214 results about "Phosphate fertilizer" patented technology

The invention provides a preparation method of a lanthanum oxide modified biochar fertilizer, and belongs to the technical field of agricultural fertilizers, and the preparation method comprises the following steps: 1, microwave activation of biochar: placing corn straw biochar in a microwave reactor for radiation to obtain porous activated biochar; 2, potassium ion loading: dipping the porous activated charcoal in a saturated KOH solution to obtain a solid precipitate, and drying the solid precipitate to obtain potassium-loaded charcoal; 3, lanthanum-organic complex preparation: mixing lanthanum oxide with citric acid, adding deionized water to form a suspension, and performing evaporative crystallization to obtain a lanthanum-citric acid complex; 4, compounding modified biochar: mixing the obtained lanthanum-citric acid complex with potassium-loaded biochar to prepare slow-release lanthanum oxide modified biochar; and 5, compounding a phosphate fertilizer to obtain the slow-release composite charcoal fertilizer. According to the method, the charcoal is modified through lanthanum oxide, so that the modified charcoal has a larger specific surface area, the problem of hardening of the saline-alkali soil is better solved, and the oxygen content of the soil is increased.

The invention discloses a method for recovering phosphorus through anaerobic digestion by adding sludge-based biochar, which comprises the following steps of: firing dewatered sludge serving as a raw material under an anaerobic condition to obtain carbonized carbon; or firing under an aerobic condition to obtain pyrolytic carbon, adding any sludge-based biochar obtained by firing into the hydrothermal dewatered sludge, and carrying out anaerobic digestion on the hydrothermal dewatered sludge; the hydrothermal dewatered sludge is obtained by performing hydrothermal pretreatment on dewatered sludge; and carrying out phosphorus recovery on the sludge-based biochar subjected to anaerobic digestion by utilizing a magnetic separation method. Compared with the traditional method for recovering the phosphate fertilizer from the sludge incineration ash, the recovery method disclosed by the invention is green and pollution-free, belongs to a sludge treatment mode of treating waste with waste, realizes effective combination of a heat treatment mode and a biological treatment mode, and has a good practical application value. Moreover, the prepared sludge-based biochar has the property of magnetism, so that the recovery rate of the subsequent blue iron ore is increased, and the separation difficulty and economic investment are reduced.

The invention provides a moniliella malayi and a fungicide and application thereof, and relates to the field of microorganisms. The acer rubrum is specifically acer rubrum RA, and the preservation number of the acer rubrum RA is CGMCC (China General Microbiological Culture Collection Center) No.35889. The acer rubrum RA can be used for preparing the acer rubrum. The strain has the capability of decomposing inorganic phosphorus, is wide in phosphorus-dissolving range, can decompose tricalcium phosphate, iron phosphate and aluminum phosphate, and particularly still has very strong capability of decomposing inorganic phosphorus under a low-temperature condition; the strain has the capability of producing siderophore and IAA at low temperature; the strain has an inhibition effect on various pathogenic bacteria causing field crop diseases, and can inhibit diseases such as corn root rot, sorghum leaf spot or wheat root rot; the strain can be colonized in a soil environment of 5-40 DEG C, a microbial inoculum prepared from the strain can promote crop growth, the crop yield is remarkably improved, and high yield can be achieved even if the usage amount of phosphate fertilizer is reduced.

The invention discloses a method for increasing the yield of ratooning rice, and relates to a fine field management technology. In the whole process from sowing to harvesting, the method comprises the steps that nitrogenous fertilizer, phosphate fertilizer and potash fertilizer are applied in the specific growth stage, shallow water layer irrigation is kept, and water management is conducted immediately after first season rice is harvested so as to promote growth in the regeneration season. In addition, the method further comprises the steps of exogenous spraying of a plant growth regulator in the key growth period and unified management of diseases and pests. According to the technical scheme, the yield and stability of ratooning rice are improved by optimizing fertilization, irrigation and use of a plant growth regulator, and meanwhile environment safety and crop quality are guaranteed.

