Instant potassium sulfate fertilizer and preparation method thereof based on crystallization regulation

Abstract

The invention relates to the technical field of agricultural fertilizers, in particular to an instant potassium sulfate fertilizer and a preparation method thereof based on crystallization regulation, and the instant potassium sulfate fertilizer comprises the following components in parts by mass: 100-200 parts of potassium sulfate, 5-10 parts of a cosolvent, 0.3-0.5 part of a water softener and 0.3-0.5 part of a dispersant. Wherein the cosolvent is hydroxypropyl-beta-cyclodextrin or ammonium chloride, the water softener is any one of disodium ethylene diamine tetraacetate and sodium tripolyphosphate, and the dispersing agent is any one of sodium hexametaphosphate and tetrasodium pyrophosphate. According to the invention, the cosolvent is added in potassium sulfate, and in the prior art, potassium sulfate is generally irrigated and fertilized in a water and fertilizer manner, and a small amount of solid fertilizer is used because the dissolving speed and the dissolving rate of solid potassium sulfate are low, so that the fertility of the solid fertilizer is difficult to absorb by a root system after the solid fertilizer is fertilized; and after the hydroxypropyl-beta-cyclodextrin or ammonium chloride is added, the dissolution rate of the solid in the soil is increased, and the application requirement of the instant potassium sulfate fertilizer can be met by using the instant potassium sulfate fertilizer disclosed by the invention.

Description

Technical Field

[0001] The invention relates to the technical field of agricultural fertilizers, and in particular to an instant potassium sulfate fertilizer and a preparation method thereof based on crystallization regulation. Background Art

[0002] Instant potassium sulfate fertilizer has the characteristics of rapid dissolution in water and high crop absorption rate. It can realize water-fertilizer integration in agricultural sprinkler irrigation and drip irrigation, achieving the purpose of saving labor, increasing production, saving water and saving fertilizer. At present, half of the country's cultivated land irrigation and fertilization processes have the conditions for water-fertilizer integration, but its actual application is less than 4%, so instant potassium sulfate fertilizer has broad application prospects.

[0003] The insoluble matter ratio of the instant potassium sulfate fertilizer that can be put into use is between 0.1% and 0.3%. If the insoluble matter ratio of the potassium sulfate fertilizer used does not meet the requirements, its dripper or nozzle is easily blocked, resulting in uneven fertilization and increased equipment maintenance costs.

[0004] In the prior art, the method of hot dissolution + cold crystallization is used to improve the purity of agricultural potassium sulfate and remove water-insoluble matter, which requires purification through steps such as dissolution, centrifugation, and drying. However, in actual production, the equipment cost and time cost of each step are far beyond expectations. In addition, due to the huge amount of potassium sulfate fertilizer used, the production efficiency issue needs to be considered. If the comprehensive cost cannot be reduced to a reasonable level, this preparation method cannot be used. Summary of the invention

[0005] The present invention aims to provide an instant potassium sulfate fertilizer and a preparation method thereof based on crystallization regulation to solve the above problems.

[0006] The present invention is achieved through the following technical solutions: An instant potassium sulfate fertilizer comprises 100-200 parts by weight of potassium sulfate, 5-10 parts by weight of a cosolvent, 0.3-0.5 parts by weight of a water softener, and 0.3-0.5 parts by weight of a dispersant, wherein the cosolvent is hydroxypropyl-β-cyclodextrin or ammonium chloride, the water softener is any one of disodium ethylenediaminetetraacetate and sodium tripolyphosphate, and the dispersant is any one of sodium hexametaphosphate and tetrasodium pyrophosphate.

[0007] The present invention adds a solubility aid to potassium sulfate. In the prior art, potassium sulfate is usually irrigated and fertilized in the form of water fertilizer, and solid fertilizer is used less. The reason is that the dissolution speed and dissolution rate of solid potassium sulfate are low, which makes it difficult for the fertility of solid fertilizer to be absorbed by the root system after fertilization. After adding hydroxypropyl-β-cyclodextrin or ammonium chloride, the dissolution rate of the solid in the soil is increased. When water fertilizer cannot be used for irrigation, the instant potassium sulfate fertilizer of the present invention can meet the fertilization requirements.

