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CN-121974753-A - Micro-mineral activator and application thereof in improving fertilizer efficiency of bio-organic fertilizer

CN121974753ACN 121974753 ACN121974753 ACN 121974753ACN-121974753-A

Abstract

The invention belongs to the field of agricultural fertilizers, and provides a micro-mineral activator and application thereof in improving fertilizer efficiency of a biological organic fertilizer. The invention adopts epoxy silane coupling modified potassium feldspar powder as a core to construct the biphase synergistic design of humic acid coated core-shell composite powder IM-X and metal ion crosslinking microgel powder IM-Y, realizes the balance of the compressive strength of particles and the rapid disintegration dispersion performance when meeting water, the compromise of a granulation process window with high solid content and low water addition and the rheological stability of a humic acid crosslinking network, and the unification of the moisture absorption resistance, agglomeration resistance and the water absorption and water retention ion response regulation and control functions after application, solves the performance coupling contradiction of natural conflict on the physical and chemical mechanism of the traditional mineral-organic composite additive, has the advantages of good processing controllability, excellent storage and transportation stability and obvious fertilizer effect promotion effect, and has wide application value in the field of biological organic fertilizer synergism.

Inventors

  • WAN SHUBO
  • WEI XIANGSHENG
  • YU WEIJIA
  • WANG JIANGUO
  • WANG JIAWEI

Assignees

  • 山东爱福地生物股份有限公司

Dates

Publication Date
20260505
Application Date
20260224

Claims (10)

