CN110590466B - Production process of full-water-soluble potassium-magnesium slow release fertilizer - Google Patents
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- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D1/00—Fertilisers containing potassium
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- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
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Abstract
A production process of a full water-soluble potassium-magnesium slow release fertilizer comprises the following steps: will be provided withPreparing a semi-finished potash magnesium fertilizer, fresh water and a crystallization mother liquor C, performing hot dissolution and solid-liquid separation to obtain a high-temperature mother liquor, performing vacuum cooling, crystallization and concentration to obtain a slurry, adding water into the slurry, performing high-temperature conversion, and performing heat preservation and filtration to obtain potash magnesium fertilizer particles; preparing coating liquid by using chitosan, polyvinyl alcohol, talcum powder and water as raw materials; and (3) preheating the obtained potassium magnesium fertilizer particles, and then coating the potassium magnesium fertilizer particles with the obtained coating liquid. The invention greatly reduces the investment of required equipment, and partial equipment is properly reformed on the basis of original production equipment; the potash magnesium fertilizer K produced by the process2The content of O is more than or equal to 35wt percent, and the content of water-insoluble substances is less than or equal to 0.2wt percent; the coating has good cohesiveness with the potash magnesium fertilizer, strong wrapping property, low cost and biodegradability; the obtained product has better slow release performance, and can play a role in improving soil nutrients and increasing yield and efficiency for crop growth.
Description
Technical Field
The invention relates to a production process of a potassium-magnesium slow release fertilizer, in particular to a production process of a water-soluble potassium-magnesium slow release fertilizer.
Background
Compared with the traditional potassium sulfate, the potash magnesium sulphate fertilizer increases magnesium medium elements, can provide more comprehensive and balanced nutrients for plants, and is more suitable for being applied to economic crops such as vegetables, fruit trees, tobacco, tea, flowers and the like. However, China is a state lacking in solid potassium salt mines, most of the potassium sulfate magnesium fertilizer is prepared by tedding brine in a salt pan to form ores, mechanically harvesting and then performing flotation processing, and the obtained product generally has the defects of poor water solubility, low effective utilization rate of the fertilizer and the like.
With the continuous development of agriculture and rural economy in China, farmers put forward new requirements on chemical fertilizers, and the problems of scientific fertilization, convenient fertilization and improvement of fertilizer utilization rate become very much of attention of the farmers at present.
Because the waste phenomenon is serious in the using process of the fertilizer, the novel slow and controlled release compound fertilizer becomes the development direction of the fertilizer industry in the world nowadays. The slow release fertilizer can slowly release the available nutrients of crops along with time through the chemical compound or physical action of the nutrients, so that the utilization rate of the fertilizer can be effectively improved, and the pollution of the fertilizer to the environment is reduced, therefore, the research of the slow release fertilizer is in one of the hot research fields at present.
CN108585960A discloses a method for preparing potash magnesium fertilizer, which is obtained by using the modes of mixed roasting, leaching and evaporative crystallization of polyhalite and potash feldspar, but the defects of high process energy consumption and water consumption, low fertilizer efficiency of the obtained product and the like exist because the polyhalite and the potash feldspar have stable structures.
CN107324849A discloses a method for preparing potash magnesium sulphate fertilizer, which is to add water into picromerite product for hot melting, heat preservation and filtration, mix and dry crystallized solid phase obtained by cooling crystallized solid phase and mother liquor, and granulate to obtain K2The method improves the potassium grade of the potash magnesium sulphate fertilizer product, but does not improve the water solubility and fertilizer efficiency control effect of the product.
CN109987995A discloses a mixed type controlled-release fertilizer and a preparation method thereof, which is obtained by compounding and blending different types of nutrients between a common fertilizer and a controlled-release fertilizer or a controlled-release fertilizer according to a certain proportion, but is limited by the cost of the controlled-release fertilizer and has higher price.
