Re: Removal Of Stainless Steel
Wood and stainless will have different density. So when they are conveyed they will attain different momenum ( Mass x velocity ). So after the conveyor discharge they may fall at different distance. Stainless steel at far away than wooden chips. Accordingly we may provide a chute for separation.
Dear Mr.Designer : I have never seen such an arrangement. The above is purely based on my idea and assumption. Hope this may or may not help you. ■
Re: Removal Of Stainless Steel
Another wild idea if it is OK for you.
Can it be passed through a stream of water ?
Regards, ■
Re: Removal Of Stainless Steel
Flotation separation has already been discounted as the chips are to be burnt so extra water to be evaporated is a no-no.
Ballistic separation, or impact rebound might work but I doubt it as the metal size range can be large.
Maybe metal detection in a chute with flap valve to divert the metal, as long as we don't get a huge pile of rejected wood chips with the metal.
I might have thought there would be standard equipment to remove stainless steel available, it must be a common enough problem? ■
Re: Removal Of Stainless Steel
I am not sure the size of the peices you are working with but a General Kinematics air seperator might do the trick. They are commonly used in the wood industry to remove rock from hog fuel. Please let me know if you would like further information.
Best Regards,
Todd
http://www.generalkinematics.com/rec...m/productid/29 ■
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I think u should go for Metal Detector with Pneumaticaly actuated Diverter Flap. U will get some wood-chips also alongwith metal.
Ballistic separation, or impact rebound might work but I doubt it as the metal size range can be large.
Maybe metal detection in a chute with flap valve to divert the metal, as long as we don't get a huge pile of rejected wood chips with the metal.
I might have thought there would be standard equipment to remove stainless steel available, it must be a common enough problem?
■
Re: Removal Of Stainless Steel
The first question that occurs to me is "why is there stainless steel in the wood chips"
If you could change the metal upstream, you could use a magnet downstream. ■
Re: Removal Of Stainless Steel
Stainless steel is only part of what is in the wood chips.
It's waste reclaimed timber chipped for recycling. So there's ferrous steel, stainless steel, iron, brass, aluminium, plastic etc, etc, etc. None of it in great amounts but enough to cause damage and downtime in handling equipment. Saying "I don't want wood chips with contaminants" is not an option, it will be there ■
Re: Removal Of Stainless Steel
Dear Mr.Designer,
Can you install a big fan in front of the vertical fall of this material?
Can wood chips be separated by this air stream which will be perpendicularly passing, of this falling material?
Rgds, ■
Re: Removal Of Stainless Steel
I see that Nippon Magnetics USA make a separator specifically designed to remove stainless steel from streams like wood chips.
http://www.nipponmagnetics.com/stain...dustry-10.html
But perhaps there are limitations according to the grade of stainless steel? ■
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My suggestion is to go with mr. Gopal`s idea. manually remove the rejects by hand. also to note the frequency of the SS material, which is vital to decide. ■
Re: Removal Of Stainless Steel
Remember -
1) I have a constant stream at 75 m3/hr
2) The wood chips are 75mm to dust
3) The stainless steel can be 50mm down to 1mm
4) The wood chips need to be burnt
5) I'm in the UK, labour for manual sorting is VERY expensive
6) Environmental concerns are important
Turning to some of your ideas -
a) If I use metal detection and bypass, what do I do with the chips that bypass with the metal? They still need to be burnt.
b) Due to the particle size of both chips and metal I don't see air separation working consistently, but I do see a lot of dusty air that will need to be cleaned.
c) I have sent an enquiry to Nippon Magnetics to see what they can offer.
d) Any manual operations are non-starters.
I think we're at the end of the road. ■
Removal of Stainless Steel
I am advised that non-magnetic stainless steel cannot be removed by an eddy current seperator.
As it cannot be removed with a magnetic device, what methods are available?
I have a stream of 75 m3/hr of wood chips that need to be "cleaned". ■