CN111018627A - Composite fertilizer containing polymorphic nitrogen and manufacturing method thereof - Google Patents
Composite fertilizer containing polymorphic nitrogen and manufacturing method thereof Download PDFInfo
- Publication number
- CN111018627A CN111018627A CN202010133152.4A CN202010133152A CN111018627A CN 111018627 A CN111018627 A CN 111018627A CN 202010133152 A CN202010133152 A CN 202010133152A CN 111018627 A CN111018627 A CN 111018627A
- Authority
- CN
- China
- Prior art keywords
- fertilizer
- nitrogen
- granular
- nitrate
- phosphate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B7/00—Fertilisers based essentially on alkali or ammonium orthophosphates
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B11/00—Fertilisers produced by wet-treating or leaching raw materials either with acids in such amounts and concentrations as to yield solutions followed by neutralisation, or with alkaline lyes
- C05B11/04—Fertilisers produced by wet-treating or leaching raw materials either with acids in such amounts and concentrations as to yield solutions followed by neutralisation, or with alkaline lyes using mineral acid
- C05B11/06—Fertilisers produced by wet-treating or leaching raw materials either with acids in such amounts and concentrations as to yield solutions followed by neutralisation, or with alkaline lyes using mineral acid using nitric acid (nitrophosphates)
Abstract
The invention relates to a compound fertilizer containing various nitrogen and a manufacturing method thereof, wherein the nitrogen is derived from urea and a fertilizer containing nitrate nitrogen, the surface of granular urea and the granular fertilizer containing nitrate nitrogen is coated with a layer of separant containing medium trace elements under the action of a binder, and then the mixture containing phosphate fertilizer and potash fertilizer is coated by the binder, the mixture of granular urea, granular fertilizer containing nitrate nitrogen, separant, phosphate fertilizer and potash fertilizer is 100 parts, 20-200 parts, 15-55 parts and 60-140 parts by weight, the compound fertilizer containing polymorphic nitrogen can simultaneously provide polymorphic nitrogen such as urea nitrogen and nitrate nitrogen, the form compatibility of fertilizer nutrients is reasonable and diversified, the requirements of plants on different nutrient elements and forms are met, the technical problems that the urea nitrogen and the nitrate nitrogen cannot be mixed and coexist, the moisture absorption point is low and the process cannot be realized in the long-term industry are solved, meets the agricultural requirements and the process requirements of industrial production.
Description
Technical Field
The invention relates to a compound fertilizer and a production method thereof, in particular to a compound fertilizer containing various forms of nitrogen fertilizers and moderate nutrient elements and a manufacturing method thereof.
Background
The fertilizer is indispensable production data of agricultural production, the yield and consumption of the fertilizer in China are the first place in the world, the fertilizing amount per unit area is nearly 4 times of the average level in the world, and excessive fertilizer investment not only consumes a large amount of resources and increases agricultural cost, but also causes environmental pollution.
With the progress of agricultural modernization, agricultural fertilization has shifted from the application of simple fertilizer to the application of compound fertilizer, and the production of compound fertilizer has also shifted from general to crop-specific. The special compound fertilizer for crops is a novel compound fertilizer with nutrient components and nutrient forms designed according to the fertilizer absorption rule of crops and by combining the nutrient supply condition of soil, can meet the requirement of the crops on the nutrient content, and focuses on the composition of the nutrient forms, for example, a nitrogen fertilizer is matched by ammonium nitrogen, amide nitrogen and nitrate nitrogen according to a reasonable proportion. Thereby promoting the growth of crops, improving the utilization rate of the fertilizer and reducing the using amount of the fertilizer.
The form of nitrogen fertilizer is mainly amide nitrogen represented by urea, ammonium nitrogen represented by ammonium sulfate and ammonium chloride, and nitrate nitrogen represented by ammonium nitrate, ammonium phosphate and nitrophosphate, but because of the basic properties of these compounds, when urea is mixed with most fertilizers containing nitrate nitrogen, the critical relative humidity of the mixture for absorbing moisture is greatly reduced, and when urea is mixed with ammonium nitrate, the critical relative humidity is only 18.1%. Therefore, if the compound fertilizer contains urea and the fertilizer containing nitrate nitrogen, serious moisture absorption can occur under most environmental conditions, and the production, storage and transportation and application of the compound fertilizer are influenced. Meanwhile, the production of the compound fertilizer by taking nitrate nitrogen and amide nitrogen as raw materials is a difficult problem of the industry, and the compound fertilizer is definitely classified into a nitro compound fertilizer and a urea-based compound fertilizer in the actual production process. However, many crops need to provide the nutrition of nitrate nitrogen, and the production of compound fertilizers by only using ammonium nitrogen and nitrate nitrogen as nitrogen fertilizer raw materials is difficult to meet the requirement of the total nitrogen content in the compound fertilizers, so the technology for producing the compound fertilizers simultaneously containing three types of nitrogen is a difficult problem to be solved urgently in the compound fertilizer industry.
Chinese patent document CN201310135131.6 (publication No. CN 103193535A) discloses a quick-acting slow-release compound fertilizer and a preparation method thereof. Adding raw materials containing nitrate nitrogen, ammonium nitrogen and amide nitrogen into the materials, directly introducing gaseous ammonia into a material layer of a rotary drum granulator, completing ammoniation treatment of ammonium nitrate phosphorus, and controlling the quality of urea nitrate generated by reaction. The effective proportion of the quick-acting slow-release compound fertilizer is that the nitrogen content of the product is calculated by mass percent: 2% -5% of nitrate nitrogen: 6% -9% of ammonium nitrogen: 7 to 11 percent of amide nitrogen. The content of phosphorus and potassium nutrients is determined according to different product proportions. Although the method can produce the compound fertilizer containing three types of nitrogen, the method cannot fundamentally solve the direct contact between urea and ammonium nitrate raw materials (ammonium nitrate phosphorus and nitric phosphate fertilizer), and the problem of strong hygroscopicity is not solved well.
