阅读说明：本技术 一种复合肥中微量元素的配制方法 (Method for preparing trace elements in compound fertilizer ) 是由 韦利斌 刘娟 于 2020-12-23 设计创作，主要内容包括：本发明涉及复合肥技术领域,具体涉及一种复合肥中微量元素的配制方法,包括基肥调质、复合添加、喷浆造粒和冻干封装；其中使用的喷浆设备包括喷浆筒、喷浆管、筛膜和控制器；由于复合肥在造粒过程中进行各种成分混合的水基载体,需要控制其在螯合物中的脱离速率,匹配螯合后混合肥料的成粒过程,否则会影响到复合肥中微量元素在施用后的功效时间；故此,本发明通过设置在喷浆筒中的回流口,将造粒过程中蒸发的水汽流通至喷浆筒下方的配料罐中,达到了水基载体的循环利用,进而降低了喷浆造消耗的水基载体量,并维持了复合肥造粒过程中液态肥料水分的配比量,稳定了造粒的成型质量,从而提升了复合肥中微量元素配制方法的应用效果。(The invention relates to the technical field of compound fertilizers, in particular to a method for preparing trace elements in a compound fertilizer, which comprises the steps of modifying and tempering a base fertilizer, adding in a compounding manner, spraying slurry for granulation and freeze-drying and packaging; the used guniting equipment comprises a guniting cylinder, a guniting pipe, a screen membrane and a controller; because the compound fertilizer is subjected to the water-based carrier mixed with various components in the granulation process, the separation rate of the compound fertilizer in the chelate needs to be controlled, and the granulation process of the chelated mixed fertilizer is matched, otherwise, the efficacy time of the trace elements in the compound fertilizer after application is influenced; therefore, the invention uses the reflux opening arranged in the guniting cylinder to lead the steam evaporated in the granulation process to flow into the batching tank below the guniting cylinder, thereby achieving the recycling of the water-based carrier, further reducing the water-based carrier amount consumed by guniting, maintaining the water ratio of the liquid fertilizer in the granulation process of the compound fertilizer, stabilizing the molding quality of the granulation, and improving the application effect of the preparation method of the trace elements in the compound fertilizer.)

1. A method for preparing trace elements in a compound fertilizer is characterized by comprising the following steps: the method comprises the following steps:

s1, hardening and tempering of base fertilizer: selecting a compound amino acid raw material as a base fertilizer material of the compound fertilizer, cleaning the compound amino acid raw material by deionized water, regulating the pH value to 6.2-6.7, and then preserving heat by adopting the temperature of 55-65 ℃;

s2, composite addition: adding trace element inorganic salt to be added into the quenched and tempered base fertilizer solution in S1, stirring for 90-140min at 25-32 ℃ to fully chelate amino acid and trace elements in the base fertilizer, and adding the base fertilizer into a mixing tank (4) of a spraying device;

s3, spraying and granulating: starting a guniting pipe (2) in guniting equipment, pumping the compound fertilizer solution in a batching tank (4) into a guniting cylinder (1), adjusting the heat radiation temperature of a heating lamp (12) to 70-85 ℃, controlling the rotating speed of a rotary leaf membrane (6) in the guniting cylinder (1) to be 30-45r/min, and drying and forming fertilizer droplets suspended in the guniting cylinder (1) by the heating lamp (12) under the condition that the guniting pipe (2) is in an intermittent operation state of 10-15min to obtain compound fertilizer solid particles;

s4, freeze-drying and packaging: filling the compound fertilizer solid granules prepared in the S3 into a low-temperature tank, keeping the compound fertilizer solid granules at the temperature of between 6 ℃ below zero and 2 ℃ below zero for 20min for freeze-drying, and then subpackaging:

the guniting equipment described in S2-S3 comprises a guniting cylinder (1), a guniting pipe (2), a screening membrane (3) and a controller; the spraying cylinder (1) is vertically installed, a spraying pipe (2) is arranged at the bottom of the spraying cylinder (1), and the spraying pipe (2) pumps the liquid base fertilizer into the spraying cylinder (1); the bottom of the guniting barrel (1) is also provided with a lifting frame (11), and the guniting pipe (2) is fixedly arranged in the lifting frame (11); the top of the guniting cylinder (1) is provided with an annular heating lamp (12), the center of the annular heating lamp (12) of the guniting cylinder (1) is also provided with a backflow port (13), a batching tank (4) is also arranged below the guniting cylinder (1), and the batching tank (4) is connected with the bottom of the guniting pipe (2); a pipeline (41) communicated with the material mixing tank (4) is also arranged between the return port (13); the inner part of the slurry spraying barrel (1) is also provided with a screen membrane (3), the screen membrane (3) is parallel to the end surface of the slurry spraying barrel (1), and the screen membrane (3) is used for atomizing liquid drops pumped out of the slurry spraying pipe (2); the center of the sieve membrane (3) is raised, the circumferential slurry spraying cylinder (1) of the sieve membrane (3) is also provided with a particle collecting groove (5), and the particle collecting groove (5) penetrates through the outer part of the slurry spraying cylinder (1) and is provided with a material collecting pipe (51); the controller is used for adjusting the operation of the guniting equipment.

