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Fully soluble phosphate sources; the base of most formulas.
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01 · Complete production solution
Granular Water-Soluble Fertilizer Line
Turns water-soluble powder into granules that dissolve cleanly without dusting, so the product can be spread or blended instead of only fertigated.
02
Quick answer
What this line is
The chemistry is already decided by the powder; the line only changes its physical form. What needs engineering is solubility after granulation: a granule that will not dissolve is a defect, not a feature.
The granulator must not add insolubles; binder selection decides whether the product still passes the jar test.
03
Inputs
Suitable raw materials
Every input must be fully soluble in the target water. An insoluble filler will show up as residue at the customer.
Potassium nitrate / sulfate
Soluble potash; potassium sulfate is slower to dissolve than nitrate.
Calcium nitrate
Highly hygroscopic; needs a dry line and a sealed bag.
Micronutrient chelates
Added in small shares; they set the batching accuracy requirement.
Binder
Must be soluble. Starch or a soluble polymer, never clay.
04
Output
Target finished product
The buyer tests two things: does it dissolve, and does the EC match the label. Both are affected by what the line adds.
Dissolution
Complete in the stated time at the stated concentration and water temperature.
Residue
Insoluble matter below the buyer limit; binder and filler are the usual culprits.
Granule size
1–3 mm for blending, 2–4 mm for direct application.
Caking
Cooling and coating decide whether the bag pours in a humid store.
05
Production sequence
Process flow
Six stages. The granulation and drying steps are where solubility is either preserved or lost.
| Stage | Purpose | Key equipment | Control point |
|---|---|---|---|
| 1. Batching | Weigh soluble salts to formula | Automatic batching machine | Small-share accuracy |
| 2. Mixing | Homogenise before granulation | Double-shaft mixer | No lump formation |
| 3. Granulation | Build a soluble granule | Disc granulator or roller press | Binder type and dose |
| 4. Drying & cooling | Reach spec moisture without thermal damage | Rotary drum dryer and cooler | Nitrate temperature limit |
| 5. Screening | Cut to the declared size | Rotary drum screener | Oversize recycle |
| 6. Packing | Seal against humidity | Packing machine | Bag barrier quality |
Why this order: drying a nitrate-based granule too hard creates a glassy skin that will not dissolve. Moisture target and temperature limit come from the formula, not from the dryer capacity.
06
Equipment
Equipment configuration
Typical equipment scope for this route. Final selection follows the approved mass balance and site conditions.
Mixing
Double-Shaft Mixer
Granulation
Disc Granulator
Drying
Rotary Drum Dryer
Screening
Rotary Drum Screener
Packing
Fertilizer Packing Machine
07
Capacity
Capacity bands
Bands describe typical project scale; the actual figure is confirmed by mass balance, not by a nominal model number.
Single disc granulator; batch drying.
Parallel granulators, continuous drying and screening.
Multi-line plant with automated packing.
08
Operation
Utility requirements
Basis for the utility sheet. Local voltage, fuel and water quality are confirmed during engineering.
Power
Granulator and dryer dominate.
Fuel
Dryer heat; indirect hot air keeps combustion products out of a sensitive product.
Water
Only for binder preparation; excess water lengthens drying and risks dissolution loss.
Dehumidified storage
Nitrate and chelate raw materials must stay dry.
09
Quality
Quality control points
Controls that decide whether the line holds its specification in daily operation.
Jar test
Dissolution time and residue, per batch.
Binder dose
The one variable that quietly changes solubility.
Dryer discharge temperature
Glassy skin forms above the formula limit.
Bag barrier
A good granule in a poor bag cakes anyway.
10
FAQ
Questions buyers ask
Straight answers on scope, limits and what we need to quote.
Will the granule dissolve as fast as the powder?
Slightly slower by design. What matters is that it dissolves completely within the buyer stated time; we test that before the binder is fixed.
Disc or roller granulation?
Disc for rounder granules and lower output; roller for higher output and drier mixes. Solubility testing decides.
Can we granulate calcium nitrate?
It is possible but difficult: highly hygroscopic, so cooling, coating and the bag barrier carry most of the risk.
What do you need to quote?
The formula, the buyer dissolution spec, granule size and bag type.
11
Next step
Request a project review
Send material, capacity and site constraints; the engineering team replies with a route recommendation.
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