The invention relates to the technical field of fertilizers, in particular to a seaweed-containing synergistic monoammonium phosphate fertilizer as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a seaweed extract with beta-cyclodextrin, performing microencapsulation, and performing spray drying to obtain an embedded material; mixing with monoammonium phosphate and polyglutamic acid, and granulating; spraying salt-resistant compound bacteria liquid on the surfaces of the particles; and finally, coating the particles with a chitosan-sodium alginate composite film. According to the prepared synergistic monoammonium phosphate fertilizer finished product, the phosphorus utilization rate of monoammonium phosphate saline-alkali soil can be increased, the phosphorus fixation rate can be greatly reduced, the retention rate of active ingredients of the seaweed extract is greatly increased compared with that in the prior art, the rhizosphere survival rate of salt-tolerant flora is greatly increased, and the salt-tolerant flora, the seaweed extract and monoammonium phosphate cooperate to promote crop yield increase.

The invention belongs to the field of guidance of crop planting through image data processing, and particularly relates to a crop nutrient abundance and deficiency diagnosis model based on unmanned aerial vehicle image data and application thereof. The invention firstly provides a method for constructing a crop nutrient abundance and deficiency diagnosis model based on unmanned aerial vehicle image data, and the method comprises the following steps: S1, collecting canopy multispectral data of crops with different fertilizer application amount gradients in different growth periods, and collecting soil samples; s2; processing the multispectral data to obtain a vegetation index of crop growth, and measuring a soil nutrient index; and S3, obtaining a regression equation for calculating the soil nutrient index by using the key vegetation index, and judging whether the fertilizer needs to be supplemented or not by using the full-amount fertilization contrast as a threshold value. The invention further comprises the model and application of the model in guiding fertilization. Through unmanned aerial vehicle multispectral monitoring and dynamic threshold analysis, nutrient demand changes of crops in different growth periods are accurately captured in combination with an intelligent algorithm, and a field phosphate fertilizer deficient area is effectively identified to realize accurate fertilization.

The present invention belongs to the technical field of phosphate fertilizer production, and specifically relates to a zinc-containing diammonium phosphate, a preparation method thereof, and a fertilizer containing zinc-containing diammonium phosphate. Zinc-containing diammonium phosphate is prepared by coating elemental sulfur on the outer layer of solid zinc fertilizer to obtain a sulfur-containing zinc mixed slurry, which is then sprayed onto the diammonium phosphate for granulation to obtain the zinc-containing diammonium phosphate. The amount of solid zinc fertilizer added accounts for 30 to 100% of the total mass of elemental sulfur; and the amount of sulfur-containing zinc mixed slurry added is 1 to 10% based on the total weight of the zinc-containing diammonium phosphate. This preparation method avoids direct contact and antagonistic reactions between phosphate and zinc ions, prevents degradation of phosphorus and zinc nutrients, and maintains a good ratio of water-soluble zinc content and water-soluble phosphorus content.

To provide a phosphate-containing solid and a method for producing the same, with the use of sewage sludge incineration ash as a raw material, which has a high proportion of citrate-soluble phosphoric acid relative to a total phosphoric acid, contains a low amount of free phosphate, and can be effectively utilized as a phosphate fertilizer.SOLUTION: A phosphate-containing solid is produced by reacting sewage sludge incineration ash and sulfuric acid under non-aqueous conditions to generate water-soluble or citrate-soluble phosphates,in which the quantities of the aforementioned sewage sludge incineration ash and sulfuric acid are controlled during this generation process to achieve a citrate-soluble phosphate ratio relative to a total phosphoric acid of the phosphate to be produced of 0.7 mass ratio or higher, and a free phosphate content of 8 mass% or less, and a manufacturing method thereof is provided.SELECTED DRAWING: Figure 1

The invention discloses an efficient fertigation decision support method and system for protected tomatoes, particularly relates to the technical field of agricultural precise irrigation, and is used for solving the problems of supply lag and resource waste caused by the fact that an existing balanced fertilizer supply mode cannot respond to a short-time fertilizer demand peak in a fruit expansion period. The method comprises the following steps: acquiring the fruit diameter and generating a phosphorus pulse starting signal when the fruit diameter reaches an expansion threshold value; synchronously measuring the thickness change gradient of the root surface ion diffusion boundary layer, and marking a boundary layer correction coefficient according to the abrupt change rate; simulating a rhizosphere microcosmic phase field to calculate curvature distribution of a phosphate diffusion path, and generating a phase field topological entropy value; on the basis of a phosphorus pulse starting signal, a phase field topological entropy value and a boundary layer correction coefficient, calculating an optimal phosphate fertilizer injection time point through a quotient query conversion table; and a phosphate fertilizer injection instruction containing a fertilizer code is output to the drip irrigation execution device at the optimal time point, so that the soil nutrient immobilization loss is effectively reduced.