[0008] A preparation method of instant potassium sulfate fertilizer based on crystallization regulation comprises the following steps: S1: potassium sulfate dissolution; Add 100-200 parts of agricultural potassium sulfate solid and 800-1500 parts of crystallization mother liquor into the dissolution module; S2: filtration of insoluble matter; After complete dissolution, the mixed solution is added to the filtration module to filter out the insoluble matter; S3: cooling crystallization; After the insoluble matter is separated, it enters the crystallization module to obtain solid potassium sulfate crystals. In the crystallization module, the potassium sulfate solution reduces the temperature to 10 degrees within 3 minutes and maintains at 10 degrees for at least ten minutes, then increases the temperature to 15 degrees and maintains for at least twenty minutes; S4: Potassium sulfate fertilizer mixture; Adding potassium sulfate crystals, 5-10 parts of a cosolvent, 0.3-0.5 parts of a water softener, and 0.3-0.5 parts of a dispersant into a mixing module to obtain potassium sulfate fertilizer; S5: Dry; The potassium sulfate fertilizer is added into the drying module to obtain the finished potassium sulfate fertilizer.

[0009] The dissolving module, filtering module, crystallizing module, mixing module and drying module are all connected in sequence through pipelines to realize the full-automatic production of potassium sulfate fertilizer.

[0010] The present invention provides a dissolving module, a filtering module, a crystallizing module, a mixing module and a drying module to efficiently remove insoluble matter in agricultural potassium sulfate. Due to the modularization, instant potassium sulfate can be prepared on a large scale.

[0011] Preferably, the filtration module comprises a centrifuge and a centrifugal container 1, wherein the centrifugal container 1 is installed on the centrifuge, and when the centrifuge is working, the centrifugal container 1 is driven by the centrifuge to rotate at a high speed; The centrifugal container 1 includes an upper container, a lower container, a support column, and a filter container, wherein the upper container and the lower container have the same shape, both are hollow truncated cones, the lower bottom surface of the upper container corresponds to the lower bottom surface of the lower container, and they are fixedly installed through the support column, so that there is a gap between the upper container and the lower container, and the filter container is sealed and installed on the gap, wherein the upper bottom surface of the upper container is provided with a feed port, and the upper bottom surface of the lower container is provided with a mounting portion, so that the centrifugal container 1 is fixedly installed and fixed to the centrifuge; The present invention improves the small-scale test tube centrifuge container in the prior art into a centrifuge container comprising an upper container, a lower container, a support column and a filtering container by improving the centrifuge container. When the centrifuge rotates, the centrifuge container can squeeze insoluble matter into the filtering container. After the filtration is completed, the solution is removed and the filtering container is taken out, thereby realizing large-capacity centrifugal filtration of insoluble matter.

[0012] Preferably, the filtration module and the dissolution module are assembled on the same module, and this assembled module includes a centrifuge, a second centrifugal container, and a dissolution filtration container, wherein the dissolution filtration container is mounted and fixed on the second centrifugal container, the second centrifugal container is mounted and fixed on the centrifuge, a discharge port is provided below the dissolution filtration container, a feed port is provided above the second centrifugal container, the discharge port of the dissolution filtration container corresponds to the feed port of the second centrifugal container in position, and is sealed and fixedly connected, a switchable baffle plate 1 is provided between the feed port and the discharge port, the dissolution filtration container is in the shape of a hollow cylinder without an upper bottom, a filter cartridge is provided inside the cylinder, the contour shape of the second centrifugal container is in the shape of a hollow truncated cone, the inside of the truncated cone wall is also hollow, wherein the inside of the truncated cone wall is a container for a mixed liquid, and an insoluble container is provided at the bottom of the second centrifugal container, the insoluble container is detachably connected to the second centrifugal container, a switchable baffle plate 2 is provided in the insoluble container, and when the insoluble matter is taken out, the baffle plate 2 is opened to release the mixed liquid into the crystallization module.

[0013] In order to improve the dissolution efficiency and the filtration efficiency, the present invention integrates the filtration module and the dissolution module on the same module, and by setting the dissolution filter, the first insoluble matter filtration can be achieved during the dissolution. After the solution after the first filtration enters the centrifugal container 2, the centrifugal container 2 is rotated at a high speed to centrifuge the insoluble matter into the insoluble matter container. After the centrifugation is completed, the baffle 2 is closed and the insoluble matter container is taken out, and a high-purity potassium sulfate solution is obtained.

