WO2019047267A1 - 阻隔颗粒过磷酸盐与颗粒尿素接触的方法 - Google Patents

阻隔颗粒过磷酸盐与颗粒尿素接触的方法 Download PDF

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WO2019047267A1
WO2019047267A1 PCT/CN2017/102225 CN2017102225W WO2019047267A1 WO 2019047267 A1 WO2019047267 A1 WO 2019047267A1 CN 2017102225 W CN2017102225 W CN 2017102225W WO 2019047267 A1 WO2019047267 A1 WO 2019047267A1
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particulate
perphosphate
superphosphate
urea
barrier
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PCT/CN2017/102225
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English (en)
French (fr)
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操素芬
王应宗
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湖北富邦科技股份有限公司
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Priority to MA47627A priority Critical patent/MA47627B1/fr
Publication of WO2019047267A1 publication Critical patent/WO2019047267A1/zh

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    • 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
    • C05G3/30—Anti-agglomerating additives; Anti-solidifying additives
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05B—PHOSPHATIC FERTILISERS
    • C05B1/00—Superphosphates, i.e. fertilisers produced by reacting rock or bone phosphates with sulfuric or phosphoric acid in such amounts and concentrations as to yield solid products directly
    • C05B1/02—Superphosphates
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05B—PHOSPHATIC FERTILISERS
    • C05B1/00—Superphosphates, i.e. fertilisers produced by reacting rock or bone phosphates with sulfuric or phosphoric acid in such amounts and concentrations as to yield solid products directly
    • C05B1/04—Double-superphosphate; Triple-superphosphate; Other fertilisers based essentially on monocalcium phosphate
    • 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
    • C05G3/20—Mixtures of one or more fertilisers with additives not having a specially fertilising activity for preventing the fertilisers being reduced to powder; Anti-dusting additives
    • 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
    • C05G5/00—Fertilisers characterised by their form
    • C05G5/30—Layered or coated, e.g. dust-preventing coatings

