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Destoner

Also called: destoner machine, rice destoner, stone separator, gravity destoner

Step 2 of 8: Cleaning

A sloping, vibrating deck with air blown up through it. The grain floats down one way while the heavier stones climb the deck and leave at the top.

Availability subject to feasibility check

Prices depend on the specification and the supplier. Request a quote.

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Example of a Destoner
Example of this machine type, not a specific model we supply.Photo: Supplier listing, used with permission, indiamart.com, edited

Destoner: how it works

  1. Grain flows onto a sloping deck of woven wire that vibrates.
  2. Air blown up through the deck lifts the lighter grain slightly, so it floats down the slope.
  3. Stones are heavier and stay on the deck; the vibration walks them uphill to their own outlet.
  4. Clean grain leaves at the low end, and stones, glass and metal bits at the high end.

Main types

Pressure-type destoner
Its own fan blows air up through the deck. Simple and open.
Suction-type destoner
Closed, with air drawn through by an outside fan, so dust does not escape into the mill.
Combined cleaner and destoner
Sieves and a destoning deck in one frame, for small mills with little space.

Where it fits in the process

It follows the pre-cleaner in the cleaning section. Many mills use a second destoner on brown or white rice before packing.

Destoner price in Bangladesh: how to get a quote

We do not publish prices. The price of a machine depends on its specification, the supplier and the shipping terms, and it changes with the market. Tell us the points below: we check feasibility and the import rules, then send you a quotation.

What to tell us

  • What it will clean: paddy, brown rice or white rice.
  • How much grain passes in an hour.
  • Pressure or suction type, and the dust system you have.
  • New or reconditioned.
Request a quote

Common questions

How does a destoner machine work?

It uses the difference in weight between grain and stone. On a vibrating deck with air blowing through it, light grain floats downhill and heavy stones are carried uphill, so the two leave at opposite ends.

Why do stones still appear in rice after cleaning?

Usually because the destoner is overloaded, its air is set wrong or its deck is worn or blocked. Feeding it evenly, at the rate it was made for, and keeping the deck clean solves most cases.

What is the price of a destoner machine in Bangladesh?

We do not publish prices. The price depends on the type, how much grain it must handle in an hour and whether the fan and dust collection are included. Send us the points listed above and we will quote.

More machines in this step: Cleaning

  • Pre-cleaner

    Vibrating sieves and a draft of air that take out straw, dust, chaff and large stones before the paddy goes into the mill.

    Availability subject to feasibility check

    Request this machine

  • Magnetic separator

    Magnets in the grain flow that catch nails, wire and other bits of iron before they can damage the rolls and stones of the machines that follow.

    Availability subject to feasibility check

    Request this machine