Re: Screening Crushed Glass
You are already anticipating probable vibrating screen behaviour towards broken glass. If the shards are sharp enough to blind the aperture then they should be easily toppled by a screen with sufficient vertical stroke. Only tests will tell & they are out of the question. There is also a possibility that eg a bottle bottom has 3 prongs which lodge into 3 apertures & then your screen is really stuffed.
Have you considered wedge wire screens, eg Johnson, Euroslot or Trislot to name a few? Easy (self) cleaning & no machinery: except perhaps a fixed rake for the really unco-operative shards.
MMD, Somercoates, Derby UK made a crusher which sucessfully crushed reinforced window glass to recover the steel mesh almost unscathed. Such a machine would not be economic for bottles & jars (nip) so I fall back to Wedge Wire Screens. ■
John Gateley johngateley@hotmail.com www.the-credible-bulk.com
Re: Screening Crushed Glass
Hi JD
I would suggest that a horizontal, linear stroke screen with a deck that utilises a bar or rod screening media would solve any pegging problems that may occur with crushed glass that has jagged edges. Dont overdo the stroke as you will just fling the glass off the media surface, this will reduce the time that the glass has to "see" the aperture and reduce the screening efficiency.
Dave ■
Re: Screening Crushed Glass
This is dewatering, not screening proper. What the fractions are is unimportant. For wedge wire screen you can also read sieve bend. ■
John Gateley johngateley@hotmail.com www.the-credible-bulk.com
Re: Screening Crushed Glass
OK, to eliminate all labor.. why not mount the crusher above a small sand washer? add a little water and have a product to sell . in our area crusher glass is used for pipe bedding , contractors are usually waiting in line to get it . ■
Re: Screening Crushed Glass
John, thanks for the suggestion on wedge wire. We were thinking about tapered grizzly bars but for the grizzlies we are used to there would not be enough open area, the wedge wire seems to solve this.
Dave, appreciate the suggestion about the stroke, but would actually like to bounce it a bit to shake off as much liquid as possible.
Kasey, I didn't mention the containers have a lot of "unknowns" inside, and probably can't be washed effectively. What part of the world are you in, I have never heard of crushed glass being used as pipe bedding. It must have to be tumbled first or it would have a lot of sharp edges in it.
Thanks to all, will let you know how it turns out if the project goes ahead. ■
Crushing Screening Glass
Hello: Dealing with slivers is also a problem when trying to pass a clear opening in any type of media.
I assume you are using a jaw type crusher? This type of crusher actually produces shards, slivers, arrowheads (pick a name you like) and these by nature PEG the square opening.
Impactor: An impactor with abrasive resistant ceramic or double ceramic abrasive resistant impellers will produce a CUBICAL or angular product vs slivers. The prime determing factor would be operating wear cost. IF too high, not feasible.
Now, if you could produce a cubical product then, the screening PEGGING problem of course is GONE. Cubical shapes screen very nicely.
For screening highly abrasive material, a natural pick for slide wear is URETHANE screen panels with 1/2" square openings and I assume you will be washing the sticky liquids off the deck or no?
Is it a problem if the glass is BLOWN down to powder or do you need to maintain a certain SIEVE gradation?
YOU could easily screen this on a circle throw, 20 degree incline screener, no problem with the proper speed and stroke.......in this case it would be nominal 1/4" circle size running at 1000 rpm range. This will stratify the material the proper height to allow the fines to pass BUT, not enough to have the fines STRATIFIED too high and stop them from getting down to the opening and pass.
A 45 deg horizontal screen stroke or flat screen would work too and be excellent for washing and dewatering but, MUCH BIGGER DOLLARS and no gravity helping. You could test it easily at any number of vibrating screen manufactring companies and confirm it will actually work. WE do this all the time, no big deal. ■
Re: Screening Crushed Glass
Dear Mr. JD,
It seems your aim is to remove the liquid content of the bottle and for that actually you want to break the bottles. So, one option could be to break / crush the bottle to the largest permissible size and drain out the liquid at the discharge end of crusher by having wire mesh / perforation in the inclined bottom plate of the chute. Then this will provide glass with minimum moisture content. This glass could be further crushed to the required size, which would have bare minimum moisture (liquid content). Will this not be better? It is not clear why you intend to have screening.
In a glass plant, the rejected glass is again fed into glass furnace. This is simply crushed by two big size rollers (mill stone), rotating on a central pivot and crushing surface is horizontal. The glass so crushed is conveyed on the belt. The overhead magnet and magnet pulleys effectively removes the wire pieces from such crushed glass. This was the arrangement in glass plant where I had worked long time back.
