Formula for producing potassium fulvate-containing calcium magnesium phosphate fertilizer and preparation method of potassium fulvate-containing calcium magnesium phosphate fertilizer

Abstract

The invention discloses a formula for producing a potassium fulvate-containing calcium magnesium phosphate fertilizer and a preparation method, and belongs to the field of chemical fertilizer production. The invention aims to solve the problems of slow release of available phosphorus and low nutrient utilization rate of the traditional calcium magnesium phosphate fertilizer and the problems of unbalanced ratio, uncomfortable dosage form and the like in the existing compounding technology. The formula comprises the following components in percentage by weight: 97.5%-99.5% of the calcium-containing magnesium phosphate fertilizer, 0.4%-2.0% of biochemical potassium fulvate and 0.1%-0.5% of an activating auxiliary agent, and the activating auxiliary agent is a compound of citric acid and aspartic acid or glutamic acid. The preparation process comprises the four steps of raw material pretreatment, mixing and grinding, aging and curing and screening and packaging, the activity of biochemical potassium fulvate is activated through an activating auxiliary, and a stable nutrition system is formed through superfine grinding and aging reaction. The product is solid powder, is low in cost, is convenient to transport and store, is suitable for various soil and planting scenes, can significantly improve the release rate of available phosphorus and the nutrient utilization rate, improve the soil structure and avoid salinization, and can optimize the soil micro-ecology and promote the growth and yield increase of crops after long-term application.

Description

Technical Field

[0001] This invention relates to the field of fertilizer production, and in particular to a formula and preparation method for producing potassium humate-containing calcium magnesium phosphate fertilizer. Background Technology

[0002] Calcium magnesium phosphate fertilizer is an important multi-element fertilizer, rich in nutrients such as phosphorus, calcium, magnesium, and silicon. It can improve the physical and chemical properties of soil and promote crop growth. However, traditional calcium magnesium phosphate fertilizer has problems such as slow release of available phosphorus and low nutrient utilization rate.

[0003] Existing technologies attempt to combine potassium humate with calcium magnesium phosphate fertilizer. Among them, Chinese invention patent with publication number CN103265368A discloses a paste-like water-soluble fertilizer with potassium humate as the matrix. Its formula contains 2.1 to 3.8 parts by weight of calcium magnesium phosphate fertilizer and potassium humate added in as much as 80 to 100 parts by weight. The preparation method is to mix potassium humate with water to make a slurry, and then add other pulverized components and stir evenly to obtain a paste-like product.

[0004] However, the aforementioned existing technologies have the following significant drawbacks: First, the composition ratio is unbalanced, with excessive addition of potassium humate (far exceeding 50%), which weakens the role of calcium magnesium phosphate as a core functional component, significantly increasing fertilizer costs. Furthermore, excessive potassium humate can easily lead to potassium ion enrichment in the soil, causing nutrient imbalance in crops. Second, the formulation design is unreasonable. The paste-like formulation relies heavily on water as a substrate, limiting nutrient concentration. It is prone to stratification and water separation during transportation and storage, and requires specialized equipment for application, resulting in poor applicability. Third, the preparation process does not specifically treat potassium humate, allowing its active ingredients to non-specifically bind with ions in calcium magnesium phosphate, reducing the synergistic effect and failing to effectively improve the effective phosphorus release efficiency of calcium magnesium phosphate. Fourth, the formulation introduces large amounts of water-soluble salts such as potassium nitrate and monoammonium phosphate, which can exacerbate soil salinization with long-term application, making it unsuitable for saline-alkali land and sensitive soils.

[0005] To address the shortcomings of existing technologies, there is an urgent need to develop a potassium humate-containing calcium magnesium phosphate fertilizer with a scientifically formulated ratio, reasonable dosage form, simple preparation, and the ability to significantly improve nutrient utilization and adapt to various soil types. Summary of the Invention

[0006] Purpose of the invention: The invention provides a calcium magnesium phosphate fertilizer containing potassium humate and its preparation method. By optimizing the component ratio and improving the preparation process, the cost is reduced while improving the effective phosphorus release rate and nutrient synergistic utilization rate of the calcium magnesium phosphate fertilizer. It is suitable for various soil environments, and the formulation is easy to transport, store and apply.

[0007] Technical solution: To solve the above-mentioned technical problems, according to one aspect of the present invention, more specifically, a calcium magnesium phosphate fertilizer containing biochemical potassium humate, wherein the raw material components, by weight percentage, include: calcium magnesium phosphate fertilizer 97.5%~99.5%, biochemical potassium humate 0.4%~2.0%, and activation aid 0.1%~0.5%. This range can cover the ratios of different embodiments, taking into account activation effect, nutrient supply and cost control.