2. The method for preparing the trace elements in the compound fertilizer as claimed in claim 1, wherein the method comprises the following steps: a rotary leaf membrane (6) is also arranged between the sieve membrane (3) and the heating lamp (12), the rotary leaf membrane (6) is in a spiral impeller structure, and the top of the rotary leaf membrane (6) is rotatably arranged on the slurry spraying barrel (1); the top end of the pulp spraying cylinder (1) is provided with a driving rotary motor (14), and the rotary motor (14) enables the rotary blade membrane (6) to be in a rotating state.

3. The method for preparing the trace elements in the compound fertilizer as claimed in claim 2, wherein the method comprises the following steps: the rotary leaf membrane (6) is also provided with grooves (61), the grooves (61) are distributed along the rotary track of the rotary leaf membrane (6), and the grooves (61) are used for guiding fertilizer solid particles falling on the rotary leaf membrane (6); and a metal sheet is further laid in the groove (61), and intermittent raised particles (62) are arranged on the surface of the metal sheet.

4. The method for preparing the trace elements in the compound fertilizer as claimed in claim 3, wherein the method comprises the following steps: the surface of the metal sheet is also provided with decelerating ridges (63), and the decelerating ridges (63) are positioned at the bottoms of the intermittent raised particles (62); the surface of the rotary vane membrane (6) is also provided with herringbone convex strips (64), and the inclined bottoms of the convex strips (64) are intersected in the grooves (61).

5. The method for preparing the trace elements in the compound fertilizer as claimed in claim 1, wherein the method comprises the following steps: an arc-shaped basin (15) is further arranged at the bottom of the slurry spraying barrel (1), and a gap is reserved between the edge of the arc-shaped basin (15) and the inner wall of the slurry spraying barrel (1); the spraying cylinder (1) and the arc basin (15) are also provided with a through hole (16), the through hole (16) is larger than the outer diameter of the spraying pipe (2), and the spraying cylinder (1) is communicated with the proportioning tank (4) through the through hole (16).

6. The method for preparing the trace elements in the compound fertilizer as claimed in claim 1, wherein the method comprises the following steps: the bottom of the particle collecting groove (5) facing the slurry spraying cylinder (1) is provided with a corrugated undulating surface (52), and a net surface (53) is also arranged on the valley region of the undulating surface (52).

Technical Field

The invention relates to the technical field of compound fertilizers, in particular to a preparation method of trace elements in a compound fertilizer.

Background

The compound fertilizer is a chemical fertilizer containing two or more nutrient elements, has the advantages of high nutrient content, few side ingredients, good physical properties and the like, and has important effects on balanced fertilization, improvement of the utilization rate of the fertilizer and promotion of high and stable yield of crops; in order to improve the crop yield, the soil is applied with fertilizer with too high concentration, so that the lack of medium and trace elements in the soil reduces the fertility of the soil and weakens the effect of continuously applying the fertilizer, and the lack of the medium and trace elements also influences the production quality of crops.

The addition of the trace elements in the compound fertilizer is realized by chelating and granulating the components of the required trace elements with the base fertilizer of the compound fertilizer, and the water-based carrier mixed with various components is carried out in the granulating process, so that the separation rate of the water-based carrier in the chelate needs to be controlled, the granulating process of the chelated mixed fertilizer is matched, and the efficacy time of the trace elements in the compound fertilizer after application is influenced.

The prior art also discloses some technical schemes related to a preparation method of trace elements in a compound fertilizer, for example, a Chinese patent with application number 2010105110226 discloses a preparation method of a nitro-compound fertilizer, which comprises a dechlorination process, an acid mixing process, a neutralization process, a chelation process and a granulation and drying process, wherein the chelation process comprises the steps of adding a trace element compound and a chelating agent into a reaction kettle for chelation to obtain a chelate, adding the chelate and 30-40% ammonium nitrate into a mixer for uniform mixing to obtain a mixture, wrapping ions of the trace elements by the chelating agent through a chelation process to obtain the chelate, preventing antagonistic reaction between the ions of the trace elements in the chelate and other ions to generate a non-water-soluble substance which is not easy to be absorbed by crops, the technical scheme adds the trace elements into the compound fertilizer, coordinates the synergistic effect of various nutrient elements, the growth requirement of crops is met, and the conversion and utilization rate of chemical fertilizer in soil are improved, so that the yield of the crops is improved, and the cost of fertilizer is saved; however, the technical scheme does not solve the problem that the water content of the compound fertilizer is controlled to be separated in the granulation and forming process, so that the effect of trace elements in the prepared compound fertilizer in application is influenced.

In view of the above, in order to overcome the above technical problems, the present invention provides a method for preparing trace elements in a compound fertilizer, which adopts a special method for preparing trace elements in a compound fertilizer, thereby solving the above technical problems.

