58results about "Phosphatic fertiliser granulation/pelletisation" patented technology

A phosphate-enriched, heavy metal-depleted fertilizer granulate includes at least one inorganic secondary phosphate, which is produced by a two-stream process, wherein a raw material dispersion is fed to process stream A and process stream B, in which this raw material dispersion either is produced in process step a) from at least one inorganic secondary phosphate and at least one reactant and this produced raw material dispersion is fed divided to process stream A and B or in process step a′) the inorganic secondary phosphate is first divided, are produced separately from one another and these separately produced raw material dispersions are fed to process stream A and B. The proportion of a liquid phase is greater than 30% and the incubation time between inorganic secondary phosphate and reactant is between 1 to 100 minutes.

The invention discloses a method for granulating a phosphate tailing, phosphate tailing particles prepared therefrom, and applications thereof, and belongs to the technical field of waste resource recovery and safe utilization. The method for granulating a phosphate tailing of the invention comprises the following steps: uniformly mixing tannic acid, lignin sulfonate, and tea saponin to obtain a composite binder; uniformly mixing the composite binder with the phosphate tailing powder to perform granulation, wherein the tannic acid and lignin sulfonate undergo a complex reaction, and the tea saponin increases fluidity and surface activity, so that the composite binder penetrates into the interior of the phosphate tailing powder to exert a bonding effect, thereby preparing phosphate tailing particles. The phosphate tailing particles prepared by the invention have excellent granulation rate, particle strength, and solubility.

The invention belongs to the technical field of chemical product preparation, and provides a production method of instant expanded monopotassium phosphate. The method comprises the following steps: (1) neutralization: neutralizing a potassium hydroxide solution and a phosphoric acid solution to prepare monopotassium phosphate slurry; (2) spray drying: performing sectional drying on the monopotassium phosphate slurry in a vertical high-tower spray drying tower, wherein the vertical high-tower spray drying tower is set into a top high-temperature section, a middle shaping section and a bottom cooling section according to the length ratio from top to bottom, and high-temperature hot air is arranged at an inlet of the top high-temperature section; low-temperature hot air is supplemented into the joint of the middle shaping section and the top high-temperature section; separating, dedusting and recycling at an outlet of the bottom cooling section to obtain monopotassium phosphate primary product particles; and (3) cooling and screening to obtain a finished product. According to the production method, low-energy-consumption and high-efficiency production is realized through sectional type high tower spray drying, and the instant puffed monopotassium phosphate product with high puffing rate and high stability can be obtained.

The invention relates to a process for producing fertilizer granules (2) and a granulation plant (1) suitable for carrying out the process.

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 invention relates to a phosphate-enriched, heavy-metal depleted granular fertilizer from at least one inorganic secondary phosphate that is produced in a double-strand method. According to the method, a raw material dispersion is supplied to process strand A and to process strand B by either producing the raw material dispersion in process step a) from at least one inorganic secondary phosphate and at least one reagent and supplying the raw material dispersion so produced to process strand A and B separately, or first separating the inorganic secondary phosphate in process step a, a'), producing two raw material dispersions (comprising each a partial amount of the at least one inorganic secondary phosphate and at least one reagent) separately from each other and supplying these separately produced raw material dispersions to process strand A and B, wherein the liquid phase content of the raw material dispersion is greater 30% and the incubation time between the inorganic secondary phosphate and the reagent is between 1 to 100 minutes, wherein process strand A comprises the following process steps, i) adding a heavy-metal precipitating agent during the production of the raw material dispersion and / or during the incubation time and / or after the incubation time, j) separating part of the phosphate-containing liquid phase of the raw material dispersion that is low in heavy metal and removing the remaining heavy-metal containing filter cake from the process, k) precipitating phosphate from the phosphate-containing liquid phase, l) separating the precipitated phosphate and returning the separated liquid phase to process step a) to produce a raw material dispersion, wherein process step B comprises the following process steps m) separating part of the liquid phase of the raw material dispersion, n) producing a mixture from at least part of the precipitated phosphate produced in process strand A and at least part of the remaining raw material dispersion with reduced liquid phase from process step f) and granulating and / or extruding the mixture so produced, wherein the produced granular and / or extruded material can be dried or coated, and removing the produced heavy-metal depleted granular fertilizer from the process, o) returning the liquid phase separated in process step f) in order to produce a raw material dispersion in analogy to process step a) and / or supplying it to process step g), wherein heavy metals can be at least partially removed from the liquid phase separated in process step f) and these heavy metals can be removed from the process previously, and repeating process steps a) to h).

