28results about "Phosphatic fertiliser granulation/pelletisation" patented technology

Dispersible activated bauxite granules are disclosed and methods for forming dispersible activated bauxite granules are disclosed in which bauxite is activated by a granulation process.

A macro-nutrient or mineral fertilizer product including a plurality of fertilizer particles, each including a fertilizer carrier, such as an N / P / K fertilizer, that incorporates a carbon-based additive to enhance particle quality. The carbon-based additive can have a functionalized or activated surface, such as a carbon-black acid with carboxyl groups at its surface. The functionalized surface can react with nutrients in a soil environment in which its dispersed, or both, to enhance the ability for the nutrients to be taken up by a plant. In one example, the carbon-based additive is a dry additive, such as powdered or particulates of carbon-black acid that is incorporated into the fertilizer carrier composition.

This invention relates to the field of fertilizer production technology, specifically to a segmented ripening preparation process for low-free-acid, high-water-soluble superphosphate; the process includes the following steps: feeding phosphate rock powder into a ball mill for grinding to a particle size ≤120 mesh, preparing 93%±0.5% industrial sulfuric acid; adding phosphate rock powder at a molar ratio of available P2O5 to sulfuric acid of 1:1.05~1:1.07, adding 0.3%~0.5% (by weight of phosphate rock powder) of a modifying agent, and reacting at 65~70℃ for 40~50 minutes. In the later stage of the reaction, low-pressure steam of 0.2 MPa is introduced; staged maturation is carried out, first in a closed chamber at 55~60℃ for 24 hours, and then in a ventilated chamber at 45~50℃ and a wind speed of 0.8~1.0 m / s for 48 hours; granulation and screening are carried out, with the granulation drum rotating at 14~16 r / min and tilted at an angle of 3°~5°; through the above methods, the problems of high free acid, low proportion of water-soluble phosphorus and insufficient production efficiency in traditional processes are solved, and the product quality and production capacity are synergistically improved.

1. A method for producing a pelletized fertilizer product, comprising the steps of: producing a first mixture of phosphoric acid and ammonia; adding the first mixture and polyhalite powder to a pelletizer to produce a second mixture; and, while the pelletizer processes the second mixture to produce pellets, supplying ammonia to the second mixture to complete the formation of ammonium phosphate in the second mixture.

There is provided herein a mineral phosphate ash fertilizer comprising a NAC solubility of at least 90% of total amount of P2O5 and a water solubility of 15-80% of the total amount of P2O5.

The present disclosure provides desensitized fertilizer compositions that are resistant to detonation. The desensitized fertilizer compositions of the present disclosure are formed, under heat, from a reaction product of a base fertilizer material, such as ammonium nitrate, and a phosphate-based additive, such as ammonium polyphosphate. The resulting compositions include monoammonium phosphate (MAP), diammonium phosphate (DAP), and polyphosphate crystals distributed throughout the crystalline fertilizer material. The presence of the distributed MAP and DAP crystals is believed to stabilize the base fertilizer material and reduce or eliminate the detonation potential of the fertilizer material.

An oil-based coating for fertilizer granules, the coating impregnated with an alpha-olefin wax additive, and related methods of applying the oil-based coating. The alpha-olefin wax additive increases the viscosity of the oil-based coating and provides a substantial improvement in its moisture resistance, thereby enabling the coating to control or inhibit the formation of dust particles from the fertilizer granules for a longer period of time.

An oil-based coating for fertilizer granules impregnated with an alpha olefin wax additive and related methods of applying the oil-based coating. The alpha olefin wax additive increases the viscosity of the oil-based coating and provides a substantial improvement to moisture resistance, thereby increasing the duration for which the coating is capable of controlling or inhibiting the formation of dust particulates from the fertilizer granules.

The present invention provides a method for obtaining a granular phosphate fertilizer as a phosphorus source for direct use in agriculture from a natural raw material phosphate rock, a carbon source, a metabolism inducer of a phosphorus-solubilizing microorganism, and water.

The invention discloses a system and a method for producing granular nitrophosphate fertilizer by using a nitrophosphate fertilizer concentrated solution, and belongs to the field of chemical engineering. The system comprises a kneading machine, a drying machine, a dry material elevator, a coarse grain sieve, a fine grain sieve, a cooler, a wrapping barrel, a finished product conveyor, a crusher, a returned material conveyor, a wrapping oil storage tank, a wrapping oil pump, a wrapping oil spray head, a wrapping powder storage hopper and a wrapping powder conveyor. The invention aims to decompose phosphorite with nitric acid, the granular nitrophosphate fertilizer which is not easy to absorb moisture and block is produced by the nitrophosphate fertilizer concentrated solution produced by a plurality of production systems, and the whole production process does not produce phosphogypsum, has no phosphogypsum stockpiling problem, and is environment-friendly.

