Bentonite Clay Screening Tough
SOURCE: http://en.wikipedia.org/wiki/MainPage
Bentonite is an absorbent aluminium phyllosilicate generally impure clay consisting mostly of montmorillonite, (Na,Ca)0.33(Al,Mg)2Si4O10(OH)2·(H2O)n. Two types exist: swelling bentonite which is also called sodium bentonite and non-swelling bentonite or calcium bentonite. It forms from weathering of volcanic ash, most often in the presence of water.
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1. Which type are you dealing with, do you know?
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What I can tell you is you will NEED a very AGGRESSIVE action screener to deal with this type of hydroscopic type of material.
A large stroke operating a a fairly high G factor. Maybe a ball tray deck to keep the 1/2" OPENING unplugged and open area available. You would probably need a very special NON BLINDING self cleaning type of WIRECLOTH from one of many specialized wirecloth suppliers.
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Breaking up the conglomerated CLAY pieces could be worked out with a special LUMP BREAKING type of device overtop of the feed hopper to the screener.
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It would be very important to FEED this screener to its full width in a controlled manner, with a variable speed control on the belt feeder and a belt wide enough to feed the full width of the screener vs SURGE LOADING the screen with a troughed belt setup.
There are also very specialized IMPACTORS out there to handle this NARLY bentonite type of clay.....with moveable FEED PLATES to avoid PACKING and jamming the infeed openings.
Hope this of help...... ■
Re: Screening Wet Clay
Sorry for my terminology George; the oil and gas industry often uses the term of Bentonite for drilling mud additives. The material we're dealing with in a number of situations actually contains Attapulgite which is "a needle-like clay mineral composed of magnesium-aluminum silicate". Although the percentage of attapulgite is relatively small, it does create problems.
On one site that we have to remediate, the oil based drilling waste was mixed into the surface material in an attempt to “landfarm” the material and biodegrade the hydrocarbons but the process did not achieve the remediation criteria. This particular site was basically a pit run gravel with some rock (< 5%) over 6”.
Our goal is to remove all aggregate over ”; although this size isn’t cast in stone, but we would like to break up the remaining fines as much as possible.
I’m interested in hearing more about the impactors you referred to. Judging by your response, we are looking at a “train” of processing equipment and not a singular unit.
Russell Kossowan ■
Spindletop, Clay And The Stuff That Binds To Your Boots
If you get an impactor it will be quite messy especially if it plugs.
A wobble feeder feeding a wet single deck incline screen will help remove a lot of this and the resulting mud clay can be washed in to a very large rental mud cleaner and then screened off with desilting cones over the screeners and then using soda ash to remove the bentonite/dissolve it at the same time since you do not need to develope a wall cake to strengthen a mud drilled hole such as is needed in a mud drilled well for oil gas or water.
If you get a small screener a tow behind with a separate engine that rests on the ground after it is set up screens and throws over size away-over the side and dumps undersize right below the screen that will work too.
You will be money ahead getting a big rental mud cleaner if you need the job done quickly. that way you can screen and wash to the desired size with desilting cones pumping the wash water mud/ cuttings and clay over the desilting screens and screen off the rock - you can use soda ash to break up the clay and remove it in the wash water.
Soda ash will help you considerably with the clay in the spoil by breaking it up as it is a great water softener.
Adding Dawn dish soap to the wash water will break it up even more.
It all depends on the downstream end of your reclaim and pollution control/purification. I do not see you getting a way from using a lined pit and a large portable mud cleaner -semi trailer size due to the oil waste and its need to be pumped through a sewage treatment plant.
Dilution is the solution.
lzaharis ■
Screening At 1/2 Inch Opening
Nice Nice answer Izaharis.....very informative as usual.
Screening at 1/2" opening is really no problem......probably go around a 5'x12' screen with 2 decks......on a diesel drive portable plant with its own feeder onboard. Side conveyors and discharge overs chutes. Complete, slick, lots of shake and bake STROKE to really move the material.
1. Maybe run some quantity of STONES in with it.....to help scrub the 1/2" deck and actually maybe PULVERIZE the conglomerated clay lumps at the same time and the stones would be oversize rejected anyways.
