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Author Topic: Water Column Separators  (Read 18759 times)

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ClickTheYellowChick

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Re: Water Column Separators
« Reply #10 on: March 27, 2009, 05:50:44 PM »
Interesting, and so simple.

Is this the same type of idea as the gold rocket on the Rotapan site?  but without the bells and whistles?

http://www.rotapan.com/

Well, I swan.  I've been looking at that contraption for over 2 years now, and wondered what the heck it was. 

It wasn't until tonight when I watched the "new video prior to shipping to Indonesia" on that rocket URL you provided that I heard the word, elutriation, and understood what I was looking at.

Can't say a whole bunch for the pulsating water sourcing in that upper bowl as demonstrated in the video'd functionality test.  But maybe that was just a camera jiggle.  However, I'd swear I HEARD pulsating water in that drinking fountain looking upper bowl.

Thanks for bringing that up, GoldFever.  I sure like my under a $100 unit better than his $2500 priced unit...and in Aussie $$ no less. :o  'Course, I don't claim a 1/2 ton per day throughput either. lol!!!@*

Thanks for that URL and the opportunity to learn about that "rotapan rocket" device.  I like the Rota-Pan unit, and have one.

Offline Greg in BC

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Re: Water Column Separators
« Reply #11 on: April 01, 2009, 12:39:32 AM »

 Do you then dump of the lights or do you keep running with the lights stacked in the tube?
RESPONSE:  Well, since I'm a curious creature, I can't stand not checking between batches.  <-yahoo_> Doesn't take much gold to make me feel like queen of the anthill, so, I usually dump in my awaiting goldpan,
and dump in the next batch in a 1/3 to 1/2 cup increment. 

Megan, am I reading this wrong - does your unit hold 1/3 to 1/2 cup of material in total at a time or is that just the most efficient amount you add until it is full? In my mind I had pictured it holding something like 1/2 gallon of material in each batch.

Offline GollyMrScience

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Re: Water Column Separators
« Reply #12 on: April 01, 2009, 10:46:28 AM »
I think mine holds about 6 cups by volume but it isn't the volume it holds its the gold it keeps. As a displacement system you can keep adding material until the system starts to have problems with keeping gold. As with any displacement system - including a sluice the system will hold the same volume of material whether you run it for five minutes or five hours - the concentration ratio just gets higher and higher. More gold in the same volume. As with any displacement system however there will be a point where the system can't deal with the build up of heavies and at that point the system must be cleaned out in some way or another. With this elutriation column you can suck out the cons from the bottom periodically and not have to shut it down or you can suck the obvious light weight material off the top and then dump out the cons - if you do that then the light weight material you sucked off the top will be the first stuff fed into the system at next startup to make sure you get all the gold. You can also just pour the entire thing into a container and deal with the lower concentration ratio.
What the heck - lets just keep mixin' stuff together till it blows up or smells REALLY bad!

Offline Traveller

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Re: Water Column Separators
« Reply #13 on: September 05, 2010, 06:18:10 PM »
Hello
I joined this site recently after discovering there was discussion about e-towers here. I have long sought one but with no success.
There is another device that was marketed by Action Mining Services in the late 1980's and possibly early 1990's. It was called the Hydrostatic Vertical Table and was, I believe, a variation on the e-tower principle.  It was a rather flat device and consisted of a vertical column of water maybe 15 cm wide and 2-3 mm thick and 30 cm tall. It was all made of plastic and the face was clear, allowing the operator to see particles in the column. Water was regulated and introduced close to the bottom and black sand/ gold concentrate was metered through a slit at the top. The operator watched the black sand and gold particles falling through the flat column of water and gently opened the flow of water until the black sand particles stood still in suspension and the gold particles fell. Further opening of the valve moved the black sand particles up the column, past the infeed slit and to a waste portal. There was no chance of overloading the infeed water with gold as the gold particles dropped below the water infeed portal to a catch cup below it.
This device, according to Action Mining Services, had the distinction of being a gold separator and not a gold super concentrator.
Action Mining Services discontinued this unit many years ago in favor of a range of shaker tables they now market. I offered to purchase a set of plans from them for the HVT but had no success.
Does anyone recall this machine and possibly know where to purchase a used one? I would even attempt making one if someone had the specs.
Thanks
Bob
"He was always cold, but the land of gold seemed to hold him like a spell.......Though he'd often say, in his homely way, that he'd "sooner live in Hell"......"
~~Robert W. Service~~

