Material
Potash
Answer in brief
Potash is a salt, and it behaves like one: it takes up moisture, cakes hard and corrodes the building around it.
Terminal operators measure success in whether the pile can still be reclaimed after a humid month.
- Control humidity in storage, since the cake forms during cycles rather than at a fixed level.
- Select corrosion-resistant materials for everything in contact.
- Expect segregation when grades are blended.
Reviewed October 21, 2026 · Updated October 21, 2026
Handling challenges
Potash terminals are built around humidity rather than around tonnage.
Caking
Moisture dissolves crystal surfaces and drying recrystallises them, bonding grains into a solid mass.
- Controlled or dehumidified warehouse ventilation.
- Anti-caking treatment where the specification allows it.
- Limited pile height and storage time for fine grades.
Breaking a caked pile is done with mobile equipment, and it damages both the product and the building.
Corrosion
Damp potash attacks carbon steel structures, fasteners and conveyor components.
Coatings, stainless or polymer components in contact areas and regular washdown extend the life of the terminal.
Segregation in blends
Bulk blends separate by particle size during every transfer, which changes the nutrient ratio delivered to the field.
Matching particle size across the blend is more effective than improving the blender.
Dust at loading
Ship and truck loading produce visible plumes; cascade chutes and telescopic spouts with extraction contain the column.
What to establish before buying equipment
- Grade, particle size and anti-caking treatment on receipt.
- Humidity profile inside the storage across the year.
- Materials of construction for all contact and structural parts.
- Loading rate and dust control method.
Material behavior
- Flowability
- Free flowing when dry
- Abrasiveness
- Moderate
- Cohesiveness
- Low when dry, hard caking after humidity cycling
- Moisture behavior
- Hygroscopic; critical relative humidity varies with grade and temperature
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