WO2019015067A1 - Method of preparing moisture-proof urea specifically for blended fertilizer - Google Patents

Method of preparing moisture-proof urea specifically for blended fertilizer Download PDF

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Publication number
WO2019015067A1
WO2019015067A1 PCT/CN2017/102066 CN2017102066W WO2019015067A1 WO 2019015067 A1 WO2019015067 A1 WO 2019015067A1 CN 2017102066 W CN2017102066 W CN 2017102066W WO 2019015067 A1 WO2019015067 A1 WO 2019015067A1
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urea
moisture
proof
fertilizer
magnesium oxide
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PCT/CN2017/102066
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French (fr)
Chinese (zh)
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王仁宗
操素芬
刘裕
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湖北富邦科技股份有限公司
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Priority to MA47625A priority Critical patent/MA47625B1/en
Publication of WO2019015067A1 publication Critical patent/WO2019015067A1/en

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    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
    • C05D9/00—Other inorganic fertilisers
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • 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
    • C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • 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
    • C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
    • C05G3/90—Mixtures of one or more fertilisers with additives not having a specially fertilising activity for affecting the nitrification of ammonium compounds or urea in the soil

Definitions

  • This invention relates to the field of blended fertilizer manufacture. It is mainly a preparation method of special moisture-proof urea for blending fertilizer.
  • China is a big agricultural country, and various fertilizers, especially fertilizers, play an indelible contribution to China's food security.
  • the acidic character of calcium is that it cannot be contacted with urea, because the residual sulfuric acid in the calcium will react with urea to form urea sulfate, which is liquid, which causes farmers to use common calcium as a phosphorus source and urea and potassium fertilizer to prepare.
  • urea sulfate which is liquid, which causes farmers to use common calcium as a phosphorus source and urea and potassium fertilizer to prepare.
  • the fertilizer becomes wet and becomes agglomerated and cannot be fertilized.
  • the invention provides a preparation method of special moisture-proof urea for blending fertilizer, wherein the urea obtained by the method can be stably mixed with an acidic fertilizer such as calcium phosphate, does not absorb moisture, does not change tide, and greatly broadens the blending fertilizer.
  • an acidic fertilizer such as calcium phosphate
  • the invention discloses a preparation method of special moisture-proof urea for blending fertilizer, which is characterized in that: granular urea is input into a front end of a coating drum, a disc or a mixer having a mixing function, and a special moisture-proof agent is sprayed on the surface of the granular urea; In the rear end of the coating drum, in the disc or in the mixer with mixing function, a layer of modified magnesium oxide powder is sprayed to prepare a special moisture-proof urea for the blending fertilizer.
  • the granular urea is one or a mixture of two or more of granular urea prepared by a high tower, granular urea prepared by a drum apparatus, granular urea prepared by fluidized bed granulation, and granular urea prepared by an extrusion process.
  • the special moisture-proofing agent is HISOFT FA 130 of Hubei Fubon Technology Co., Ltd., which is composed of 10-30% dextrin, 5-50% polyethylene glycol 4000 and 30-80% by weight. a mixture of water.
  • the modified magnesium oxide powder is prepared by uniformly mixing the original magnesia powder with a mixture of one or more of paraffin wax, vegetable oil or mineral oil having a mass of 0.5-10% by mass of magnesium oxide, and grinding to 200-2000 mesh, that is, the modified magnesium oxide powder is obtained.
  • the wax has a melting point of 20 ° C - 120 ° C.
  • the urea granules obtained by the method are loose, and no additional fertilizer anti-caking agent is needed;
  • the two-layer high-efficiency moisture-proof isolation treatment can completely avoid the contact of urea with calcium or other fertilizer medium with high water content to achieve the ideal isolation effect.
  • urea-coated drum On the front end of the urea-coated drum, 1 kg of urea granules were sprayed with 0.5 kg of HISOFT FA 130 produced by Hubei Fubon Technology Co., Ltd. (20% dextrin, 20% polyethylene glycol 4000 by weight percent) a mixture with 60% water). At the rear end of the coating drum, 10 kg of the prepared modified magnesium oxide powder is sprayed to obtain a special moisture-proof urea for the blended fertilizer.
  • the modified magnesium oxide powder formula: the original magnesium oxide powder, and the total amount of the original magnesium oxide powder A 5% amount of paraffin wax having a melting point of 60 ° C was ground to a mesh size of 600 mesh.
  • the mass ratio of calcium perphosphate is 1:1, and it is placed for 5 minutes.
  • the fertilizer mixture precipitates a large amount of water, the material becomes damp and viscous, and the fertilizer eventually agglomerates and becomes a whole piece.
  • the mass ratio of calcium perphosphate is 1:1, and it is placed for 5 minutes.
  • the fertilizer mixture precipitates a large amount of water, the material becomes damp and viscous, and the fertilizer eventually agglomerates and becomes a whole piece.
  • the modified magnesium oxide powder formula: the original powder of magnesia, the mixture of 3% of the total amount of the original magnesia powder, the paraffin wax having a melting point of 70 ° C: soybean vegetable oil: mineral oil (carbon chain in C16-C35 The mineral oil is prepared in a ratio of 1:1:1, and is ground and modified to a mesh size of 200 mesh.
  • the mass ratio of calcium perphosphate is 1:1, and it is placed for 5 minutes.
  • the fertilizer mixture precipitates a large amount of water, the material becomes damp and viscous, and the fertilizer eventually agglomerates and becomes a whole piece.
  • the modified magnesium oxide powder formula: magnesium oxide raw powder, adding 10% of the total amount of the original magnesium oxide powder, soybean vegetable oil: mineral oil (carbon chain in C16-C35 mineral oil) according to 1:1 The proportion is adjusted from time to time, and the modification is carried out until the powder has a mesh number of 1000 mesh.
  • the mass ratio of calcium perphosphate is 1:1, and it is completely loose after being left for 5 months;
  • the mass ratio of calcium perphosphate is 1:1, and it is placed for 5 minutes.
  • the fertilizer mixture precipitates a large amount of water, the material becomes damp and viscous, and the fertilizer eventually agglomerates and becomes a whole piece.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Organic Chemistry (AREA)
  • Pest Control & Pesticides (AREA)
  • Soil Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Fertilizers (AREA)