[0014] Preferably, the discharge port of the dissolution and filtration container and the feed port of the second centrifugal container are both annular holes, and their sizes and positions correspond to each other, wherein the discharge port of the dissolution and filtration container is located between the outer wall of the filter cylinder and the inner wall of the dissolution and filtration container.

[0015] The discharge port of the dissolution and filtration container and the feed port of the second centrifugal container of the present invention are both annular holes, which are convenient for installation and disassembly, and can be quickly installed and disassembled through threaded connection or mortise and tenon connection.

[0016] Preferably, the mixing module and the drying module are assembled on the same module, and this dry mixing assembly module includes a shell, a crushing device, a wind-generating device, a flow-guiding device, and a flipping device, wherein the shape of the shell is a combination of a hollow cylinder without an upper bottom and a hollow hemisphere, and the hollow hemisphere and the hollow cylinder are detachably connected, the wind-generating device is installed and fixed on the inner bottom of the shell, the flow-guiding device is installed and fixed on the inner side of the shell, the crushing device is installed and fixed in the flow-guiding device, and the flipping device is installed and fixed on the outer side of the shell.

[0017] In order to improve the mixing efficiency and the drying efficiency, the present invention arranges a shell, a crushing device, a wind generating device, a flow guiding device and a turning device, so as to mix potassium sulfate with a co-solvent, a water softener and a dispersant, and also dries the potassium sulfate crystals after the crystallization is completed.

[0018] Preferably, the guide device is a combination of a hollow cone without upper and lower bottoms and a hollow cylinder without upper and lower bottoms, wherein the radius of the cylinder is the same as the radius of the upper bottom of the cone, and a crushing device is installed and fixed at the position where the cone and the cylinder are connected, and a mounting bracket is provided on the outside of the guide device so that the guide device is installed and fixed on the inside of the shell.

[0019] The present invention provides a crushing device in the guide device. When there are relatively large crystals of potassium sulfate, uneven mixing will occur. Therefore, after the crushing device is provided, all large crystals are broken into small crystals, so that the mixing is more uniform.

[0020] Preferably, the assembly module of the mixing module and the drying module further comprises a vacuum pumping device, wherein a vacuum hole is provided on the shell, and a vacuum pipe of the vacuum pumping device is installed and fixed in the vacuum hole and is sealedly connected to the vacuum hole.

[0021] Since the air fluid speed brought by the wind-generating device is limited in a closed space, a vacuum device is added to extract part of the air in the shell to make the shell in a negative pressure state. Since the lower the pressure, the lower the boiling point during the evaporation and drying process, the negative pressure state in the shell makes the evaporation and drying efficiency higher. In addition, since the air is still retained in the shell, mixing and evaporation are still carried out at the same time.

[0022] Preferably, the mixing module and the drying module are assembled on the same module, and the drying mixing assembly module includes a shell, a crushing device, a wind-generating device, a flow-guiding device, and a flipping device, wherein the shell is shaped like a hollow sphere, and a plurality of wind-generating devices are provided at the lower inner side of the shell, and a plurality of flow-guiding devices are provided in the middle of the shell. The flow-guiding device is installed and fixed in the shell through a mounting plate, the crushing device is installed and fixed in the flow-guiding device, and the flipping device is installed and fixed on the outer side of the shell.

[0023] When the scale of potassium sulfate mixing is large, the present invention sets the shell to be a sphere. At this time, a number of wind-generating devices and flow-guiding devices are arranged in the shell to improve the comprehensive efficiency during large-scale mixing and drying. The sphere can withstand higher negative pressure and more efficient air circulation. According to the rotation of the shell material, the efficiency of mixing and drying of potassium sulfate fertilizer can be maximized.

[0024] Preferably, a plurality of feed ports are provided on any shell, the number of the feed ports is the same as the number of the guide devices, and the positions of the feed ports correspond to the positions of the guide devices, so that the crystals enter the crushing device first after feeding.

[0025] In order to prevent oversized crystals from being unable to be blown up by the wind, the feed port is directly set on the guide device, so that the crystals can enter the guide device to a limited extent and fall on the crushing device for crushing, so that all crystals can be blown up after the wind-generating device is turned on.

