{"id":1588,"date":"2025-07-16T16:38:48","date_gmt":"2025-07-16T08:38:48","guid":{"rendered":"https:\/\/www.yrcchem.com\/?p=1588"},"modified":"2025-07-28T10:35:42","modified_gmt":"2025-07-28T02:35:42","slug":"np8-40-deep-processing-of-compound-fertilizers-the-advanced-path-from-basic-formula-to-high-efficiency-fertilizers","status":"publish","type":"post","link":"https:\/\/www.yrcchem.com\/fr\/np8-40-deep-processing-of-compound-fertilizers-the-advanced-path-from-basic-formula-to-high-efficiency-fertilizers\/","title":{"rendered":"NP8-40 Deep processing of compound fertilizers: the advanced path from basic formula to high-efficiency fertilizers"},"content":{"rendered":"
\"Engrais
Engrais compos\u00e9 NP 8-40<\/figcaption><\/figure>\n\n\n\n

NP8-40<\/a> compound fertilizer (8% nitrogen and 40% phosphorus in P\u2082O\u2085) can significantly improve fertilizer efficiency and applicability through deep processing. This article analyzes its deep processing process and shows the transformation from raw materials to efficient fertilizers.\u200b<\/p>\n\n\n\n

1. Raw material preconditioning: build a solid foundation<\/h2>\n\n\n\n

\uff081\uff09Purification of nitrogen and phosphorus raw materials<\/h3>\n\n\n\n

Nitrogen source:<\/strong> Choose high-purity urea (nitrogen \u226546.4%) or ammonium nitrate (nitrogen \u226533.5%), and remove impurities through re-crystallization, and the Urea dimer content is reduced to below 0.3%.\u200b<\/p>\n\n\n\n

Phosphorus source: <\/strong>Use mono-ammonium phosphate (P\u2082O\u2085\u226555%) or ammonium phosphate (P\u2082O\u2085\u226553%) to dry at low temperature until moisture is \u22641.0%, and crush to 80 mesh fineness.\u200b<\/p>\n\n\n\n

\uff082\uff09Preconditioning of auxiliary materials<\/h3>\n\n\n\n

Anti-caking agent:<\/strong> Food grade talc powder (particle size \u226410\u03bcm) is sterilized at 120\u2103 for later use.\u200b<\/p>\n\n\n\n

Sustained release agent:<\/strong> epoxy resin or sulfur crush to 50 mesh and make a suspension with water 1:3.\u200b<\/p>\n\n\n\n

Soil conditioner:<\/strong> Acid soil is suitable for calcined dolomite powder (calcium \u226530%) and grind it into a 100 mesh sieve.\u200b<\/p>\n\n\n\n

2. Core deep processing link: precision technology<\/h2>\n\n\n\n

\uff081\uff09High temperature melting reaction<\/h3>\n\n\n\n

The nitrogen and phosphorus raw materials are put into the melting reactor in proportion, and the reaction is stirred at 180-200\u2103 for 1-2 hours to form urea phosphate crystals and enhance nutrient activity. Nitrogen protects and prevents nitrogen volatility, and regulates temperature and pH value online (5.5-6.5).\u200b<\/p>\n\n\n\n

\uff082\uff09Granulation process upgrade<\/h3>\n\n\n\n

Rotating drum granulation:<\/strong> The melted slurry and auxiliary materials are put into the rotating drum, spray water at a speed of 15-20r\/min to form 2-4mm particles, with a control strength \u22652.5N.\u200b<\/p>\n\n\n\n

Example diagram<\/strong><\/p>\n\n\n\n

\"Rotary<\/a><\/figure>\n\n\n\n

Extrusion and granulation:<\/strong> The dry material (moisture \u22642%) is extruded into strips by a twin-screw machine high pressure (15-20MPa), and the particle size uniformity after pelleting reaches more than 95%.\u200b<\/p>\n\n\n\n

Envelope granulation:<\/strong> After granulation, the sustained-release suspension is sprayed with a Suspended bed, and dried at 60\u00b0C in hot air to form a 0.1-0.2mm envelope, and the nitrogen release period is extended to 60-90 days.\u200b<\/p>\n\n\n\n

Granulation process<\/strong><\/strong><\/td>D<\/strong>evice<\/strong><\/strong><\/td>Particle size<\/strong><\/strong><\/td>S<\/strong>trength<\/strong><\/strong><\/td>Sc\u00e9narios applicables<\/strong><\/strong><\/td><\/tr>
Drum granulation<\/td>Rotary Drum Granulate<\/td>2-4mm<\/td>2.8N<\/td>General field crops<\/td><\/tr>
extrusion granulation<\/td>Twin screw extrusion granulate<\/td>3mm\u00b10.2mm<\/td>3.5N<\/td>High concentration demand plot<\/td><\/tr>
Capsule granulation<\/td>Suspended bed coating machine<\/td>2-4mm<\/td>2.6N<\/td>Fruit trees, vegetables, and other crops with long cycles<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\uff083\uff09Low temperature drying and cooling<\/h3>\n\n\n\n

Stage drying:<\/strong> remove surface water at 80\u2103 for 30 minutes, remove internal water at 100\u2103 for 20 minutes, and final moisture content is 0.5%-1.0%.\u200b<\/p>\n\n\n\n

Air-cooled to below 40\u2103 to prevent agglomeration and increase particle hardness.\u200b<\/p>\n\n\n\n

Process diagram of drying and cooling production line<\/h3>\n\n\n\n
\"Process<\/figure>\n\n\n\n

3. Quality control: Ensure compliance with standards<\/h2>\n\n\n\n

\uff081\uff09Key indicator detection<\/h3>\n\n\n\n

Nutrients (nitrogen 8.0%\u00b10.3%, phosphorus 40.0%\u00b10.5%), physical properties (strength, particle size) and heavy metals (lead \u22645mg\/kg, cadmium \u22640.5mg\/kg) were measured in each batch, which was in accordance with GB\/T 15063-2020.\u200b<\/p>\n\n\n\n

\uff082\uff09Small and pilot tests<\/h3>\n\n\n\n

Small test:<\/strong> Test the dissolution and release curve of fertilizer in different soils.\u200b<\/p>\n\n\n\n

Pilot:<\/strong> Comparative planting in fields to verify the impact on crop growth.\u200b<\/p>\n\n\n\n

4. Advantages of deep processing\u200b<\/h2>\n\n\n\n

Improved fertilizer efficiency: <\/strong>Stabilized Nutrients <\/strong>nitrogen and phosphorus have increased the absorption rate from 30%-40% to 50%-60%, and wheat production in phosphorus-deficient soils has increased by 15%-20%.\u200b<\/p>\n\n\n\n

Wide applicability:<\/strong> The anti-caking type will not caking for 3 months at 80% humidity, and the sustained-release type will meet the needs of long-term crops.\u200b<\/p>\n\n\n\n

More environmentally friendly:<\/strong> The envelope reduces nitrogen leaching loss by more than 30%, and adding conditioning agents can improve soil pH.\u200b<\/p>\n\n\n\n

5.Conclusion<\/h2>\n\n\n\n

NP8-40 Deep processing of compound fertilizers is a multi-link collaborative optimization process that can convert basic formulas into efficient fertilizers. Continuously upgrading the process can better help crop quality and farmers increase their income in modern agriculture.<\/p>\n\n\n\n