CN110066191A discloses a novel process for producing potassium magnesium phosphate of slow-release compound fertilizer, which takes magnesium oxide as a starting material and adopts acid-base neutralization reaction and double decomposition reaction to prepare the potassium magnesium phosphate, but the acid-base consumption of the method is large, the reaction progress is difficult to control, and the method is not suitable for quality improvement and reconstruction of the existing potassium-magnesium fertilizer production enterprises.
The traditional slow release material is mainly used for nitrogen fertilizers, microbial fertilizers and compound fertilizers, is difficult to degrade, can influence the physical and chemical properties of soil after being applied for a long time, and has no open technology for the production research of potassium-magnesium fertilizer slow release fertilizers at present.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects in the prior art and provides a production process of a full water-soluble potassium-magnesium slow-release fertilizer.
The technical scheme adopted by the invention for solving the technical problems is as follows: a production process of a full water-soluble potassium-magnesium slow release fertilizer comprises the following steps:
(1) mixing the semi-finished potash magnesium fertilizer, fresh water and crystallization mother liquor C to obtain a mixture, and carrying out hot melting and solid-liquid separation to obtain clear high-temperature mother liquor; the chemical composition of the semi-finished potash magnesium fertilizer comprises: k+18.5～19.5wt%，Mg2+5.0～6.5wt%，SO4 2-46.0-48.0 wt%, and the content of water insoluble substances is less than or equal to 3.0 wt%; the chemical composition of the crystallization mother liquor C comprises: k+ 6.0～7.0wt%，Mg2+ 2.5～3.5wt%，SO4 2- 14.5～17.0wt%；
(2) Cooling the clarified high-temperature mother liquor in vacuum, precipitating crystals, settling, concentrating, separating out supernatant, returning the supernatant as crystallized mother liquor C to the step (1), and taking the obtained lower turbid part as slurry;
(3) adding fresh water into the slurry obtained in the step (2), converting at high temperature, and filtering at a heat preservation state to obtain fully water-soluble potassium-magnesium fertilizer particles;
(4) adding polyvinyl alcohol into water, heating until the polyvinyl alcohol is completely melted, adding chitosan and talcum powder, and uniformly stirring to obtain a coating liquid;
(5) and (4) preheating the fully water-soluble potassium-magnesium fertilizer particles obtained in the step (3) in a coating machine, spraying the coating liquid obtained in the step (4) on the surfaces of the fully water-soluble potassium-magnesium fertilizer particles for coating, and drying to obtain the finished product.
Preferably, in step (1), the chemical composition of the mixture comprises: k+ 6.5～8.0 wt%，Mg2+ 2.5～4.0 wt%，SO4 2- 16.5～20.0 wt%。
Preferably, in the step (1), the temperature of the hot melting is 90-110 ℃, and the time of the hot melting is 60-90 min; the solubility of the semi-finished potash magnesium sulphate fertilizer is increased when the temperature is increased, the solid-liquid conversion and dissolution of the semi-finished potash magnesium sulphate fertilizer are facilitated at high temperature, the saturation of the crystallization mother liquor C can be improved, and the dosage of the crystallization mother liquor C can be reduced.
Preferably, in the step (2), the vacuum cooling is to cool the mixture to 40-60 ℃; cooling, lowering the temperature and separating out K2SO4And K2SO4·MgSO4·4H2And (4) crystallizing the O.
Preferably, in the step (2), the concentration of the slurry is 40-60 wt%; the separated upper-layer high-temperature clear liquid is mother liquid containing magnesium, and slurry with high potassium and low magnesium is obtained.
Preferably, in the step (3), the mass ratio of the slurry to the fresh water is 1: 0.6-1.2.
Preferably, in the step (3), the high-temperature conversion temperature is 40-60 ℃, and the high-temperature conversion time is 60-90 min; in the course of high-temperature conversion, K2SO4·MgSO4·4H2MgSO in O4Is preferentially dissolved into the liquid phase, K2SO4Remain in the solid phase crystals. The Mg index in the crystal can be reduced through high-temperature conversion, and the K index is improved.