Disclosure of Invention

In order to make up for the defects of the prior art, the invention provides a preparation method of trace elements in a compound fertilizer, which is characterized in that water vapor evaporated in the granulation process is circulated to a proportioning tank below a spraying cylinder through a backflow port arranged in the spraying cylinder, so that the recycling of a water-based carrier is achieved, the water-based carrier amount consumed by spraying is further reduced, the proportion of water in a liquid fertilizer in the granulation process of the compound fertilizer is maintained, the granulation forming quality is stabilized, and the application effect of the preparation method of the trace elements in the compound fertilizer is improved.

The invention relates to a method for preparing trace elements in a compound fertilizer, which comprises the following steps:

s1, hardening and tempering of base fertilizer: selecting a compound amino acid raw material as a base fertilizer material of the compound fertilizer, cleaning the compound amino acid raw material by deionized water, regulating the pH value to 6.2-6.7, and then preserving heat by adopting the temperature of 55-65 ℃; the base fertilizer material is tempered to be in a faintly acid state, so that the chelating rate between the base fertilizer and trace elements in the subsequent process is promoted;

s2, composite addition: adding trace element inorganic salt to be added into the quenched and tempered base fertilizer solution in S1, stirring for 90-140min at 25-32 ℃ to fully chelate amino acid and trace elements in the base fertilizer, and adding the base fertilizer into a mixing tank of a spraying device;

s3, spraying and granulating: starting a guniting pipe in guniting equipment, pumping the compound fertilizer solution in a batching tank into a guniting cylinder, adjusting the heat radiation temperature of a heating lamp to 70-85 ℃, controlling the rotating speed of a rotary leaf membrane in the guniting cylinder to be 30-45r/min, and drying and forming fertilizer droplets suspended in the guniting cylinder by the heating lamp under the intermittent operation state of 10-15min to obtain compound fertilizer solid particles;

s4, freeze-drying and packaging: filling the compound fertilizer solid granules prepared in the S3 into a low-temperature tank, keeping the compound fertilizer solid granules at the temperature of between 6 ℃ below zero and 2 ℃ below zero for 20min for freeze-drying, and then subpackaging; the water contained in the compound fertilizer solid particles is condensed through freeze-drying and packaging, so that the looseness of the compound fertilizer solid particle structure is increased, and the compound fertilizer solid particles are conveniently dissolved in the application process:

the slurry spraying equipment described in S2-S3 comprises a slurry spraying barrel, a slurry spraying pipe, a screen membrane and a controller; the spraying cylinder is vertically installed, a spraying pipe is arranged at the bottom of the spraying cylinder, and the spraying pipe pumps the liquid base fertilizer into the spraying cylinder; the bottom of the guniting barrel is also provided with a lifting frame, and a guniting pipe is fixedly arranged in the lifting frame; the top of the guniting cylinder is provided with an annular heating lamp, the guniting cylinder is also provided with a backflow port at the center of the annular heating lamp, and a batching tank is also arranged below the guniting cylinder and is connected with the bottom of the guniting pipe; a pipeline communicated with the return port and the batching tank is also arranged between the return port and the batching tank; the inner part of the guniting cylinder is also provided with a screening film, the screening film is parallel to the end face of the guniting cylinder, and the screening film is used for atomizing liquid drops pumped out of the guniting pipe; the center of the sieve membrane is raised, the slurry spraying cylinder in the circumferential direction of the sieve membrane is also provided with a particle collecting groove, and the particle collecting groove penetrates through the outer part of the slurry spraying cylinder and is provided with a material collecting pipe; the controller is used for adjusting the operation of the guniting equipment;

in the prior art, the addition of trace elements in the compound fertilizer is realized by chelating and granulating components of the required trace elements and a base fertilizer of the compound fertilizer, and a water-based carrier with various mixed components is carried out in the granulating process, so that the separation rate of the water-based carrier in a chelate needs to be controlled, the granulating process of the chelated mixed fertilizer is matched, and the effect time of the trace elements in the compound fertilizer after application is prevented from being influenced;

therefore, the invention adjusts the height between the lifting frames through the controller by the guniting pipe arranged on the bottom lifting frame of the guniting cylinder according to the specific gravity of the added elements in the compound fertilizer, so that each liquid fertilizer to be mixed in the guniting pipe enters the guniting cylinder at different initial heights, and then the distance difference between different guniting pipes and the screen membrane is caused, the pumped liquid fertilizer penetrates through the screen membrane at different initial speeds, liquid fog drops with a layered structure are formed on the upper part of the guniting cylinder, and the fertilizer drops on the top of the guniting cylinder gradually form solid particles under the evaporation action of the heating lamp and contact with suspended liquid drops below in the descending process of the granulation to form a wrapping layer on the surface of the particles, so that the multilayer structure of the compound fertilizer particles is achieved, finally the compound fertilizer drops fall on the surface of the screen membrane and roll into the particle collecting groove in the circumferential direction of the screen membrane, and the compound fertilizer is collected through the particle collecting pipe, simultaneously, water vapor evaporated by the heating lamp enters the pipeline along the return port and is mixed with the added fertilizer in the proportioning tank, so that the moisture content of the liquid fertilizer pumped out of the guniting pipe is maintained; the invention utilizes the backflow port arranged in the spraying cylinder to lead the steam evaporated in the granulation process to the batching tank below the spraying cylinder, thereby achieving the recycling of the water-based carrier, further reducing the water-based carrier consumption in the spraying process, maintaining the proportion of the water in the liquid fertilizer in the granulation process of the compound fertilizer, stabilizing the molding quality of the granulation and further improving the application effect of the preparation method of the trace elements in the compound fertilizer.