Abstract

A method of preparing moisture-proof urea specifically for a blended fertilizer, characterized by: adding granular urea into a front end of a coating drum, a disc, or a mixer having a mixing function and spray coating the granular urea with a layer of a dedicated moisture-proof agent; and spray coating the granular urea with a layer of modified magnesium oxide powder in a rear end of the coating drum, the disc, or the mixer having a mixing function to obtain the moisture-proof urea specifically for a blended fertilizer. The urea prepared by the method can be stably mixed with an acidic fertilizer such as calcium superphosphate without absorbing moisture, becoming moist, or caking.

Description

一种掺混肥专用防潮型尿素的制备方法Preparation method of special moisture-proof urea for blending fertilizer 技术领域Technical field
本发明涉及掺混肥制造领域。主要是一种掺混肥专用防潮型尿素的制备方法。This invention relates to the field of blended fertilizer manufacture. It is mainly a preparation method of special moisture-proof urea for blending fertilizer.
背景技术Background technique
中国是一个农业大国，各种肥料，尤其是化肥对我国粮食安全发挥不可磨灭的贡献。China is a big agricultural country, and various fertilizers, especially fertilizers, play an indelible contribution to China's food security.
粮食的需求带动中国化肥的爆发式增长，过去十年，中国各类化肥企业多达6000多家，多为复合肥料企业，他们将颗粒尿素，磷铵，氯化钾或硫酸钾，进行破碎处理后再次用蒸汽转鼓造粒，或者是熔融后高塔造粒，对于肥料养分贡献为零。与我们中国肥料模式截然不同的美国，则是以掺混肥为主，掺混肥就是将颗粒尿素，颗粒磷铵和颗粒钾肥物理混合而成，省去了复合肥的二次加工，因此掺混肥(也称BB肥)更加低碳和经济。The demand for food has driven the explosive growth of China's chemical fertilizers. Over the past decade, there have been more than 6,000 types of chemical fertilizer companies in China, mostly compound fertilizer companies, which have crushed granular urea, ammonium phosphate, potassium chloride or potassium sulfate. After that, it is again granulated by steam drum, or it is granulated by high tower after melting, and contributes zero to fertilizer nutrients. In the United States, which is completely different from our Chinese fertilizer model, it is based on blended fertilizer. The blended fertilizer is a combination of granular urea, granular ammonium phosphate and granular potassium fertilizer. It eliminates the secondary processing of compound fertilizer, so it is blended. Mixed fertilizer (also known as BB fertilizer) is much lower carbon and economical.
近几年来，我国东北地区也慢慢开始施用掺混肥，农户购买各种单质肥料，常见氮肥如:颗粒尿素，常用的磷肥如：高浓度的颗粒磷酸二铵、颗粒磷酸一铵、以及富含磷和钙、镁、硫等中微量元素普钙和重钙，常用的钾肥就是颗粒氯化钾、硫酸钾。在这些肥料中，普钙是一种性价比高的磷肥，其价格较磷酸一铵和磷酸二铵低很多且中微量元素营养更全面，因为普钙的生产是用硫酸和磷矿粉直接反应制得，它是一种偏酸性的肥料，在提供磷养分同时，将磷矿粉中各种金属微量元素和中量元素全部保留了下来，加上普钙的偏酸性，也可以促进土壤中被固定的营养元素重新被作物利用，因此使用普钙的作物长势更加好，也深受农民认可。In recent years, the northeastern region of China has gradually begun to apply blended fertilizers. Farmers purchase various simple fertilizers. Common nitrogen fertilizers such as granular urea, commonly used phosphate fertilizers such as: high concentration of granular diammonium phosphate, granular monoammonium phosphate, and rich Phosphorus and calcium, magnesium, sulfur and other trace elements of calcium and heavy calcium, commonly used potassium fertilizer is granular potassium chloride, potassium sulfate. Among these fertilizers, calcium is a cost-effective phosphate fertilizer, its price is much lower than that of monoammonium phosphate and diammonium phosphate, and the medium and trace elements are more comprehensive, because the production of calcium is directly reacted with sulfuric acid and phosphate rock. It is a kind of acidic fertilizer. While providing phosphorus nutrients, all the trace elements and medium elements of various metals in the phosphate rock are retained. Together with the acidity of calcium, it can also promote the soil. Fixed nutrients are re-used by crops, so the use of calcium-producing crops is growing better and is recognized by farmers.
