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Author Topic: Portable Gravity-fed Fluid Bed concentrator...  (Read 237 times)

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Offline DharmaSoldat

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Portable Gravity-fed Fluid Bed concentrator...
« on: November 29, 2018, 09:42:58 AM »
Hi guys,

I had in mind to build a small gravity fed concentrator that I could take out in the field with me after seeing https://www.youtube.com/watch?v=fw25MdZbWh4 recently.

My initial plan was to have a large rubbermaid storage tub feeding into an array 1/2" PVC tubes in a smaller bucket probably a foot square via a 2" hose. The idea was to use another pail to repeatedly fill the bus tub to keep the flow up and let it do its thing over time.

Anyone have experience building a unit like this? I can do all the calculations I want but wondered if there was any experience out there I could draw from.

Cheers!

Online mcbain

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Re: Portable Gravity-fed Fluid Bed concentrator...
« Reply #1 on: November 29, 2018, 07:05:15 PM »
Question#1 is it worth all that effort.a simple clean up sluice and good panning will eliminate another toy.That is not needed.I learned a long time ago that all the small time toys are just that.They eventually end up collecting dust some where.Luck Mcbain.
I started out with nothing Istill have most of it.

Offline sunshine

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Re: Portable Gravity-fed Fluid Bed concentrator...
« Reply #2 on: November 30, 2018, 03:52:21 PM »
Somewhere in my garage is a Bazoka Gold Trap underwater dredge that follows the same principal.  It works OK but has a classifier, so material larger than 1/4 inch is not allowed in the trap. 
See my YouTube channel for fun amateur video:
https://www.youtube.com/channel/UCnz8kX6AZOeZbRt0F9XqVJA

Offline beav

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Re: Portable Gravity-fed Fluid Bed concentrator...
« Reply #3 on: December 01, 2018, 05:40:12 PM »
What size is your Bazooka dredge, Sunshine?

Offline DharmaSoldat

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Re: Portable Gravity-fed Fluid Bed concentrator...
« Reply #4 on: December 01, 2018, 08:36:15 PM »
Well McBain you know I can't resist building gadgets. It's mostly for fun and I don't see myself doing anything than ultra-small time anyhow so why not enjoy tinkering?

For when my back hurts though (my friend Sy Attica shows up more regularly as I get older) I was considering having it to concentrate without a lot of panning - sometimes that 15" is heavy and there's nowhere good to sit/squat.

Online mcbain

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Re: Portable Gravity-fed Fluid Bed concentrator...
« Reply #5 on: December 02, 2018, 07:30:57 PM »
Hi.D.S. I understand.You should come visit me next spring.Be fun too see if 2 old farts can have some fun.Luck Mcbain.
I started out with nothing Istill have most of it.

Offline geezir

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Re: Portable Gravity-fed Fluid Bed concentrator...
« Reply #6 on: December 03, 2018, 11:38:37 AM »
Do an internet search for "mineral separation by classification"
The separation of minerals into two or more products on the basis of the velocity with which the particles fall through a fluid medium (air or water) is called classification in mineral processing. The rate of fall depends of size, shape and density. The stratification in a pinched sluice is one example. The procedure can also be used to remove lights like clay slimes.  If you get the Wentworth grain size chart from United States Geological Survey it has settling velocities for various size particles of granite spheres.
For a gravity model pvc or abs tube with water flow into the bottom and a wye for feed should work.  Tee out into a pail to catch the fines with an over flow to your water source.

Offline geezir

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Re: Portable Gravity-fed Fluid Bed concentrator...
« Reply #7 on: December 07, 2018, 08:29:28 PM »

 


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