Preferably, in the step (4), the raw materials for preparing the coating liquid comprise the following components in percentage by mass: 5-10% of polyvinyl alcohol, 0.8-2.0% of chitosan, 3.0-5.0% of talcum powder and the balance of water; chitosan as skeleton, PVA as dispersant, talcum powder as inhibitor and water as regulator.
Preferably, in the step (5), preheating to the temperature of 60-80 ℃; the preheating is to improve the wrapping property of the potash magnesium fertilizer and the coating liquid and to mix the potash magnesium fertilizer and the coating liquid evenly, and fine micropores can be formed in the forming process to be beneficial to slow release of fertilizer efficiency.
Preferably, in the step (5), the amount of the coating liquid is 5-10% of the total weight of the uncoated full-water-soluble potassium-magnesium fertilizer particles; the dosage of the coating liquid is too small to completely wrap the potash magnesium fertilizer product, the slow release effect of the obtained product is not good, the dosage of the coating liquid is too large, the fertilizer release is too slow, and materials are wasted.
Compared with the prior art, the invention has the beneficial effects that: (1) the purposes of saving water in the process and improving the water solubility of the potash magnesium fertilizer are achieved by fully utilizing the mother liquor circulation and dissolving ores by a thermal method; (2) the vacuum cooling crystallization feed liquid is directly added with water for conversion after supernatant liquid is removed through sedimentation and concentration, and extra filtering equipment is not needed in the process of removing the supernatant liquid through sedimentation and concentration, so that the process limitation that the traditional process needs a two-step method of solid-liquid separation and water addition conversion is overcome, and the equipment investment is greatly reduced; (3) the coating material takes chitosan as a framework, polyvinyl alcohol as a dispersing agent, talcum powder as an inhibitor and water as a regulator, overcomes the technical defects of weak cohesiveness and wrapping property of the traditional coating material and the potash-magnesia fertilizer, and has the advantages of low cost, environmental friendliness and biodegradability; (4) the spray coating and the drying molding are integrated, and the purposes of quality improvement and upgrading of products can be achieved by properly modifying the original molding equipment; (5) the potash magnesium fertilizer K produced by the process2The content of O is more than or equal to 35wt%, the content of water-insoluble substances is less than or equal to 0.2wt%, and the fertilizer has good slow release performance and can play roles in improving soil nutrients and increasing yield and efficiency for crop growth.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
The embodiment adopts the semi-finished potash magnesium fertilizer produced by certain manufacturing enterprises in Xinjiang in China as raw materials, and the main chemical compositions of the semi-finished potash magnesium fertilizer comprise: k+18.59 wt%，Mg2+5.90 wt%，SO4 2-47.58 wt% and a water-insoluble content of 2.7 wt%.
(1) Mixing the semi-finished potash-magnesia fertilizer, fresh water and crystallization mother liquor C to obtain a mixture, wherein the chemical composition of the mixture comprises K+ 6.88 wt%，Mg2+ 3.15 wt%，SO4 2-16.56 wt%, and carrying out solid-liquid separation after hot melting for 90min at 95 ℃ to obtain clear high-temperature mother liquor;
wherein the chemical composition of the crystallization mother liquor C comprises: k+ 6.25wt%，Mg2+ 2.96wt%，SO4 2- 14.86wt%，H2O 72.29 wt%；
(2) Cooling the clear high-temperature mother liquor to 40 ℃ in vacuum, precipitating crystals, settling and concentrating, separating out supernatant liquid serving as crystallization mother liquor C, returning the crystallization mother liquor C to the step (1), and obtaining a lower turbid part which is slurry with the concentration of 55 wt%;
(3) adding water into the slurry obtained in the step (2), converting at a high temperature of 40 ℃ for 60min, and then carrying out heat preservation and filtration to obtain full water-soluble potassium magnesium fertilizer particles, wherein the mass ratio of the slurry to fresh water is 1: 0.8;
(4) adding polyvinyl alcohol into water, heating to completely melt, adding chitosan and talcum powder, and uniformly stirring to obtain a coating liquid, wherein the coating liquid comprises 6.5% of polyvinyl alcohol, 1.5% of chitosan, 4.0% of talcum powder and the balance of water by mass;
(5) preheating the fully water-soluble potassium-magnesium fertilizer particles obtained in the step (3) and a coating machine to 80 ℃, spraying the coating liquid obtained in the step (4) on the surfaces of the fully water-soluble potassium-magnesium fertilizer particles by using a spraying device, and drying after coating. Wherein the dosage of the coating liquid is 6.0 percent of the total weight of the uncoated full water-soluble potash magnesium fertilizer particles.