Chinese patent document 201610044735.3 (publication No. CN 105503280A) discloses a method for producing a granular compound nitrogen fertilizer, which is characterized in that ammonium nitrate fertilizer granules or ammonium nitrate phosphorus fertilizer granules are fluidized and preheated to 40-60 ℃, liquid urea or urea melt is sprayed on the preheated fertilizer granules and wrapped on the fluidized fertilizer granules for granulation to prepare the granular compound nitrogen fertilizer containing three types of nitrogen.
In order to meet the requirements of modern agriculture on compound fertilizers, a compound fertilizer product containing nitrogen fertilizers in various forms and moderate nutrient elements and a production method thereof are urgently needed.
Disclosure of Invention
The invention aims to overcome the technical problems in the prior art and provide a compound fertilizer containing various forms of nitrogen and a manufacturing method thereof, which can meet the agricultural requirements and the industrial production process requirements by firstly coating granular urea and granular fertilizer containing nitrate nitrogen with a separant containing a medium element under the action of a binder so that the granular urea and the granular fertilizer cannot be directly contacted with each other and then coating a phosphate fertilizer and a potash fertilizer on the outer layer to meet the requirements of crops on various nutrients and fundamentally solve the problem that the compound fertilizer containing polymorphic nitrogen is easy to absorb moisture.
The purpose of the invention is realized as follows:
a composite fertilizer containing polymorphic nitrogen comprises nitrogen derived from granular urea and granular nitrate nitrogen-containing fertilizers, wherein under the action of a binder, a layer of separant containing medium trace elements is coated on the surfaces of granules of the granular urea and the granular nitrate nitrogen-containing fertilizers, a mixture of a phosphate fertilizer and a potash fertilizer is coated outside the separant through the binder, the proportion of nitrogen, phosphorus and potassium and the proportion of nitrogen fertilizers in various forms can be adjusted according to nutrient requirement rules and production requirements of different crops, and the granular urea, the granular nitrate nitrogen-containing fertilizers, the separant, the mixture of the phosphate fertilizer and the potash fertilizer are 100 parts, 20-200 parts, 15-55 parts and 60-140 parts respectively in parts by mass.
Further, the granular nitrate nitrogen-containing fertilizer is a nitrate-containing granular fertilizer containing ammonium phosphate, nitrophosphate, calcium ammonium nitrate and potassium nitrate, or a granular fertilizer prepared by mixing a plurality of nitrate-containing fertilizers selected from the group consisting of the ammonium phosphate, the nitrophosphate, the calcium ammonium nitrate and the potassium nitrate in any ratio.
Further, the granular nitrate-nitrogen-containing fertilizer is preferably selected from ammonium phosphate nitrate or nitrophosphate; further preferably from ammonium phosphorus nitrate.
Further, the binder is P with the mass concentration of 25-45%, or 30-42%, or 35-40%2O5Phosphoric acid, sulfuric acid with the mass concentration of 20-40%, and P with the mass concentration of 25-45%, 30-40% or 32-35%2O5One or more of the phosphoric acid sludge acids are mixed in any ratio, and the binder is added in such an amount that the surfaces of the granules are uniformly wetted.
Further, the isolating agent containing the medium trace elements is one or a mixture of more of calcium magnesium phosphate fertilizer, yellow phosphorus water-quenched slag, light-burned magnesium or calcined dolomite powder which are crushed to pass through a test sieve of 80-120 meshes in any ratio, and the calcium magnesium phosphate fertilizer or the light-burned magnesium is preferred.
Further, the mixture of the phosphate fertilizer and the potash fertilizer is prepared by mixing two or more of monoammonium phosphate or calcium magnesium phosphate and potassium sulfate or potassium chloride in any ratio, and the mixture of the phosphate fertilizer and the potash fertilizer is crushed to be fine and passes through a test sieve of 80-120 meshes.
The manufacturing method of the compound fertilizer containing polymorphic nitrogen comprises the following steps:
step 1), respectively metering a certain amount of granular urea and granular fertilizer containing nitrate nitrogen according to a formula design, adding the metered granular urea and the granular fertilizer into a coating granulator together, spraying a binder immediately, adding a release agent until the surface of the granules is uniformly wetted, adhering the release agent to the surface of the granular fertilizer and drying the surface of the granular fertilizer, and repeating the process until the release agent with the set amount is completely coated on the surface of the granular fertilizer;
step 2), continuously spraying a binder on the surface of the granular fertilizer wrapped with the separant, adding a mixture of a phosphate fertilizer and a potash fertilizer which is metered according to a formula and crushed to a fineness requirement, and repeating the process until the surface is dried until the specified amount of the mixture of the phosphate fertilizer and the potash fertilizer is completely added;
step 3), conveying the wrapped fertilizer to a dryer for drying, and controlling the drying temperature to ensure that the temperature of the fertilizer is not higher than 75 ℃ and the free water in the fertilizer is dried to be lower than 2%;
step 4), conveying the dried material to a cooling machine for cooling, and cooling the temperature of the fertilizer to be below 45 ℃;
and 5) conveying the cooled fertilizer to a sieving machine, and sieving out particles with the granularity not meeting the requirement to obtain the compound fertilizer containing polymorphic nitrogen.
The wrapping granulator is a conventional disc granulator or a modified disc granulator; the dryer, the cooler, the screening machine and related material conveying and metering equipment thereof all adopt conventional compound fertilizer production equipment.