Definitions

  • This invention relates to the field of blended fertilizer manufacture. Mainly a method of blocking the contact of particulate perphosphate with granular urea.
  • China is a big agricultural country, and various fertilizers, especially fertilizers, play an indelible contribution to China's food security.
  • perphosphate is a cost-effective phosphate fertilizer. The production of perphosphate is to decompose phosphate rock with sulfuric acid, phosphoric acid or nitric acid.
  • the decomposed pulp is aged and granulated into particles of superphosphate and phosphorus.
  • the medium amount of elements in the ore such as calcium, magnesium and silicon, and trace elements such as iron, manganese and zinc, remain in the superphosphate.
  • the phosphate has a better effect; in order to ensure decomposition, the inorganic acid is often intentionally controlled.
  • the fertilizer contains a small amount of free inorganic acid, and this kind of inorganic acid can promote the reuse of the fixed nutrients in the soil, so the use of granular phosphate crops is better, and is also recognized by farmers.
  • the particulate perphosphate free acid due to the presence of the particulate perphosphate free acid, it cannot be contacted with urea.
  • the residual inorganic acid in the perphosphate reacts with urea to form urea phosphate and urea sulfate, while urea sulfate and urea phosphate have lower moisture absorption points. It is easy to absorb moisture in the air, and even liquefaction and muddy.
  • the particulate perphosphate is used as a phosphorus source and mixed with urea and potassium fertilizer to prepare a blended fertilizer, the prepared fertilizer is easily wetted, muddy, agglomerated, agglomerated, and cannot be used normally.
  • the invention provides a method for contacting the particulate superphosphate with the granular urea.
  • the granular phosphate treated by the method can be stably mixed by urea, and the product after mixing does not absorb moisture, is not muddy, does not agglomerate, and is thoroughly Solving the problem of blending urea and perphosphate, and promoting the development of the blended fertilizer industry.
  • a method for blocking contact of particulate perphosphate with particulate urea characterized in that the following steps are carried out: input of particulate perphosphate in the front end of the coating drum, in a disc or in a mixer having a mixing function, in the particulate perphosphate The surface is sprayed with a spacer of 0.01-5% of the total amount of particulate perphosphate; then in the rear end of the coating drum, in the disc or in a mixer with mixing function, the total amount of particulate perphosphate is 0.05-20 The % powder is thoroughly mixed to form a tight barrier layer on the surface of the perphosphate of the particles.
  • the particulate perphosphate is a mixture of particulate superphosphate, calcium superphosphate, heavy superphosphate or/and several particulate perphosphates described above.
  • the barrier agent is starch, dextrin, modified starch, starch and acrylic acid copolymer, starch and calcium lignosulfonate copolymer, polyvinyl alcohol, calcium lignosulfonate and polyvinyl alcohol copolymer, polyethylene A solution of one of alcohol, polypropylene glycol, polyethylene glycol and calcium lignosulfonate, calcium lignosulfonate, humic acid and humate or a mixture of two or more.
  • the barrier agent has strong bonding performance and can effectively absorb or fix the fine powder; after the barrier agent is dried, a film is formed to have a certain moisture-proof function.
  • the powder is a powder containing a medium trace element and/or an inert powder.
  • the medium and trace elements are specifically:
  • sulfur-containing substances sulfur, natural gypsum, phosphogypsum, hemihydrate gypsum, anhydrite, magnesium sulfate, potassium sulfate, potassium magnesium sulfate, ammonium sulfate, zinc sulfate, and/or copper sulfate;
  • inorganic salts containing iron, manganese, boron, zinc, copper, molybdenum, silicon and/or selenium including inorganic salts containing iron, manganese, boron, zinc, copper, molybdenum, silicon and/or selenium;