2. Sorry ........ but, I know bentonite can be nasty stuff to screen at the best of times.
3. I am going to try to add a pic in here of a MUD HOG for wet or sticky clay or materials. It is actually a special designed MUD HOG or hammermill with a unique, special NON plugging feed conveyor as the primary detail for success. Sorry, not an impactor....I mispoke myself.
"Kinda of a sticky wicket" ■
Mudhog Pic
try adding pic again.......
(img)http://assinck.com/img/pictures/mudhog%20for%20clay.jpg(/img) ■
Re: Screening Wet Clay
Thanks for your response lzaharis - I would really like to avoid a "wet" proicess due to the limited space we typically have, the volumes of material to be processed, and the requirement for containment (Liners, Tanks, Etc.) ■
Screener
Originally posted by Russell Kossowan
Thanks for your response lzaharis - I would really like to avoid a "wet" proicess due to the limited space we typically have, the volumes of material to be processed, and the requirement for containment (Liners, Tanks, Etc.)
Would you be at all interested in a wet screener/mud cleaner that can be towed behind a pick up truck and is fully self contained?
I see no way around a two deck screen as george has suggested and a mud cleaner with your remediation clean up unfortunately as you will have the residual oils left from the remediation in any case unless you push it all through a rotary kiln to drive off/burn all the organic chemicals from the petroleum residue first and separate it after it has been cooked to burn off the volatile organics in the gravels.
If you screen down to 1/4 inch size the mud cleaner will do wonders for you with very little water and no pit as it is self contained with one suction sose and one discharge hose running back to the intake point where the rock/mud could be washed/driven by water pressure to the suction hose in a small portable pit.
The mud cleaner I am referring to is self contained and has its own desilting cones with a fine screener to eliminate the rocks, dirt and bentonite-you will not be able to get a way from using soda ash-dense or light for your bentonite removal
The soda ash will soften the water and aid it in breaking down the residual oils and adding the dawn dish soap will help the water tremedously to aid with the oil removal in all seriousness.
The unit he builds is completely self containedand cleans and delivers one ton of drill cuttings/rocks per hour at a minimum.
If you use the "Mud Hog" as my friend george has so kindly illustrated the washing and clean up will go even faster and the end result will give you a clean product with little water used.
The mud cleaner is available for rental or purchase and I can contact the man who builds them for you if you would like me to.
lzaharis@lightlink.com ■
Re: Screening Wet Clay
Izaharis - Thanks for all your efforts!
I would be interested in obtaining more information on the machine you are referring to, especially if the unit can be built to handle a greater volume. The problem I face is volume - One site has 65k cubic meters (gross) and approximately 35k cube of fines that has to be dealt with.
Just to add a little humor!
35k cube @ SG of 1.6 = 56K tonne
At one tonne per hour & Working 12 hour days, I'll be there 4666 days; I'm already old - not sure I have that much time!!! LOL ■
Re: Screening Wet Clay
George,
Do you have experience with the Mud Hog you referred to?
I would like to get some feedback from people that have these units. Repair & Maintenance issues, downtime, etc.? ■
Screening Puzzle
Originally posted by Russell Kossowan
Izaharis - Thanks for all your efforts!
I would be interested in obtaining more information on the machine you are referring to, especially if the unit can be built to handle a greater volume. The problem I face is volume - One site has 65k cubic meters (gross) and approximately 35k cube of fines that has to be dealt with.
Just to add a little humor!
35k cube @ SG of 1.6 = 56K tonne
At one tonne per hour & Working 12 hour days, I'll be there 4666 days; I'm already old - not sure I have that much time!!! LOL
how big is the area you are going to work in?
Send me your address and e-mail and I will send you a barge full of information and details on waynes mud cleaner. several firms make bigger units but waynes is nice simply because it is small and easy to operate.
I will send you infomation on several manufactures lines of machines to you so you can see what is available.
It sounds like you will need a semi trailer sized skid or wheeled unit but the beauty of these units is they can be rented or leased
and have their own power units too with a zero capital cost.