The invention has the following positive effects: the invention uses the separant containing the medium elements, the granular urea and the granular fertilizer containing nitrate nitrogen are simultaneously coated by the separant under the action of the binder, so that the granular urea and the granular fertilizer cannot be in direct contact, and the phosphate fertilizer and the potash fertilizer are coated on the outer layer, so as to meet the requirements of crops on various nutrients, fundamentally solve the problem that the compound fertilizer containing polymorphic nitrogen is very easy to absorb moisture, simultaneously provide polymorphic nitrogen such as urea nitrogen and nitrate nitrogen, and the like, have diversified nutrient forms, meet the requirements of plants on different nutrient element forms, realize the reasonable compatibility of the nutrient forms of the compound fertilizer, solve the technical problems that the urea nitrogen and the nitrate nitrogen cannot be mixed and coexist, the moisture absorption point is low, and the process cannot be realized in the process, which troubles the compound fertilizer industry for a long time, meet the agricultural requirements and the process requirements of industrial production, and become the compound fertilizer containing. The polymorphic nitrogen compound fertilizer does not absorb moisture under the condition that the relative humidity is 55 percent, and greatly improves the moisture absorption resistance compared with the urea nitrogen and nitrate nitrogen which easily absorb moisture under the relative humidity of 18.1 percent, thereby reaching or exceeding the moisture absorption resistance level of the common compound fertilizer.
The polymorphic nitrogen compound fertilizer can provide polymorphic nitrogen nutrient elements, has a certain nitrogen slow release function, has stable and lasting fertilizer effect release, can provide continuous nutrition in the plant growth period, has good fertilizer effect, high nutrient utilization rate and low cost, is an all-inorganic nutrient, can simultaneously supplement the multiple nutrient elements such as nitrogen, phosphorus, potassium, calcium, magnesium, silicon and the like required by plants, has the advantages of simpler fertilization process and capability of improving the soil structure and the soil environment, has reasonable and diversified nutrient form compatibility, meets the requirements of the plants on different nutrient elements and forms, solves the problem that the urea is directly contacted with ammonium nitrate raw materials (ammonium nitrate phosphorus and nitric phosphate fertilizer) to have strong hygroscopicity, and fundamentally solves the technical problems that the urea nitrogen and the nitrate nitrogen in the long-term industrial urea nitrogen compound fertilizer cannot be mixed and coexist, have low moisture absorption point and cannot be realized in the process, meets the agricultural requirements and the process requirements of industrial production.
Detailed Description
The invention is further illustrated by the following examples.
Example 1: a compound fertilizer containing polymorphic nitrogen, wherein the nitrogen contained in the compound fertilizer is derived from granular urea and granular nitrate nitrogen-containing fertilizers, a layer of separant containing medium trace elements is coated on the surfaces of the granules of the granular urea and the granular nitrate nitrogen-containing fertilizers under the action of a binder, a mixture of a phosphate fertilizer and a potash fertilizer is coated outside the separant through the binder, the proportion of nitrogen, phosphorus and potassium and the proportion of nitrogen fertilizers in various forms can be adjusted according to nutrient requirement rules and production requirements of different crops, and the granular urea, the granular nitrate nitrogen-containing fertilizers, the separant, the mixture of the phosphate fertilizer and the potash fertilizer are 100 parts, 125 parts, 55 parts and 140 parts respectively in parts by mass. The granular nitrate nitrogen-containing fertilizer is granular ammonium phosphate (32-4-0), and the binder is selected from P-containing fertilizers with mass concentration2O537 percent of phosphoric acid, the amount of the added binder is based on uniform wetting of the particle surface, the separant containing medium trace elements is selected from light-burned magnesium crushed to pass through an 80-120-mesh test sieve, the mixture of the phosphate fertilizer and the potash fertilizer consists of 35 parts by mass of monoammonium phosphate and 105 parts by mass of potassium chloride, and the mixture of the phosphate fertilizer and the potash fertilizer needs to be crushed to pass through the 80-120-mesh test sieve.
The production steps of the compound fertilizer containing polymorphic nitrogen are as follows:
step 1), respectively metering 100 parts by mass of granular urea and 125 parts by mass of granular ammonium phosphate nitrate (32-4-0), simultaneously adding the metered granular urea and the granular ammonium phosphate nitrate into a disc-type wrapping granulator, and spraying a binder onto the surfaces of the fertilizer granules in a mist form, wherein the binder is prepared in advance and contains P2O5Phosphoric acid with mass fraction of 37 percent is added until the surface of the fertilizer particles is uniformly wetted, and a proper amount of light-burned magnesium which is measured as a separant is added to ensure that the light-burned magnesium is uniformly adhered to the surface of the nitrogen fertilizer particles and the surface is dried; and spraying a proper amount of binder to wet the surfaces of the particles, adding a proper amount of light-burned magnesium, and repeating the process until all 55 parts of light-burned magnesium are added.
And 2) continuously spraying a binder to wet the surfaces of the particles, adding a metered phosphorus-potassium fertilizer which consists of 35 parts by mass of monoammonium phosphate and 105 parts by mass of potassium chloride and is crushed to the required fineness, wrapping the phosphorus-potassium fertilizer on the surfaces of the particles, drying the particles, and repeating the process until all the phosphorus-potassium fertilizer is completely added to obtain a semi-finished product of the compound fertilizer containing polymorphic nitrogen.
And 3) conveying the wrapped fertilizer to a dryer for drying, and controlling the drying temperature to ensure that the temperature of the fertilizer is not higher than 75 ℃ and the free water in the fertilizer is dried to be lower than 2%.
And 4) conveying the dried material to a cooling machine for cooling, and cooling the temperature of the fertilizer to be below 45 ℃.
And 5) conveying the cooled fertilizer to a sieving machine, and sieving out particles with the granularity not meeting the requirement to obtain the compound fertilizer containing polymorphic nitrogen.
The composite fertilizer containing polymorphic nitrogen prepared in the embodiment comprises the following components: total nitrogen content of 18%, wherein amide nitrogen is 9.2%, ammonium nitrogen is 4.8%, nitrate nitrogen is 4.0%, and available phosphorus content (expressed as P)2O5Calculated as K) 10%, potassium content (in K)2Calculated by O) 12 percent and contains 5 to 6 percent of effective magnesium oxide.