The current invention relates to a method for granulating a slurry in a fluidized bed granulator having a main longitudinal direction from a seed end where granulation is initiated, to a product discharge end where granules are discharged from the fluidized bed granulator, comprising at least one fluidized bed compartment, an injection section and a granulation section, separated by a bottom plate comprising one or more injection nozzles, wherein a feed slurry is provided to the injection section of the fluidized bed granulator, wherein a first fraction of the feed slurry provided to the injection section is injected into the granulation section through the one or more injection nozzles and a second fraction of the feed slurry, being the remainder of the feed slurry, is passed through the injection section without being injected into the granulation section The current invention also concerns a fluidized bed granulator, in particular for the granulation of slurries, more particularly for fertilizer products such as UAS according to the method of the invention.

Disclosed are a multi-coating-structure controlled-release fertilizer and a preparation method therefor, which relate to the field of fertilizers. The multi-coating-structure controlled-release fertilizer comprises fertilizer layers and coating layers which are coated layer by layer, wherein the fertilizer layers and the coating layers are arranged in a spaced manner, at least two fertilizer layers are provided, at least one coating layer is provided, and one of the fertilizer layers is used as a core of the fertilizer; the fertilizer layer contains at least one of a nitrogen fertilizer, a phosphatic fertilizer and a potassic fertilizer, and the coating layer is a polyurea formaldehyde, wherein the polyurea formaldehyde at least contains a polyurea formaldehyde having 2-5 carbon atoms. Elements such as nitrogen, phosphorus, potassium, calcium, magnesium and zinc in the fertilizer can be controlled better to release so as to meet the demands of different crops for different nutrients in different stages of growth. The controlled-release fertilizer is prepared by means of a reaction kettle, a slurry tank, a dusting groove and accessory facilities thereof, and the amount of fertilizer in each layer and the positions at which the fertilizer is coated in whole fertilizer particles can be controlled according to a design program. The whole process can be carried out intermittently, and can also be carried out continuously, and the fertilizer can be produced on a large scale.

Methods for producing solid acidic fertilizer granules, solid acidic fertilizer granules, and methods for their use in fertigation, are disclosed. The method can include providing a plant nutrient containing nitrogen (N), phosphorus (P) and optionally potassium (K), in a container; feeding an acid solution containing an inorganic acid into the container at a feeding rate comprising an average feed rate of 0.2 to 0.8 metric ton of the inorganic acid (MTacid) per hour per metric ton of the plant nutrient (MTnutrient) (MT acid.h−1.MT nutrient−1) and contacting the inorganic acid and the plant nutrient to obtain acidified granules with average moisture content of 0.5 wt. % to 1.0 wt. %; and drying the acidified granules to obtained dried acidic granules.

Embodiments herein generally relate to a process for producing a solid phosphate fertilizer comprising micronized elemental sulfur. The process of producing a solid fertilizer comprises the steps of: (a) combining micronized sulfur with one or both of phosphate rock and phosphoric acid; (b) reacting the phosphate rock and phosphoric acid to produce TSP mixed with micronized sulfur particles; and (c) granulating the TSP and micronized sulfur into fertilizer granules.

Embodiments described herein provide systems and methods for phosphate processing systems having integrated subsystems, such as a phosphoric acid plant, a precipitation system, a crystallizer system, a flushing system, a granulation system, a pond water system, an organic matter removal system, and / or an exhaust treatment system. Such subsystems can be integrated with each other by using one or more output streams from one or more subsystems as one or more input streams for one or more subsystems. In some embodiments, for example, a phosphate processing system can produce phosphoric acid, a fertilizer containing struvite, a fertilizer using the struvite recovered, a composition containing magnesium or fluoride using the magnesium or fluoride recovered, and other components using phosphoric acid collected from phosphoric acid and gypsum compositions or using sludge collected from waste streams.

A process of plant fertilization includes adsorbing phosphorus from an anthropogenic phosphorus source onto a plurality of particles of phosphorus adsorbent and then applying the plurality of particles of phosphorus adsorbent to a plant medium. A composition includes a soil amendment and a plant medium. The soil amendment includes a plurality of particles of phosphorus adsorbent and phosphorus from an anthropogenic phosphorus source adsorbed onto the particles. A process includes adsorbing a first amount of phosphorus from a phosphorus source onto a plurality of particles of phosphorus adsorbent to saturate the particles of phosphorus adsorbent with phosphorus. The process also includes processing the particles to maintain the first amount of phosphorus on the particles and permit additional adsorption of phosphorus onto the particles. The process further includes adsorbing an additional amount of phosphorus from the phosphorus source onto the particles to saturate the particles with phosphorus.

The present invention relates to the use of a liquid formulation for coating granular materials, said formulation comprising at least one oil a renewable origin and at least one anionic surfactant comprising at least one functional group having one or more heteroatom(s), the electronegativity of which is strictly less than 2.5. The present invention further relates to the granular material coated with said liquid formulation.

The present invention relates to the use of a liquid formulation for coating granular materials, said formulation comprising at least one oil of renewable origin and at least one anionic surfactant comprising at least one functional group having one or more heteroatom(s), the electronegativity of which is strictly less than 2.5. The present invention further relates to the granular material coated with said liquid formulation.