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.

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, including at least one fluidized bed compartment, an injection section and a granulation section, separated by a bottom plate including one or more injection nozzles, wherein a feed slurry is provided to the injection section, 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. A fluidized bed granulator for the granulation of slurries for fertilizer products such as UAS according to the method of the invention.

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 present invention relates to a method of obtaining a disaggregable granulated calcium and / or magnesium and potassium fertilizer, wherein the method comprises the steps of choosing, preparing and mixing the sources of calcium and / or magnesium and potassium, optionally the addition of chelating agents, optionally the addition of micro and / or macro nutrients, granulation and drying. The present invention further relates to a disaggregable granulated calcium and / or magnesium and potassium fertilizer.

Fertilizer granules containing elemental sulfur and a hydrogel which expands or swells in the soil to more readily disperse the elemental sulfur surface throughout the soil, which increases the elemental sulfur surface area available for oxidation, and ultimately uptake of sulfur by the plant. The elemental sulfur and hydrogel can be added to a fertilizer composition as either an exterior coating or co-granulated with the base fertilizer composition.

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 invention relates in one aspect to a process for producing a coated phosphate-containing fertilizer comprising the following steps: a) mixing a phosphate-containing starting material with at least one mineral acid, wherein the phosphate-containing starting material comprises at least one ash from the combustion of sewage sludge and / or animal excrement; b) incubating the mixture obtained in step a); c) granulating the mixture of acid and phosphate-containing starting material incubated in b); d) completely or partially drying the granules obtained in step c); e) coating the completely or partially dried granules from step d) with a liquid phosphate-containing suspension, wherein the process is characterized in that the mineral acid in step a) is present in a 0.2-fold to 1.5-fold stoichiometric ratio, preferably in a 1-fold to 1.5-fold stoichiometric ratio.is added to the phosphorus contained in the phosphate-containing starting material.

The invention relates to a method for producing fertilizer granules (2) and to a granulation system (1) suitable for carrying out the method.

The invention discloses a method for preparing iron phosphate and a byproduct fertilizer by using ammonium phosphate, a granulation device for producing the byproduct fertilizer comprises a shell with an accommodating space, and the accommodating space of the shell is sequentially divided into a granulation cavity, a material screening cavity and a material temporary storage cavity from top to bottom; an air blowing assembly is arranged between the granulation cavity and the material screening cavity, a vibrating screen capable of vertically moving in a reciprocating mode is arranged between the material screening cavity and the material temporary storage cavity, the material temporary storage cavity is communicated with a discharging pipe, and an end cover is further detachably arranged at the upper end of the shell; the end cover is provided with a plurality of material spraying devices used for spraying fused materials into the shell, and the end cover is further communicated with an exhaust pipe. The blowing assembly comprises a plurality of distribution pipes which are arranged in a staggered mode and communicated with one another, the upper ends of the distribution pipes are communicated with a plurality of air blowing pipes, and one sides of the distribution pipes are further communicated with air inlet pipes. The method not only improves the removal rate of acid insoluble substances in the phosphate concentrate, but also improves the quality of the nitrophosphate fertilizer prepared from the by-product.

The invention relates to a method for producing fertilizer granules by injecting starting materials into a moving particle reservoir of a fluidization apparatus using at least one multi-component nozzle (1), wherein the starting material is an acid and a suspension containing a phosphate-containing raw material, which are atomized as a spray jet (5) in the moving particle reservoir by the multi-component nozzle (1), so that the starting materials react with each other in the spray jet (5) and the fertilizer granules are formed in the spray jet (5).

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.

To provide a method of producing ferric phosphate and a byproduct fertilizer using ammonium phosphate.SOLUTION: A byproduct fertilizer production granulator used in the method, comprises a housing comprising a storage space. The storage space of the housing is successively divided into a granulation chamber, a screening chamber and a material storage chamber from top to bottom. A blow assembly is provided between the granulation chamber and the screening chamber. A vibration screen reciprocally movable in the vertical direction is provided between the screening chamber and the material storage chamber. A material discharge pipe is connected to the material storage chamber. A top cap is detachably attached on the upper end of the housing. A plurality of sprayers are provided on the top cap to spray a molten material into the housing. An exhaust pipe is connected to the top cap. The blow assembly includes mutually connected distribution pipes arranged in a zigzag shape. A plurality of air-ducts are connected to the upper end of the distribution pipes. An air introduction pipe is connected to one side of a distribution pipe.SELECTED DRAWING: Figure 1

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.