The product does not absorb moisture under the relative humidity of 55 percent, and reaches or exceeds the moisture absorption resistance level of the common compound fertilizer.
Example 2: a compound fertilizer containing polymorphic nitrogen, wherein the nitrogen contained in the compound fertilizer is derived from granular urea and granular nitrate nitrogen-containing fertilizers, a layer of separant containing medium trace elements is coated on the surfaces of the granules of the granular urea and the granular nitrate nitrogen-containing fertilizers under the action of a binder, a mixture of a phosphate fertilizer and a potash fertilizer is coated outside the separant through the binder, the proportion of nitrogen, phosphorus and potassium and the proportion of nitrogen fertilizers in various forms can be adjusted according to nutrient requirement rules and production requirements of different crops, and the granular urea, the granular nitrate nitrogen-containing fertilizers, the separant, the mixture of the phosphate fertilizer and the potash fertilizer are 100 parts, 43 parts and 60 parts respectively in parts by mass. The granular nitrate nitrogenThe fertilizer is granular ammonium phosphate (32-4-0), and the binder is selected from P-containing fertilizers with mass concentration2O537 percent of phosphoric acid sludge acid, the amount of the added binder is based on uniform wetting of the surface of the granules, and the release agent containing medium and trace elements is selected from calcium magnesium phosphate fertilizer (containing 15 percent of P) crushed to pass through an 80-120 mesh test sieve2O5) The mixture of the phosphate fertilizer and the potash fertilizer only consists of 60 parts by mass of potassium chloride, and the mixture of the phosphate fertilizer and the potash fertilizer needs to be crushed until the fineness of the mixture passes through a test sieve of 80-120 meshes.
The production steps of the compound fertilizer containing polymorphic nitrogen are as follows:
step 1), respectively metering 100 parts by mass of granular urea and 43 parts by mass of granular ammonium phosphate nitrate (32-4-0), simultaneously adding the metered granular urea and the granular ammonium phosphate nitrate into a disc-type wrapping granulator, and spraying a binder onto the surfaces of the fertilizer granules in a mist form, wherein the binder is prepared in advance and contains P2O537 percent of phosphoric acid sludge acid by mass until the surface of the fertilizer particles is uniformly wetted, and a proper amount of calcium magnesium phosphate fertilizer (containing 15 percent of P) serving as a separant is added2O5) The calcium magnesium phosphate fertilizer is uniformly adhered to the surface of the nitrogen fertilizer particles, and the surface is dried; spraying a proper amount of adhesive to wet the surfaces of the granules, adding a proper amount of calcium magnesium phosphate fertilizer, and repeating the process until all the calcium magnesium phosphate fertilizer is added.
And 2) continuously spraying the binder to wet the surfaces of the granules, adding a proper amount of metered potassium chloride (powder is crushed to required fineness) to coat the potassium chloride on the surfaces of the granules, drying the granules, and repeating the process until all the potassium chloride is added to obtain the semi-finished product of the compound fertilizer containing the polymorphic nitrogen.
And 3) conveying the wrapped fertilizer to a dryer for drying, and controlling the drying temperature to ensure that the temperature of the fertilizer is not higher than 75 ℃ and the free water in the fertilizer is dried to be lower than 2%.
And 4) conveying the dried material to a cooling machine for cooling, and cooling the temperature of the fertilizer to be below 45 ℃.
And 5) conveying the cooled fertilizer to a sieving machine, and sieving out particles with the granularity not meeting the requirement to obtain the compound fertilizer containing polymorphic nitrogen.
The composition of the compound fertilizer containing polyepitical nitrogen prepared in the embodiment is as follows: total nitrogen content of 20%, wherein amide nitrogen is 15.2%, ammonium nitrogen is 2.4%, nitrate nitrogen is 2.4%, and available phosphorus content (expressed as P)2O5Calculated as K) 8.0%, potassium content (in K)2Calculated as O) 12 percent. Meanwhile, the calcium oxide powder contains 4% of available calcium oxide, 1.5% of available magnesium oxide and 3.5% of available silicon dioxide.
The product does not absorb moisture under the relative humidity of 55 percent, and reaches or exceeds the moisture absorption resistance level of the common compound fertilizer.
Example 3: a compound fertilizer containing polymorphic nitrogen, wherein the nitrogen contained in the compound fertilizer is derived from granular urea and granular nitrate nitrogen-containing fertilizers, a layer of separant containing medium trace elements is coated on the surfaces of the granules of the granular urea and the granular nitrate nitrogen-containing fertilizers under the action of a binder, a mixture of a phosphate fertilizer and a potash fertilizer is coated outside the separant through the binder, the proportion of nitrogen, phosphorus and potassium and the proportion of nitrogen fertilizers in various forms can be adjusted according to nutrient requirement rules and production requirements of different crops, and the granular urea, the granular nitrate nitrogen-containing fertilizers, the separant, the mixture of the phosphate fertilizer and the potash fertilizer are 100 parts, 43 parts and 60 parts respectively in parts by mass. The granular nitrate nitrogen-containing fertilizer is granular ammonium phosphate (32-4-0), and the binder is selected from P-containing fertilizers with mass concentration2O535 percent of phosphoric acid, the amount of the added binder is based on uniform wetting of the particle surface, and the separant containing medium and trace elements is selected from calcium magnesium phosphate fertilizer (containing 15 percent of P) crushed to pass through a test sieve of 80-120 meshes2O5) The mixture of the phosphate fertilizer and the potash fertilizer only consists of 60 parts by mass of potassium chloride, and the mixture of the phosphate fertilizer and the potash fertilizer needs to be crushed until the fineness of the mixture passes through a test sieve of 80-120 meshes.