The invention relates to a magnesium modified sludge-based phosphorus-rich biochar material and a preparation method thereof, and belongs to the technical field of harmless treatment and resource utilization of municipal sludge. The invention provides a magnesium-modified sludge-based phosphorus-rich biochar material and a preparation method thereof.The preparation method comprises the following steps that municipal sludge is heated and dried, and sludge particles are obtained after treatment; pyrolyzing the sludge particles, and cooling to obtain sludge semicoke; adding a magnesium-based additive into the sludge semi-coke, heating and calcining in a nitrogen atmosphere, and cooling to obtain the phosphorus-rich biochar. According to the phosphorus-rich biochar prepared by the method, the harm caused by mass production and accumulation of municipal sludge is solved, a large amount of phosphorus element is enriched, and the phosphorus-rich biochar prepared by the method can replace phosphate fertilizer to be applied to grassland gardens or replace phosphorite to be exploited as a phosphate ore source; and the environment damage and resource waste caused in the phosphorite mining and phosphate fertilizer production process are reduced on the whole.

The invention belongs to the field of inorganic chemical industry, and particularly relates to a method and a system for efficiently utilizing a phosphate fertilizer byproduct, the method comprises the following steps: carrying out acidolysis on fluosilicic acid with the concentration of more than or equal to 45% wt and concentrated sulfuric acid to generate a mixed solution of silicon tetrafluoride gas and fluorosulfonic acid; the mass ratio of the fluosilicic acid to the concentrated sulfuric acid is controlled to be 1: (4-15); pyrolyzing the obtained fluorosulfonic acid to generate dilute sulphuric acid, hydrogen fluoride and water vapor, forming 98% concentrated sulphuric acid from part of dilute sulphuric acid and fuming sulphuric acid, drying hydrogen fluoride to obtain crude hydrogen fluoride gas, and condensing and rectifying to obtain anhydrous hydrogen fluoride; the rest dilute sulphuric acid is partially compounded and then returned for acidolysis, and the rest dilute sulphuric acid is used for producing white carbon black and flows back to a wet-process phosphoric acid system; and circularly absorbing the obtained silicon tetrafluoride gas by using secondary concentrated fluosilicic acid to obtain fluosilicic acid with the mass concentration of more than or equal to 45%, recycling the fluosilicic acid for acidolysis reaction, and modifying the concentrated by-product silicon dioxide to obtain the high-activity white carbon black. The problems of energy consumption and cost are solved, and efficient circulation and poly-generation of fluorine and silicon resources are achieved in the whole process.

The invention discloses a preparation method and an application method of straw wet biochar for carbon sequestration and emission reduction in rice and wheat rotation. The preparation method comprises the specific steps of preparation and application of the straw wet biochar. The preparation method of the straw wet biochar comprises the steps of raw material preparation, low-temperature combustion, normal-temperature slow oxidation, electromagnetic radiation treatment, microwave heating and light wave sterilization, filtration and freezing and cold storage treatment. The method is mainly used for improving straw resource utilization of a rice and wheat system. The preparation process is low in energy consumption and little in smoke dust, carbon volatilization in the straw is reduced, and the content of fixed carbon in the straw is greatly increased. According to the specific application, the compound fertilizer is mixed with fertilizer according to a certain weight ratio of the compound fertilizer to plough layer rice soil and then applied at a time during rice planting. Wherein the nitrogen fertilizer is a mixture of quick-acting urea nitrogen and slow-release urea nitrogen, and the phosphate fertilizer and the potash fertilizer are conventional fertilizers. The fertilizer can promote the increase of gaps in rice soil and the water retention of wheat soil, reduces the emission of N2O, CO2 and CH4 in the rice and wheat planting process after being applied, improves the organic carbon content of soil, reduces the emission of greenhouse gas carbon (CO2), and promotes the increase of the crop rotation yield of rice and wheat.

The invention belongs to the technical field of compound fertilizers, and particularly relates to a mineral source nitro-humic acid complex phosphate fertilizer for treating land salinization and a preparation method of the mineral source nitro-humic acid complex phosphate fertilizer. Comprising the following components in parts by weight: 50-80 parts of mineral source nitro humic acid, 5-20 parts of calcium superphosphate, 1-5 parts of a soil conditioner, 1-3 parts of trace elements, 5-15 parts of biochar, 0.5-2 parts of a complex microbial inoculant and 3-8 parts of a coating material.

