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CN-122010629-A - Formula for producing non-water-soluble medium element fertilizer containing potassium fulvate and preparation method thereof

CN122010629ACN 122010629 ACN122010629 ACN 122010629ACN-122010629-A

Abstract

The invention discloses a formula and a preparation method for producing a non-water-soluble medium element fertilizer containing potassium fulvate, belonging to the field of fertilizers. Aims at solving the problems of poor dispersibility, low absorption efficiency, limited soil improvement effect and high cost of the existing water-insoluble medium element fertilizer. The formula comprises a non-water-soluble medium element matrix, biochemical potassium fulvate, a dispersing aid, a functional synergistic agent and a purity regulator, and the preparation method sequentially comprises six procedures of raw material pretreatment, premixing, synergistic mixing, core mixing, superfine grinding, screening and packaging to finally obtain a tan powder finished product. The fertilizer combines the advantages of biochemical potassium fulvate and non-water-soluble medium elements, can activate calcium and magnesium elements, promote absorption efficiency, supplement trace elements, neutralize soil acidity, improve soil structure, relieve hardening and salinization, adapt to various soils and crops, has long-acting property and practicality, reduces application cost, and has remarkable agricultural application value.

Inventors

  • Ke Meitao
  • YANG FAN

Assignees

  • 特拉创新(襄阳)科技发展有限公司

Dates

Publication Date
20260512
Application Date
20260303

Claims (6)

  1. 1. The formula for producing the non-water-soluble medium element fertilizer containing the potassium fulvate is characterized by comprising 40-80 parts of non-water-soluble medium element matrix, 0.1-5 parts of biochemical potassium fulvate, 1-5 parts of dispersing auxiliary agent, 1-4 parts of functional synergistic agent and 5-15 parts of purity regulator; The non-water-soluble medium element matrix is a mixture of light calcium carbonate and light magnesium hydroxide, the weight ratio of the light calcium carbonate to the light magnesium hydroxide is 1:0.8-1.2, the purity of the light calcium carbonate is more than or equal to 99%, and the purity of the light magnesium hydroxide is more than or equal to 99%.
  2. 2. The formula and the preparation method for producing the non-water-soluble medium element fertilizer containing the potassium fulvate, which are disclosed in claim 1, are characterized in that the biochemical potassium fulvate is of a high activity BSFA type and is prepared by biological fermentation by taking cane molasses concentrated solution or beet pulp as a raw material; The indexes are that the content of the biochemical fulvic acid is more than or equal to 45%, the content of the total potassium (K 2 O) is more than or equal to 10%, the organic matter is more than or equal to 65%, the water content is less than or equal to 1%, and the pH value is 5-7.
  3. 3. The formula for producing the non-water-soluble medium element fertilizer containing potassium fulvate according to claim 1, wherein the dispersing aid is a mixture of calcium lignosulfonate and magnesium lignosulfonate in a weight ratio of 1:0.5-1, and the purity regulator is fumed silica with purity of more than or equal to 99%.
  4. 4. The formula for producing the non-water soluble medium element fertilizer containing the potassium fulvate according to claim 1, wherein the functional synergist is a mixture of sulfur and a citric acid chelate salt, and the weight ratio of the sulfur to the citric acid chelate salt is 2-3:1; wherein the purity of sulfur is more than or equal to 99%, and the content of each trace element in the citric acid chelate salt is 3.5-6.5% of zinc, 0.5-5.5% of iron, 1.5-2.7% of manganese, 0.5-2.0% of copper, 0.1-0.4% of molybdenum and 2-5% of boron.
  5. 5. The formula for producing the non-water soluble medium element fertilizer containing the potassium fulvate according to claim 1, wherein the light calcium carbonate is prepared by calcining calcite, limestone or oyster shell at high temperature to generate calcium oxide, introducing carbon dioxide for reduction reaction and purifying; The light magnesium hydroxide is prepared by reacting magnesium chloride stone, salt lake bittern or brine with lime milk to generate precipitate, and washing and purifying.
  6. 6. A method for producing a potassium fulvate-containing non-water-soluble medium element fertilizer, using the formulation for producing a potassium fulvate-containing non-water-soluble medium element fertilizer according to any one of claims 1 to 5, characterized by comprising the steps of: S1, pretreating raw materials, namely drying light calcium carbonate and light magnesium hydroxide at 105-110 ℃ for 2-3 hours, and sieving biochemical potassium fulvate with a 80-mesh sieve to remove impurities; S2, premixing, namely weighing a non-water-soluble medium element matrix, a dispersing auxiliary agent and a purity regulator, and mixing for 15-20 minutes at normal temperature of 150-200r/min in a double-screw mixer to obtain a basic mixture; S3, synergistic mixing, namely adding a functional synergistic agent into the basic mixture, heating to 40-50 ℃, keeping the rotation speed unchanged, and continuously mixing for 10-15 minutes to uniformly disperse the chelating salt to obtain a synergistic mixture; S4, core mixing, namely uniformly scattering the biochemical potassium fulvate into the synergistic mixture, cooling to normal temperature, stirring at a low speed for 25-30 minutes, ensuring that the biochemical potassium fulvate is coated on the surfaces of matrix particles, and avoiding loss of active ingredients to obtain a semi-finished product; S5, superfine grinding, namely, conveying the semi-finished product into a superfine grinder, grinding to the particle size of 4000-12500 meshes, and controlling the water content of the powder to be less than or equal to 0.8% to obtain a ground material; s6, screening and packaging, namely screening the crushed materials by a 120-mesh screen, returning unqualified particles to the superfine pulverizer for reprocessing, and packaging qualified products to obtain finished products.