[0026] Compared with the prior art, the present invention has the following advantages and beneficial effects: The present invention adds a solubility aid to potassium sulfate. In the prior art, potassium sulfate is usually irrigated and fertilized in the form of water fertilizer, and solid fertilizer is used less. The reason is that the dissolution speed and dissolution rate of solid potassium sulfate are low, which makes it difficult for the fertility of solid fertilizer to be absorbed by the root system after fertilization. After adding hydroxypropyl-β-cyclodextrin or ammonium chloride, the dissolution rate of the solid in the soil is increased. When water fertilizer cannot be used for irrigation, the instant potassium sulfate fertilizer of the present invention can meet the fertilization requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings: Figure 1 It is a flow chart of the present invention; Figure 2 This is a schematic diagram of the structure of the centrifugal container 1 in Example 2; Figure 3 This is a schematic diagram of the structure of the centrifugal container 2 in Example 3; Figure 4 This is a schematic diagram of the structure of the dry mixing assembly module in Example 2; Figure 5 This is a schematic diagram of the structure of the dry mixing assembly module in Example 4.

[0028] The reference numerals represent: 1-centrifugal container one, 11-upper container, 12-lower container, 13-support column, 14-filtration container, 2-drying mixing assembly module, 21-shell, 22-crushing device, 23-wind generating device, 24-flow guiding device, 25-turning device, 3-centrifugal container two, 4-dissolution filtration container, 41-filter cartridge, 5-baffle one, 6-baffle two. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0030] It should be noted that if the description and claims of the present application and the above-mentioned drawings relate to the terms "first", "second", etc., they are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, if the terms "including" and "having" and any of their variations are involved, it is intended to cover non-exclusive inclusions, for example, the process, method, system, product or equipment that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0031] In this application, if the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. are involved, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0032] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0033] In addition, in this application, the terms "installed", "set", "provided with", "connected", "connected", "socketed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0034] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0035] Embodiment 1;

[0036] This example compares the dissolution rate of instant potassium sulfate fertilizer under different parameters and different ratios, where: Test group: 100 g potassium sulfate, 5 g cosolvent, 0.3 g water softener, 0.3 g dispersant, wherein the cosolvent is hydroxypropyl-β-cyclodextrin, the water softener is disodium ethylenediaminetetraacetate, and the dispersant is sodium hexametaphosphate.

[0037] Control group 1: 100 g potassium sulfate, 0.3 g water softener, 0.3 g dispersant. The water softener is disodium ethylenediaminetetraacetate, and the dispersant is sodium hexametaphosphate.

[0038] Control group 2: 100 g of potassium sulfate.

[0039] Experiment 1: Add the test group, control group 1, and control group 2 into 1 liter of water respectively, stir thoroughly at 20 degrees and 80 revolutions per minute, and measure the time for complete dissolution.

[0040] Experiment 1 data: The complete dissolution time of the test group, control group 1, and control group 2 were 6.7 seconds, 12.3 seconds, and 12.5 seconds, respectively.

[0041] The data showed that the dissolution rate of the test group doubled after adding 5 grams of hydroxypropyl-β-cyclodextrin as a solvent.

[0042] Embodiment 2;

[0043] according to Figure 1-5 As shown, a preparation method of instant potassium sulfate fertilizer based on crystallization regulation comprises the following steps: S1: potassium sulfate dissolution; Add 100 parts of agricultural potassium sulfate solid and 800 parts of crystallization mother liquor into the dissolution module; S2: filtration of insoluble matter; After complete dissolution, the mixed solution is added to the filtration module to filter out the insoluble matter; S3: cooling crystallization; After the insoluble matter is separated, it enters the crystallization module to obtain solid potassium sulfate crystals. In the crystallization module, the potassium sulfate solution reduces the temperature to 10 degrees within 3 minutes and maintains at 10 degrees for at least ten minutes, then increases the temperature to 15 degrees and maintains for at least twenty minutes; The purity of potassium sulfate crystals obtained through S3 is 99%-99.9%, and the proportion of crystalline potassium sulfate with a particle size below 0.2mm is 90%-99%.