[0008] The calcium magnesium phosphate fertilizer is an agricultural calcium magnesium phosphate fertilizer that conforms to the national standard GB / T20412-2006, wherein... The content is ≥18%, CaO content is ≥30%, MgO content is ≥8%, and the particle size is 80~120 mesh to ensure the nutrient base and uniform dispersion.

[0009] The biochemical potassium humate is a highly active product made from plant residue through biological fermentation, with an organic matter content ≥50%. With a content ≥10%, moisture content ≤8%, and particle size of 100~150 mesh, its active functional groups can effectively chelate ions in calcium magnesium phosphate fertilizer and promote nutrient release.

[0010] The activating agent is a compound of citric acid and amino acids in a weight ratio of 1:1 to 3:1. The amino acid is aspartic acid or glutamic acid. The activating agent can adjust the pH of the system, prevent the ineffective combination of biochemical potassium humate and calcium magnesium phosphate fertilizer, and enhance the synergistic activity of the two.

[0011] This invention also provides a method for preparing the above-mentioned potassium humate-containing calcium magnesium phosphate fertilizer, comprising the following steps: Raw material pretreatment: Place calcium magnesium phosphate fertilizer in a drying device and dry it at 80~100℃ for 2~3 hours to remove moisture until the moisture content is ≤5%; mix biochemical potassium humate and activation aid in proportion, stir evenly and let stand for 15~30 minutes to obtain activated mixture, so that the activation aid can fully wet biochemical potassium humate and activate its active functional groups.

[0012] Mixing and grinding: Add the pretreated calcium magnesium phosphate fertilizer to a double helix mixer, then slowly add the activated mixture, control the mixing speed at 150~200 r / min, and the mixing time at 30~60 minutes; then feed the mixture into an ultrafine pulverizer and pulverize it to a particle size of 120~180 mesh to ensure that the components are evenly dispersed and increase the specific surface area to enhance the reaction activity.

[0013] Aging and solidification: The ground material is placed in an aging chamber and aged for 24 to 48 hours at room temperature and relative humidity of 50% to 60% to allow the biochemical potassium humate and calcium magnesium phosphate fertilizer to fully undergo a complexation reaction and form a stable nutrient system.

[0014] Screening and Packaging: The aged material is screened by a 120-mesh vibrating screen. The material that is on the screen is returned to the ultra-fine pulverizer for re-grinding, and the material that is under-screened is metered and packaged to obtain the finished product.

[0015] Beneficial effects: (1) The present invention uses calcium magnesium phosphate fertilizer as a component (97.5%~99.5%), and the amount of biochemical potassium humate added is controlled at 0.4%~2.0%. Compared with the problem of excessive potassium humate in the prior art, the raw material cost is greatly reduced. At the same time, through the synergistic effect of the activation agent (0.1%~0.5%), the calcium magnesium phosphate fertilizer is efficiently activated and the effective phosphorus release effect is improved. The fertilizer product is a solid powder formulation, which does not require the addition of a large amount of water. It does not have problems such as stratification, water separation, or gas expansion during transportation and storage. It can be applied directly by broadcasting, trenching, or mixed with other fertilizers. It is suitable for various planting scenarios such as open fields and greenhouses and different soil types. It is especially suitable for saline-alkali land and will not aggravate soil salinization.

[0016] (2) This invention pretreats biochemical potassium fulvate with an activating agent, and then mixes, grinds and ages it to solidify it. This allows the active functional groups of biochemical potassium fulvate to form stable complexes with phosphorus, calcium and magnesium ions in calcium magnesium phosphate fertilizer, avoiding ineffective binding and significantly improving nutrient utilization. This solves the problem of weak synergistic effect between the two in the prior art and improves crop absorption efficiency. This invention uses biochemical potassium humate and natural activating agents, without any harmful additives. After application, it can improve the soil aggregate structure, enhance the soil's water and fertilizer retention capacity, and optimize the soil's micro-ecological environment with long-term application. Compared with the paste fertilizers of the prior art, it is significantly more friendly to the soil. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the method flow of the present invention. Detailed Implementation

[0018] To make the technical solution of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Reference Figure 1 As shown, a formula and preparation method for producing potassium humate-containing calcium magnesium phosphate fertilizer are provided. The raw material components, by weight percentage, are: 99.5% calcium magnesium phosphate fertilizer, 0.4% biochemical potassium humate, and 0.1% activating agent (citric acid: aspartic acid = 2:1).

[0020] Preparation method: S1. Raw material pretreatment: Dry the calcium magnesium phosphate fertilizer at 90℃ for 2.5 hours, and control the moisture content at 4%; mix the biochemical potassium humate with the activating agent, stir evenly, and let stand for 20 minutes to obtain the activated mixture.

[0021] S2. Mixing and grinding: Add the pretreated calcium magnesium phosphate fertilizer to a double spiral mixer, add the activated mixture, mix at 180 r / min for 45 minutes, and then pulverize to 150 mesh.

