阅读说明：本技术 用于获得粒状磷酸盐肥料的方法和所获得的磷酸盐肥料 (Method for obtaining a granulated phosphate fertilizer and phosphate fertilizer obtained ) 是由 塞尔希奥·阿塔雷斯雷亚尔 华金·罗梅罗洛佩斯 伊格纳西·萨拉特马多兰 马里亚·费雷尔希内斯 于 2018-10-05 设计创作，主要内容包括：本发明提供了用于从天然原料磷酸盐岩、碳源、溶磷微生物的代谢诱导剂和水获得直接用于农业的作为磷源的粒状磷酸盐肥料的方法。(The present invention provides a process for obtaining a granulated phosphate fertilizer as a phosphorus source for direct use in agriculture from natural raw materials phosphate rock, a carbon source, a metabolic inducer of phosphate solubilizing microorganisms and water.)

1. A process for obtaining a granulated phosphate fertilizer, consisting of the following steps:

i) granulating ground phosphate rock having a particle size of 100 to 500 μm and a humidity of 1 to 2%, a natural carbon source in a ground state having a particle size of 0.1 to 1mm and a humidity of 25 to 35%, a metabolism inducer of phosphorus-solubilizing microorganisms, and water in a granulator;

ii) drying the granules obtained in step i) by a flow of hot air gradually heated from 50 ℃ to 290 ℃, avoiding rapid evaporation of water, wherein the granule exit temperature is 50 ℃;

iii) cooling the dried particles by a stream of drying air at room temperature of 20 ℃ to 25 ℃;

iv) sieving the cooled granules to remove non-granulated material and deteriorated granules to obtain granules having a particle size (mean diameter) of 1.5mm to 3.5 mm;

v) drying the granules by direct heating at a temperature of 300 ℃, reducing the humidity of the granules to a maximum of 2%, wherein the granule outlet temperature is 40 ℃;

vi) cooling the particles by a stream of dry air at room temperature of 20 ℃ to 25 ℃;

vii) optionally, adding 10⁵ucf/g of another phosphate solubilizing microorganism of the genus Bacillus or Pseudomonas;

viii) sieving the granules to obtain granules having an average particle size of 2mm to 4 mm.

2. The process according to claim 1, wherein in step i) the starting materials are introduced into the granulator in a proportion of 50 to 80% by weight of phosphate rock, 20 to 40% by weight of natural carbon source, 3% to 7% of metabolic inducer of phosphate solubilizing microorganisms in liquid form and a proportion of at least 10% by weight of water.

3. The method according to claim 2, wherein the metabolic inducer is used in a proportion of 5% to 7%.

4. The method of claim 1, wherein the phosphate rock is selected from phosphate rocks having the following characteristics:

5. the method of claim 1, wherein the natural carbon source is selected from weathered coal, black coal, anthracite, or lignite.

6. The method of claim 5, wherein the natural carbon source is weathered coal having the following characteristics:

mean value of pH 3.27 Humidity 28.68％ Organic matter 29.56％ K₂O 0.2％ Humic substance extract 25 to 38 percent Humic acid 17 to 30 percent Fulic acid 15 to 25 percent Al 0.17％ Fe 0.3％ Na 0.25％ Si 0.34％ MgO 0.41％ CaO 1.47％

。

7. A granulated phosphate fertilizer obtained according to the process of claims 1 to 6, comprising 25% of total P₂O₅With humic acid.

8. Use of the fertilizer according to claim 7 as an organic amendment for agricultural and forest soils directly and/or for mixing with other substances to obtain a compound fertilizer product or an organo-mineral fertilizer.