Preferably, a rotary leaf membrane is arranged between the sieve membrane and the heating lamp, the rotary leaf membrane is in a spiral impeller structure, and the top of the rotary leaf membrane is rotatably arranged on the slurry spraying barrel; the top end of the slurry spraying cylinder is provided with a driving rotary motor, and the rotary motor enables the rotary blade membrane to be in a rotating state; when in use, the liquid fertilizer pumped out of the guniting pipe is atomized by the sieve membrane; through the arranged rotary leaf membrane, suspended atomized liquid drops enter the rotary leaf membrane, and are lifted to the upper part of the rotary leaf membrane along with the rotation of the rotary leaf membrane, so that water in the atomized liquid drops is evaporated under the irradiation of the heating lamp, the formed solid particles roll down along the surface of the rotary leaf membrane under the action of gravity, the interference of the formed solid particles on the upper part of the guniting cylinder on the subsequent ascending atomized liquid drops in the descending process is avoided, the single evaporation granulation amount of the atomized liquid drops is balanced by the arranged rotary leaf membrane, the evaporation effect of the heating lamp on the atomized liquid drops on the lower layer is isolated, the successive fusion process among different-component liquid fertilizers in granulation is ensured, and the application effect of the trace element preparation method in the granulation is improved.

Preferably, the rotary leaf membrane is also provided with grooves, the grooves are distributed along the rotation direction track of the rotary leaf membrane, and the grooves are used for guiding fertilizer solid particles falling off from the rotary leaf membrane; a metal sheet is also laid in the groove, and intermittent raised particles are arranged on the surface of the metal sheet; when the fertilizer solid particle drying device is used, atomized liquid drops above the rotary leaf membrane are solidified and formed under the evaporation effect of the heating lamp and then fall along the groove formed in the rotary leaf membrane, so that the situation that the fertilizer solid particles collide with the rotary leaf membrane in the falling process to damage the structure of the fertilizer solid particles is avoided, the metal sheet arranged in the groove can conduct heat radiated by the heating lamp, the fertilizer solid particles rolling in the groove are further insulated, the surface of the fertilizer solid particles is prevented from contacting the atomized liquid drops lifted in the rotary leaf membrane in the falling process, the dryness of the fertilizer solid particles is maintained, and the particles protruding on the surface of the metal sheet reduce the contact area between the fertilizer solid particles and the groove, the falling state of the fertilizer solid particles is favorably maintained, and the using process of the trace element preparation method in the compound fertilizer is stabilized.

Preferably, the surface of the metal sheet is also provided with a decelerating ridge, and the decelerating ridge is positioned at the bottom of the intermittently raised particles; the surface of the rotary leaf membrane is also provided with a herringbone convex strip, and the inclined bottom of the convex strip is intersected in the groove; when the fertilizer is used, the speed of the fertilizer solid particles in the rolling process is gradually increased, the fertilizer solid particles in the rolling process are controlled through the arranged decelerating ridges, the fertilizer solid particles are prevented from violently colliding a slurry spraying cylinder after being separated from a rotating leaf membrane and entering a screen membrane, atomized liquid drops can be attached to the surface of the rotating leaf membrane in the operation process and are gradually condensed to form liquid drops to roll down, the arranged herringbone inclined raised strips guide the liquid drops rolled and gathered into the grooves to be contacted and absorbed by the fertilizer solid particles rolling in the grooves, the liquid drops gathered in the grooves are prevented from dropping onto the screen membrane below, the rising path of the liquid drops pumped out from the slurry spraying pipe is blocked, and the use process of the preparation method of trace elements in the compound fertilizer is stabilized.

Preferably, the bottom of the slurry spraying barrel is also provided with an arc-shaped basin, and a gap is reserved between the edge of the arc-shaped basin and the inner wall of the slurry spraying barrel; through holes are also formed in the guniting cylinder and the arc-shaped basin, the through holes are larger than the outer diameter of the guniting pipe, and the guniting cylinder is communicated with the batching tank through the through holes; during the use, the steam that gets into the pipeline from the backward flow mouth, after condensing for liquid gets into batching jar, produce pressure differential in the department of through-hole when wherein thoughtlessly having gas along with the whitewashing pipe pump out liquid fertilizer, bring the gas in the batching jar into the whitewashing section of thick bamboo, and then cooperation whitewashing section of thick bamboo top backward flow mouth and pipeline have accomplished gaseous circulation and have circulated, and then promoted the circulation effect of wherein steam, the space between the arc basin that sets up and the whitewashing section of thick bamboo inner wall simultaneously, make the gaseous current of circulation flow in the inner wall region of whitewashing section of thick bamboo flow, prevent to disturb the suspended state of the atomized liquid drop in the whitewashing section of thick bamboo, and avoided the atomized liquid drop to adhere to on the inner wall of whitewashing section of thick bamboo, thereby the use of microelement preparation method in the compound fertilizer has been stabilized.

