20 results about "Ammonium phosphate" patented technology

The present invention relates to a method for producing liquid NPK fertilizer, characterized in that the reactants K2CO3 or KHCO3, NH4HCO3, and H3PO4 are reacted in an aqueous solution to produce potassium and ammonium phosphate salts, particularly K3PO4 and (NH4)3PO4; the reaction is carried out in multiple steps and includes at least one exothermic reaction and at least one endothermic reaction; and the temperature of the reaction is controlled by adjusting the amount and rate of addition of each reactant in the various steps so as to maintain the reaction mixture within a desired temperature range, preferably between 5°C and 50°C, throughout the reaction, without the need for external cooling or heating devices to control the temperature of the reaction. In a more specific embodiment, the method according to the invention is characterized in that at least one exothermic reaction comprises the reaction of K2CO3 with HO to produce KHCO3 and KOH and / or the reaction of KHCO3 with H3PO4 to produce K3PO4, CO2, and HO, and at least one endothermic reaction comprises the reaction of NH4HCO3 with H3PO4 to produce (NH4)3PO4, CO2, and HO.

The application discloses a compound fertilizer for promoting cotton high yield and a preparation method thereof, relates to the technical field of cotton fertilizer, and comprises first mother liquor A, second mother liquor B and third mother liquor C which are prepared, stored and packaged separately; the first mother liquor A contains urea phosphate, monoammonium phosphate, anhydrous citric acid, malic acid and manganese sulfate monohydrate; the second mother liquor B contains commercial 11-37-0 liquid ammonium polyphosphate, ammonium salt type polyaspartic acid solution, purified fulvic acid clear liquid and tri-potassium citrate; and the third mother liquor C is a mixed system of polyol complex state boron clear pre-liquid and medium complex state zinc pre-liquid. The application can improve the effective state stability of phosphorus, zinc and boron, reduce the risks of precipitation fouling and dripping head blockage, alleviate the risks of local salt peak and root injury in the seedling stage, promote the uniform emergence and young root growth of cotton, and improve the yield.

The invention discloses a method for synergistically preparing magnesium ammonium phosphate by treating ammonia-nitrogen wastewater with phosphate tailings, which comprises the following steps: roasting the phosphate tailings at high temperature to obtain roasted ore; the obtained roasted ore is subjected to digestion treatment, CO2 is introduced into ore pulp for carbonization, and the CO2 comes from roasting waste gas CO2 and carbon-containing flue gas; performing solid-liquid separation to obtain a first filtrate and a first filter residue, using the first filter residue to recover calcium, and using the first filtrate to treat ammonia-nitrogen wastewater; adding a phosphorus source and ammonia-nitrogen wastewater into the first filtrate, adjusting the pH value, and filtering after reaction to obtain a second filtrate and a second filter residue; the ammonia nitrogen content of the second filtrate is detected through Nessler's reagent spectrophotometry, and the ammonia nitrogen removal standard is met; and drying the second filter residue at low temperature to obtain a magnesium ammonium phosphate product. The method is low in production cost, high in product value and high in resource utilization rate, ammonia nitrogen in the wastewater can be efficiently removed, the environmental wastewater discharge standard is met, efficient value-added utilization of industrial by-products is achieved, and meanwhile the prepared magnesium ammonium phosphate product meets the industrial standard.

This invention relates to a method for the graded utilization of wet-process phosphoric acid and the co-production of food-grade phosphoric acid and ammonium phosphate, belonging to the field of phosphoric acid chemical technology. The method first purifies the raw phosphoric acid, with the main process involving multi-stage extraction and back-extraction to obtain food-grade phosphoric acid. For the byproduct raffinate acid, no complex purification is required; instead, a slurry process is used directly to prepare fertilizer. When producing diammonium phosphate, the final neutralization pH is controlled at 8.0-8.5, and the degree of ammoniation is 1.8-2.0. When producing monoammonium phosphate, the raffinate acid is mixed with slag acid and filter solids, and a small amount of raw material acid is added to neutralize to a pH of 4.0-4.5, with a degree of ammoniation of 1.0-1.1. This invention overcomes the problems of high slurry viscosity, equipment blockage, and low product grade caused by the direct fertilizer production of raffinate acid with a simplified process. Furthermore, it coordinates with the disposal of system waste in monoammonium phosphate production, truly achieving high-value utilization and clean production of all components of wet-process phosphoric acid.

A method of forming a granular fertilizer product, the method comprising: forming a first mixture of phosphoric acid and ammonia; adding the first mixture and a halite powder to a granulator to form a second mixture; and providing ammonia to the second mixture to complete the formation of ammonium phosphate within the second mixture while the granulator processes the second mixture to form granules.