The utility model relates to the technical field of phosphorite treatment, in particular to a device and system for preparing ammonium phosphate and byproduct nitrophosphate fertilizer by decomposing phosphorite with nitric acid. The device comprises an acidolysis tank, the acidolysis tank is connected to a first separator, the first separator is connected to a first crystallizer, the first crystallizer is connected to a second separator, the second separator is connected to a decalcification tank, the decalcification tank is connected to a denitration tank, and the denitration tank is connected to a second crystallizer. The denitration tank is respectively connected to the repulping tank and the purification equipment; the re-pulping tank is connected to a neutralizing tank, and the neutralizing tank is connected to a first concentrator; and the purification equipment is connected to the second concentrator. According to the device disclosed by the invention, the mother liquor generated by the acidolysis tank is deeply processed to prepare monoammonium phosphate and purified phosphoric acid, meanwhile, a byproduct white fertilizer can be processed into a phosphorus (potassium) nitrate fertilizer, and a byproduct white gypsum is obtained.

The group of inventions relates to the chemical industry, and more particularly to the production of nitrogen fertilizers, and can be used for producing granules of fertilizers such as, inter alia, ammonium nitrate, urea and ammonium nitrate-phosphate fertilizers, by prilling. What is proposed is a method for forming nitrogen fertilizer granules by prilling using a closed air circulation loop, in which cooling air is fed into the lower part of a prilling tower, a nitrogen fertilizer melt is sprayed into the upper part of the prilling tower, and granules are removed from the lower part of the tower. By means of at least one closed circulation loop, air is removed from the upper part of the prilling tower for preparation by purification and cooling and is returned to the lower part of the prilling tower as cooling air, wherein before being returned to the prilling tower, at least a portion of the air is sent for additional preparation by aftercooling, with the separation and removal of condensate and subsequent warming of the air. Also proposed is an apparatus for carrying out the claimed method. The technical result of the group of inventions consists in increasing the efficiency of a prilling process entailing a closed loop for the circulation of cooling air by improving the quality of the fertilizer produced, increasing operational reliability and reducing the overall dimensions of the equipment used, while maintaining a complete absence of prilling process emissions and obviating the need for the inspiration of external air.

The embodiment of the application provides a calcium superphosphate chemical conversion device capable of improving stirring rate, and relates to the technical field of phosphate fertilizer processing. The device comprises a mixing tank, a feeding port is arranged at the top end of the mixing tank, a first motor is arranged at the center position of the top end of the mixing tank, a rotating shaft is fixedly arranged on one side of the first motor, a first gear is fixedly arranged on one side of the rotating shaft, second gears are symmetrically and meshingly connected on the two sides of the first gear, and rotating rods are fixedly arranged on one side of the two second gears. Through the operation of the first motor, the rotating shaft is driven to rotate, the two second gears on the two sides are driven to rotate through the meshing of the first gear, and then the rotating rods are driven to rotate, the first stirring rod, the L-shaped rod and the second stirring rod are driven to synchronously rotate, the coverage area is improved through the first stirring rod, the L-shaped rod and the second stirring rod, and the stirring process is more uniform and efficient, and good sufficient stirring is achieved.

The invention provides a phosphorus release improving type compound fertilizer based on a fungal extracellular polymer, a preparation method and application, and belongs to the technical field of microorganisms, the phosphorus release improving type compound fertilizer is prepared by compounding the extracellular polymer generated by specific rhodotorula mucilaginosa WTSX01 and inorganic phosphate according to the mass ratio of 1: 9; the preparation method comprises the following steps: extracting and purifying high-activity EPS from a strain fermentation broth by a low-temperature dialysis method, separating lipid from EPS as a natural adhesive by a cosolvent extraction method, and finally mixing EPS, lipid and inorganic phosphate. The invention also discloses a synergistic application of the fertilizer and a phosphorus-solubilizing fungus aspergillus niger (CCTCC No. M2023240), so that the release efficiency of phosphorus in soil is improved; the fertilizer provided by the invention provides exclusive nutrition for phosphate-solubilizing microorganisms, effectively overcomes indigenous microorganism competition, remarkably promotes microorganism growth and phosphorus release, and realizes reduction and synergism of phosphate fertilizer and yield increase of crops.