Preferably, the bottom of the particle collecting groove facing the slurry spraying cylinder is provided with a corrugated undulating surface, and a low valley region of the undulating surface is also provided with a net surface; when the device is used, the fertilizer solid particles falling into the sieve membrane circumferential particle collecting groove from the rotary leaf membrane are adhered to atomized liquid drops in the sieve membrane area on the surface of the fertilizer solid particles, fall into the valley area of the undulating surface through the undulating surface arranged at the bottom of the particle collecting groove, are matched with the net surface arranged in the valley area, are blown by utilizing ascending air flow at the bottom of the guniting cylinder, air-dry the atomized liquid drops on the surface of the fertilizer solid particles, and move the fertilizer solid particles in the particle collecting groove to enter the material collecting pipe to be discharged, so that the application effect of the trace element preparation method in the compound fertilizer is improved.

The invention has the following beneficial effects:

1. according to the invention, through the backflow port arranged in the spraying cylinder, steam evaporated in the granulation process flows into the batching tank below the spraying cylinder, so that the recycling of the water-based carrier is achieved, the water-based carrier consumption in the spraying process is further reduced, the proportion of the water content of the liquid fertilizer in the granulation process of the compound fertilizer is maintained, and the granulation molding quality is stabilized.

2. According to the invention, the suspended atomized liquid drops are lifted to the upper part of the rotary leaf membrane along with the rotation of the rotary leaf membrane through the arranged rotary leaf membrane, so that the water in the atomized liquid drops is evaporated under the irradiation of a heating lamp, the formed solid particles roll down along the grooves on the surface of the rotary leaf membrane under the action of gravity, and the roll-down is converged in the liquid bead guide grooves of the rotary leaf membrane through the arranged herringbone convex strips, so that the successive fusion process among liquid fertilizers with different components during granulation is ensured.

3. According to the invention, after steam entering the pipeline from the return port is condensed into liquid and enters the proportioning tank, the mixed gas generates pressure difference at the through port when the liquid fertilizer is pumped out along with the guniting pipe, the gas in the proportioning tank is brought into the guniting barrel, the circulation of the gas is completed by matching the return port at the top of the guniting barrel and the pipeline, the mesh surface is arranged in a valley area, and fertilizer solid particles in a relief surface at the bottom of the particle collecting groove are blown by utilizing ascending air flow at the bottom of the guniting barrel, so that atomized liquid drops on the surface of the fertilizer solid particles are air-dried.

Drawings

The invention is further described with reference to the following figures and embodiments.

FIG. 1 is a flow chart of a method for preparing trace elements in a compound fertilizer according to the invention;

FIG. 2 is a perspective view of a guniting barrel assembly according to the present invention;

FIG. 3 is a cross-sectional view of a guniting barrel assembly according to the invention;

FIG. 4 is an enlarged view of a portion of FIG. 2 at A;

FIG. 5 is an enlarged view of a portion of FIG. 2 at B;

in the figure: the device comprises a guniting cylinder 1, a lifting frame 11, a heating lamp 12, a return port 13, a rotary motor 14, an arc-shaped basin 15, a through port 16, a guniting pipe 2, a screening membrane 3, a batching tank 4, a pipeline 41, a grain collecting groove 5, a grain collecting pipe 51, a bending surface 52, a net surface 53, a rotary leaf membrane 6, a groove 61, particles 62, a decelerating ridge 63 and a convex strip 64.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1 to 5, the method for preparing trace elements in a compound fertilizer comprises the following steps:

s1, hardening and tempering of base fertilizer: selecting a compound amino acid raw material as a base fertilizer material of the compound fertilizer, cleaning the compound amino acid raw material by deionized water, regulating the pH value to 6.2-6.7, and then preserving heat by adopting the temperature of 55-65 ℃; the base fertilizer material is tempered to be in a faintly acid state, so that the chelating rate between the base fertilizer and trace elements in the subsequent process is promoted;

s2, composite addition: adding trace element inorganic salt to be added into the quenched and tempered base fertilizer solution in S1, stirring for 90-140min at 25-32 ℃ to fully chelate amino acid and trace elements in the base fertilizer, and adding the base fertilizer into a mixing tank 4 of a guniting device;

s3, spraying and granulating: starting a guniting pipe 2 in guniting equipment, pumping the compound fertilizer solution in a batching tank 4 into a guniting cylinder 1, adjusting the heat radiation temperature of a heating lamp 12 to 70-85 ℃, controlling the rotating speed of a rotary leaf membrane 6 in the guniting cylinder 1 to be 30-45r/min, and drying and forming fertilizer drops suspended in the guniting cylinder 1 with the heating lamp 12 under the intermittent operation state of 10-15min to obtain compound fertilizer solid particles;