The present application relates to resource recycling and wastewater treatment technical field, disclose a kind of method for lithium precipitation mother liquor coproduction lithium phosphate and ammonium magnesium phosphate.Utilize the method, which includes: (1) lithium precipitation mother liquor is separated by nanofiltration membrane, and nanofiltration permeate is obtained;(2) the nanofiltration permeate and phosphorus source are mixed, and the mixture obtained is adjusted to 11.5-13 by lye pH value, carries out first precipitation reaction, and obtains lithium phosphate and phosphorus-containing wastewater;(3) the phosphorus-containing wastewater, magnesium salt and ammonium salt are mixed, and the mixture obtained is adjusted to 9-10.5 by lye pH value, carries out second precipitation reaction, and obtains ammonium magnesium phosphate.The technical scheme realizes the comprehensive resource utilization and harmlessness of lithium precipitation mother liquor, avoids the scaling of lithium carbonate in membrane system, and guarantees the long-term stable operation of membrane system;And create a feasible reaction environment for ammonium magnesium phosphate precipitation method, solve the problem of failure in high carbonate wastewater due to competitive precipitation.

This invention discloses a method for recovering fluoride from white fertilizer while simultaneously preparing slow-release nitro fertilizer, belonging to the field of clean processing and utilization technology of phosphorus resources. This invention uses nitric acid to perform staged acid hydrolysis of white fertilizer. The phosphorus-containing filtrate after preliminary acid hydrolysis has a low impurity content and can be used to prepare water-soluble ammonium phosphate. The remaining acid hydrolysis residue undergoes complete acid hydrolysis to completely leach phosphorus and fluoride elements, followed by defluorination. Fluorine precipitates as fluorosilicates, which can be further separated to obtain fluorosilicate products. The defluorinated liquid is neutralized and dried to obtain the slow-release nitro fertilizer product. This method comprehensively utilizes the phosphorus and fluoride resources in white fertilizer, achieving clean processing and utilization of phosphorus resources. The overall process of the method described in this invention is simple to implement, has low production costs, and fully utilizes the phosphorus and fluoride resources in white fertilizer.

The utility model provides a kind of nitrogen phosphorus recovery device for sewage treatment, comprising: air flotation system, the sewage to be treated enters to air flotation system, the air flotation system is used to form air flotation process, remove residue in sewage;First pH adjusting pool, the sewage after the air flotation system enters the first pH adjusting pool, the first pH adjusting pool is used to adjust sewage to preset pH value.The utility model is by air flotation system and first pH adjusting pool after sewage treatment, in coagulation tank, MgCl2 is added, sewage will occur as follows Reaction Mg 2+ +NH 4+ +PO4 3‑ +6H2O→MgNH4PO4·6H2O↓, so that the struvite "ammonium magnesium phosphate crystal" is generated, then through crystallization pool, sedimentation tank is handled, struvite is separated from sewage, and the struvite separated from sedimentation tank is discharged, to achieve the purpose of recycling struvite.

The present application relates to a high utilization rate compound fertilizer with a protective layer and a preparation method thereof, and belongs to the technical field of agricultural fertilizers. Bio-based polyols prepared by liquefaction of corn cobs are compounded with natural epoxy soybean oil to serve as a coating core raw material. Both of them contain functional groups such as hydroxyl groups and ester groups that can be degraded by soil microorganisms. The membrane shell has a high biodegradation rate, and will not accumulate residues during long-term use. Meanwhile, the polyurethane crosslinking network cooperates with soil microorganisms to maintain soil aggregate structure, improve air and water permeability, effectively avoid soil compaction, and form stable chelates with magnesium and iron ions to avoid the precipitation of trace elements in the soil with clay minerals and phosphate, thereby improving the absorption rate of crops. In combination with the inhibitory effect of urease inhibitors on urease activity, a dual controlled release system of physical barrier and biological inhibition is constructed to prolong the release period of nitrogen and match the nutrient requirements of crops during the growth period.

This invention provides a method for preparing formamide by synergistically treating ammonia nitrogen wastewater and waste PET plastic, belonging to the field of solid waste and wastewater synergistic treatment technology. The method includes the following steps: adding magnesium and phosphate salts to ammonia nitrogen wastewater, adjusting the pH to alkaline for reaction, and obtaining magnesium ammonium phosphate precipitate; heating and decomposing the magnesium ammonium phosphate precipitate, absorbing the ammonia gas generated in the reaction with water to obtain ammonia water; mixing waste PET plastic with an alkaline solution and carrying out a hydrothermal reaction, followed by acidification of the resulting reaction solution, solid-liquid separation, and obtaining a hydrolysate containing ethylene glycol; mixing the ammonia water, the ethylene glycol-containing hydrolysate, and H2SO4 to obtain an electrolyte, using nickel foam loaded with metal / metal oxide as the working electrode, and carrying out an electrolytic reaction to obtain formamide. This invention synergistically utilizes the treatment of ammonia nitrogen wastewater and waste PET plastic, preparing formamide under mild conditions, simultaneously achieving efficient treatment of ammonia nitrogen wastewater and upgraded utilization of waste PET plastic.