[0044] The higher the purity of potassium sulfate crystals, the higher their solubility. On this basis, this embodiment adds a co-solvent, so that its solubility at 20 degrees Celsius is about 180 grams / 100 milliliters of water, which is much greater than the solubility of agricultural potassium sulfate - at 20 degrees Celsius, the solubility is about 100 grams / 100 milliliters of water.

[0045] S4: Potassium sulfate fertilizer mixture; Adding potassium sulfate crystals, 5 parts of a cosolvent, 0.3 parts of a water softener, and 0.3 parts of a dispersant into a mixing module to obtain potassium sulfate fertilizer; S5: Dry; The potassium sulfate fertilizer is added into the drying module to obtain the finished potassium sulfate fertilizer.

[0046] The dissolving module, filtering module, crystallizing module, mixing module and drying module are all connected in sequence through pipelines to realize the full-automatic production of potassium sulfate fertilizer.

[0047] The present invention provides a dissolving module, a filtering module, a crystallizing module, a mixing module and a drying module to efficiently remove insoluble matter in agricultural potassium sulfate. Due to the modularization, instant potassium sulfate can be prepared on a large scale.

[0048] It can be understood that in this embodiment, the crystallization module is a prior art, and potassium sulfate crystals are obtained by rapid cooling.

[0049] In this embodiment, the filtration module includes a centrifuge and a centrifugal container 1, wherein the centrifugal container 1 is installed on the centrifuge. When the centrifuge is working, the centrifugal container 1 is driven by the centrifuge to rotate at a high speed. The centrifugal container 1 comprises an upper container 11, a lower container 12, a support column 13, and a filter container 14, wherein the upper container 11 and the lower container 12 have the same shape, both being hollow truncated cones, the lower bottom surface of the upper container 11 corresponds to the lower bottom surface of the lower container 12, and is fixedly installed by the support column 13, so that there is a gap between the upper container 11 and the lower container 12, and the filter container 14 is sealed and installed on the gap, wherein the upper bottom surface of the upper container 11 is provided with a feed port, and the upper bottom surface of the lower container 12 is provided with a mounting portion, so that the centrifugal container 1 is fixedly installed and fixed to the centrifuge; In this embodiment, the centrifuge is a prior art centrifuge that provides high-speed rotation for the centrifugal container 1.

[0050] The present invention improves the small-scale test tube centrifuge container 1 in the prior art into a centrifuge container 1 including an upper container 11, a lower container 12, a support column 13, and a filter container 14 by improving the centrifuge container 1. When the centrifuge rotates, the centrifuge container 1 can squeeze insoluble matter into the filter container 14. After the filtration is completed, the solution is discharged and the filter container 14 is taken out, thereby realizing large-capacity centrifugal filtration of insoluble matter.

[0051] In this embodiment, the mixing module and the drying module are integrated on the same module, and the drying mixing assembly module 2 includes a shell 21, a crushing device 22, a wind generating device 23, a flow guiding device 24, and a flipping device 25, wherein the shell 21 is shaped as a combination of a hollow cylinder without an upper bottom and a hollow hemisphere, and the hollow hemisphere and the hollow cylinder are detachably connected, the wind generating device 23 is installed and fixed on the inner bottom of the shell 21, the flow guiding device 24 is installed and fixed on the inner side of the shell 21, the crushing device 22 is installed and fixed in the flow guiding device 24, and the flipping device 25 is installed and fixed on the outer side of the shell 21.

[0052] In this embodiment, the wind-generating device 23 is a fan blade driven by a motor in the prior art, the flipping device 25 is driven by a servo motor in the prior art, and the crushing device 22 is a crushing blade or a crushing roller in the prior art.

[0053] In order to improve the mixing efficiency and the drying efficiency, the present invention arranges a shell 21, a crushing device 22, a wind generating device 23, a flow guiding device 24, and a turning device 25, so as to mix potassium sulfate with a co-solvent, a water softener, and a dispersant, and also dry the potassium sulfate crystals after the crystallization is completed.

[0054] In this embodiment, the guide device 24 is a combination of a hollow cone without upper and lower bottoms and a hollow cylinder without upper and lower bottoms, wherein the radius of the cylinder is the same as the radius of the upper bottom of the cone, and a crushing device 22 is installed and fixed at the position where the cone and the cylinder are connected, and a mounting bracket is provided on the outside of the guide device 24, so that the guide device 24 is installed and fixed on the inside of the shell 21.