The larger units have huge suction and discharge sizes and cleans the mud quickly of rock cuttings and gravel and gives you clean fluid to reuse.
leon Z
lzaharis@lightlink.com ■
Re: Screening Wet Clay
My address is:
TR3 Energy Inc.
1250, 101-6th Ave SW
Calgary, AB
T2P 3P4
russell.kossowan@tr3energy.com ■
We Can Do It!!!
I'm surprised that Mr. Baker did not recommended on Kroosh Screen that will fit your needs.
We specialize in applications like yours.
Since we are producing a multi-frequency vibration onto the mesh, we reach accelerations of up to 2000G on the mesh, while maintaining a very low acceleration on the body of the screen that will have a very low amplitude. We have hundreds of screeners working around the world and our equipment is simple, purely mechanical and innovative.
For further knowledge please visit our site: www.kroosh.com
I believe we can supply you with screening equipment that will do the task with a clear cut point and may offer you to go finer if you wish.
We may use two units of ULS 2.3X1 screener (each has 2 square meter of screening area) or one unit of ULS 3.5X1.25 screener (with 4 square meter of screening area).
We have successful screeners that are working with high humidity material (20%-30%).
Please contact me for more details.
Best Regards, ■
Re: Screening Wet Clay
Do you happen to have another link to a picture of the MUD HOG? I'm interested in taking a look at it. ■
Mud Hog Experience
Only experience is that when I worked for DRESSER industries....(JEFFREY INDRESCO) they had a MUDHOG especially for narly clay.......in their EUROPEAN division.......England i believe.
It had a MOVING FEED PLATE......so you never plugged the infeed opening.....
I will dig a catalgue pic out of my files for you.
CLAYYYYYYYYYYYYY........aint fun. ■
Re: Screening Wet Clay
Re: Screening Wet Clay
Originally posted by Russell Kossowan
Currently looking for a deck screener capable of screening wet clays including some bentonite. Moisture content in some cases is very high >15% which makes the material difficult to screen.
Our goal is to remove all particles >1/2" and break down clay lumps to maximum of 1/2"
Would like a machine capable of screening up to 80 cubic meters per hour.
Any suggestions would be appreciated!
Russell
Dear Russell
Just to cut it short for now, we Manufacture Twin Roll Mineral Sizers, If I were you I would use a Twin Roll Mineral Sizer, these units can handle and Size wet Sticky materials including Clay, upto and well in excess of 80 TPH.
We can supply New or Used Mineral Sizers.
We are also probably the most competatve supplier of Mineral Sizers on the Market, given that we manufacture in China, although we do import our Gear Boxes in from the UK at this time from TRM Ltd (an affiliate of ours), who also manufacture Twin Roll Mineral Sizers and Shredders. web www.trmsizersandshredders.com
Should this be of interest, please contact me the following.
Kind Regards
Lee Pickard
Tel +86 13621 956627
Email lee.pickard@gmail.com
Email beckerfieldholdings@gmail.com ■
Re: Screening Wet Clay
Dear Russell
Just to cut it short for now, we Manufacture Twin Roll Mineral Sizers, If I were you I would use a Twin Roll Mineral Sizer, these units can handle and Size wet Sticky materials including Clay, upto and well in excess of 80 TPH.
We can supply New or Used Mineral Sizers.
We are also probably the most competatve supplier of Mineral Sizers on the Market, given that we manufacture in China, although we do import our Gear Boxes in from the UK at this time from TRM Ltd (an affiliate of ours), who also manufacture Twin Roll Mineral Sizers and Shredders. web www.trmsizersandshredders.com
Should this be of interest, please contact me the following.
Kind Regards
Lee Pickard
Tel +86 13621 956627
Email lee.pickard@gmail.com
Email beckerfieldholdings@gmail.com ■
Screening Wet Clay
Currently looking for a deck screener capable of screening wet clays including some bentonite. Moisture content in some cases is very high >15% which makes the material difficult to screen.
Our goal is to remove all particles >1/2" and break down clay lumps to maximum of 1/2"
Would like a machine capable of screening up to 80 cubic meters per hour.
Any suggestions would be appreciated!
Russell ■