The present application relates to the field of fertilizers, and in particular to a soil fertilizer containing fish enzymes and a preparation method thereof. A soil fertilizer containing fish enzymes, the raw materials of which include, by mass, 10 to 20 parts of fish enzymes, 30 to 50 parts of urea, 5 to 10 parts of polyglutamic acid complex, 5 to 10 parts of modified chitosan, 1 to 3 parts of humic acid, 1 to 3 parts of aminobutyric acid, 10 to 20 parts of inorganic metal compounds, 4 to 6 parts of phosphate fertilizers, 1 to 5 parts of binders, 4 to 10 parts of surfactants, and 50 to 80 parts of deionized water. The fish enzyme fertilizer prepared in the present application can not only significantly improve soil fertility, increase crop product quality, promote crop growth, and improve soil, but it is also different from existing enzyme / protein fertilizers and has excellent self-stability, thereby avoiding the technical problems of difficult storage, difficult transportation, and easy deterioration and inactivation of existing organic fertilizers of this type, and has excellent market prospects.

The invention provides a phosphorus-fixing lanthanum-based nano composite material as well as a preparation method and application thereof, and relates to the field of novel nano composite materials. According to the material, lysozyme protein fibers are taken as a structural template, a confinement space is constructed by utilizing the ultrahigh length-diameter ratio of the lysozyme protein fibers, and controllable synthesis of the sub-5nm high-dispersion lanthanum oxide nanoparticles is realized. Functional groups in a protein chain can be enriched and nucleation sites can be provided through electrostatic attraction and key coordination synergistic effect, so that the lanthanum-based protein fiber nano composite material is formed. When the material is used for treating phosphorus wastewater, efficient phosphorus removal and long-term phosphorus fixation are realized through an enrichment-conversion synergistic mechanism: phosphate ions are enriched through electrostatic adsorption, and thermodynamically stable lanthanum phosphate is generated in situ at lanthanum active sites. According to the method, gt is still kept in the presence of high-concentration equal competitive ions; the phosphorus removal rate is 90%, the generated lanthanum phosphate can be used as a slow-release phosphate fertilizer or an industrial phosphorus chemical raw material, and closed-loop conversion from pollution purification to resource utilization is realized.

The invention provides a method, a system and equipment for generating a special fertilizer formula for crops. The method comprises the following steps: acquiring crop growth data of any region; constructing a nitrogen fertilizer recommendation model according to the crop growth data, and obtaining a nitrogen application amount prediction value and a yield prediction value; constructing a phosphate fertilizer recommendation model based on a phosphate fertilizer grading standard according to the yield prediction value and the actually measured data of the content of the rapidly available phosphorus in the soil, and obtaining a phosphorus application amount prediction value; establishing a potash fertilizer recommendation model based on a potash fertilizer grading standard, and obtaining a potassium application amount prediction value; respectively calculating the base fertilizer amount and the topdressing amount of nitrogen, phosphorus and potassium according to the predicted value of the nitrogen application amount, the predicted value of the phosphorus application amount, the predicted value of the potassium application amount and the base-topdressing ratio; constructing a base fertilizer formula model according to the base fertilizer amount of nitrogen, phosphorus and potassium; and constructing a dynamic adjustment model according to the topdressing amount of nitrogen, phosphorus and potassium, and calculating a topdressing correction value. The method can accurately and efficiently formulate a fertilization strategy which is suitable for crops, lands and conditions, obviously improves the utilization efficiency of the fertilizer, and reduces excessive application.

This invention discloses a wheat-specific fertilizer suitable for rice-wheat rotation and its preparation method, comprising the following steps: mixing equal volumes of carboxymethyl chitosan solution, composite biochar dispersion, and agar solution, then adding sodium tripolyphosphate solution dropwise, stirring, allowing to stand, dialyzing, and freeze-drying to obtain hydrogel particles; swelling the hydrogel particles in a mixed aqueous solution of urea and superphosphate, filtering, and vacuum drying to obtain the wheat-specific fertilizer suitable for rice-wheat rotation; this invention uses a coating material to coat composite biochar powder, nitrogen fertilizer, and phosphate fertilizer, and improves the utilization rate of nitrogen and phosphate fertilizer through the slow-release effect of the coating material; by adsorbing fixed trace metal elements through the coating material, the slightly acidic state of the phosphate fertilizer during dissolution is used to convert the adsorbed fixed trace metal elements into a free state, and then titanium aluminum carbide promotes the movement of the free trace metal elements, thereby promoting the absorption and utilization of trace metal elements by wheat roots and improving wheat yield and quality.