  1. 1. A micro-mineral activator, which is characterized by comprising the following components in terms of dry mass: a) Humic acid coated potassium feldspar core-shell composite powder IM-X is 30-80 wt%; b) Humic acid-metal ion cross-linked microgel powder IM-Y is 2-25 wt%; c) 0-20 wt% of calcium carbonate; d) Silica, 0-5 wt%, and the sum of the contents of a) to d) is 100 wt%; wherein the D50 of the IM-X is 0.8-8 mu m, the dry basis mass ratio of humic acid in the IM-X is 2-12 wt%, the D50 of the IM-Y is 20-300 mu m, the water content of the finished product of the micro-mineral activator is 0.5-10 wt%, and the total mass of the finished product of the micro-mineral activator is taken as a reference; wherein the content of a) to d) is the solid component proportion of the micro-mineral activator in a dry basis, and the water content of the finished product is not counted in the 100 wt% of a) to d).
  2. 2. Themicromineralactivatoraccordingtoclaim1,whereintheepoxysilanecouplingmodifiedpotassiumfeldsparpowderIM-acontainedinIM-Xispreparedbythestepsof: A1. Taking 100 parts by mass of potassium feldspar powder, adding the potassium feldspar powder into a mixed solvent formed by ethanol and water to ensure that the solid content is 5-30 wt%, and stirring for 10-30 min; A2. Regulating the pH value of the slurry obtained in the step A1 to 4.0-5.0 by acetic acid; A3. Adding 3-glycidoxypropyl trimethoxy silane into the slurry obtained in the step A2, wherein the adding amount is 0.2-5.0 wt percent, and the reaction is carried out at 25-45 ℃ for 1-3h based on the dry mass of potassium feldspar powder; A4. c, carrying out solid-liquid separation on the solid-liquid system obtained in the step A3, and washing the obtained solid phase with the mixed solvent for 2-6 times; A5. dryingthewashedsolidphaseat60-90℃untilthewatercontentislessthanorequalto5wt%,thusobtainingIM-A; whereintheweightgainoftheIM-ArelativetothedrybasisweightofthepotassiumfeldsparpowderusedinthestepA1is0.1-5wtpercent,andthedrybasisweightgainisusedasanendpointcriterionforthecouplingmodificationoftheepoxysilane.
  3. 3. The micro mineral activator according to claim 1, wherein the IM-X is prepared by the steps of: B1. Adding water into humic acid to prepare 1-20 wt% humic acid solution, adjusting the pH of the humic acid solution to 8.0-10.0 with sodium hydroxide, and stirring at 25-60 ℃ for 0.5-2 h to obtain humic acid alkali solution; B2. addingIM-AintothehumicacidalkalisolutionobtainedinthestepB1toensurethatthedrybasismassratiooftheIM-Atothehumicacidis10:1-50:1,maintainingthepHofthesystemat8.0-9.0,andreactingat40-70℃for1-4h; B3. regulating the pH value of the system obtained in the step B2 to 6.0-8.0 by acetic acid, then carrying out solid-liquid separation, and washing for 1-6 times by water; B4. drying the solid phase obtained in the step B3 at 60-90 ℃ until the water content is less than or equal to 8 wt to obtain IM-X; wherein the D50 of the IM-X is 0.8-8 mu m, and the dry basis mass loss of the IM-X in the range of 200-600 ℃ is 2-12 wt percent, which is used as a quality criterion for representing the humic acid core-shell coating amount.
  4. 4. The micro mineral activator according to claim 1, wherein the IM-Y is prepared by the steps of: C1. Adding water into humic acid to prepare 1-10 wt% humic acid solution, and adjusting pH to 7.0-9.0 with sodium hydroxide; C2. preparing a cross-linking salt solution selected from any one or a combination of 5-30 wt% aqueous solution of calcium chloride dihydrate, 1-20 wt% aqueous solution of iron (III) chloride hexahydrate; C3. Adding the crosslinked salt solution in the step C2 into the humic acid solution in the step C1 in a continuous dropwise manner at the temperature of 20-40 ℃ to ensure that the adding amount of the crosslinked salt is 0.2-10 wt%, wherein the adding amount is calculated by the crosslinked salt and based on the dry mass of the humic acid, and stirring the mixture to form uniform gel, wherein the adding amount is 0.5-2 h; C4. granulating or spray-forming the gel obtained in the step C3, washing with ethanol for 1-3 times, and drying at 40-80 ℃ until the water content is less than or equal to 10 wt%, thus obtaining IM-Y; Wherein, the D50 of the IM-Y is 20-300 mu m, which is used as the end point criterion of microgel forming.
  5. 5. A process for the preparation of a micro-mineral activator according to any one of claims 1 to 4, comprising the steps of: S1,respectivelypreparingepoxysilanecouplingmodifiedpotassiumfeldsparpowderIM-Aandhumicacidcoatedpotassiumfeldsparcore-shellcompositepowderIM-Xandhumicacid-metalioncrosslinkingmicrogelpowderIM-Y; s2, mixing the humic acid coated potassium feldspar core-shell composite powder IM-X with humic acid-metal ion crosslinked microgel powder IM-Y and optional calcium carbonate and/or silicon dioxide, granulating and drying to obtain the micro-mineral activator.
  6. 6. The method according to claim 5, wherein step S2 comprises: S2-1) taking 30-80 parts by mass of humic acid coated potassium feldspar core-shell composite powder IM-X, 2-25 parts by mass of humic acid-metal ion crosslinked microgel powder IM-Y, 0-20 parts by mass of calcium carbonate and 0-5 parts by mass of silicon dioxide, and dry-mixing 5-30 min parts by mass, wherein the mass parts of the components are calculated on a dry basis and the sum of the mass parts is 100 parts by mass; S2-2) adding water into the mixture obtained in the step S2-1 to enable the water content of the material to reach 10-30 wt%, and granulating 10-60 min in granulating equipment; s2-3) drying the particles obtained in the step S2-2 at 40-80 ℃ until the water content of the finished product is 0.5-10 wt%, and screening to obtain the micro-mineral activator particles with the particle size of 0.5-4.75 mm.
  7. 7. Themethodaccordingtoclaim5,whereinthereactiontemperatureofstepA3forpreparingtheepoxysilanecouplingmodifiedpotassiumfeldsparpowderIM-AinstepS1is30-40℃; inthestepS1,thedrybasismassratioofhumicacidcoatedpotassiumfeldsparcore-shellcompositepowderIM-XtoIM-Ais1:10-1:30.
  8. 8. The method according to claim 5, wherein the crosslinked salt of the humic acid-metal ion crosslinked microgel powder IM-Y prepared in the step S1 is selected from any one or a combination of calcium chloride dihydrate and iron (III) chloride hexahydrate, wherein the amount of the crosslinked salt added is 1-8 wt% based on the dry mass of humic acid when the crosslinked salt is calcium chloride dihydrate, and 0.2-3 wt% based on the dry mass of humic acid when the crosslinked salt is iron (III) chloride hexahydrate. When the cross-linking salt is a combination of the two, the adding amount of the calcium chloride dihydrate is 0.5-8 wt%, the adding amount of the ferric chloride (III) hexahydrate is 0.2-3 wt%, and the sum of the adding amounts is 0.7-10 wt%, which are all based on the dry mass of humic acid.
  9. 9. The method according to claim 6, wherein the granulating apparatus in step S2-2 is a rotary drum granulator or a disk granulator, and the drying temperature in step S2-3 is 45 to 70 ℃.
  10. 10. The use of the micro-mineral activator according to any one of claims 1 to 4 for improving the fertilizer efficiency of a bio-organic fertilizer, wherein the addition amount of the micro-mineral activator is 2 to 10 wt percent based on the dry mass of the bio-organic fertilizer.