  • the inert powder is one or more of kaolin, talc, attapulgite, bentonite, gypsum, etc. mixture.
  • the powder has a mesh number of 100-2000 mesh.
  • the barrier-treated particulate perphosphate and particulate urea are blended in any ratio to achieve effective barrier. .
  • the treated particulate perphosphate also has an anti-knot function.
  • the granule superphosphate particles prepared by the method are loose, and no additional anti-caking and anti-dusting agents are needed;
  • the composition of the barrier agent is: 20% dextrin, 20% calcium lignin sulfonate, 60% water mixture; at the back end of the coating drum 10 kg of the prepared medium and trace element powder was added, and the film was loosened to the particles without obvious dust, that is, the isolated granular phosphate was obtained.
  • the medium trace element powder formula 50% magnesium oxide, 10% copper oxide, 40% zinc sulfate, and the powder mesh number is 800 mesh.
  • the above-treated granule superphosphate is blended with granular urea by mass 1:1 and left completely loose for 3 months;
  • the particulate superphosphate without the above treatment has a mass ratio of 1:1 to the granular urea for 5 minutes, the fertilizer mixture begins to precipitate moisture, the material becomes moist, viscous, and the fertilizer eventually agglomerates and becomes a whole piece.
  • a barrier agent was sprayed on 1 ton of heavy superphosphate particles, and the barrier composition was: 10% humic acid, 30% starch and acrylic acid copolymer, 60% water mixture.
  • the medium and trace element powder 80% calcium sulfate, 10% boric acid, 10% manganese sulfate, and the powder mesh number is 300 mesh.
  • the granules treated by the above treatment were superphosphate, mixed with the granule urea mass ratio of 1:1, and completely loosened after being left for 4 months;
  • the super-superphosphate without the above treatment was blended with the urea mass ratio of 1:1, and left for 10 minutes, the fertilizer mixture began to precipitate moisture, the material became wet and muddy, and the fertilizer eventually agglomerated and appeared to become a whole piece.
  • a barrier agent in a disc, spray 10 kg of a barrier agent on 1 ton of calcium superphosphate-rich particles.
  • the composition of the barrier agent is: 30% humic acid, 10% polyvinyl alcohol 3000, 60% water mixture,
  • the medium and trace element powder formula: 70% talc powder, 10% copper sulfate, 10% sulfur, 10% manganese sulfate, and the powder mesh number is 300 mesh.
  • the particles treated by the above are rich in superphosphate, mixed with urea at a mass ratio of 1:1, and left completely loose for 3 months;
  • a barrier agent was sprayed on 1 ton of heavy superphosphate particles, and the composition of the barrier was: a mixture of 10% sodium humate, 40% modified starch, and 50% water.
  • the medium and trace element powder formula: 80% calcium sulfate, 10% boric acid, 10% manganese sulfate, and the powder mesh number is 1000 mesh.
  • the granules treated by the above treatment were superphosphate, mixed with the granule urea mass ratio of 1:1, and completely loosened after being left for 4 months;
  • the super-superphosphate without the above treatment was blended with the urea mass ratio of 1:1, and left for 10 minutes, the fertilizer mixture began to precipitate moisture, the material became wet and muddy, and the fertilizer eventually agglomerated and appeared to become a whole piece.
  • a barrier agent on 1 ton of calcium superphosphate-rich particles.
  • the composition of the barrier is: 40% humic acid, 10% sodium lignosulfonate, 50% water mixture,
  • the medium and trace element powder formula: 70% talc powder, 10% copper sulfate, 10% sulfur, 10% manganese sulfate, and the powder mesh number is 100 mesh.
  • the particles treated by the above are rich in superphosphate, mixed with urea at a mass ratio of 1:1, and left completely loose for 3 months; untreated calcium superphosphate, mixed with urea at a mass ratio of 1:1, placed 5 Minutes, the fertilizer mixture began to precipitate moisture, the material became damp and muddy, and the fertilizer eventually agglomerated and turned into a whole piece.

