh wood charcoal powder with the dilution at a solid-liquid ratio of 1 g: 4 ml, and then perform ultrasonic oscillation treatment for 15 min. After completion, filter out the solid product, place it in an oven and heat it to 80 °C until the solid product no longer changes, to obtain modified charcoal powder, and set aside.

[0049] (3) Mix the modified charcoal powder, wollastonite powder with a fineness of 400 mesh, and hydroxyethyl cellulose in a mass ratio of 1: 2.5: 0.42, stir evenly, then add water according to a moisture content of 15% and stir evenly to granulate. Place the obtained particulate matter in an oven and heat it to 80 °C for drying for 40 min, and screen out particulate matter with a particle size of 10-15 mm as the core particles, and set aside.

[0050] (4) Mix the phosphogypsum powder, wood powder with a fineness of 80 mesh, and silica fume in a mass ratio of 1: 0.7: 2.2, stir evenly, and then add water and stir evenly to form a slurry with a solid content of 50 wt.%. Then add this slurry to the core particles and roll-coat them, and the ratio of the two is 1 g: 2 ml. After completion, let the obtained particulate matter dry naturally in a cool place for 3 days to obtain the multifunctional particles (as Figure 3 shown), and set aside.

[0051] (5) Take the following raw materials: 72.5 g of potassium feldspar powder pressed mud, 1.5 g of bamboo fiber, 10 g of volcanic stone particles, 7.25 ml of potassium-solubilizing bacteria solution, 1 g of composted manure, and 15 g of the multifunctional particles. Among them: the pH of the potassium feldspar powder pressed mud is 7.84, the length of the bamboo fiber is distributed between 5-30 mm, the particle size of the volcanic stone particles is distributed between 0.5-2 mm, and the viable bacteria (Bacillus mucilaginosus) number of the potassium-solubilizing bacteria solution is 3.7×10 10 cfu / g. Mix the above raw materials in proportion and stir evenly, then place them in a humid environment with a temperature set at 25-28 °C and a relative humidity set at 60-65% for cultivation, and stir once every 15 days. After reaching the predetermined cultivation time (90 days), potassium feldspar powder pressed mud cultivated high-nutrient soil is obtained.

[0052] Use the same method as in Example 1 above to test the organic matter in the soil prepared in this example (as Figure 4The content of available phosphorus, available potassium, available nitrogen, pH value, and the removal rate of total heavy metal ions are as shown in the following table: .

[0053] Example 3 A method for cultivating high-nutrient soil with potassium feldspar powder pressing mud, comprising the following steps: (1) Add the mother liquor of high-efficiency polycarboxylate water reducer to water and stir evenly to form a dilution with a mass fraction of 45%, and set aside.

[0054] (2) Mix 30-mesh coconut shell carbon powder with the above dilution at a solid-liquid ratio of 1 g: 2 ml, and then perform ultrasonic oscillation treatment for 20 min. After completion, filter out the solid product, place it in an oven, heat it to 110 °C, and dry it until the solid product no longer changes to obtain modified carbon powder, and set aside.

[0055] (3) Mix the modified carbon powder, wollastonite powder with a fineness of 500 meshes, and hydroxypropyl methylcellulose in a mass ratio of 1.8: 3.3: 0.55, stir evenly, then add water according to a moisture content of 22% and stir evenly to granulate. Place the obtained particulate matter in an oven, heat it to 65 °C, and dry it for 50 min. Screen out the particulate matter with a particle size of 10 - 15 mm as the core particles, and set aside.

[0056] (4) Mix phosphogypsum powder, 80-mesh wood powder, and silica fume in a mass ratio of 1: 0.5: 1.5, stir evenly, and then add water and stir evenly to form a slurry with a solid content of 50 wt.%. Then add this slurry to the core particles and roll-coat them, with a ratio of 1 g: 3.5 ml. After completion, let the obtained particulate matter air-dry naturally in a shady place for 3 days to obtain the multifunctional particles (as Figure 5 shown), and set aside.