但是普钙的酸性特征，造成它不能与尿素接触，因为普钙中残留的硫酸会与尿素反应形成硫酸脲，呈液体状，也就造成农民在用普钙作为磷源和尿素，钾肥混合制备掺混肥时，出现肥料变湿，成团，无法施肥的问题。However, the acidic character of calcium is that it cannot be contacted with urea, because the residual sulfuric acid in the calcium will react with urea to form urea sulfate, which is liquid, which causes farmers to use common calcium as a phosphorus source and urea and potassium fertilizer to prepare. When the fertilizer is blended, there is a problem that the fertilizer becomes wet and becomes agglomerated and cannot be fertilized.
因为这一问题，在一定程度上也制约了掺混肥的发展。Because of this problem, it also restricts the development of blended fertilizer to a certain extent.
因此，在这样的背景下，制备一种以普钙和尿素为原料的掺混肥专用型尿素，成为当务之急。Therefore, in this context, it is imperative to prepare a urea for blending fertilizers using calcium and urea as raw materials.
发明内容 Summary of the invention
本发明在于提供一种掺混肥专用防潮型尿素的制备方法，该方法制得的尿素可以与普钙等酸性肥料进行稳定混合，不吸潮，不变潮，极大地拓宽了掺混肥的原料肥种类。The invention provides a preparation method of special moisture-proof urea for blending fertilizer, wherein the urea obtained by the method can be stably mixed with an acidic fertilizer such as calcium phosphate, does not absorb moisture, does not change tide, and greatly broadens the blending fertilizer. The type of raw material fertilizer.
一种掺混肥专用防潮型尿素的制备方法，其特征在于：在包膜滚筒前端、圆盘里或具有混合功能的混合器里投入颗粒尿素，在颗粒尿素表面喷涂一层专用防潮剂；随后在包膜滚筒后端、圆盘里或是具有混合功能的混合器里，再喷涂一层改性氧化镁粉末，即制得掺混肥专用防潮型尿素。The invention discloses a preparation method of special moisture-proof urea for blending fertilizer, which is characterized in that: granular urea is input into a front end of a coating drum, a disc or a mixer having a mixing function, and a special moisture-proof agent is sprayed on the surface of the granular urea; In the rear end of the coating drum, in the disc or in the mixer with mixing function, a layer of modified magnesium oxide powder is sprayed to prepare a special moisture-proof urea for the blending fertilizer.
所述的颗粒尿素为高塔制备的颗粒尿素、转鼓设备制备的颗粒尿素、流化床造粒制备的颗粒尿素、挤压法工艺制备的颗粒尿素中的一种或二种以上的混合物。The granular urea is one or a mixture of two or more of granular urea prepared by a high tower, granular urea prepared by a drum apparatus, granular urea prepared by fluidized bed granulation, and granular urea prepared by an extrusion process.
所述的专用防潮剂为湖北富邦科技股份有限公司的产品HISOFT FA 130，按重量百分比计，成分为10—30％的糊精，5—50％的聚乙二醇4000和30—80％的水的混合物。The special moisture-proofing agent is HISOFT FA 130 of Hubei Fubon Technology Co., Ltd., which is composed of 10-30% dextrin, 5-50% polyethylene glycol 4000 and 30-80% by weight. a mixture of water.
所述的改性氧化镁粉末的制备方法为：将氧化镁原粉与质量为氧化镁质量0.5—10％的石蜡、植物油或矿物油中的一种或二种以上的混合物混合均匀，研磨至200—2000目，即制得改性氧化镁粉体。The modified magnesium oxide powder is prepared by uniformly mixing the original magnesia powder with a mixture of one or more of paraffin wax, vegetable oil or mineral oil having a mass of 0.5-10% by mass of magnesium oxide, and grinding to 200-2000 mesh, that is, the modified magnesium oxide powder is obtained.