The potash magnesium fertilizer K produced by the process2O content 38.5wt%, water-insoluble matter 0.12 wt%.
In the embodiment, the slow release performance of the fertilizer is evaluated by adopting the simplest method for the dissolution rate in water, and the specific operation steps are as follows: the coated fertilizer is soaked in water at a specific temperature, and the dissolution rate of nutrient elements is measured periodically. The European standards Committee stipulates that the nutrient release rate 25d of the fertilizer in water (25 ℃) is not more than 15 percent; 28d does not exceed 75%; at least 75% is released over the specified time. The K of the potash magnesium fertilizer slow release fertilizer obtained by the process in water (25 ℃) is determined by experimental analysis+、Mg2+And SO4 2-The nutrient release rate 25d is respectively 12%, 14% and 13%; 28d are 65%, 54%, 60%, respectively; 60d were released at 80%, 75%, 90% respectively. The product obtained by the embodiment has better slow release performance.
Example 2
The embodiment adopts a semi-finished product of a potash magnesium fertilizer produced by a certain production enterprise in Qinghai and west Taiwan in China as a raw material, and the main chemical composition of the potash magnesium fertilizer comprises the following components: k+19.02wt%，Mg2+5.92wt%，SO4 2-47.2wt% and a water-insoluble matter content of 2.0 wt%.
(1) Mixing the semi-finished potash-magnesia fertilizer, fresh water and crystallization mother liquor C to obtain a mixture, wherein the chemical composition of the mixture comprises K+ 7.48 wt%，Mg2+ 3.17 wt%，SO4 2-18.19 wt%, and carrying out solid-liquid separation after hot melting for 60min at 100 ℃ to obtain clear high-temperature mother liquor;
wherein the chemical composition of the crystallization mother liquor C comprises: k+ 6.88wt%，Mg2+ 3.15wt%，SO4 2- 16.56wt%，H2O 69.84wt%；
(2) Cooling the clear high-temperature mother liquor to 50 ℃ in vacuum, precipitating crystals, settling and concentrating, separating out supernatant liquid serving as crystallization mother liquor C, returning the crystallization mother liquor C to the step (1), and obtaining a lower turbid part which is slurry with the concentration of 48 wt%;
(3) adding water into the slurry obtained in the step (2), converting at a high temperature of 50 ℃ for 80min, and then filtering at a constant temperature to obtain a water-soluble high-potassium fertilizer, wherein the mass ratio of the slurry to fresh water is 1: 0.9;
(4) adding polyvinyl alcohol into water, heating to completely melt, adding chitosan and talcum powder, and uniformly stirring to obtain a coating liquid, wherein the coating liquid comprises, by mass, 5.5% of polyvinyl alcohol, 2.0% of chitosan, 3.0% of talcum powder and the balance of water;
(5) preheating the fully water-soluble potassium-magnesium fertilizer particles obtained in the step (3) and a coating machine to 60 ℃, spraying the coating liquid obtained in the step (4) on the surfaces of the fully water-soluble potassium-magnesium fertilizer particles by using a spraying device, and drying after coating. Wherein the dosage of the coating liquid is 8.0 percent of the total weight of the uncoated full water-soluble potassium-magnesium fertilizer particles.