The production steps of the compound fertilizer containing polymorphic nitrogen are as follows:
step 1), 100 parts by mass of granular urea and 43 parts by mass of granular ammonium phosphate (32-4-0) are respectively metered and added into a disc typeWrapping the granulator, spraying a binder on the surface of the fertilizer granules in a mist form, wherein the binder is prepared in advance and contains P2O5Phosphoric acid with mass concentration of 35 percent is added until the surface of the fertilizer particles is uniformly wetted, and a proper amount of calcium magnesium phosphate fertilizer (containing 15 percent of P) serving as a separant is added2O5) The calcium magnesium phosphate fertilizer is uniformly adhered to the surface of the nitrogen fertilizer particles, and the surface is dried; spraying a proper amount of adhesive to wet the surfaces of the granules, adding a proper amount of calcium magnesium phosphate fertilizer, and repeating the process until all the calcium magnesium phosphate fertilizer is added.
And 2) continuously spraying the binder to wet the surfaces of the particles, adding a proper amount of metered potassium chloride (powder is crushed to a required fineness) to wrap the potassium chloride on the surfaces of the particles, drying the particles, and repeating the process until all the potassium chloride is added. Obtaining a semi-finished product of the compound fertilizer containing polymorphic nitrogen.
And 3) conveying the wrapped fertilizer to a dryer for drying, and controlling the drying temperature to ensure that the temperature of the fertilizer is not higher than 75 ℃ and the free water in the fertilizer is dried to be lower than 2%.
And 4) conveying the dried material to a cooling machine for cooling, and cooling the temperature of the fertilizer to be below 45 ℃.
And 5) conveying the cooled fertilizer to a sieving machine, and sieving out particles with the granularity not meeting the requirement to obtain the compound fertilizer containing polymorphic nitrogen.
The composite fertilizer containing polymorphic nitrogen prepared in the embodiment comprises the following components: total nitrogen content of 20%, wherein amide nitrogen is 15.2%, ammonium nitrogen is 2.4%, nitrate nitrogen is 2.4%, and available phosphorus content (expressed as P)2O5Calculated as K) 8.0%, potassium content (in K)2Calculated as O) 12 percent. Meanwhile, the calcium oxide powder contains 4% of available calcium oxide, 1.5% of available magnesium oxide and 3.5% of available silicon dioxide.
The product does not absorb moisture under the relative humidity of 55 percent, and reaches or exceeds the moisture absorption resistance level of the common compound fertilizer.
Example 4: a composite fertilizer containing polymorphic nitrogen, the nitrogen contained in the fertilizer being derived from granular urea and granulesThe granular urea and the granular nitrate nitrogen-containing fertilizer are coated with a layer of separant containing medium and trace elements under the action of a binder, the separant is coated with a mixture of a phosphate fertilizer and a potash fertilizer, the proportion of nitrogen, phosphorus and potassium and the proportion of nitrogen fertilizers in various forms can be adjusted according to the nutrient requirement rules and production requirements of different crops, and the mixture of the granular urea, the granular nitrate nitrogen-containing fertilizer, the separant, the phosphate fertilizer and the potash fertilizer is 100 parts, 125 parts, 55 parts and 140 parts by mass respectively. The granular nitrate nitrogen-containing fertilizer is granular ammonium phosphate (32-4-0), and the binder is selected from P-containing fertilizers with mass concentration2O5The amount of 35% of phosphoric acid sludge acid added with a binder is based on uniform wetting of the particle surface, the separating agent containing medium trace elements is selected from light-burned magnesium crushed to pass through an 80-120-mesh test sieve, the mixture of the phosphate fertilizer and the potash fertilizer consists of 35 parts by mass of monoammonium phosphate and 105 parts by mass of potassium sulfate, and the mixture of the phosphate fertilizer and the potash fertilizer needs to be crushed to pass through the 80-120-mesh test sieve.
The production steps of the compound fertilizer containing polymorphic nitrogen are as follows:
step 1), respectively metering 100 parts by mass of granular urea and 125 parts by mass of granular ammonium phosphate nitrate (32-4-0), simultaneously adding the metered granular urea and the granular ammonium phosphate nitrate into a disc-type wrapping granulator, and spraying a binder onto the surfaces of the fertilizer granules in a mist form, wherein the binder is prepared in advance and contains P2O5Phosphoric acid sludge acid with mass concentration of 35% is added until the surfaces of the fertilizer particles are uniformly wetted, and a proper amount of light-burned magnesium serving as a separant is added to ensure that the light-burned magnesium is uniformly adhered to the surfaces of the nitrogen fertilizer particles and the surfaces are dried; and spraying a proper amount of binder to wet the surfaces of the particles, adding a proper amount of light-burned magnesium, and repeating the process until all 55 parts of light-burned magnesium are added.
And 2) continuously spraying a binder to wet the surfaces of the particles, adding a proper amount of metered phosphorus-potassium fertilizer consisting of 35 parts by mass of monoammonium phosphate and 105 parts by mass of potassium sulfate, crushing the phosphorus-potassium fertilizer into phosphorus-potassium fertilizer with required fineness to wrap the phosphorus-potassium fertilizer on the surfaces of the particles, drying the particles, and repeating the process until all the phosphorus-potassium fertilizer is completely added. Obtaining a semi-finished product of the compound fertilizer containing polymorphic nitrogen.
And 3) conveying the wrapped fertilizer to a dryer for drying, and controlling the drying temperature to ensure that the temperature of the fertilizer is not higher than 75 ℃ and the free water in the fertilizer is dried to be lower than 2%.
And 4) conveying the dried material to a cooling machine for cooling, and cooling the temperature of the fertilizer to be below 45 ℃.
And 5) conveying the cooled fertilizer to a sieving machine, and sieving out particles with the granularity not meeting the requirement to obtain the compound fertilizer containing polymorphic nitrogen.
The composite fertilizer containing polymorphic nitrogen prepared in the embodiment comprises the following components: total nitrogen content of 18%, wherein amide nitrogen is 9.2%, ammonium nitrogen is 4.8%, nitrate nitrogen is 4.0%, and available phosphorus content (expressed as P)2O5Calculated as K) 10%, potassium content (in K)2Calculated as O) 10 percent. Meanwhile, the magnesium oxide powder contains 5 to 6 percent of effective magnesium oxide and 3.5 percent of sulfur.