所述的石蜡的熔点为20℃—120℃。The wax has a melting point of 20 ° C - 120 ° C.
本发明的优点在于：The advantages of the invention are:
1、简单快速。在现有肥料包裹滚筒内喷涂即可实现掺混肥专用防潮型尿素的制备；1, simple and fast. The preparation of special moisture-proof urea for blending fertilizer can be realized by spraying in the existing fertilizer wrapping drum;
2、无返料。包裹完毕后直接进入包装储存系统；2, no return material. After the package is completed, directly enter the packaging and storage system;
3、兼具有防结功能。该方法制得的尿素颗粒松散，不再需要额外添加肥料防结块剂；3, also has anti-knot function. The urea granules obtained by the method are loose, and no additional fertilizer anti-caking agent is needed;
4、高效防潮隔离。两层高效的防潮隔离处理，能完全避免尿素与普钙或其他含水量高的肥料介质接触，实现理想的隔离效果。4, efficient moisture isolation. The two-layer high-efficiency moisture-proof isolation treatment can completely avoid the contact of urea with calcium or other fertilizer medium with high water content to achieve the ideal isolation effect.
具体实施方式Detailed ways
下面结合实施例对本发明作进一步描述。具体实施方式如下。The invention is further described below in conjunction with the embodiments. The specific embodiment is as follows.
实施案例1Implementation case 1
在尿素包裹滚筒前端，1吨尿素颗粒上，喷涂0.5公斤的湖北富邦科技股份有限公司生产的HISOFT FA 130(按重量百分比计，成分为20％的糊精，20％的聚乙二醇4000和60％水的混合物)。在包膜滚筒后端，喷涂10公斤的制备好的改性氧化镁粉，即得到掺混肥专用防潮型尿素。所述的改性氧化镁粉体配方：氧化镁原粉，加占氧化镁原粉总 量5％的60℃熔点的石蜡研磨，至粉体目数为600目。On the front end of the urea-coated drum, 1 kg of urea granules were sprayed with 0.5 kg of HISOFT FA 130 produced by Hubei Fubon Technology Co., Ltd. (20% dextrin, 20% polyethylene glycol 4000 by weight percent) a mixture with 60% water). At the rear end of the coating drum, 10 kg of the prepared modified magnesium oxide powder is sprayed to obtain a special moisture-proof urea for the blended fertilizer. The modified magnesium oxide powder formula: the original magnesium oxide powder, and the total amount of the original magnesium oxide powder A 5% amount of paraffin wax having a melting point of 60 ° C was ground to a mesh size of 600 mesh.
经上述处理的尿素，普过磷酸钙质量比1:1，放置3个月完全松散；After the above treatment of urea, the mass ratio of calcium perphosphate is 1:1, and it is completely loose after being left for 3 months;
没有经过上述处理的尿素，普过磷酸钙质量比1:1，放置5分钟，肥料混合物析出大量水分，物料变潮湿，粘稠，肥料最终结块，呈现变成一整块。Urea without the above treatment, the mass ratio of calcium perphosphate is 1:1, and it is placed for 5 minutes. The fertilizer mixture precipitates a large amount of water, the material becomes damp and viscous, and the fertilizer eventually agglomerates and becomes a whole piece.
实施案例2Implementation case 2
在圆盘内，在1吨尿素颗粒上，喷涂1公斤的湖北富邦科技股份有限公司生产的HISOFT FA 130(按重量百分比计，成分为10％的糊精，30％的聚乙二醇4000和60％的水的混合物)，在圆盘内，再喷涂30公斤的制备好的改性氧化镁粉，即得到掺混肥专用防潮型尿素。所述的改性氧化镁粉体配方：氧化镁原粉，加占氧化镁原粉总量3％的大豆植物油研磨，至粉体目数为500目。In the disc, spray 1 kg of HISOFT FA 130 produced by Hubei Fubon Technology Co., Ltd. on a 1 ton urea granule (10% dextrin, 30% PEG 4000 by weight percent) And a mixture of 60% water), in the disc, spray 30 kg of the prepared modified magnesium oxide powder, that is, a special moisture-proof urea for blending fertilizer is obtained. The modified magnesium oxide powder formula: the original magnesia powder, and the soybean vegetable oil added to the total amount of 3% of the original magnesia powder is ground to a powder order of 500 mesh.
经上述处理的尿素，普过磷酸钙质量比1:1，放置4个月完全松散；After the above treatment of urea, the mass ratio of calcium perphosphate is 1:1, and it is completely loose after being left for 4 months;