The invention relates to the technical field of soil improvement, in particular to a soil conditioner for improving desert saline-alkali soil and application of the soil conditioner. The soil conditioner is prepared from 5.5 to 7.5 * 10 < 4 > kg of yellow water, 5 to 6 * 10 < 3 > kg of crop straw, 60 to 76 kg of phanerochaete chrysosporium, 50 to 60 kg of bacillus amyloliquefaciens J10, 30 to 46 kg of trichoderma viride, 30 to 50 kg of lactobacillus kefir CP423, 1 to 1.2 * 10 < 4 > kg of organic fertilizer, 0.8 to 1.2 * 10 < 3 > kg of amino acid water-soluble fertilizer, 25 to 35 kg of nitrogen fertilizer and 8 to 12 kg of phosphate fertilizer. After the soil conditioner is applied to ecological improvement, the content of organic matter, total nitrogen, total phosphorus, alkali-hydrolyzable nitrogen and available phosphorus can be effectively increased, the soil quality is remarkably improved, and the yield and quality of planted crops can be remarkably improved.

The invention discloses a method for preparing a slow release fertilizer while recovering fluorine in phosphate tailings and raffinate acid, and belongs to the technical field of clean processing and utilization of phosphorus resources. According to the method, resource utilization of the raffinate acid and the phosphate tailings is achieved, the utilization rate of phosphorus resources in the raffinate acid is increased, and the adverse effect of phosphate tailing stockpiling on the environment is reduced. According to the method, efficient recovery of fluorine resources in the raffinate acid and the phosphate tailings can be achieved, the utilization efficiency of the fluorine resources is further improved through step-by-step recovery, the escape form of fluorine can be regulated and controlled by introducing the active diatomite, and corrosion is reduced. Meanwhile, a calcium polyphosphate slow-release fertilizer which is rich in medium trace elements such as calcium, magnesium and sulfur can be prepared at the same time, phosphorus exists in a polymerization state and cannot be rapidly fixed, orthophosphate is slowly released as time goes on, the requirements of crops are met, and the calcium polyphosphate slow-release fertilizer is a novel phosphate fertilizer product with a relatively good prospect. Therefore, the method has good economic benefits, social benefits and wide industrial application prospects.

The invention discloses a nutrient element combined application combination for improving yield and quality of pinellia ternate and an application method. The nutrient element combined application combination comprises urea, calcium superphosphate, potassium sulfate, EDTA chelated copper, disodium octaborate tetrahydrate and sodium molybdate. The application method comprises the following steps: applying nitrogenous fertilizer and phosphatic fertilizer during sowing in April, applying nitrogenous fertilizer, phosphatic fertilizer, potash fertilizer, copper fertilizer, boric fertilizer and molybdenum fertilizer from June to July, and applying potash fertilizer, copper fertilizer, boric fertilizer and molybdenum fertilizer in August; according to the method, orthogonal experimental design is adopted, the nutrient element combined application combination most suitable for pinellia ternata production is obtained, the application method of the combined application combination designed by the invention is simple, convenient and easy to control, the yield of pinellia ternata can reach a relatively high level, the yield is 14619.42 kg: hm <-2 >, and the difference (P is less than 0.5) between the yield and the highest yield (14901.40 kg. Hm <-2 >) of the element combined application combination is not obvious.

The present invention relates to a fertilizing composition based on renewable phosphate fertilizers by proposing a composition which includes struvite, at least two trace elements, at least one secondary element, and at least one clay.