The potash magnesium fertilizer K produced by the process2O content 35.4wt%, water-insoluble matter 0.06 wt%.
In the embodiment, the slow release performance of the fertilizer is evaluated by adopting the simplest method for the dissolution rate in water, and the specific operation steps are as follows: the coated fertilizer is soaked in water at a specific temperature, and the dissolution rate of nutrient elements is measured periodically. The European standards Committee stipulates that the nutrient release rate 25d of the fertilizer in water (25 ℃) is not more than 15 percent; 28d does not exceed 75%; at least 75% is released over the specified time. The K of the potash magnesium fertilizer slow release fertilizer obtained by the process in water (25 ℃) is determined by experimental analysis+、Mg2+And SO4 2-The nutrient release rate 25d is respectively 11%, 13% and 15%; 28d 72%, 74%, 68%, respectively; 60d were released at 78%, 90%, 82%, respectively. The product obtained by the embodiment has better slow release performance.
Example 3
The embodiment adopts a semi-finished product of a potash magnesium fertilizer produced by certain production enterprises in east Taiwan of Qinghai China as a raw material, and the main chemical composition of the semi-finished product comprises the following components: k+18.85wt%，Mg2+5.91wt%，SO4 2-47.29wt%, water-insoluble content 2.5 wt%.
(1) Mixing the semi-finished potash magnesium fertilizer, fresh water and crystallization mother liquor C to obtain a mixture, wherein the chemical composition of the mixture comprises: k+7.07 wt%，Mg2+ 3.09 wt%，SO4 2-17.30 wt%, and performing solid-liquid separation after hot melting for 80min at the temperature of 90 ℃ to obtain clear high-temperature mother liquor;
wherein the chemical composition of the crystallization mother liquor C comprises: k+ 6.23wt%，Mg2+3.13wt%，SO4 2- 15.22wt%，H2O 71.39wt%；
(2) Cooling the clear high-temperature mother liquor to 60 ℃ in vacuum, precipitating crystals, settling and concentrating, separating out supernatant liquid serving as crystallization mother liquor C, returning the crystallization mother liquor C to the step (1), and obtaining a lower turbid part which is slurry with the concentration of 42 wt%;
(3) adding water into the slurry obtained in the step (2), converting at a high temperature of 60 ℃ for 90min, and then carrying out heat preservation and filtration to obtain full water-soluble potassium magnesium fertilizer particles, wherein the mass ratio of the slurry to fresh water is 1: 1.2;
(4) adding polyvinyl alcohol into water, heating to completely melt, adding chitosan and talcum powder, and uniformly stirring to obtain a coating liquid, wherein the coating liquid comprises 8.5% of polyvinyl alcohol, 2.0% of chitosan, 4.5% of talcum powder and the balance of water by mass;
(5) preheating the fully water-soluble potassium-magnesium fertilizer particles obtained in the step (3) and a coating machine to 70 ℃, spraying the coating liquid obtained in the step (4) on the surfaces of the fully water-soluble potassium-magnesium fertilizer particles by using a spraying device, and drying after coating. Wherein the dosage of the coating liquid is 5.5 percent of the total weight of the uncoated full water-soluble potassium-magnesium fertilizer particles.
The potash magnesium fertilizer K produced by the process2O content 36.7wt%, water-insoluble matter 0.15 wt%.
In the embodiment, the slow release performance of the fertilizer is evaluated by adopting the simplest method for determining the dissolution rate in water, and the method comprises the following specific operation steps: the coated fertilizer is soaked in water at a specific temperature, and the dissolution rate of nutrient elements is measured periodically. The European standards Committee stipulates that the nutrient release rate 25d of the fertilizer in water (25 ℃) is not more than 15 percent; 28d does not exceed 75%; at least 75% is released over the specified time. The K of the potash magnesium fertilizer slow release fertilizer obtained by the process in water (25 ℃) is determined by experimental analysis+、Mg2+And SO4 2-The nutrient release rate 25d is respectively 12%, 12% and 13%; 28d 64%, 58%, 72% respectively; 60d were 85%, 92%, 78% released, respectively. The product obtained by the embodiment has better slow release performance.