没有经过上述处理的尿素，普过磷酸钙质量比1:1，放置5分钟，肥料混合物析出大量水分，物料变潮湿，粘稠，肥料最终结块，呈现变成一整块。Urea without the above treatment, the mass ratio of calcium perphosphate is 1:1, and it is placed for 5 minutes. The fertilizer mixture precipitates a large amount of water, the material becomes damp and viscous, and the fertilizer eventually agglomerates and becomes a whole piece.
实施案例3Implementation case 3
在圆盘内，在1吨尿素颗粒上，喷涂1公斤的湖北富邦科技股份有限公司生产的HISOFT FA 130(按重量百分比计，成分为30％的糊精，5％的聚乙二醇4000和65％水的混合物)，在圆盘内，再喷涂30公斤的制备好的改性氧化镁粉，即得到掺混肥专用防潮型尿素。所述的改性氧化镁粉体配方：氧化镁原粉，加占氧化镁原粉总量3％的混合剂，熔点为70℃的石蜡：大豆植物油：矿物油(碳链在C16-C35的矿物油)按1:1:1的比例调制而时成，研磨改性，至粉体目数为200目。In the disc, spray 1 kg of HISOFT FA 130 produced by Hubei Fubon Technology Co., Ltd. on a 1 ton urea granule (30% by weight of dextrin, 5% of polyethylene glycol 4000) And a mixture of 65% water), in the disc, spray 30 kg of the prepared modified magnesium oxide powder to obtain a special moisture-proof urea for blending fertilizer. The modified magnesium oxide powder formula: the original powder of magnesia, the mixture of 3% of the total amount of the original magnesia powder, the paraffin wax having a melting point of 70 ° C: soybean vegetable oil: mineral oil (carbon chain in C16-C35 The mineral oil is prepared in a ratio of 1:1:1, and is ground and modified to a mesh size of 200 mesh.
经上述处理的尿素，普过磷酸钙质量比1:1，放置3个月完全松散；After the above treatment of urea, the mass ratio of calcium perphosphate is 1:1, and it is completely loose after being left for 3 months;
没有经过上述处理的尿素，普过磷酸钙质量比1:1，放置5分钟，肥料混合物析出大量水分，物料变潮湿，粘稠，肥料最终结块，呈现变成一整块。Urea without the above treatment, the mass ratio of calcium perphosphate is 1:1, and it is placed for 5 minutes. The fertilizer mixture precipitates a large amount of water, the material becomes damp and viscous, and the fertilizer eventually agglomerates and becomes a whole piece.
实施案例4Implementation case 4
在混合器内，在1吨尿素颗粒上，喷涂1公斤的湖北富邦科技股份有限公司生产的HISOFT FA 130(按重量百分比计，成分为10％的糊精，50％的聚乙二醇4000和40％的水的混合物)，在混合器内，再喷涂30公斤的制备好的改性氧化镁粉，即得到掺混肥 专用防潮型尿素。所述的改性氧化镁粉体配方：氧化镁原粉，加占氧化镁原粉总量10％的混合剂，大豆植物油：矿物油(碳链在C16-C35的矿物油)按1:1的比例调制而时成，研磨改性，至粉体目数为1000目。In the mixer, spray 1 kg of HISOFT FA 130 produced by Hubei Fubon Technology Co., Ltd. on a 1 ton urea granule (10% dextrin, 50% polyethylene glycol 4000 by weight percent) And 40% water mixture), in the mixer, spray 30 kg of the prepared modified magnesium oxide powder to obtain the blended fertilizer Special moisture-proof urea. The modified magnesium oxide powder formula: magnesium oxide raw powder, adding 10% of the total amount of the original magnesium oxide powder, soybean vegetable oil: mineral oil (carbon chain in C16-C35 mineral oil) according to 1:1 The proportion is adjusted from time to time, and the modification is carried out until the powder has a mesh number of 1000 mesh.
经上述处理的尿素，普过磷酸钙质量比1:1，放置5个月完全松散；After the above treatment of urea, the mass ratio of calcium perphosphate is 1:1, and it is completely loose after being left for 5 months;
没有经过上述处理的尿素，普过磷酸钙质量比1:1，放置5分钟，肥料混合物析出大量水分，物料变潮湿，粘稠，肥料最终结块，呈现变成一整块。 Urea without the above treatment, the mass ratio of calcium perphosphate is 1:1, and it is placed for 5 minutes. The fertilizer mixture precipitates a large amount of water, the material becomes damp and viscous, and the fertilizer eventually agglomerates and becomes a whole piece.