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 ■
Re: Screening Crushed Glass
Mr Mulani
Thank you for the information on glass plant practice.
We are proposing to screen the glass because some of the bottle contents will be viscous liquids, and some will be powders. We feel that shaking across a screen will be beneficial to removing the contents from the glass. There is also consideration being given to using spray nozzles above the deck to rinse off some of the liquids.
It is important to remove most of the contents as they are classified as hazardous and the glass cannot be recycled. The volumes to be handled are large and there will not be enough room to let them sit to drain as we have done in other applications.
Mr Baker
Thank you for your suggestion, but we want as few glass fines as possible suspended in the liquid for pumping reasons. The urethane suggestion has been considered. I think we are going to consider the first set of screens "disposable" until we get some operating experience.
Thanks to all for the suggestions. ■
Trommel Screen
this type of application is also quite frequently done with a small trommel rotating screen with spray bars inside. ■
Re: Screening Crushed Glass
A follow up note to let all contributors know how this project proceded.
After much consideration, it was decided to forget about screening and discharge into 2 yard containers where a small amount of liquid would be sprayed over the top of the pile as it was filled. A port in the bottom of the container would drain off liquids.
When the container is full, it will be replaced with an empty. The full container will be left to sit and drain for a day or so. A sort of containerized "heap leach system". Very passive, low wear and low maintenance.
Thanks again for all the ideas offered. ■
We Can Do It!!!
Dear J D,
Please indicate you feed capacity and particle size distribution.
Then I'll be able to provide you with our screening solution.
We can work with perforated plate or nylon meshes.
Due to our multi-frequency vibration system, our meshes won't blind. We apply variable acceleration onto the mesh that will reach up to 2000G, while the body of the unit will remain with a very low amplitude. Those high accelerations will provide a self cleaning effect and maximum screening efficiency.
We have experience screening most abrasive material as well as non-screenable materials (all around the world), therefore I'm sure we'll be able to provide you a screening solution.
For any further details, you can visit our site: www.kroosh.com
Or
Send me an email: mandil@kroosh.com
Best Regards, ■
Wedge Wire Screen
Dear Sir/Madam,
I am from haixing company.We are a major manufacturer of high quality wedge wire screens in various shapes and sizes equipped with modern machines and latest technology.
Our Welded Wedge Wire Screen provide a unique combination of the most important features required for maximum screening efficiency.The product is custom designed to suit the specific requirements of the customer and to enable a relatively low cost and high performance solution for the screening application. The high open area of the Wedge Wire screen provides excellent capacity.Wedge Wire screen offers continuous slot openings that widen inwardly so that particles tend to pass through the screen.
Typical application areas
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Features
Non-clogging capabilities
Self supporting
High abreaction resistance
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Material
VLCS-varnished Low Carbon Steel
Galvanized steel
AISI 304 Stainless steel
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Other materials available upon request
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Separating
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filtering
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If you have interest in our screen pipe or screen panel,please contact us.We shall be glad to receive your kindly enquiry.
Best Regards,
Bob
Haixing Filter Company
No.2589 West Shengli Road
Development District,
Hengshui,Hebei,China
Tel: 0086-318-7086815
Fax: 0086-318-7086812
Email:info07@haixing-filter.com
info@haixing-filter.com
MSN:haixing.07@hotmail.com
http://www.haixing-filter.com
http://wrt-belt.com ■
Screening Of Crushed Glass
We are involved with a company called Krysteline who have done this before. Their contact is Steve Whettingsteel on 07798 867170.
Rotex are specialists in screening & have recently sold a number of machines to screen crushed glass. Obviously the wet product can be a problem but it all depends on what you need to screen at. We can test to determine the desired result.
Phone me on 07788 105174
Regards
Allan Thompson
Rotex ■
Screening Crushed Glass
We are developing a project to crush glass containers in order to extract the liquid contents and reduce the volume for disposal. We have sucessfully done this before with a crusher putting out a product size of -1/2" to fines and screened through fixed manually cleaned screens.
In this case the volumes are high and we want to look at using a vibrating screen to pass the liquid and fines through the deck and be funneled into a drum below. The large fraction would be discharged off the end. Fines in with the liquid can be settled out in a pump box and manually removed occasionally.
I am looking for any advice on screen construction and selection. We were thinking quick change perforated plate screen panels as abrasion will cause accelerated wear. We are also concerned that slivers of glass may stand up like soldiers in the deck holes similar to screening shredded wood.
If anyone has attempted this before, the voice of experience would be appreciated. ■