Description

Formula for producing non-water-soluble medium element fertilizer containing potassium fulvate and preparation method thereof Technical Field The invention relates to the field of fertilizers, in particular to a formula for producing a non-water-soluble medium element fertilizer containing potassium fulvate and a preparation method thereof. Background The medium elements (calcium, magnesium, silicon, sulfur and the like) are nutrient substances which are indispensable to the growth and development of crops, the proportion of calcium deficiency in the cultivated land of the whole country reaches 64%, the proportion of magnesium deficiency reaches 53%, the annual silicon deficiency is about 4000 ten thousand tons, and the lack of the medium elements in the soil becomes a key factor for restricting the improvement of the yield and the quality of the crops. Meanwhile, the problems of soil acidification, hardening and salinization are increasingly prominent due to the long-term unreasonable application of chemical fertilizers, and the soil acidification is particularly serious in most areas in the south and in areas such as northeast China, jiaodong peninsula and the like, so that the nutrient absorption efficiency of crops is further reduced. The medium element fertilizers in the market at present are mainly divided into two types of water solubility and non-water solubility. The water-soluble medium element fertilizer mainly comprises calcium nitrate, magnesium nitrate, calcium ammonium nitrate and the like, is easy to be absorbed by crops, but contains acid radical ions which can aggravate soil acidification, is easy to run off in areas with abundant rainwater, and causes fertilizer waste and environmental burden. The water-insoluble medium element fertilizer is mainly prepared from magnesium hydroxide and calcium carbonate which are obtained by directly crushing and pulverizing ores, has the problems of high impurity and heavy metal content, heavy specific gravity, poor dispersibility and the like, needs to add a large amount of useless auxiliary agents, has the raw material water content of up to 50% -70%, and obviously increases the packaging and transportation cost. The biochemical potassium fulvate is taken as a natural fermentation product, has the characteristics of small molecular weight, high physiological activity, strong chelating capacity and the like, can improve the soil structure, regulate the pH value, promote the root growth of crops and nutrient absorption, is acid-base resistant and divalent ion resistant, and can be compounded with various elements without flocculating. In the prior art, biochemical potassium fulvate is mostly applied to the field of water-soluble fertilizers, the improvement research for non-water-soluble medium element fertilizers is less, a mature formula and a preparation process are not formed yet, and core defects of low absorption efficiency, poor soil adaptability and the like of the non-water-soluble medium element fertilizers cannot be effectively solved. Therefore, a fertilizer product which combines the advantages of biochemical potassium fulvate and the long-acting characteristics of water-insoluble medium elements is needed, and has important agricultural application value. Disclosure of Invention Aiming at the defects of poor dispersibility, low absorption efficiency, limited soil improvement effect and higher cost of the existing non-water-soluble medium element fertilizer, the invention provides the non-water-soluble medium element fertilizer containing biochemical potassium fulvate and the preparation method thereof, which realize multiple aims of improving the fertilizer utilization rate, improving the soil structure and reducing the application cost. According to one aspect of the invention, the formula for producing the non-water-soluble medium element fertilizer containing potassium fulvate comprises, by weight, 40-80 parts of a non-water-soluble medium element matrix, 0.1-5 parts of biochemical potassium fulvate, 1-5 parts of a dispersing auxiliary, 1-4 parts of a functional synergistic agent and 5-15 parts of a purity regulator. The non-water soluble medium element matrix is a mixture of light calcium carbonate and light magnesium hydroxide, the weight ratio is 1:0.8-1.2, wherein the purity of the light calcium carbonate is more than or equal to 99%, calcium oxide is generated by high-temperature calcination of calcite, limestone or oyster shell, the light magnesium hydroxide is prepared by reduction of carbon dioxide, the purity of the light magnesium hydroxide is more than or equal to 99%, and the light magnesium hydroxide is prepared by reacting magnesium chloride, salt lake bittern or brine serving as a raw material with lime milk to generate precipitate and purifying. The matrix can neutralize soil acidity, slowly release calcium and magnesium elements, and prolong fertilizer efficiency. The biochemical potassium fulvate is high-activity BSFA,