The product does not absorb moisture under the relative humidity of 55 percent, and reaches or exceeds the moisture absorption resistance level of the common compound fertilizer.
Example 5: a compound fertilizer containing polymorphic nitrogen, wherein the nitrogen contained in the compound fertilizer is derived from granular urea and granular nitrate nitrogen-containing fertilizers, a layer of separant containing medium trace elements is coated on the surfaces of the granules of the granular urea and the granular nitrate nitrogen-containing fertilizers under the action of a binder, and a mixture of a phosphate fertilizer and a potash fertilizer is coated outside the separant through the binder, the mixture can be only one of a phosphate fertilizer or a potash fertilizer, the proportion of nitrogen, phosphorus and potassium and the proportion of nitrogen fertilizers in various forms can be adjusted according to the nutrient requirement rules and production requirements of different crops, and the mixture of the granular urea, the granular nitrate nitrogen-containing fertilizers, the separant, the phosphate fertilizer and the potash fertilizer is respectively 100 parts, 25 parts, 17 parts and 90 parts by mass. The granular nitrate nitrogen-containing fertilizer is a granular nitric phosphate fertilizer, the binder is selected from sulfuric acid with the mass concentration of 40%, the amount of the added binder is based on uniform wetting of the surface of granules, the isolating agent containing medium and trace elements is selected from yellow phosphorus water-quenched slag crushed to pass through an 80-120-mesh test sieve, the mixture of the phosphate fertilizer and the potassium fertilizer is composed of 17 parts by mass of monoammonium phosphate and 73 parts by mass of potassium sulfate, and the mixture of the phosphate fertilizer and the potassium fertilizer needs to be crushed to pass through the 80-120-mesh test sieve.
The production steps of the compound fertilizer containing polymorphic nitrogen are as follows:
step 1), after 100 parts by mass of granular urea and 25 parts by mass of granular nitric phosphate fertilizer are respectively measured, adding the measured materials into a disc-type wrapping granulator, spraying a binder on the surfaces of the fertilizer granules in a mist form, wherein the binder is 40% sulfuric acid prepared in advance until the surfaces of the fertilizer granules are uniformly wetted, adding a proper amount of yellow phosphorus water-quenched slag serving as an isolating agent, uniformly adhering the yellow phosphorus water-quenched slag on the surfaces of the nitrogen fertilizer granules, and drying the surfaces; and spraying a proper amount of binder to wet the surfaces of the particles, adding a proper amount of yellow phosphorus water-quenched slag, and repeating the process until 17 parts of yellow phosphorus water-quenched slag are completely added.
And 2) continuously spraying a binder to wet the surfaces of the particles, adding a proper amount of metered phosphorus-potassium fertilizer consisting of 17 parts by mass of monoammonium phosphate and 73 parts by mass of potassium sulfate, crushing the phosphorus-potassium fertilizer into phosphorus-potassium fertilizer with required fineness to wrap the phosphorus-potassium fertilizer on the surfaces of the particles, drying the particles, and repeating the process until all the phosphorus-potassium fertilizer is completely added. Obtaining a semi-finished product of the compound fertilizer containing polymorphic nitrogen.
And 3) conveying the wrapped fertilizer to a dryer for drying, and controlling the drying temperature to ensure that the temperature of the fertilizer is not higher than 75 ℃ and the free water in the fertilizer is dried to be lower than 2%.
And 4) conveying the dried material to a cooling machine for cooling, and cooling the temperature of the fertilizer to be below 45 ℃.
And 5) conveying the cooled fertilizer to a sieving machine, and sieving out particles with the granularity not meeting the requirement to obtain the compound fertilizer containing polymorphic nitrogen.
The composite fertilizer containing polymorphic nitrogen prepared in the embodiment comprises the following components: the total nitrogen content is 22 percent, wherein the content of amide nitrogen is 18 percent, the content of ammonium nitrogen is 2.4 percent, the content of nitrate nitrogen is 1.6 percent, the content of available phosphorus is 4 percent, and the content of potassium is 14 percent. It contains 2.4% of available calcium oxide, 6% of sulfur and 2.5% of available silicon dioxide.
The product does not absorb moisture under the relative humidity of 55 percent, and reaches or exceeds the moisture absorption resistance level of the common compound fertilizer.
Example 6: a compound fertilizer containing polymorphic nitrogen, wherein the nitrogen contained in the compound fertilizer is derived from granular urea and granular nitrate nitrogen-containing fertilizers, a layer of separant containing medium trace elements is coated on the surfaces of the granules of the granular urea and the granular nitrate nitrogen-containing fertilizers under the action of a binder, and a mixture of a phosphate fertilizer and a potash fertilizer is coated outside the separant through the binder, the mixture can be only one of a phosphate fertilizer or a potash fertilizer, the proportion of nitrogen, phosphorus and potassium and the proportion of nitrogen fertilizers in various forms can be adjusted according to the nutrient requirement rules and production requirements of different crops, and the mixture of the granular urea, the granular nitrate nitrogen-containing fertilizers, the separant, the phosphate fertilizer and the potash fertilizer is respectively 100 parts, 120 parts, 35 parts and 100 parts by mass. The granular nitrate nitrogen-containing fertilizer is granular calcium ammonium nitrate, the binder is sulfuric acid with the mass concentration of 30%, the amount of the added binder is based on uniform wetting of the surface of granules, the medium-trace element-containing separant is calcined dolomite powder crushed to pass through an 80-120-mesh test sieve, the mixture of the phosphate fertilizer and the potash fertilizer only comprises one component, namely 100 parts by mass of monoammonium phosphate, and the monoammonium phosphate needs to be crushed to pass through the 80-120-mesh test sieve.