"When you live next to the graveyard, you can't cry for every funeral."   -  Russian Proverb

Offline GollyMrScience

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Re: Water Column Separators
« Reply #14 on: September 05, 2010, 08:13:58 PM »
I remember the Action Mining unit. Played with one for awhile but needed to classify on very narrow splits to get the action right.
The e-towers need careful classification as well to get optimum performance. Ultimately many people fond that a Miller type table will do a good enough job and not be as picky on classification - though it does need some. This is based on small scale operation. Larger scale heads for vibrating tables of some sort as an alternative.
What the heck - lets just keep mixin' stuff together till it blows up or smells REALLY bad!

Offline Traveller

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Re: Water Column Separators
« Reply #15 on: September 05, 2010, 11:10:12 PM »
Hello MrScience
Thank you for responding. You are one of a handful of people who actually remember the Hydrostatic Vertical Table.
The HVT was definitely made for small scale operations. I can't recall the actual per hour throughput volume but I know it was not very much. However, this suited me just fine as the placer deposit I am working with is a very rich concentrate and not much material has to be processed. It is a beach placer deposited during storms. Very rich but also very VERY fine gold that just happens to be of a flaky nature as well. Hence, my interest in e-towers, as little else seems to work in gold this fine and quantities so small.
You mentioned a Miller table. I don't think I am familiar with this unit. Does it actually separate gold from black sand? Can you provide me with a link to a site for it?
Thanks
Bob
"He was always cold, but the land of gold seemed to hold him like a spell.......Though he'd often say, in his homely way, that he'd "sooner live in Hell"......"
~~Robert W. Service~~

"When you live next to the graveyard, you can't cry for every funeral."   -  Russian Proverb

Offline GollyMrScience

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Re: Water Column Separators
« Reply #16 on: September 06, 2010, 08:56:13 AM »
Bob the e-towers are/were one of those ideas that just seemed so logical on paper but in application did not fare so well. Adding gold to the top of a column of lifting water creats float gold potential like crazy, the bed ends up puffing and channelling and gold keeps getting thrown to the upper layers and a host of other technical challenges. If it were just silica sand and gold life would be easier but the black sands in there add a variable that really gums things up.

In a related technolgy you might investigate inclined plate clairifiers. The application of the lamella design with the enhanced settling might get closer to merging the ideas of the e-tower and the hydrostatic table ideas. Something for the winter project lists.

If you do a search on this site there should piles of ideas on the miller table. There is also the commercially made version. For primary concentration they are way too slow. Meant to get the gold out of high grade cons.

How much material do you want to run at a time? Hand shovel? Just skimming the concentrate zones along the beach?
How portable do you need the equipment to be?
Do you have a rough idea on the size of the gold on average?
What the heck - lets just keep mixin' stuff together till it blows up or smells REALLY bad!

Offline drpop

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Re: Water Column Separators
« Reply #17 on: September 06, 2010, 09:54:23 PM »
will vibrating or stirring help stop the puffing?

Would this start being a simple jig?

Kim

Offline bakergeol

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Re: Water Column Separators
« Reply #18 on: September 06, 2010, 10:15:09 PM »
Excellent post GollyMrscience

I remember Lashley of ASAT (since passed away) did a lot of work on
on these separation towers back in the 80's.
 One problem  with getting a clean separation was that the water velocity was different
around the sides of the tube versus the center of the tube. You could have the correct
water velocity to remove the black sand in the center but not at the sides. Didn't he suggest
subdividing the column into many smaller columns to correct this or is my memory and old
age showing?
In addition,  the flatness factor  of gold versus the level of classification was always a problem.



George

Offline nuggetsucker

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Re: Water Column Separators
« Reply #19 on: September 06, 2010, 10:39:40 PM »
I've built and used 3 E towers so far .As Golly says they're more of a super concentrater than clean gold getter.
In my mind they are'nt worth the effort even doing close screening on fine gold .I would use either a shaking table
as first choice and most expensive or a miller table as the simplist and least expensive useing the KISS principle.
nuggetsucker

 


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