[0057] (5) Take the following raw materials: 66 g of potassium feldspar powder pressing mud, 4 g of bamboo fiber, 6 g of volcanic stone particles, 13.2 ml of potassium-solubilizing bacteria solution, 3 g of decomposed compost, and 21 g of the multifunctional particles. Among them: the pH of the potassium feldspar powder pressing mud is 7.84, the length of the bamboo fiber is distributed between 5 - 30 mm, the particle size of the volcanic stone particles is distributed between 0.5 - 2 mm, and the viable bacteria (Bacillus mucilaginosus) number in the potassium-solubilizing bacteria solution is 2.1×10 10 cfu / g. Mix the above raw materials in proportion, stir evenly, and then place them in a humid environment with a temperature set at 25 - 28 °C and a relative humidity set between 60 - 35% for cultivation, and turn them over every 16 days. After reaching the predetermined cultivation time (80 days), high-nutrient soil cultivated with potassium feldspar powder pressing mud is obtained.

[0058] The organic matter in the soil prepared in this example was tested by the same method as in Example 1 above (such as Figure 6 shown), available phosphorus, available potassium, available nitrogen content, pH value, and total heavy metal ion removal rate. The results are as described in the following table: .

[0059] Example 4 A method for cultivating high-nutrient soil with potassium feldspar powder pressed mud, comprising the following steps: Take the following raw materials in proportion: 70.5 g of potassium feldspar powder pressed mud, 3.5 g of bamboo fiber, 7 g of volcanic stone particles, 10 ml of potassium-dissolving bacteria solution, and 2 g of decomposed compost. Among them: the pH of the potassium feldspar powder pressed mud is 7.84, the length of the bamboo fiber is distributed between 5 and 30 mm, the particle size of the volcanic stone particles is distributed between 0.5 and 2 mm, and the number of live bacteria (Bacillus mucilaginosus) in the potassium-dissolving bacteria solution is 3.3×10 10 cfu / g. Mix the above raw materials in proportion and stir evenly, then place them in a humid environment with a temperature set at 25-28°C and a relative humidity set at 65-70% for cultivation, and turn them over and stir once every 20 days. After reaching the predetermined cultivation time (100 days), high-nutrient soil cultivated with potassium feldspar powder pressed mud is obtained.

[0060] The organic matter in the soil prepared in this example was tested by the same method as in Example 1 above (such as Figure 7 shown), available phosphorus, available potassium, available nitrogen content, pH value, and total heavy metal ion removal rate. The results are as described in the following table: .

[0061] Example 5 A method for cultivating high-nutrient soil with potassium feldspar powder pressed mud, comprising the following steps: (1) Mix 30-mesh coconut shell carbon powder, 500-mesh wollastonite powder, and hydroxypropyl methylcellulose in a mass ratio of 1.8:3.3:0.55, stir evenly, then add water according to a moisture content of 22% and stir evenly to granulate. Place the obtained particles in an oven and heat to 65°C for drying for 50 min, and screen out particles with a particle size of 10-15 mm as core particles for standby.

[0062] (2) Mix phosphogypsum powder, 80-mesh wood powder, and silica fume in a mass ratio of 1:0.5:1.5, stir evenly, and then add water and stir evenly to form a slurry with a solid content of 50 wt.%. Then add this slurry to the core particles and roll-coat them, with a ratio of 1 g:3.5 ml. After completion, let the obtained particles air-dry naturally in a cool place for 3 days to obtain multifunctional particles (such as Figure 8 shown), for standby.

[0063] (3) Take raw materials in the following proportions: 66 g of potassium feldspar powder pressed mud, 4 g of bamboo fiber, 6 g of volcanic stone particles, 13.2 ml of potassium-solubilizing bacteria solution, 3 g of mature compost, and 21 g of the multifunctional particles. Among them: the pH of the potassium feldspar powder pressed mud is 7.84, the length of the bamboo fiber is distributed between 5 and 30 mm, the particle size of the volcanic stone particles is distributed between 0.5 and 2 mm, and the number of viable bacteria (Bacillus mucilaginosus) in the potassium-solubilizing bacteria solution is 2.1×10 10 cfu / g. Mix the above raw materials in proportion and stir evenly, then place them in a humid environment with the temperature set at 25 - 28°C and the relative humidity set between 60 - 35% for cultivation, and turn them over and stir once every 16 days. After reaching the predetermined cultivation time (80 days), potassium feldspar powder pressed mud cultivated high-nutrient soil is obtained.

[0064] Use the same method as in Example 1 above to test the organic matter (as Figure 9 shown), available phosphorus, available potassium, available nitrogen content, pH value, and total heavy metal ion removal rate in the soil prepared in this example. The results are as described in the following table: .