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

Abstract

公开了一种阻隔颗粒过磷酸盐与颗粒尿素直接接触的方法，按以下步骤进行：在包膜滚筒前端、圆盘里或具有混合功能的混合器中投入颗粒过磷酸盐，在颗粒过磷酸盐表面喷涂一层阻隔剂；随后在包膜滚筒后端、圆盘里或是具有混合功能的混合器中，再喷涂一层中微量元素无机粉体或者高岭土、滑石粉、凹凸棒土、膨润土、石膏等惰性粉末，经过充分混合即在颗粒的过磷酸盐表面形成一层严实的阻隔层。经过此等处理的颗粒过磷酸盐与颗粒尿素按任意比例混合时，不会发生因过磷酸盐中残留的游离无机酸与尿素反应，而出现变潮和泥化的现象。该方法处理的颗粒过磷酸盐，可以与颗粒尿素肥料进行稳定混合，不吸潮，不泥化，不结块，同时工艺简单操作方便。

Description

一种阻隔颗粒过磷酸盐与颗粒尿素接触的方法 技术领域
本发明涉及掺混肥制造领域。主要是一种阻隔颗粒过磷酸盐与颗粒尿素接触的方法。
背景技术
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。
粮食的需求带动中国化肥的爆发式增长，过去十年来，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，与我们中国肥料模式截然不同的美国、加拿大、新西兰，则是以掺混肥为主，掺混肥就是将颗粒尿素，颗粒磷酸盐肥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。
近十多年来，我国东北地区开始批量施用掺混肥，农户或者农场主自行购买各种单质肥料，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、硫等中微量元素磷酸盐例如过磷酸钙盐，常用的钾肥就是颗粒氯化钾、硫酸钾。在这些肥料中，过磷酸盐是一种性价比高的磷肥，过磷酸盐的生产是用硫酸、磷酸或硝酸来分解磷矿粉，分解后的浆料经过熟化、造粒成颗粒过磷酸，磷矿石中的中量元素钙镁硅和铁、锰、锌等微量元素保留在过磷酸盐中，从营养均衡角度看过磷酸盐具有更好的效应；为保证分解往往有意控制无机酸过量，且由于反应效率问题，，肥料中含有少量的游离无机酸，而此类无机酸可以促进土壤中被固定的营养元素重新利用，因此使用颗粒磷酸盐的作物长势更加好，也深受农民认可。
但是由于颗粒过磷酸盐游离酸的存在，使得它不能与尿素接触，过磷酸盐中残留的无机酸会与尿素反应，形成磷酸脲、硫酸脲，而硫酸脲、磷酸脲吸湿点较低，在空气中容易吸潮，甚至出现液化、泥化等。使用颗粒过磷酸盐作为磷源与尿素、钾肥混合制备掺混肥时，所制得的肥料容易变湿、泥化、成团、结块，无法正常使用。
因为这一问题，在一定程度上限制了过磷酸盐在掺混肥上的应用，也制约了掺混肥行业的发展。
因此，在这样的背景下，研究一种阻隔颗粒过磷酸盐与颗粒尿素接触的方法，解决磷酸盐与尿素的掺混问题，成为当务之急。
发明内容
本发明在于提供一种阻隔颗粒过磷酸盐与颗粒尿素接触的方法，该方法处理的颗粒过磷酸盐，可以尿素进行稳定混合，混合之后的产品不吸潮，不泥化,不结块，彻底解决尿素与过磷酸盐的掺混问题，促进了掺混肥行业的发展。
一种阻隔颗粒过磷酸盐与颗粒尿素接触的方法，其特征在于按以下步骤进行：在包膜滚筒前端、圆盘里或具有混合功能的混合器中投入颗粒过磷酸盐，在颗粒过磷酸盐表面喷涂占颗粒过磷酸盐总量0.01—5％的阻隔剂；随后在包膜滚筒后端、圆盘里或是具有混合功能的混合器中，再喷涂占颗粒过磷酸盐总量0.05—20％的粉体，充分混合到在颗粒的过磷酸盐表面形成一层严实的阻隔层。
所述的颗粒过磷酸盐为颗粒过磷酸钙、富过磷酸钙、重过磷酸钙或/和上述几种颗粒过磷酸盐的混合物。
所述的阻隔剂为淀粉、糊精、改性淀粉、淀粉与丙烯酸共聚物、淀粉与木质素磺酸钙共聚物、聚乙烯醇、木质素磺酸钙与聚乙烯醇共聚物、聚乙二醇、聚丙二醇、聚乙二醇与木质素磺酸钙共聚物、木质素磺酸钙、腐殖酸及腐殖酸盐中一种物质的溶液或者二种以上混合物溶液。阻隔剂具有较强的粘结性能，能有效的吸收或者固定细小粉体；阻隔剂干燥之后，形成一层薄膜，有一定的防潮功能。
所述的粉体为含中微量元素的粉体和/或惰性粉体。
所述的中微量元素具体为：
包括含钙或镁的氧化物、氢氧化物、碳酸盐和/或者碱式碳酸盐；
或，包括含钙或镁的磷酸盐、硫酸盐、硝酸盐和/或者氯化盐；
