ManufacturingBy Amit Shah, Plant Operations Lead
Micronutrient Fertilizer Bulk Blending: Incorporating Mineral Sulphates into Custom NPK Granulations Without Segregation
Published on 2026-08-2013 mins readFCO 1985 & ISO 9001:2015 Verified
Executive Summary & Key Takeaways
An industrial engineering guide for fertilizer blending plants. Learn how matching granule Size Guide Numbers (SGN) and moisture control prevents nutrient separation.
Table of Contents (Jump to Section)
Bulk dry blending of compound fertilizers allows regional agrochemical blenders to formulate customized NPK + Micronutrient grades tailored to local soil testing data. However, micronutrient fertilizer bulk blending in custom NPK manufacturing requires precision engineering to prevent granule segregation and physical caking.
1. The Challenge of Particle Size Distribution (PSD)
When blending granular Urea, DAP, and Potash with micronutrient minerals, size segregation can cause uneven field broadcasting:- •Size Guide Number (SGN): Auron manufactures granular Zinc Sulphate Monohydrate 33% and Ferrous Sulphate Monohydrate 30% with an SGN matching standard commercial NPK granules (200–260 SGN).
- •Uniformity Index (UI): High UI (> 50) ensures granules resist ballistic segregation during conveyor transfer and truck transit.
2. Compatibility & Chemical Reaction Matrix
- •Urea Compatibility: Dry mineral sulphates blend safely with urea under controlled ambient relative humidity (< 60%).
- •Phosphate Blends: High-purity granular sulphates prevent the premature conversion of water-soluble P2O5 into insoluble metal phosphates.
3. Commercial Blending Equipment & Coating
Utilizing rotary drum blenders and applying 0.2% anti-caking oil coating ensures homogeneous nutrient delivery in every 50 kg commercial bag.Direct Manufacturer SourcingAuron Fertilizers · Ahmedabad, Gujarat
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