The present invention relates to a soil treatment composition, product, system, kit and method for increasing the amount, level, ratio or proportion of soluble and / or bioavailable phosphorus in soil; for dissolving phosphorus; for enhancing or increasing the bioavailability of phosphorus in soil; for improving soil fertility; for increasing crop yields; for reducing the need for phosphate fertilizers, etc. The present invention also relates to a bioactive fertilizer composition and related methods for increasing phosphorus solubility and / or bioavailability in soil.

Embodiments of the present invention generally relate to a method of producing a solid phosphate fertilizer comprising micronized elemental sulfur. A method of producing a solid fertilizer includes the steps of: (a) mixing micronized sulfur with one or both of phosphate ore and phosphoric acid; (b) reacting phosphate ore with phosphoric acid to generate TSP mixed with micronized sulfur particles; and (c) granulating the TSP and the micronized sulfur into fertilizer granules.

There is provided herein a mineral phosphate ash fertilizer comprising a NAC solubility of at least 90% of total amount of P2O5 and a water solubility of 15-80% of the total amount of P2O5.

The present invention relates to a fertilizer composition containing a carbon-based additive, the fertilizer composition being a macronutrient or mineral fertilizer product comprising a plurality of fertilizer granules, each containing a fertilizer carrier, such as an N / P / K fertilizer, for introducing a carbon-based additive for enhancing the mass of the granules, and a process for preparing the same. The carbon-based additive may have a functionalized or activated surface, such as a carbon black acid having a carboxyl group on the surface. The functionalized surface can react with the nutrients or both in the soil environment in which it is dispersed, thereby enhancing the absorption capacity of the plant nutrients. In one example, the carbon-based additive is a dry additive, such as powdered or particulate carbon black acid, incorporated into a fertilizer carrier composition.

A macro-nutrient or mineral fertilizer product including a plurality of fertilizer particles, each including a fertilizer carrier, such as an N / P / K fertilizer, that incorporates a carbon-based additive to enhance particle quality. The carbon-based additive can have a functionalized or activated groups, such as a carbon-black acid with carboxyl groups at its surface. The functionalized surface can react with nutrients in a soil environment in which its dispersed, or both, to enhance the ability for the nutrients to be taken up by a plant. In one example, the carbon-based additive is a dry additive, such as powdered or particulates of carbon-black acid that is incorporated into the fertilizer carrier composition.

According to some embodiments, there is provided herein a granule comprising Kieserite and one or more additives selected from the group including phosphate rock, Ammonium sulphate and Ammonium Nitrate, in a ratio of between 30:70 to 70:30, respectively.

Disclosed are methods for preparing solid acidic fertilizer granules, solid acidic fertilizer granules, and methods for using the same in fertigation. The methods may include providing plant nutrients containing nitrogen (N), phosphorus (P), and optionally potassium (K) in a container; feeding an acid solution containing a mineral acid at an average feed rate of 0.2 to 0.8 metric tons of mineral acid (MT acid) per metric ton of plant nutrients (MT nutrient) per hour (MT acid·h ‑1 MT nutrients ‑1 ) into a container at a feed rate of 1.5 wt % to 2.5 wt % to contact the inorganic acid and the plant nutrients to obtain acidified granules having an average moisture content of 0.5 wt % to 1.0 wt %; and drying the acidified granules to obtain dried acidic granules.

The invention provides an aquaculture wastewater phosphorus resource recovery method based on struvite process mediation, relates to the technical field of livestock and poultry breeding waste recycling and sewage treatment, is applied to an aquaculture wastewater phosphorus resource recovery system, and comprises the following steps: roughly filtering biogas slurry, and then feeding the biogas slurry into a microwave ultrasonic coupling reactor for pretreatment; a magnesium source is added into the pretreated biogas slurry, the pH is adjusted to be alkaline, and the adjusted mixed solution sequentially passes through a primary seed crystal generator, a pulse microwave regulation and control device and a secondary crystal growth reactor to generate struvite crystals; carrying out spiral extrusion dehydration, cutting granulation and spraying coating on the slurry containing struvite crystals to obtain coated slow-release fertilizer particles and separated supernate; wherein the supernate is sent to an adsorption column, and secondary recovery of phosphorus resources is carried out through regeneration of an adsorbent. Therefore, efficient recovery of phosphorus resources, deep purification of wastewater and high value of products are realized.

Coherent dispersible granules are disclosed including at least one metal oxide domain and at least one phosphate domain, wherein the at least one metal oxide domain and the at least one phosphate domain are present in the coherent dispersible granules as distinct domains coherently agglomerated together and the coherent dispersible granules have a coherent dispersible granule crush strength of at least 5 lbf. Methods for forming the coherent dispersible granules are disclosed, including co-agglomerating at least one of ammonium phosphate, superphosphate slurry, or nitrophosphate slurry and the metal oxide particles in a rotary drum ammoniator-granulator or granulator to form coherent dispersible granules, and drying the coherent dispersible granules.