s4, freeze-drying and packaging: filling the compound fertilizer solid granules prepared in the S3 into a low-temperature tank, keeping the compound fertilizer solid granules at the temperature of between 6 ℃ below zero and 2 ℃ below zero for 20min for freeze-drying, and then subpackaging; the water contained in the compound fertilizer solid particles is condensed through freeze-drying and packaging, so that the looseness of the compound fertilizer solid particle structure is increased, and the compound fertilizer solid particles are conveniently dissolved in the application process:

the guniting equipment described in S2-S3 comprises a guniting cylinder 1, a guniting pipe 2, a screening membrane 3 and a controller; the spraying cylinder 1 is vertically installed, the spraying pipe 2 is arranged at the bottom of the spraying cylinder 1, and the spraying pipe 2 pumps the liquid base fertilizer into the spraying cylinder 1; the bottom of the guniting barrel 1 is also provided with a lifting frame 11, and the guniting pipe 2 is fixedly arranged in the lifting frame 11; the top of the slurry spraying cylinder 1 is provided with an annular heating lamp 12, the center of the annular heating lamp 12 of the slurry spraying cylinder 1 is also provided with a backflow port 13, a batching tank 4 is also arranged below the slurry spraying cylinder 1, and the batching tank 4 is connected with the bottom of the slurry spraying pipe 2; a pipeline 41 communicated with the material mixing tank 4 is also arranged between the return port 13 and the material mixing tank; the inner part of the guniting cylinder 1 is also provided with a screening membrane 3, the screening membrane 3 is parallel to the end face of the guniting cylinder 1, and the screening membrane 3 is used for atomizing liquid drops pumped out of the guniting pipe 2; the center of the sieve membrane 3 is raised, the spray cylinder 1 at the periphery of the sieve membrane 3 is also provided with a particle collecting groove 5, and a material collecting pipe 51 is arranged outside the particle collecting groove 5 which penetrates through the spray cylinder 1; the controller is used for adjusting the operation of the guniting equipment;

in the prior art, the addition of trace elements in the compound fertilizer is realized by chelating and granulating components of the required trace elements and a base fertilizer of the compound fertilizer, and a water-based carrier with various mixed components is carried out in the granulating process, so that the separation rate of the water-based carrier in a chelate needs to be controlled, the granulating process of the chelated mixed fertilizer is matched, and the effect time of the trace elements in the compound fertilizer after application is prevented from being influenced;

therefore, the invention adjusts the height between the lifting frames 11 through the slurry spraying pipe 2 arranged on the lifting frame 11 at the bottom of the slurry spraying cylinder 1 by the controller according to the specific gravity of the added elements in the compound fertilizer, so that each liquid fertilizer to be mixed in the slurry spraying pipe 2 enters the slurry spraying cylinder 1 at different initial heights, further causes the distance difference between different slurry spraying pipes 2 and the screen membrane 3, ensures that the pumped liquid fertilizer penetrates through the screen membrane 3 at different initial speeds, forms liquid fog drops with a layered structure at the upper part of the slurry spraying cylinder 1, further leads the fertilizer liquid drops at the top of the slurry spraying cylinder 1 to gradually form solid particles under the evaporation action of the heating lamp 12, and contacts with the liquid drops suspended below in the descending process of the particles to form a wrapping layer on the surfaces of the particles, further reaches the multilayer structure of the compound fertilizer particles, finally falls on the surfaces of the screen membrane 3 and rolls into the particle collecting groove 5 in the circumferential direction, the compound fertilizer is collected through the material collecting pipe 51, and simultaneously the water vapor evaporated by the heating lamp 12 enters the pipeline 41 along the return port 13 and is mixed with the added fertilizer in the proportioning tank 4 to maintain the moisture content of the liquid fertilizer pumped out from the guniting pipe 2; the invention utilizes the return port 13 arranged in the guniting cylinder 1 to lead the steam evaporated in the granulation process to flow into the proportioning tank 4 below the guniting cylinder 1, thereby achieving the recycling of the water-based carrier, further reducing the water-based carrier amount consumed by guniting, maintaining the proportion of the water in the liquid fertilizer in the granulation process of the compound fertilizer, stabilizing the molding quality of granulation and further improving the application effect of the trace element preparation method in the compound fertilizer.