或，包括含硫的物质硫磺、天然石膏、磷石膏、半水石膏、无水石膏、硫酸镁、硫酸钾、硫酸钾镁、硫酸铵、硫酸锌和/或者硫酸铜；
或，包括含铁、锰、硼、锌、铜、钼、硅和/或者硒的氧化物；
或，包括含铁、锰、硼、锌、铜、钼、硅和/或者硒的无机盐；
所述的惰性粉体为高岭土、滑石粉、凹凸棒土、膨润土、石膏等的一种或二种以上 的混合物。
所述的粉体目数为100-2000目。
经过阻隔处理的颗粒过磷酸盐与颗粒尿素按任意比例掺混，均能做到有效阻隔。。
本发明的优点在于：
1、简单快速。在现有肥料包膜或者混合设备内喷涂即可在颗粒磷酸盐表面包膜一层的阻隔涂层；
2、经过处理的颗粒过磷酸盐兼具有防结功能。该方法制得的颗粒过磷酸颗粒松散，不需要额外添加防结块和防粉化及剂；
3、高效防潮隔离。两层高效的防潮隔离处理，能完全避免磷酸盐与尿素接触，实现理想的隔离效果。
具体实施方式
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。本实施案例所用原料均从市场购买。
实施案例1
在包裹滚筒前端，1吨过磷酸钙颗粒上，喷涂0.5千克隔离剂，阻隔剂成分为：20％糊精，20％木质酸磺酸钙，60％水的混合物；在包膜滚筒后端，添加10千克的制备好的中微量元素粉体，包膜至颗粒松散且无明显粉尘，即得到隔离处理好的颗粒磷酸盐。所述的中微量元素粉体配方：50％氧化镁，10％氧化铜、40％硫酸锌，粉体目数为800目。
经上述处理的颗粒过磷酸钙，与颗粒尿素按质量1:1掺混，放置3个月完全松散；
没有经过上述处理的颗粒过磷酸钙，与颗粒尿素质量比1:1，放置5分钟，肥料混合物开始析出水分，物料变潮湿，粘稠，肥料最终结块，呈现变成一整块。
实施案例2
在圆盘内，在1吨重过磷酸钙颗粒上，喷涂2.5千克的阻隔剂，阻隔剂成分为：10％腐殖酸，30％淀粉与丙烯酸共聚物，60％水的混合物。
在圆盘内，喷涂80千克的制备好的中微量元素粉体，包膜至颗粒松散且无明显粉尘，即得到处理好的颗粒重过磷酸钙。所述的中微量元素粉体配方：80％硫酸钙，10％硼酸、10％硫酸锰，粉体目数为300目。
经上述处理的颗粒重过磷酸钙，与颗粒尿素质量比1:1掺混，放置4个月完全松散；
没有经过上述处理的重过磷酸钙，与尿素质量比1:1掺混，放置10分钟，肥料混合物开始析出水分，物料变潮湿、泥化，肥料最终结块，呈现变成一整块。
实施案例3
在圆盘内，在1吨富过磷酸钙颗粒上，喷涂10千克阻隔剂，阻隔剂成分为：30％腐殖酸，10％聚乙烯醇3000，60％水的混合物，
在圆盘内，再喷涂200千克的制备好的中微量元素粉体，包膜至颗粒松散且无明显粉尘，即得到隔离处理好的富过磷酸钙。
所述的中微量元素粉体配方：70％滑石粉，10％硫酸铜、10％硫磺、10％硫酸锰，粉体目数为300目。
经上述处理的颗粒富过磷酸钙，与尿素按质量比1:1掺混，放置3个月完全松散；
没有经过处理的富过磷酸钙，与尿素按质量比1:1掺混，放置5分钟，肥料混合物开始析出水分，物料变潮湿、泥化，肥料最终结块，呈现变成一整块。
实施案例4
在圆盘内，在1吨重过磷酸钙颗粒上，喷涂0.1千克的阻隔剂，阻隔剂成分为：10％腐殖酸钠，40％改性淀粉，50％水的混合物。
在圆盘内，喷涂200千克的制备好的中微量元素粉体，包膜至颗粒松散且无明显粉尘，即得到处理好的颗粒重过磷酸钙。所述的中微量元素粉体配方：80％硫酸钙，10％硼酸、10％硫酸锰，粉体目数为1000目。
经上述处理的颗粒重过磷酸钙，与颗粒尿素质量比1:1掺混，放置4个月完全松散；
没有经过上述处理的重过磷酸钙，与尿素质量比1:1掺混，放置10分钟，肥料混合物开始析出水分，物料变潮湿、泥化，肥料最终结块，呈现变成一整块。
实施案例5
在圆盘内，在1吨富过磷酸钙颗粒上，喷涂50千克阻隔剂，阻隔剂成分为：40％腐殖酸，10％木质素磺酸钠，50％水的混合物，
在圆盘内，再喷涂5千克的制备好的中微量元素粉体，包膜至颗粒松散且无明显粉尘，即得到隔离处理好的富过磷酸钙。
所述的中微量元素粉体配方：70％滑石粉，10％硫酸铜、10％硫磺、10％硫酸锰，粉体目数为100目。
经上述处理的颗粒富过磷酸钙，与尿素按质量比1:1掺混，放置3个月完全松散；没有经过处理的富过磷酸钙，与尿素按质量比1:1掺混，放置5分钟，肥料混合物开始析出水分，物料变潮湿、泥化，肥料最终结块，呈现变成一整块。

