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Silica Sand

Answer in brief

Sand flows beautifully and destroys everything it flows through.

The handling question is rarely whether the material will move; it is how fast the bends, valve seats and screw flights will disappear, and how the respirable fraction is kept away from people.

  • Select velocity and wear protection together, since erosion rises steeply with velocity.
  • Expect segregation by grain size in every silo and stockpile.
  • Treat respirable crystalline silica as a regulated exposure, not as nuisance dust.

Reviewed October 21, 2026 · Updated November 10, 2026

Handling challenges

Silica sand is the reference material for abrasion, and a plant that handles it learns the real service life of every component.

Wear and velocity

Erosion in a pneumatic line rises far faster than conveying velocity, so a small reduction in velocity buys a large gain in bend life.

  • Dense phase conveying at low velocity where the distance and rate allow it.
  • Long-radius or dead-end bends and ceramic or hardened inserts at impact points.
  • Valve types chosen for abrasive service rather than for cost per unit.

Segregation

Sand is sold on grading, and every fill and discharge sorts it by size.

Coarse grains roll to the outside of a pile while fines stay in the centre, so a funnel-flow silo can deliver a different grading at the start and the end of a batch.

Mass flow design and careful fill point location keep the delivered grading closer to the specification.

Moisture

Dry sand flows; sand at a few percent moisture bridges over outlets and builds up on chute walls.

Drying, heated hoppers or a design that simply accepts and clears buildup are the practical options, and they should be chosen rather than discovered.

Respirable silica

Fine quartz dust causes irreversible lung disease, and exposure limits are strict and enforced.

Enclosure, extraction at transfer points, water suppression where the process allows and monitoring at operator positions form the usual control set.

What to establish before buying equipment

  • Grading curve and the acceptable change between silo inlet and outlet.
  • Moisture range on receipt, which determines the flow case.
  • Design velocity and the resulting wear budget per component.
  • Applicable silica exposure limit and the sampling plan.

Storage and conditioning

Dry sand stores and discharges without drama, and that is the trap: the design gets built for the easy case.

Damp sand is a different material. A few percent of surface moisture turns a free-flowing granule into something that bridges over a wide outlet and sticks to every wall it touches.

  • Decide whether the material can arrive wet, and if it can, size for the wet case.
  • Covered storage is the cheapest way to keep the easy case.
  • In freezing climates, damp sand becomes a solid block, which no discharge aid will cure.

What this means for equipment

Abrasion decides everything here.

Quartz is harder than the steel it runs through, so the design question is where the wear is allowed to happen and how fast a worn part can be replaced. Velocity is the main lever: halving it changes the bend life out of all proportion.

  • Belt or dense phase rather than dilute phase for continuous duty.
  • Ceramic or hardfaced bends, impact beds and replaceable liners at every drop.
  • Screw conveyors only for short distances, with hardfaced flights.

Safety and regulatory

The hazard is respirable crystalline silica, and it is a serious one.

Fine quartz dust causes irreversible lung disease, and exposure limits are low. This is not a nuisance dust that good housekeeping covers; it needs engineering control.

  • Capture or suppression at every transfer point, designed as part of the process.
  • Closed handling of collected dust, which is the finest and most dangerous fraction.
  • Exposure monitoring where people work near open handling.

Material behavior

Flowability
Free flowing when dry
Abrasiveness
Very high
Cohesiveness
Low when dry, bridges when damp
Moisture behavior
Damp sand bridges and builds up in chutes
Contamination risk
Respirable crystalline silica exposure

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Frequently asked questions

Why is dilute phase conveying a bad idea for sand?

Because wear rises steeply with velocity and quartz is harder than the steel it runs through. A dilute phase line can need new bends within months.

What changes when sand is damp?

Everything about the flow. A few percent of surface moisture turns a free-flowing granule into a cohesive material that bridges over a wide outlet.

Is silica dust really that dangerous?

Yes. The respirable fraction causes irreversible lung disease and exposure limits are low. It needs engineering control at the source, not housekeeping.

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