Example 4
The embodiment adopts a semi-finished product of the potash magnesium fertilizer produced by a certain production enterprise in inland of China as a raw material, and the main chemical composition of the semi-finished product comprises the following components: k+18.80wt%，Mg2+5.93wt%，SO4 2-46.83wt%, water-insoluble content 2.9 wt%.
(1) Mixing the semi-finished potash-magnesia fertilizer, fresh water and crystallization mother liquor C,obtaining a mixture, wherein the chemical composition of the mixture comprises K+ 7.07 wt%，Mg2+ 3.09 wt%，SO4 2-17.30 wt%, and performing solid-liquid separation after hot melting for 80min at the temperature of 90 ℃ to obtain clear high-temperature mother liquor;
wherein the chemical composition C of the crystallization mother liquor comprises: k+ 6.28wt%，Mg2+3.37wt%，SO4 2- 14.87wt%，H2O 70.70wt%；
(2) Cooling the clear high-temperature mother liquor to 45 ℃ in vacuum, precipitating crystals, settling and concentrating, separating out supernatant, returning the supernatant as a crystallization mother liquor C to the step (1), and obtaining a lower turbid part which is slurry with the concentration of 53 wt%;
(3) adding water into the slurry obtained in the step (2), converting at a high temperature of 45 ℃ for 70min, and then carrying out heat preservation and filtration to obtain full water-soluble potassium magnesium fertilizer particles, wherein the mass ratio of the slurry to fresh water is 1: 1;
(4) adding polyvinyl alcohol into water, heating to completely melt, adding chitosan and talcum powder, and uniformly stirring to obtain a coating liquid, wherein the coating liquid comprises 8.5% of polyvinyl alcohol, 0.8% of chitosan, 3.2% of talcum powder and the balance of water by mass;
(5) preheating the fully water-soluble potassium-magnesium fertilizer particles obtained in the step (3) and a coating machine to 75 ℃, spraying the coating liquid obtained in the step (4) on the surfaces of the fully water-soluble potassium-magnesium fertilizer particles by using a spraying device, and drying after coating. Wherein the coating liquid is 9.5 percent of the total weight of the uncoated full water-soluble potassium-magnesium fertilizer particles.
The potash magnesium fertilizer K produced by the process2O content 40.3wt%, water-insoluble matter 0.05 wt%.
In the embodiment, the slow release performance of the fertilizer is evaluated by adopting the simplest method for the dissolution rate in water, and the specific operation steps are as follows: the coated fertilizer is soaked in water at a specific temperature, and the dissolution rate of nutrient elements is measured periodically. The European standards Committee stipulates that the nutrient release rate 25d of the fertilizer in water (25 ℃) is not more than 15 percent; 28d does not exceed 75%; at least 75% is released over the specified time. Determined by experimental analysis, obtained by the processK of potassium magnesium fertilizer slow release fertilizer in water (25℃)+、Mg2+And SO4 2-The nutrient release rate 25d is respectively 10%, 8% and 12%; 28d 58%, 74%, 65%, respectively; 60d were 88%, 82%, 95% released, respectively. The product obtained by the embodiment has better slow release performance.