Description

Micro-mineral activator and application thereof in improving fertilizer efficiency of bio-organic fertilizer Technical Field The invention relates to the field of agricultural fertilizer additives, in particular to a micro-mineral activator and application thereof in improving the fertilizer efficiency of a biological organic fertilizer. Background The biological organic fertilizer is used as a core input product of modern ecological agriculture, and plays an irreplaceable role in improving soil structure, improving crop quality, relieving non-point source pollution of chemical fertilizer and the like through the synergistic effect of organic fertilizer and beneficial microorganisms. With the deep advancement of national fertilizer pesticide decrement efficiency strategy and the comprehensive implementation of tilling quality improvement project, the market presents a multi-dimensional jump situation to the performance requirement of the bio-organic fertilizer, which not only requires the product to have stable nutrient slow release supply capability and lasting microorganism activity maintenance capability, but also puts forward higher requirements to the physical stability, application convenience and environmental response intelligence of the granular product, and is particularly embodied in the aspects that the granules are required to have excellent compression resistance and wear resistance to ensure that the storage and transportation process is not broken, the quick disintegration and dispersion performance in water is ensured to quickly release the nutrient and activate microorganisms after application, and moderate water absorption and retention performance is ensured to maintain the micro-ecological humidity environment of soil. The compound performance requirements are met and developed, and the compound performance requirements have important significance for widening the application range of the bio-organic fertilizer in the scenes of facility agriculture precise fertilization, dry farming agriculture moisture management, saline-alkali soil improvement and repair and the like and promoting the fertilizer industry to transform and upgrade in the intelligent greening direction. Aiming at the performance requirements, the current research is mainly focused on improving the physical stability and the functionality of the bio-organic fertilizer by adding the compounding of mineral powder (such as zeolite powder, vermiculite powder, bentonite and the like) and organic macromolecules (such as humic acid, lignin and the like), but the defects that firstly, stable interface combination is difficult to form due to simple physical mixing of the traditional mineral powder and the organic matters, so that the particles are easy to lose mechanical strength due to moisture absorption and softening in the storage and transportation process, the compressive strength is excessively improved, the water-encountering disintegration speed is sacrificed, and the two performances of compressive and abrasion resistance and water-encountering rapid disintegration and dispersion of the particles are difficult to be simultaneously realized. For example, chinese patent publication No. CN109485527A discloses a nitro fertilizer containing activated mineral humic acid and a preparation method thereof, but the nitro fertilizer has the defect of obvious strength reduction after moisture absorption of particles. In addition, although organic macromolecules such as humic acid and the like have rich active sites and crosslinking capability, a high-viscosity crosslinking network is extremely easy to form under the industrial granulation condition of high solid content and low water addition, so that rheological control is caused, granulation is difficult, energy consumption is high, yield is low, and the stability of the industrial granulation processing window with high solid content and low water addition and the high active site crosslinking network of humic acid are difficult to be compatible. And in order to improve the storage and transportation stability, the existing product often sacrifices the water absorption and retention functions, or seriously absorbs moisture and agglomerates in the storage process in order to pursue the water absorption and retention functions, so that the moisture absorption and agglomeration resistance in the storage and transportation process and the water absorption and retention ion response regulation and control functions after application are difficult to be compatible. For example, chinese patent publication No. CN113443945A discloses a granulation method for preparing a potassium humate compound fertilizer, but the finished product has the defect of easy moisture absorption and agglomeration. Disclosure of Invention The invention aims to provide a micro-mineral activator and application thereof in improving the fertilizer efficiency of a biological organic fertilizer, and solve the proble