[0055] The present invention is provided with a crushing device 22 in the guide device 24. When there are relatively large crystals of potassium sulfate, uneven mixing will occur. Therefore, after the crushing device 22 is provided, all large crystals are broken into small crystals, so that the mixing is more uniform.

[0056] In this embodiment, the assembly module of the mixing module and the drying module further includes a vacuum pumping device, wherein a vacuum hole is provided on the shell 21, and a vacuum pipe of the vacuum pumping device is installed and fixed in the vacuum hole and sealedly connected to the vacuum hole.

[0057] Since the air fluid speed brought by the wind-generating device 23 is limited in the enclosed space, a vacuum device is added to extract part of the air in the shell 21, so that the shell 21 is in a negative pressure state. Since during the evaporative drying process, the lower the pressure, the lower the boiling point, the negative pressure state in the shell 21 makes the evaporative drying efficiency higher. In addition, since the air is still retained in the shell 21, mixing and evaporation are still carried out simultaneously.

[0058] Embodiment 3;

[0059] according to Figure 1-5 As shown, on the basis of Example 2, different from it, in this embodiment, the filtration module and the dissolution module are assembled on the same module, and this assembly module includes a centrifuge, a centrifugal container 2 3, and a dissolution filtration container 4, wherein the dissolution filtration container 4 is mounted and fixed on the centrifugal container 2 3, the centrifugal container 2 3 is mounted and fixed on the centrifuge, a discharge port is provided below the dissolution filtration container 4, and a feed port is provided above the centrifugal container 2 3, the discharge port of the dissolution filtration container 4 corresponds to the feed port of the centrifugal container 2 3, and is sealed and fixedly connected, and the feed port is fixed to the centrifugal container 2 3. A switchable baffle plate 5 is provided between the material port and the discharge port. The dissolution and filtration container 4 is in the shape of a hollow cylinder without an upper bottom, and a filter cartridge 41 is provided inside the container. The outline shape of the centrifugal container 2 3 is a hollow truncated cone, and the inside of the truncated cone wall is also hollow, wherein the inside of the truncated cone wall is a container for the mixed liquid, and an insoluble container is provided at the bottom of the centrifugal container 2 3, and the insoluble container is detachably connected to the centrifugal container 2 3, and a switchable baffle plate 2 6 is provided in the insoluble container. When the insoluble matter is taken out, the baffle plate 2 6 is opened to release the mixed liquid into the crystallization module.

[0060] In order to improve the dissolution efficiency and the filtration efficiency, the present invention integrates the filtration module and the dissolution module on the same module, and by setting a dissolution filter, the first insoluble matter filtration can be achieved during the dissolution. After the solution after the first filtration enters the centrifugal container 2 3, the centrifugal container 2 3 is rotated at high speed to centrifuge the insoluble matter into the insoluble matter container. After the centrifugation is completed, the baffle 2 6 is closed and the insoluble matter container is taken out, and a high-purity potassium sulfate solution is obtained.

[0061] In this embodiment, the discharge port of the dissolution and filtration container 4 and the feed port of the centrifugal container 2 3 are both annular holes, and their sizes and positions correspond to each other, wherein the discharge port of the dissolution and filtration container 4 is located between the outer wall of the filter cylinder 41 and the inner wall of the dissolution and filtration container 4.

[0062] The discharge port of the dissolution and filtration container 4 and the feed port of the centrifugal container 2 3 of the present invention are both annular holes, which are convenient for installation and disassembly, and can be quickly installed and disassembled through threaded connection or mortise and tenon connection.

[0063] Embodiment 4;

[0064] according to Figure 1-5As shown, on the basis of Example 2, the difference is that in this embodiment, the mixing module and the drying module are integrated on the same module, and the drying mixing assembly module 2 includes a shell 21, a crushing device 22, a wind-generating device 23, a flow-guiding device 24, and a flipping device 25, wherein the shell 21 is shaped like a hollow sphere, and a plurality of wind-generating devices 23 are provided at the lower inner side of the shell 21, and a plurality of flow-guiding devices 24 are provided in the middle of the shell 21. The flow-guiding device 24 is fixed in the shell 21 through a mounting plate, the crushing device 22 is fixed in the flow-guiding device 24, and the flipping device 25 is fixed on the outer side of the shell 21.