Claims (5)

  1. 一种掺混肥专用防潮型尿素的制备方法，其特征在于：在包膜滚筒前端、圆盘里或具有混合功能的混合器里投入颗粒尿素，在颗粒尿素表面喷涂一层专用防潮剂；随后在包膜滚筒后端、圆盘里或是具有混合功能的混合器里，再喷涂一层改性氧化镁粉末，即制得掺混肥专用防潮型尿素。The invention discloses a preparation method of special moisture-proof urea for blending fertilizer, which is characterized in that: granular urea is input into a front end of a coating drum, a disc or a mixer having a mixing function, and a special moisture-proof agent is sprayed on the surface of the granular urea; In the rear end of the coating drum, in the disc or in the mixer with mixing function, a layer of modified magnesium oxide powder is sprayed to prepare a special moisture-proof urea for the blending fertilizer.
  2. 如权利要求1所述的一种掺混肥专用防潮型尿素的制备方法，其特征在于：所述的颗粒尿素为高塔制备的颗粒尿素、转鼓设备制备的颗粒尿素、流化床造粒制备的颗粒尿素、挤压法工艺制备的颗粒尿素中的一种或二种以上的混合物。The method for preparing a moisture-proof urea for blending fertilizer according to claim 1, wherein the granular urea is granular urea prepared by a high tower, granular urea prepared by a drum device, and fluidized bed granulation. One or a mixture of two or more of the prepared granular urea and the granular urea prepared by the extrusion process.
  3. 如权利要求1所述的一种掺混肥专用防潮型尿素的制备方法，其特征在于：所述的专用防潮剂为湖北富邦科技股份有限公司的产品HISOFT FA 130，按重量百分比计，成分为10—30％的糊精、5—50％的聚乙二醇4000和30—80％的水的混合物。The method for preparing moisture-proof urea for blending fertilizer according to claim 1, wherein the special moisture-proofing agent is HISOFT FA 130 of Hubei Fubon Technology Co., Ltd., in terms of percentage by weight, composition It is a mixture of 10-30% dextrin, 5-50% polyethylene glycol 4000 and 30-80% water.
  4. 如权利要求1所述的一种掺混肥专用防潮型尿素的制备方法，其特征在于：所述的改性氧化镁粉末的制备方法为：将氧化镁原粉与质量为氧化镁质量0.5—10％的石蜡、植物油或矿物油中的一种或二种以上的混合物混合均匀，研磨至200—2000目，即制得改性氧化镁粉体。The method for preparing a moisture-proof type urea for blending fertilizer according to claim 1, wherein the modified magnesium oxide powder is prepared by: massing the original magnesium oxide powder with a mass of 0.5 by mass of magnesium oxide. One or more of 10% of paraffin, vegetable oil or mineral oil is uniformly mixed and ground to 200-2000 mesh to obtain a modified magnesium oxide powder.
  5. 如权利要求4所述的一种掺混肥专用防潮型尿素的制备方法，其特征在于：所述的石蜡的熔点为20℃—120℃。 The method for preparing a moisture-proof urea for blending fertilizer according to claim 4, wherein the paraffin has a melting point of 20 ° C - 120 ° C.
PCT/CN2017/102066 2017-07-18 2017-09-18 Method of preparing moisture-proof urea specifically for blended fertilizer WO2019015067A1 (en)

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