[0065] Example 6 A method for cultivating high-nutrient soil with potassium feldspar powder pressed mud, comprising the following steps: (1) Add the high-performance polycarboxylate water reducer mother liquor to water and stir evenly to form a 30% mass fraction dilution, and set aside.

[0066] (2) Mix the 10-mesh wood charcoal powder and the dilution in a liquid-solid ratio of 1 g: 4 ml, and perform ultrasonic oscillation treatment for 15 min. After completion, filter out the solid product, place it in an oven and heat it to 80°C until the solid product no longer changes to obtain modified charcoal powder, and set aside.

[0067] (3) Mix the modified charcoal powder and hydroxyethyl cellulose in a mass ratio of 3.5: 0.42 and stir evenly, then add water according to a moisture content of 15% and stir evenly to granulate. Place the obtained particulate matter in an oven and heat it to 80°C for 40 min, and screen out particulate matter with a particle size of 10 - 15 mm as the core particles, and set aside.

[0068] (4) Mix phosphogypsum powder, 80-mesh wood powder, and silica fume in a mass ratio of 1: 0.7: 2.2 and stir evenly, then add water and stir evenly to form a slurry with a solid content of 50 wt.%. Then add this slurry to the core particles and roll-coat them, with a ratio of 1 g: 2 ml. After completion, let the obtained particulate matter air-dry naturally in a shady place for 3 days to obtain the multifunctional particles (as Figure 10 shown), and set aside.

[0069] (5) Take raw materials in the following proportions: 72.5 g of potassium feldspar powder pressed mud, 1.5 g of bamboo fiber, 10 g of volcanic stone particles, 7.25 ml of potassium-dissolving bacteria solution, 1 g of decomposed compost, and 15 g of the multifunctional particles. Among them: the pH of the potassium feldspar powder pressed mud is 7.84, the length of the bamboo fiber is distributed between 5 and 30 mm, the particle size of the volcanic stone particles is distributed between 0.5 and 2 mm, and the number of viable bacteria (Bacillus mucilaginosus) in the potassium-dissolving bacteria solution is 3.7×10 10 cfu / g. Mix the above raw materials in proportion and stir evenly, then place them in a humid environment with the temperature set at 25-28 °C and the relative humidity set at 60-65% for cultivation, and turn them over every 15 days. After reaching the predetermined cultivation time (90 days), potassium feldspar powder pressed mud cultivated high-nutrient soil is obtained.

[0070] Use the same method as in Example 1 above to test the organic matter (as Figure 11 shown), available phosphorus, available potassium, available nitrogen content, pH value, and total heavy metal ion removal rate in the soil prepared in this example. The results are as described in the following table: .

[0071] Example 7 A method for cultivating high-nutrient soil with potassium feldspar powder pressed mud, comprising the following steps: Take raw materials in the following proportions: 70.5 g of potassium feldspar powder pressed mud, 3.5 g of bamboo fiber, 7 g of volcanic stone particles, 10 ml of potassium-dissolving bacteria solution, and 17 g of the multifunctional particles prepared in Example 1 above. Among them: the pH of the potassium feldspar powder pressed mud is 7.84, the length of the bamboo fiber is distributed between 5 and 30 mm, the particle size of the volcanic stone particles is distributed between 0.5 and 2 mm, and the number of viable bacteria (Bacillus mucilaginosus) in the potassium-dissolving bacteria solution is 3.3×10 10 cfu / g. Mix the above raw materials in proportion and stir evenly, then place them in a humid environment with the temperature set at 25-28 °C and the relative humidity set at 65-70% for cultivation, and turn them over every 20 days. After reaching the predetermined cultivation time (100 days), potassium feldspar powder pressed mud cultivated high-nutrient soil is obtained.

[0072] Use the same method as in Example 1 above to test the organic matter (as Figure 12 shown), available phosphorus, available potassium, available nitrogen content, pH value, and total heavy metal ion removal rate in the soil prepared in this example. The results are as described in the following table: .