Claims (8)

  1. 一种阻隔颗粒过磷酸盐与颗粒尿素接触的方法，其特征在于按以下步骤进行：在包膜滚筒前端、圆盘里或具有混合功能的混合器中投入颗粒过磷酸盐，在颗粒过磷酸盐表面喷涂占颗粒过磷酸盐总量0.01—5％的阻隔剂；随后在包膜滚筒后端、圆盘里或是具有混合功能的混合器中，再喷涂占颗粒过磷酸盐总量0.05—20％的粉体，充分混合到在颗粒的过磷酸盐表面形成一层严实的阻隔层。
  2. 如权利要求1所述的一种阻隔颗粒过磷酸盐与颗粒尿素接触的方法，其特征在于：所述的颗粒过磷酸盐为颗粒过磷酸钙、富过磷酸钙、重过磷酸钙或/和上述几种颗粒过磷酸盐的混合物。
  3. 如权利要求1所述的一种阻隔颗粒过磷酸盐与颗粒尿素接触的方法，其特征在于：所述的阻隔剂为淀粉、糊精、改性淀粉、淀粉与丙烯酸共聚物、淀粉与木质素磺酸钙共聚物、聚乙烯醇、木质素磺酸钙与聚乙烯醇共聚物、聚乙二醇、聚丙二醇、聚乙二醇与木质素磺酸钙共聚物、木质素磺酸钙、腐殖酸及腐殖酸盐中一种物质的溶液或者二种以上混合物溶液。
  4. 如权利要求1所述的一种阻隔颗粒过磷酸盐与颗粒尿素接触的方法，其特征在于：所述的粉体为含中微量元素的粉体和/或惰性粉体。
  5. 如权利要求4所述的一种阻隔颗粒过磷酸盐与颗粒尿素接触的方法，其特征在于：所述的中微量元素具体为：
    包括含钙或镁的氧化物、氢氧化物、碳酸盐和/或者碱式碳酸盐；
    或，包括含钙或镁的磷酸盐、硫酸盐、硝酸盐和/或者氯化盐；
    或，包括含硫的物质硫磺、天然石膏、磷石膏、半水石膏、无水石膏、硫酸镁、硫酸钾、硫酸钾镁、硫酸铵、硫酸锌和/或者硫酸铜；
    或，包括含铁、锰、硼、锌、铜、钼、硅和/或者硒的氧化物；
    或，包括含铁、锰、硼、锌、铜、钼、硅和/或者硒的无机盐；
  6. 如权利要求4所述的一种阻隔颗粒过磷酸盐与颗粒尿素接触的方法，其特征在于：所述的惰性粉体为高岭土、滑石粉、凹凸棒土、膨润土、石膏等的一种或二种以上的混 合物。
  7. 如权利要求4所述的一种颗粒过磷酸盐和颗粒尿素接触的方法，其特征在于：所述的粉体目数为100-2000目。
  8. 如权利要求1所述的一种阻隔颗粒过磷酸盐与颗粒尿素接触的方法，其特征在于：经过阻隔处理的颗粒过磷酸盐与颗粒尿素按任意比例掺混，均能做到有效阻隔。
PCT/CN2017/102225 2017-09-05 2017-09-19 阻隔颗粒过磷酸盐与颗粒尿素接触的方法 WO2019047267A1 (zh)

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