Water separation stands out 1.6 km.

Your other methods have not been elaborated & so must be hiding somethings, such as how long does it take a current of air to separate stone dust from sawdust & what is the point of adding lots of small stones to a mixture already containing stones? ■

Would water be a good idea since the wood waste is going to be burnt? I might have thought that to maximuse the energy output the wood should be as dry as possible. ■

Depending upon your particle size of the wood waste and the rocks there are a number of sucessful systems that do not involve water. If it is big waste and big rocks then give us a call for a cheap and effective solution. If it is small rocks and small waste then an air separation system is best suited. ■

After you'll separate the wood from the rocks you'll have to treat the water, we can offer you an economic solution in order to recover the water for recycling, using the multi-frequency screener of Vibrofilter. Which can revolutionaize your costs of operation.

For extensive information please contact me.

Best Regards, ■

Doug, Good question. this can be tough. We have dedusting units that may be able to help. You can send us a product sample and we can do a free of charge testing with no obligation to buy. www.pelletroncorp.com

Nick ■

Douglas,

The General Kinematics De-Stoner™ is a performance proven method of separation and classification for a wide range of wood materials. Energy-efficient vibratory action and high velocity, low pressure air streams work in tandem to fluidize and stratify commingled materials according to differences in terminal particle velocity. Many De-Stoner systems are designed with "air curtains" to provide further separation after the initial cut of "heavies". The result: fast, efficient removal of heavy materials such as stones, metallics, and glass from lightweight materials such as aluminium, paper, plastics and wood.

Our economical, completely dry De-Stoner system eliminates the need for a water supply and other attendant "wet" system problems. However, the De-Stoner can easily handle moist materials.

More features and benefits

• Virtually jam-proof design with no moving separator parts.

• Inherently simple, fully isolated design minimizes foundation requirements.

• Efficient, fully adjustable two-mass natural frequency design lets you fine tune destoner separation.

• Versatile design separates material of different density, or equal densities with varying particle size.

• De-Stoner driven by energy efficient low horsepower motor.

• Rugged, heavy duty construction withstands 24-hour operation.

• Wide range of application engineered options, including base mounted blower, air knives, curtains, and fluidized decks to meet your specific needs.

If you would like more information, please contact Bill Guptail at 815-455-3222 or by email: bguptail@generalkinematics.com

■

Dear Mr. Doug,

As a general rule, the most suitable method will depend upon the percentage of wood waste and percentage of rock in the mixture of wood waste and rock, and the size gradation of wood waste and the rock. It also depends upon the description of rock and description of the wood waste. The method to be used has also relevance to the hourly capacity.

This information will enable the respondents to reply more appropriately.

Regards,

Ishwar G Mulani.

Author of Book : Engineering Science and Application Design for Belt Conveyors.

Author of Book : Belt Feeder Design and Hopper Bin Silo

Advisor / Consultant for Bulk Material Handling System & Issues.

Email : parimul@pn2.vsnl.net.in

Tel.: 0091 (0)20 25882916 ■

Lots of good answers above.

1. This can be done fairly easily on a vibrating screen with light gauge perf on the top deck to allow the WOOD portions to smoothly pass down the deck and NOT JAM into the hole openings. If you use WOVEN WIRE CLOTH on here...the knuckles at the interweave positions cause a small DAM or restriction ...stall the travel and tip the wood up and cause the wood which is irregularly shaped to PLUG THE HOLE.

2. There are lots of RECIPROCATING action type of wood screeners working nicely out there...side to side motion vs CIRCLE THROW design like the above mentioned screener.

3. SINK float tank works nicely.....but this of course is WET....but fairly effective. Put all feed material into a tank with belt coming from underwater to EXIT the tank. The heavies STONES, ETC drop down and exit on the belt....the lights OR WOOD float out and over a weir overflow device. MORE used in the C&D recycling operations but effective for sure.

4. In any event, it is pretty critical to get the screening media absolutely picked right to make it work properly. ■