[0022] S3. Aging and curing: Aging for 36 hours at room temperature and 55% relative humidity.

[0023] S4. Screening and Packaging: After screening by a 120-mesh vibrating screen, the finished product is measured and packaged.

[0024] The finished product of this embodiment can significantly improve the effective phosphorus release efficiency of calcium magnesium phosphate fertilizer, promote the absorption and utilization of nutrients by crops, and achieve good yield increase when applied to wheat planting.

[0025] Example 2 Reference Figure 1 As shown, a formula and preparation method for producing potassium humate-containing calcium magnesium phosphate fertilizer are provided. The raw material components, by weight percentage, are: 97.5% calcium magnesium phosphate fertilizer, 2.0% biochemical potassium humate, and 0.5% activating agent (citric acid: glutamic acid = 1:1).

[0026] Preparation method: S1. Raw material pretreatment: Dry the calcium magnesium phosphate fertilizer at 100℃ for 2 hours, and control the moisture content to 3%; mix the biochemical potassium humate with the activating agent, stir evenly, and let stand for 30 minutes to obtain the activated mixture.

[0027] S2. Mixing and grinding: Add the pretreated calcium magnesium phosphate fertilizer to a double spiral mixer, add the activated mixture, mix at 200 r / min for 30 minutes, and then pulverize to 180 mesh.

[0028] S3. Aging and curing: Aging for 48 hours at room temperature and 60% relative humidity.

[0029] S4. Screening and Packaging: After screening by a 120-mesh vibrating screen, the finished product is measured and packaged.

[0030] The finished product of this embodiment has an excellent activation effect on calcium magnesium phosphate fertilizer and significantly improves the effective phosphorus release performance. When applied to tomato cultivation, it can significantly improve crop growth and increase yield and quality.

[0031] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A formula for producing a potassium humate-containing calcium magnesium phosphate fertilizer, comprising calcium magnesium phosphate fertilizer, biochemical potassium humate, and an activating agent, characterized in that: The calcium magnesium phosphate fertilizer mentioned is an agricultural grade calcium magnesium phosphate fertilizer, wherein... Content ≥18%, CaO content ≥30%, MgO content ≥8%, particle size 80~120 mesh, to ensure nutrient base and uniform dispersion; The biochemical potassium humate is a highly active product made from plant residue through biological fermentation, with an organic matter content ≥50%. With a content ≥10%, moisture content ≤8%, and particle size of 100~150 mesh, its active functional groups can effectively complex ions in calcium magnesium phosphate fertilizer and promote nutrient release. The activating agent is a compound of citric acid and amino acids in a weight ratio of 1:1 to 3:

1. The amino acid is aspartic acid or glutamic acid. The activating agent can adjust the pH of the system, prevent the ineffective combination of biochemical potassium humate and calcium magnesium phosphate fertilizer, and enhance the synergistic activity of the two.

2. The formula for producing potassium humate-containing calcium magnesium phosphate fertilizer according to claim 1, characterized in that: The proportions of the raw materials of calcium magnesium phosphate fertilizer, biochemical potassium humate, and activating agent, by weight percentage, are 97.5%~99.5% calcium magnesium phosphate fertilizer, 0.4%~2.0% biochemical potassium humate, and 0.1%~0.5% activating agent.

3. A method for preparing a potassium humate-containing calcium magnesium phosphate fertilizer, using the formula for producing a potassium humate-containing calcium magnesium phosphate fertilizer as described in claim 2, characterized in that... Includes the following steps: S1. Raw material pretreatment Place the calcium magnesium phosphate fertilizer in a drying device and dry it at 80~100℃ for 2~3 hours to remove moisture until the moisture content is ≤5%; Mix biochemical potassium fulvate with an activating agent, stir evenly, and let stand for 15-30 minutes to obtain an activated mixture, so that the activating agent can fully impregnate the biochemical potassium fulvate and activate its active functional groups. S2, Mixing and Grinding Add the pretreated calcium magnesium phosphate fertilizer into a double helix mixer, then slowly add the activated mixture, controlling the mixing speed at 150~200 r / min and the mixing time at 30~60 minutes; The mixture is then fed into an ultrafine pulverizer and pulverized to a particle size of 120-180 mesh to ensure uniform dispersion of each component and increase specific surface area to enhance reaction activity. S3, Aging and Curing The ground material is placed in an aging chamber and aged for 24 to 48 hours at room temperature and relative humidity of 50% to 60% to allow the biochemical potassium humate and calcium magnesium phosphate fertilizer to fully undergo a complexation reaction and form a stable nutrient system. S4. Screening and Packaging After aging, the material is screened by a 120-mesh vibrating screen. The material that passes through the screen is returned to the ultrafine pulverizer for re-grinding, while the material that passes through the screen is weighed and packaged to obtain the finished product.

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