The production steps of the compound fertilizer containing polymorphic nitrogen are as follows:
step 1), respectively metering 100 parts by mass of granular urea and 120 parts by mass of granular calcium ammonium nitrate, simultaneously adding the granular urea and the granular calcium ammonium nitrate into a disc-type wrapping granulator, spraying a binder on the surfaces of the fertilizer granules in a mist form, wherein the binder is pre-prepared 30% sulfuric acid until the surfaces of the fertilizer granules are uniformly wetted, adding a proper amount of calcined dolomite powder serving as a separant, uniformly adhering the calcined dolomite powder to the surfaces of the nitrogen fertilizer granules, and drying the surfaces; spraying proper amount of adhesive to moisten the surface of the granule, adding proper amount of calcined dolomite powder, and repeating the above steps until all the calcined dolomite powder is added.
And 2) continuously spraying the binder to wet the surfaces of the particles, adding a proper amount of 100 parts by mass of monoammonium phosphate, crushing to the required fineness to wrap the monoammonium phosphate on the surfaces of the particles, drying the particles, and repeating the process until all the monoammonium phosphate is added. Obtaining a semi-finished product of the compound fertilizer containing polymorphic nitrogen.
And 3) conveying the wrapped fertilizer to a dryer for drying, and controlling the drying temperature to ensure that the temperature of the fertilizer is not higher than 75 ℃ and the free water in the fertilizer is dried to be lower than 2%.
And 4) conveying the dried material to a cooling machine for cooling, and cooling the temperature of the fertilizer to be below 45 ℃.
And 5) conveying the cooled fertilizer to a sieving machine, and sieving out particles with the granularity not meeting the requirement to obtain the compound fertilizer containing polymorphic nitrogen.
The composite fertilizer containing polymorphic nitrogen prepared in the embodiment comprises the following components: the total nitrogen content is 22.5 percent, wherein, the amide nitrogen is 11.5 percent, the ammonium nitrogen is 7 percent, the nitrate nitrogen is 4 percent, and the effective phosphorus content is 12 percent. Meanwhile, the calcium oxide powder contains 8 percent of available calcium oxide, 1.8 percent of available magnesium oxide and 1.3 percent of sulfur.
The product does not absorb moisture under the relative humidity of 55 percent, and reaches or exceeds the moisture absorption resistance level of the common compound fertilizer.
Claims (8)
1. The compound fertilizer containing polymorphic nitrogen is characterized in that nitrogen contained in the compound fertilizer is derived from granular urea and granular nitrate nitrogen-containing fertilizers, a layer of isolating agent containing medium trace elements is coated on the surfaces of granules of the granular urea and the granular nitrate nitrogen-containing fertilizers under the action of a binder, a mixture of a phosphate fertilizer and a potash fertilizer is coated outside the isolating agent through the binder, the proportion of nitrogen, phosphorus and potassium and the proportion of nitrogen fertilizers in various forms can be adjusted according to nutrient requirement rules and production requirements of different crops, and the mixture of the granular urea, the granular nitrate nitrogen-containing fertilizers, the isolating agent, the phosphate fertilizer and the potash fertilizer is 100 parts, 20-200 parts, 15-55 parts and 60-140 parts respectively in parts by mass.
2. The compound fertilizer containing polymorphic nitrogen as claimed in claim 1, wherein the granular fertilizer containing nitrate nitrogen is a granular fertilizer containing nitrate of ammonium phosphate nitrate, nitric phosphate fertilizer nitrate, calcium ammonium nitrate and potassium nitrate, or a granular fertilizer containing nitrate of a plurality of fertilizers selected from the group consisting of ammonium phosphate nitrate, nitric phosphate fertilizer nitrate, calcium ammonium nitrate and potassium nitrate in any ratio.
3. The polymorphic nitrogen-containing compound fertilizer according to claim 1, wherein the granular nitrate nitrogen-containing fertilizer is preferably selected from the group consisting of ammonium phosphate nitrate and nitrophosphate fertilizer; further preferably from ammonium phosphorus nitrate.
4. The polymorphic nitrogen-containing compound fertilizer according to claim 1, wherein the binder is selected from the group consisting of those containing P in a mass concentration2O525 to 45 percent or 30 to 42 percent or 35 to 40 percent of phosphoric acid, 20 to 40 percent of sulfuric acid with mass concentration and P2O5One or more of phosphoric acid sludge acid with mass concentration of 25-45%, 30-40% or 32-35% are mixed according to any ratio, and the amount of the added binder is based on uniform wetting of the particle surface.
5. The compound fertilizer containing polymorphic nitrogen according to claim 1, characterized in that the isolating agent containing medium trace elements is one or a mixture of more than one of calcium magnesium phosphate fertilizer, yellow phosphorus water-quenched slag, light calcined magnesia and calcined dolomite powder which are crushed to pass through a test sieve of 80-120 meshes in any ratio, preferably the calcium magnesium phosphate fertilizer or the light calcined magnesia.
6. The compound fertilizer containing polymorphic nitrogen as claimed in claim 1, characterized in that the mixture of phosphate fertilizer and potash fertilizer is selected from monoammonium phosphate or calcium magnesium phosphate fertilizer and potassium sulfate or potassium chloride, and is mixed at any ratio, and the mixture of phosphate fertilizer and potash fertilizer is crushed to a fineness passing through a test sieve of 80-120 meshes.