As an embodiment of the invention, a rotary vane membrane 6 is further arranged between the sieve membrane 3 and the heating lamp 12, the rotary vane membrane 6 is in a spiral impeller structure, and the top of the rotary vane membrane 6 is rotatably mounted on the slurry spraying barrel 1; the top end of the slurry spraying cylinder 1 is provided with a driven rotary motor 14, and the rotary motor 14 enables the rotary blade membrane 6 to be in a rotating state; when in use, the liquid fertilizer pumped out of the guniting pipe 2 is atomized by the sieve membrane 3; through the arranged rotary leaf membrane 6, suspended atomized liquid drops enter the rotary leaf membrane 6 and are lifted to the upper part of the rotary leaf membrane 6 along with the rotation of the rotary leaf membrane 6, and then water in the suspended atomized liquid drops is evaporated under the irradiation of the heating lamp 12, so that formed solid particles roll down along the surface of the rotary leaf membrane 6 under the action of gravity, the interference of the formed solid particles on the upper part of the guniting cylinder 1 on the descending process to the subsequently ascending atomized liquid drops is avoided, the single evaporation granulation amount of the atomized liquid drops is balanced by the arranged rotary leaf membrane 6, the evaporation effect of the heating lamp 12 on the atomized liquid drops on the lower layer is isolated, the successive fusion process of different liquid fertilizers during granulation is ensured, and the application effect of the trace element preparation method in the compound fertilizer is improved.

As an embodiment of the present invention, the rotating vane membrane 6 is further provided with a groove 61, the groove 61 is distributed along the rotation direction track of the rotating vane membrane 6, and the groove 61 is used for guiding the fertilizer solid particles rolled off the rotating vane membrane 6; a metal sheet is further laid in the groove 61, and intermittent raised particles 62 are arranged on the surface of the metal sheet; when the fertilizer solid particle drying device is used, atomized liquid drops above the rotary leaf membrane 6 are solidified and formed under the evaporation effect of the heating lamp 12 and then fall along the groove 61 formed in the rotary leaf membrane 6, so that the situation that the fertilizer solid particles collide in the falling process of the rotary leaf membrane 6 to damage the structure of the fertilizer solid particles is avoided, the metal sheet arranged in the groove 61 can conduct heat radiated by the heating lamp 12, the heat of the fertilizer solid particles rolling in the groove 61 is further preserved, the surface of the fertilizer solid particles is prevented from contacting the atomized liquid drops lifted in the rotary leaf membrane 6 in the falling process, the dryness of the fertilizer solid particles is maintained, the particles 62 protruding on the surface of the metal sheet reduce the contact area between the fertilizer solid particles and the groove 61, the falling state of the fertilizer solid particles is favorably kept, and the using process of the trace element preparation method in compound fertilizers is stabilized.

As an embodiment of the present invention, the surface of the metal sheet is further provided with decelerating ridges 63, and the decelerating ridges 63 are located at the bottoms of the intermittently raised particles 62; the surface of the rotary vane membrane 6 is also provided with a herringbone convex strip 64, and the inclined bottom of the convex strip 64 is intersected in the groove 61; when the fertilizer is used, the speed of the fertilizer solid particles in the rolling process is gradually increased, the fertilizer solid particles in the rolling process are controlled through the arranged deceleration ridges 63, so that the fertilizer solid particles are prevented from violently colliding with the slurry spraying barrel 1 after being separated from the rotary leaf membrane 6 and entering the screen membrane 3, atomized liquid drops can be attached to the surface of the rotary leaf membrane 6 in the running process and are gradually condensed to form liquid drops to roll down, the arranged herringbone inclined raised strips 64 guide the liquid drops rolled and gathered into the grooves 61 to be contacted and absorbed by the fertilizer solid particles rolling therein, the liquid drops gathered in the grooves 61 are prevented from dropping onto the screen membrane 3 below, the rising path of the liquid drops pumped out of the slurry spraying pipe 2 is blocked, and the using process of the trace element preparation method in the compound fertilizer is stabilized.

As an embodiment of the invention, the bottom of the guniting cylinder 1 is further provided with an arc-shaped basin 15, and a gap is reserved between the edge of the arc-shaped basin 15 and the inner wall of the guniting cylinder 1; the slurry spraying cylinder 1 and the arc basin 15 are also provided with a through hole 16, the through hole 16 is larger than the outer diameter of the slurry spraying pipe 2, and the through hole 16 enables the slurry spraying cylinder 1 to be communicated with the batching tank 4; when the device is used, steam entering the pipeline 41 from the return port 13 is condensed into liquid and enters the proportioning tank 4, pressure difference is generated at the through port 16 when mixed gas pumps liquid fertilizer along with the guniting pipe 2, the gas in the proportioning tank 4 is brought into the guniting barrel 1, and then the return port 13 at the top of the guniting barrel 1 and the pipeline 41 are matched to complete circulating circulation of the gas, so that the circulation effect of the steam is promoted, and meanwhile, a gap between the arc-shaped basin 15 and the inner wall of the guniting barrel 1 is formed, so that circulating airflow flows in the inner wall area of the guniting barrel 1, the suspension state of atomized liquid drops in the guniting barrel 1 is prevented from being interfered, the atomized liquid drops are prevented from being attached to the inner wall of the guniting barrel 1, and the use process of a trace element preparation method in a compound fertilizer is stabilized.