This invention discloses a method for preparing magnesium ammonium phosphate (MAP) liquid fertilizer and its application. The steps include: preparing MAP crystals from wastewater by mixing and reacting an aqueous solution containing magnesium ions, ammonium ions, and phosphate ions under pH conditions of 9.0-9.5, followed by settling, washing, and shearing to obtain MAP crystals; subsequently, preparing a suspension by mixing the MAP crystals with deionized water, adding xanthan gum as a dispersant while stirring, subjecting the mixture to high-speed shearing and pH adjustment, and then settling to obtain the MAP liquid fertilizer. This invention uses MAP crystals as raw material and a specific dispersion system to achieve stable and uniform dispersion of MAP crystals in the liquid phase, improving the stability and nutrient distribution uniformity of the liquid fertilizer system, ensuring stable quality and balanced nutrient supply during product storage, transportation, and application. This method forms a novel preparation technology route, filling a gap in the domestic MAP liquid fertilizer preparation field, providing key technical support for its industrialization and large-scale production, and possessing outstanding technical effects and industrial application value.

The invention discloses a method for producing functional diammonium phosphate by using white fertilizer, and belongs to the technical field of diammonium phosphate production. Comprising the following steps that liquid ammonia and mixed acid (the mixed acid is phosphoric acid and waste white fertilizer in the filter pressing production process) react in a reaction chamber to generate slurry, and the reaction slurry is jointly sprayed and granulated on a material curtain of a granulator through a special nozzle and a functional additive conveyed by a functional additive conveying pump. The invention provides a method for producing ammonium phosphate by utilizing medium-low-grade phosphorite with relatively high impurity content. Waste white fertilizer which cannot be treated in the filter pressing production process is used as the raw material, so that the purposes of energy conservation and consumption reduction are achieved; by adding the functional additive, not only are nutrient elements added to crops, but also the soil is improved.

The present disclosure is drawn to anti-fungal pelleted blends, such as blends including multiple types of dry pellets homogenously admixed together. Pellets of the blend may include urea source pellets; ammonium source pellets including ammonium sulfate; phosphorus source pellets including an ammonium phosphate compound; and potassium source pellets including potassium chloride, potassium phosphate, potassium nitrate, potassium sulfate, or a combination thereof. The anti-fungal pelleted blend can be from 90 wt % to 100 wt % dissolvable in water at 20° C. within about 3 minutes. The multiple types of dry pellets may provide a total nitrogen content from 15 wt % to about 40 wt %, a total phosphorus content from about 1.8 wt % to about 8.8 wt %, and a total potassium content from about 4.1 wt % to about 16.6 wt %.

The application provides a super bamboo powder base fuel and a preparation method thereof. The super bamboo powder base fuel comprises uniformly mixed super bamboo powder and a coking inhibitor; the coking inhibitor comprises a magnesium-aluminum composite oxide, a calcium-based sulfur-phosphorus potassium fixation functional component and a bulk agent in a mass ratio of (4-6):(2-3):(2-3); and the calcium-based sulfur-phosphorus potassium fixation functional component is obtained by calcining a mixture of calcium sulfate and an ammonium phosphate salt. By introducing the new coking inhibitor into the super bamboo powder, free alkali metals are adsorbed and fixed, the formation of low-melting-point eutectic compounds at high temperatures is avoided, the generation of coking and ash accumulation is inhibited from the source, and the combustion stability of the super bamboo powder base fuel is effectively improved.

The present application relates to a kind of macroelement water-soluble fertilizer and its preparation method, belong to water-soluble fertilizer field, according to percentage by weight, including urea 25~30%, potassium nitrate 30.0~35.0%, polyphosphate 15~20%, compound chelated state trace metal element 18~20%, potassium phosphite 1.0~2.0%, sodium octaborate 0.1~0.3%;The compound chelated state trace metal element includes calcium nitrate tetrahydrate, magnesium sulfate heptahydrate, ferrous sulfate heptahydrate, zinc sulfate heptahydrate, citric acid monohydrate, tartaric acid, poly-p-glutamic acid, glycine, potassium fulvic acid, mulberry bark extract and radix scrophulariae extract.The trace metal element of the present application is treated by step chelation, and the content of initial chelated state trace element is significantly higher than all the comparative examples, and the macroelement water-soluble fertilizer of the present application can effectively improve crop yield, and reduce the stress resistance of crop.

The application discloses a method for recovering magnesium hydroxide from phosphorus tailings by step-by-step precipitation separation, which comprises the following steps: mixing phosphorus tailings with a sulfuric acid solution and reacting; adding an oxidizing agent to oxidize Fe 2+ into Fe 3+ ; adding an aluminum-containing precipitant, adjusting the pH with an alkaline adjusting agent, and separating the solid from the liquid after the reaction; adding ammonium persulfate, adjusting the pH of the system with an alkaline adjusting agent, and making manganese ions precipitate in the form of manganese dioxide after the reaction; separating the solid from the liquid; and adding an alkaline precipitant, and making magnesium ions precipitate in the form of magnesium hydroxide by adjusting the pH. The application can efficiently remove impurity ions such as phosphate, iron and manganese from the phosphorus tailings acid leaching solution, and can prepare high-purity magnesium hydroxide products. The method simplifies the process flow in the prior art, reduces reagent consumption and operation cost, efficiently removes phosphate and iron ions under low-pH conditions, avoids the generation of ammonium magnesium phosphate in the subsequent process, selectively removes manganese ions, and prevents the problem of co-precipitation when magnesium hydroxide is precipitated.