Ligand-coated, doped lithium iron phosphate, wherein the general formula of the ligand-coated, doped lithium iron phosphate is LiFePO4@Mn-TC / N, where T is zinc and / or nickel and / or copper and / or iron and / or cobalt and / or zirconium and / or aluminum and / or gallium and / or chromium, and wherein the ligand-coated, doped lithium iron phosphate is produced by a manufacturing process comprising the following steps: Mixing a phosphate fertilizer, an iron source and a regulator, heating the resulting mixture for a reaction, performing a solid-liquid separation and removing a solid phase for initial calcination to obtain iron phosphate; Mixing the iron phosphate with a lithium source, a carbon source, and a carbon microsphere conductor, stirring the resulting mixture, and subjecting the mixture to a second calcination to obtain carbon microsphere conductor-doped lithium iron phosphate; and Mixing the lithium iron phosphate doped with the carbon microsphere conductor with a sulfite and a liquid-phase ligand, stirring a resulting mixture and subjecting the mixture to aging, crosslinking and third calcination to obtain the ligand-coated lithium iron phosphate, wherein the carbon microsphere conductor comprises carbon nanospheres, 1,6-bis(dimethylamino)hexane, a manganese source, a T source, methacrylamide and a dispersant, and wherein the T source comprises at least one of the following: soluble chloride salts, nitrates or sulfates of zinc, nickel, copper, iron, cobalt, zirconium, aluminium, gallium or chromium.

The invention discloses a straw-loaded and gel-coated dual slow-release phosphate fertilizer and a preparation method thereof. Mixing a phosphorus-containing solution with an H2O2 solution to prepare a mixed solution, mixing the straw powder with the mixed solution, heating and oscillating under a closed condition, neutralizing with alkali liquor until the pH is acidic, filtering, drying, and crushing to obtain fertilizer core powder; granulating the fertilizer core powder by using an SA solution as an adhesive to obtain a fertilizer core of the dual slow-release phosphate fertilizer; and uniformly spraying a layer of SA / PAA mixed solution on the surface of the fertilizer core, and then immersing the fertilizer core in a CaCl2 / chitosan (CTS) / CH3COOH mixed solution for crosslinking to obtain the straw-loaded and gel-coated dual slow-release phosphate fertilizer. According to the invention, nutrient release is controlled through straw loading and gel coating, and phosphorus fixing cations in soil are complexed by utilizing the characteristic of SA polyanions, so that the effectiveness of the phosphate fertilizer in the soil is synergistically improved.

The invention relates to the technical field of sludge calcination, in particular to a method for regulating and controlling a phosphorus phase in a sludge calcination product by utilizing kaolinite. The invention discloses a method for regulating and controlling a phosphorus phase in a sludge calcined product by utilizing kaolinite. The method comprises the following steps: calcining a mixture of kaolinite and sludge in a certain proportion at 600-700 DEG C for 2-4 hours; in the mixture, the mass ratio of kaolinite is 8-10%. The kaolinite is added to be pyrolyzed and calcined with the sludge, under the synergistic effect of proportion, temperature and the like, phosphorus phase reconstruction in the calcined sludge product is regulated and controlled, the total phosphorus (TP) preservation amount is increased, and phosphorus in the sludge is converted into a form which has higher recovery value, higher bioavailability and is easier to extract subsequently, especially apatite-state phosphorus (AP); the phosphate fertilizer is stable in chemical property and moderate in solubility, and is a source of high-quality phosphate fertilizer or phosphorus chemical raw materials.

This utility model belongs to the field of automatic measurement technology, specifically relating to an automatic pH measuring device for viscous mother liquor of nitrate phosphate fertilizer. It includes a sampling tube, one end of which extends into a nitrate phosphate neutralization tank, and the other end of which is located outside the tank and connected to an analytical flow cell. A sampling container is connected to the upper part of the analytical flow cell via a pipeline. The upper part of the sampling container is connected to the inlet of a vacuum pump via a pipeline equipped with a suction solenoid valve. A pH probe is installed on the analytical flow cell to detect the pH value of the mother liquor flowing through it. The pH probe, suction solenoid valve, and vacuum pump are all electrically connected to a PLC controller. This utility model uses the cooperation of the vacuum pump and sampling tube to extract the mother liquor for pH measurement. During extraction, the mother liquor is in a sealed environment, preventing leakage. Simultaneously, the sampling container and integrated temperature transmitter effectively prevent the mother liquor from entering the vacuum pump.

The invention aims to provide a wet desulfurization method of a nitric phosphate by-product calcium carbonate residue, and belongs to the technical field of calcium carbonate desulfurization, the method comprises the following steps: carrying out impurity removal, quality improvement, grinding, drying and other processes on nitric phosphate calcium carbonate residue to prepare a calcium carbonate residue powder material, and applying the calcium carbonate residue powder material to a wet desulfurization process. The wet desulphurization method for the by-product calcium carbonate slag of the nitrophosphate fertilizer can replace an existing limestone desulfurizer to achieve efficient desulphurization, and exploitation of non-renewable limestone mineral resources is reduced.