[0065] When the scale of potassium sulfate mixing is large, the present invention sets the shell 21 as a sphere. At this time, a plurality of wind-generating devices 23 and flow-guiding devices 24 are arranged in the shell 21 to improve the comprehensive efficiency during large-scale mixing and drying. The sphere can withstand higher negative pressure and more efficient air circulation. According to the rotation of the shell 21 material, the efficiency of mixing and drying of potassium sulfate fertilizer can be maximized.

[0066] In this embodiment, a plurality of feed ports are provided on the top of any shell 21, the number of the feed ports is the same as the number of the guide devices 24, and the positions of the feed ports correspond to the positions of the guide devices 24, so that the crystals enter the crushing device 22 first after feeding.

[0067] In order to prevent oversized crystals from being unable to be blown up by the wind, the feed port is directly set on the guide device 24, so that the crystals can enter the guide device 24 to a limited extent and fall on the crushing device 22 for crushing, so that all crystals can be blown up after the wind-generating device 23 is turned on.

[0068] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A quick-dissolving potassium sulfate fertilizer, characterized in that: The invention comprises 100-200 parts by weight of potassium sulfate, 5-10 parts by weight of a cosolvent, 0.3-0.5 parts by weight of a water softener, and 0.3-0.5 parts by weight of a dispersant, wherein the cosolvent is hydroxypropyl-β-cyclodextrin or ammonium chloride, the water softener is any one of disodium ethylenediaminetetraacetate and sodium tripolyphosphate, and the dispersant is any one of sodium hexametaphosphate and tetrasodium pyrophosphate.

2. A method for preparing an instant potassium sulfate fertilizer based on crystallization regulation, for preparing an instant potassium sulfate fertilizer as claimed in claim 1, characterized in that: The steps include: S1: potassium sulfate dissolution; Add 100-200 parts of agricultural potassium sulfate solid and 800-1500 parts of crystallization mother liquor into the dissolution module; S2: filtration of insoluble matter; After complete dissolution, the mixed solution is added to the filtration module to filter out the insoluble matter; S3: cooling crystallization; After the insoluble matter is separated, it enters the crystallization module to obtain solid potassium sulfate crystals. In the crystallization module, the potassium sulfate solution reduces the temperature to 10 degrees within 3 minutes and maintains at 10 degrees for at least ten minutes, then increases the temperature to 15 degrees and maintains for at least twenty minutes; S4: Potassium sulfate fertilizer mixture; Adding potassium sulfate crystals, 5-10 parts of a cosolvent, 0.3-0.5 parts of a water softener, and 0.3-0.5 parts of a dispersant into a mixing module to obtain potassium sulfate fertilizer; S5: Dry; Adding potassium sulfate fertilizer into the drying module to obtain a finished potassium sulfate fertilizer; The dissolving module, filtering module, crystallizing module, mixing module and drying module are all connected in sequence through pipelines to realize the full-automatic production of potassium sulfate fertilizer.

3. A method for preparing instant potassium sulfate fertilizer based on crystallization regulation according to claim 2, characterized in that: The filtration module comprises a centrifuge and a centrifugal container (1), wherein the centrifugal container (1) is mounted on the centrifuge. When the centrifuge is working, the centrifugal container (1) is driven by the centrifuge to rotate at a high speed. A centrifugal container (1) comprises an upper container (11), a lower container (12), a support column (13), and a filter container (14), wherein the upper container (11) and the lower container (12) have the same shape, both being hollow truncated cones, the lower bottom surface of the upper container (11) corresponds to the lower bottom surface of the lower container (12), and they are fixedly mounted via the support column (13), so that a gap exists directly between the upper container (11) and the lower container (12), and the filter container (14) is sealingly mounted on the gap, wherein the upper bottom surface of the upper container (11) is provided with a feed port, and the upper bottom surface of the lower container (12) is provided with a mounting portion, so that the centrifugal container (1) is fixedly mounted on the centrifuge.