7. A method for producing a polymorphic nitrogen-containing compound fertilizer according to claims 1 to 6, characterized in that the production method comprises the steps of:
step 1), respectively metering a certain amount of granular urea and granular fertilizer containing nitrate nitrogen according to a formula design, adding the metered granular urea and the granular fertilizer into a coating granulator together, spraying a binder immediately, adding a release agent until the surface of the granules is uniformly wetted, adhering the release agent to the surface of the granular fertilizer and drying the surface of the granular fertilizer, and repeating the process until the release agent with the set amount is completely coated on the surface of the granular fertilizer;
step 2), continuously spraying a binder on the surface of the granular fertilizer wrapped with the separant, adding a mixture of a phosphate fertilizer and a potash fertilizer which is metered according to a formula and crushed to a fineness requirement, and repeating the process until the surface is dried until the specified amount of the mixture of the phosphate fertilizer and the potash fertilizer is completely added;
step 3), conveying the wrapped fertilizer to a dryer for drying, and controlling the drying temperature to ensure that the temperature of the fertilizer is not higher than 75 ℃ and the free water in the fertilizer is dried to be lower than 2%;
step 4), conveying the dried material to a cooling machine for cooling, and cooling the temperature of the fertilizer to be below 45 ℃;
and 5) conveying the cooled fertilizer to a sieving machine, and sieving out particles with the granularity not meeting the requirement to obtain the compound fertilizer containing polymorphic nitrogen.
8. The method for manufacturing a composite fertilizer containing polymorphic nitrogen as claimed in claim 7, wherein the coating granulator is a conventional pan granulator or a modified pan granulator; the dryer, the cooler, the screening machine and related material conveying and metering equipment thereof all adopt conventional compound fertilizer production equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010133152.4A CN111018627A (en) | 2020-03-01 | 2020-03-01 | Composite fertilizer containing polymorphic nitrogen and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010133152.4A CN111018627A (en) | 2020-03-01 | 2020-03-01 | Composite fertilizer containing polymorphic nitrogen and manufacturing method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111018627A true CN111018627A (en) | 2020-04-17 |
Family
ID=70203431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010133152.4A Pending CN111018627A (en) | 2020-03-01 | 2020-03-01 | Composite fertilizer containing polymorphic nitrogen and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111018627A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113214017A (en) * | 2021-06-08 | 2021-08-06 | 陕西华盛农资有限公司 | Method for producing fertilizer containing nitrate nitrogen by using secondary guniting process |
| CN113700088A (en) * | 2021-10-26 | 2021-11-26 | 中国农业科学院农业环境与可持续发展研究所 | Low-energy-consumption crop evapotranspiration water recycling system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103172453A (en) * | 2013-04-23 | 2013-06-26 | 济南乐喜施肥料有限公司 | Slow-release compound fertilizer and production method thereof |
| CN110590465A (en) * | 2019-10-29 | 2019-12-20 | 广西乐土生物科技有限公司 | Compound fertilizer containing nitrate nitrogen and amide nitrogen and production process thereof |
-
2020
- 2020-03-01 CN CN202010133152.4A patent/CN111018627A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103172453A (en) * | 2013-04-23 | 2013-06-26 | 济南乐喜施肥料有限公司 | Slow-release compound fertilizer and production method thereof |
| CN110590465A (en) * | 2019-10-29 | 2019-12-20 | 广西乐土生物科技有限公司 | Compound fertilizer containing nitrate nitrogen and amide nitrogen and production process thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113214017A (en) * | 2021-06-08 | 2021-08-06 | 陕西华盛农资有限公司 | Method for producing fertilizer containing nitrate nitrogen by using secondary guniting process |
| CN113700088A (en) * | 2021-10-26 | 2021-11-26 | 中国农业科学院农业环境与可持续发展研究所 | Low-energy-consumption crop evapotranspiration water recycling system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104529674B (en) | A kind of humic acid special fertilizer for sweet potato and preparation method thereof | |
| CN101177365B (en) | Long-acting special controlled release fertilizer for corn and preparation method thereof | |
| CN102811979B (en) | Ru 2006101161 comprising micronutrient element and preparation method thereof | |
| CN102850132B (en) | Preparation method of mechanically fertilized controlled-release fertilizer special for winter wheat | |
| CN101983957B (en) | Method for producing nitrogen-fixing potassium slow-release compound fertilizer with mesh inner membrane by using ammonia-acid method | |
| US11655196B2 (en) | Granules of polyhalite and urea | |
| WO2020034372A1 (en) | Medium trace element mixture and preparation method of medium trace element-wrapped fertilizer | |
| CN110590439A (en) | High-tower slow-release compound fertilizer and preparation method thereof | |
| CN102153392A (en) | Production method of novel slow release urea-formaldehyde compound fertilizer | |
| CN102320876B (en) | Tower granulation slow release long-acting nitrogen phosphorus potassium compound fertilizer and preparation method thereof | |
| CN111018627A (en) | Composite fertilizer containing polymorphic nitrogen and manufacturing method thereof | |
| CN101165012B (en) | High tower slow release composite fertilizer containing ureaformaldehyde and producing method thereof | |
| CN109704863A (en) | A kind of bulky grain sulfur-containing nitrogen fertilizer and preparation method thereof | |
| CN107986887A (en) | A kind of circle high intensity granule potassium chloride fertilizer and its manufacture method | |
| CN101172912B (en) | Control-release fertilizer special for fruit vegetable plants and method for producing the same | |
| CN101302122A (en) | Sulphur-containing diammonium phosphate fertilizer and production process thereof | |
| CN110963853A (en) | Wrapping layer, wrapping type stable fertilizer containing medium trace elements and provided with wrapping layer and preparation method of wrapping type stable fertilizer | |
| CN102898231B (en) | Big rounded-grain nitrogen potassium chlorine based binary compound fertilizer and preparation method | |
| CN1218908C (en) | Potassium chloride united pelleting process | |
| CN102001872B (en) | method for producing granular potash fertilizer and product thereof | |
| CN108358680A (en) | The micro- anti-dusting type phosphate fertilizer coating method of moisture-proof anti-caking in a kind of addition | |
| CN107586189A (en) | A kind of preparation method of the special damp-proof urea of Blending Fertilizer | |
| CN1083815C (en) | Method for prodcing high effective ureido compound fertilizer | |
| CN107176894A (en) | A kind of high nitrogen long-acting compound fertilizer and preparation method thereof | |
| CN116283425B (en) | Silicate slow-release fertilizer and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200417 |