In one embodiment of the present invention, the particle collecting groove 5 is provided with a corrugated undulating surface 52 facing the bottom of the slurry barrel 1, and a net surface 53 is further provided on a valley region of the undulating surface 52; when the fertilizer collector is used, fertilizer solid particles falling into the particle collecting groove 5 in the circumferential direction of the screen membrane 3 from the rotary leaf membrane 6 are adhered to atomized liquid drops in the area of the screen membrane 3 on the surface of the fertilizer solid particles, fall into a valley area of the undulating surface 52 through the undulating surface 52 arranged at the bottom of the particle collecting groove 5, are blown by utilizing ascending air flow at the bottom of the spraying cylinder 1 in cooperation with the net surface 53 arranged in the valley area, air-dry the atomized liquid drops on the surface of the fertilizer solid particles, and move the fertilizer solid particles in the particle collecting groove 5 to enter the material collecting pipe 51 to be discharged, so that the application effect of the preparation method of trace elements in compound fertilizers is improved.

When in use, the height between the lifting frames 11 is adjusted by the controller through the guniting pipe 2 arranged on the lifting frame 11 at the bottom of the guniting cylinder 1 according to the specific gravity of the added elements in the compound fertilizer, so that each liquid fertilizer to be mixed in the guniting pipe 2 enters the guniting cylinder 1 at different initial heights, then the distance difference between different guniting pipes 2 and the screen membrane 3 is caused, the pumped liquid fertilizer penetrates through the screen membrane 3 at different initial speeds, liquid fog drops with a layered structure are formed at the upper part of the guniting cylinder 1, then the fertilizer liquid drops at the top of the guniting cylinder 1 gradually form solid particles under the evaporation action of the heating lamp 12, and contact with liquid drops suspended below in the descending process of the particles to form a wrapping layer on the surface of the particles so as to achieve the multilayer structure of the compound fertilizer particles, finally fall on the surface of the screen membrane 3 and roll into the circumferential particle collecting groove 5 of the screen membrane, and the compound fertilizer is collected through the material collecting pipe 51, simultaneously, the steam evaporated by the heating lamp 12 enters the pipeline 41 along the return port 13 and is mixed with the added fertilizer in the proportioning tank 4 to maintain the moisture content of the liquid fertilizer pumped out from the guniting pipe 2; the arranged rotary leaf membrane 6 enables suspended atomized liquid drops to enter the rotary leaf membrane 6 and be lifted above the rotary leaf membrane 6 along with the rotation of the rotary leaf membrane 6, and then water in the atomized liquid drops is evaporated under the irradiation of the heating lamp 12, so that formed solid particles roll down along the surface of the rotary leaf membrane 6 under the action of gravity, the single evaporation granulation amount of the atomized liquid drops is balanced by the arranged rotary leaf membrane 6, the evaporation effect of the heating lamp 12 on the atomized liquid drops on the lower layer is isolated, and the successive fusion process of different liquid fertilizers during granulation is ensured; after the atomized liquid drops above the rotary vane membrane 6 are solidified and formed under the evaporation effect of the heating lamp 12, the atomized liquid drops roll down along the groove 61 formed in the rotary vane membrane 6, the metal sheet arranged in the groove 61 can conduct heat radiated by the heating lamp 12, the fertilizer solid particles rolling in the groove 61 are further insulated, the dryness of the fertilizer solid particles is maintained, and the particles 62 protruding on the surface of the metal sheet reduce the contact area between the fertilizer solid particles and the groove 61, so that the rolling state of the fertilizer solid particles is favorably maintained; the decelerating ridges 63 are arranged to control the fertilizer solid particles in the rolling process, atomized liquid drops are attached to the surfaces of the rotating leaf membranes 6 in the operation process and gradually condensed to form liquid beads which roll down, and the arranged herringbone inclined raised strips 64 guide the liquid beads which roll down and are gathered into the grooves 61 to be contacted and absorbed by the fertilizer solid particles which roll in the grooves; steam entering the pipeline 41 from the return port 13 is condensed into liquid and enters the proportioning tank 4, when mixed gas pumps liquid fertilizer along with the guniting pipe 2, pressure difference is generated at the through port 16, the gas in the proportioning tank 4 is brought into the guniting barrel 1, and then the circulation of the gas is completed by matching the return port 13 at the top of the guniting barrel 1 with the pipeline 41, so that the circulation effect of the steam is promoted, and meanwhile, a gap between the arc-shaped basin 15 and the inner wall of the guniting barrel 1 is formed, so that the circulating airflow flows in the inner wall area of the guniting barrel 1, the suspension state of atomized liquid drops in the guniting barrel 1 is prevented from being interfered, and the atomized liquid drops are prevented from being attached to the inner wall of the guniting barrel 1; the rising surface 52 arranged at the bottom of the granule collecting groove 5 makes the fertilizer solid granules fall into the valley area of the rising surface 52, and the net surface 53 arranged at the valley area is matched, the fertilizer solid granules in the rising surface are blown by the ascending air flow at the bottom of the guniting cylinder 1, atomized liquid drops on the surface of the fertilizer solid granules are air-dried, and the fertilizer solid granules in the granule collecting groove 5 move to enter the material collecting pipe 51 to be discharged.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.