4. The preparation method of instant potassium sulfate fertilizer based on crystallization regulation according to claim 2, characterized in that: The filtration module and the dissolution module are assembled on the same module. The assembled module comprises a centrifuge, a second centrifugal container (3), and a dissolution filtration container (4). The dissolution filtration container (4) is mounted and fixed on the second centrifugal container (3). The second centrifugal container (3) is mounted and fixed on the centrifuge. A discharge port is provided below the dissolution filtration container (4). A feed port is provided above the second centrifugal container (3). The discharge port of the dissolution filtration container (4) corresponds to the feed port of the second centrifugal container (3). The two are sealed and fixedly connected. An openable opening is provided between the feed port and the discharge port. The dissolution and filtration container (4) is in the shape of a hollow cylinder without an upper bottom, and a filter cartridge (41) is arranged inside the cylinder. The outline of the centrifugal container (3) is in the shape of a hollow truncated cone, and the inside of the truncated cone wall is also hollow, wherein the inside of the truncated cone wall is a container for the mixed liquid, and an insoluble container is arranged at the bottom of the centrifugal container (3), and the insoluble container is detachably connected to the centrifugal container (3). A switchable baffle (6) is arranged in the insoluble container. When the insoluble matter is taken out, the baffle (6) is opened to release the mixed liquid into the crystallization module.

5. The method for preparing instant potassium sulfate fertilizer based on crystallization regulation according to claim 4, characterized in that: The discharge port of the dissolution and filtration container (4) and the feed port of the second centrifugal container (3) are both annular holes, and their sizes and positions correspond to each other, wherein the discharge port of the dissolution and filtration container (4) is located between the outer wall of the filter cylinder (41) and the inner wall of the dissolution and filtration container (4).

6. The method for preparing instant potassium sulfate fertilizer based on crystallization regulation according to claim 2, characterized in that: The mixing module and the drying module are assembled on the same module. The drying mixing assembly module (2) comprises a shell (21), a crushing device (22), a wind generating device (23), a flow guiding device (24), and a turning device (25). The shell (21) is shaped as a combination of a hollow cylinder without an upper bottom and a hollow hemisphere, and the hollow hemisphere and the hollow cylinder are detachably connected. The wind generating device (23) is mounted and fixed on the bottom of the inner side of the shell (21), the flow guiding device (24) is mounted and fixed on the inner side of the shell (21), the crushing device (22) is mounted and fixed in the flow guiding device (24), and the turning device (25) is mounted and fixed on the outer side of the shell (21).

7. The method for preparing instant potassium sulfate fertilizer based on crystallization regulation according to claim 6, characterized in that: The flow guide device (24) is a combination of a hollow truncated cone without upper and lower bottoms and a hollow cylinder without upper and lower bottoms, wherein the radius of the cylinder is the same as the radius of the upper bottom of the truncated cone. A pulverizing device (22) is fixedly installed at the connection position between the truncated cone and the cylinder. A mounting bracket is provided on the outside of the flow guide device (24), so that the flow guide device (24) is fixedly installed on the inside of the shell (21).

8. The method for preparing instant potassium sulfate fertilizer based on crystallization regulation according to claim 7, characterized in that: The assembly module of the mixing module and the drying module further comprises a vacuum pumping device, wherein a vacuum hole is provided on the shell (21), and a vacuum pipe of the vacuum pumping device is installed and fixed in the vacuum hole and is sealedly connected to the vacuum hole.

9. The method for preparing instant potassium sulfate fertilizer based on crystallization regulation according to claim 2, characterized in that: The mixing module and the drying module are assembled on the same module. The drying mixing assembly module (2) comprises a shell (21), a crushing device (22), a wind-generating device (23), a flow-guiding device (24), and a turning device (25). The shell (21) is in the shape of a hollow sphere. A plurality of wind-generating devices (23) are arranged at the lower inner side of the shell (21). A plurality of flow-guiding devices (24) are arranged in the middle of the shell (21). The flow-guiding devices (24) are fixedly mounted in the shell (21) via a mounting plate. The crushing device (22) is fixedly mounted in the flow-guiding device (24). The turning device (25) is fixedly mounted on the outer side of the shell (21).

10. A method for preparing instant potassium sulfate fertilizer based on crystallization regulation according to claim 8 or 9, characterized in that: A plurality of feed ports are provided on the top of any shell (21), the number of the feed ports being the same as the number of the flow guide devices (24), and the positions of the feed ports corresponding to the positions of the flow guide devices (24), so that after feeding, the crystals first enter the crushing device (22).

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