[0073] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for cultivating high-nutrient soil with potassium feldspar powder pressed mud, characterized in that, It includes the following steps: (1) Add the high-efficiency polycarboxylate water-reducing agent mother liquor to water and stir evenly to form a dilution solution for standby; (2) Mix the biomass carbon powder with the dilution solution and then perform ultrasonic oscillation treatment. After completion, separate the solid product and dry it to obtain the modified carbon powder for standby; (3) Mix the modified carbon powder, wollastonite and / or pseudowollastonite powder, binder, and water evenly, and then granulate the obtained mixture. After drying, obtain the core particles for standby; (4) Mix phosphogypsum powder, biomass powder, silica fume, and water evenly to form a slurry. Then add this slurry to the core particles and perform rolling coating. After completion, air-dry the obtained particulate matter to obtain the multifunctional particles for standby; (5) Take the following raw materials: potassium feldspar powder press mud, bamboo fiber, volcanic stone particles, potassium-dissolving bacteria liquid, mature compost, and the multifunctional particles; mix the raw materials evenly and cultivate them in a humid environment, and stir regularly. After reaching the predetermined cultivation time, obtain the potassium feldspar powder press mud cultivated high-nutrient soil.

2. The method for cultivating high-nutrient soil with potassium feldspar powder pressed mud according to claim 1, characterized in that, In step (1), the mass fraction of the high-efficiency polycarboxylate water-reducing agent mother liquor in the dilution solution is 30-45%.

3. The method for cultivating high-nutrient soil with potassium feldspar powder pressing mud according to claim 1, wherein In step (2), the ratio of the biomass carbon powder to the dilution solution is 1 g: 2-4 ml; Optionally, in step (2), the fineness of the biomass carbon powder is 10-30 mesh; Optionally, in step (2), the preparation raw materials of the biomass carbon powder include at least one of straw, wood, coconut shell, and rice straw; Optionally, in step (2), the time of the ultrasonic oscillation treatment is not less than 15 min; Optionally, in step (2), the drying temperature is 80-110 °C, and it is dried at this temperature until the solid product no longer changes.

4. The method for cultivating high-nutrient soil with potassium feldspar powder pressed mud according to claim 1, characterized in that, In step (3), the mass ratio of the modified carbon powder, wollastonite and / or pseudowollastonite powder, and binder is 1-1.8: 2.5-3.3: 0.42-0.55; add the water according to the ratio of the water content of 15-22% in the mixture; Optionally, in step (3), the fineness of the wollastonite and / or pseudowollastonite powder is 400-500 mesh; 5. The method for cultivating high-nutrient soil with potassium feldspar powder pressed mud according to claim 1, characterized in that, In step (3), the binder includes at least one of hydroxymethyl cellulose, hydroxyethyl cellulose, and hydroxypropyl methyl cellulose; Optionally, in step (3), the drying temperature is 65-80 °C, and the drying time is 40-60 min; Optionally, in step (3), the particle size of the core particles is 5-15 mm; 6. The method for cultivating high-nutrient soil with potassium feldspar powder pressed mud according to claim 1, characterized in that, In step (4), the mass ratio of the phosphogypsum powder, biomass powder, and silica fume is 1: 0.5-0.7: 1.5-2.2, and the solid content in the slurry is 50-62 wt.%; Optionally, in step (4), the biomass powder includes at least one of straw powder, wood powder, and rice straw powder; Optionally, in step (4), the fineness of the biomass powder is 80-150 mesh; 7. The method for cultivating high-nutrient soil with potassium feldspar powder pressed mud according to claim 1, characterized in that, In step (4), the ratio of the core particles to the slurry is 1 g: 2-3.5 ml.

8. The method for cultivating high-nutrient soil with potassium feldspar powder pressed mud according to claim 1, characterized in that, In step (5), the bamboo fiber in the raw materials is 1.5-4 wt.%, the volcanic stone particles are 6-10 wt.%, the decomposed compost is 1-3 wt.%, the multifunctional particles are 15-21 wt.%, and the balance is the potassium feldspar powder pressed mud; the ratio of the potassium-dissolving bacteria liquid to the potassium feldspar powder pressed mud is 10-20 ml: 100 g.

9. The method for cultivating high-nutrient soil with potassium feldspar powder pressed mud according to any one of claims 1-8, characterized in that, In step (5), the viable count of the potassium-solubilizing bacteria liquid is not less than 2×10 10 cfu / g; Optionally, in step (5), the length of the bamboo fiber is 5-30 mm; Optionally, in step (5), the particle size of the volcanic stone particles is distributed between 0.5-2 mm.

10. The method for cultivating high-nutrient soil with potassium feldspar powder pressing mud according to any one of claims 1-8, characterized in that, In step (5), the relative humidity of the humid environment is 60-70%; Optionally, in step (5), the predetermined cultivation time is 80-100 days; Optionally, in step (5), the stirring is carried out every 15-20 days.

Images