Claims (8)
1. A production process of a full water-soluble potassium-magnesium slow release fertilizer is characterized by comprising the following steps:
(1) mixing the semi-finished potash magnesium fertilizer, fresh water and crystallization mother liquor C to obtain a mixture, and carrying out hot melting and solid-liquid separation to obtain clear high-temperature mother liquor; the chemical composition of the semi-finished potash magnesium fertilizer comprises the following components: k+18.5～19.5wt%，Mg2+5.0～6.5wt%，SO4 2-46.0-48.0 wt%, and the content of water insoluble substances is less than or equal to 3.0 wt%; the chemical composition of the crystallization mother liquor C comprises: k+ 6.0～7.0wt%，Mg2+ 2.5～3.5wt%，SO4 2- 14.5～17.0wt%；
(2) Cooling the clarified high-temperature mother liquor in vacuum, separating out crystals, settling and concentrating, separating out supernatant liquid serving as crystallization mother liquor C, returning the crystallization mother liquor C to the step (1), and taking the lower turbid part as slurry;
(3) adding fresh water into the slurry obtained in the step (2), converting at high temperature, and filtering at a heat preservation state to obtain fully water-soluble potassium-magnesium fertilizer particles;
(4) adding polyvinyl alcohol into water, heating to completely melt, adding chitosan and talcum powder, and stirring uniformly to obtain a coating liquid;
(5) preheating the fully water-soluble potassium-magnesium fertilizer particles obtained in the step (3) in a coating machine, spraying the coating liquid obtained in the step (4) on the surfaces of the fully water-soluble potassium-magnesium fertilizer particles for coating, and drying to obtain the finished product;
in the step (1), the temperature of the hot melting is 90-110 ℃, and the time of the hot melting is 60-90 min;
in the step (2), the vacuum cooling is to cool the mixture to 40-60 ℃;
in the step (3), the temperature of high-temperature conversion is 40-60 ℃, and the time of high-temperature conversion is 60-90 min;
in the step (4), the mass ratio of the raw materials for preparing the coating liquid is as follows: 5-10% of polyvinyl alcohol, 0.8-2.0% of chitosan, 3.0-5.0% of talcum powder and the balance of water;
in the step (5), preheating is carried out until the temperature is 60-80 ℃.
2. The production process of the fully water-soluble potassium-magnesium slow release fertilizer as claimed in claim 1, wherein in the step (1), the chemical composition of the mixture comprises: k+ 6.5～8.0 wt%，Mg2+ 2.5～4.0 wt%，SO4 2- 16.5～20.0 wt%。
3. The production process of the full water-soluble potassium-magnesium slow release fertilizer as claimed in claim 1 or 2, wherein in the step (2), the concentration of the slurry is 40-60 wt%.
4. The production process of the full water-soluble potassium-magnesium slow release fertilizer according to claim 1 or 2, wherein in the step (3), the mass ratio of the slurry to the fresh water is 1: 0.6-1.2.
5. The production process of the full water-soluble potassium-magnesium slow release fertilizer as claimed in claim 3, wherein in the step (3), the mass ratio of the slurry to the fresh water is 1: 0.6-1.2.
6. The production process of the fully water-soluble potassium-magnesium slow-release fertilizer according to claim 1 or 2, wherein in the step (5), the amount of the coating liquid is 5-10% of the total weight of the non-coated fully water-soluble potassium-magnesium fertilizer particles.
7. The production process of the fully water-soluble potassium-magnesium slow-release fertilizer according to claim 3, wherein in the step (5), the amount of the coating liquid is 5-10% of the total weight of the non-coated fully water-soluble potassium-magnesium fertilizer particles.
8. The production process of the fully water-soluble potassium-magnesium slow-release fertilizer as claimed in claim 4, wherein in the step (5), the amount of the coating liquid is 5-10% of the total weight of the non-coated fully water-soluble potassium-magnesium fertilizer particles.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102001887A (en) * | 2010-11-23 | 2011-04-06 | 中盐安徽红四方股份有限公司 | Efficient environmental-friendly slow-release fertilizer and preparation method thereof |
| CN107382381A (en) * | 2017-08-31 | 2017-11-24 | 化工部长沙设计研究院 | A kind of production technology of high-quality potash magnesium sulphate fertilizer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102001887A (en) * | 2010-11-23 | 2011-04-06 | 中盐安徽红四方股份有限公司 | Efficient environmental-friendly slow-release fertilizer and preparation method thereof |
| CN107382381A (en) * | 2017-08-31 | 2017-11-24 | 化工部长沙设计研究院 | A kind of production technology of high-quality potash magnesium sulphate fertilizer |
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