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centennial
09:08:37 Fri
Jul 24 2009

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RP4 Table

The RP-4 uses a unique reverse polarity of rare earth magnets which will cause the magnetite to rise and be washed off into the tails leaving just the gold traveling to the catch.
Any one know if this works.

  
NeilAK
09:57:49 Fri
Jul 24 2009

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Re: RP4 Table

I am very curious about how well this works.

  
centennial
10:31:39 Fri
Jul 24 2009

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Re: RP4 Table

Heres some more of the advertising, I have heard many good reports on the table but not much about how well the magnet setup works.
Spinning rare earth magnets are placed underneath the deck surface of a U-TECH concentrating shaker table. Reversing the magnetic polarity of magnetite at about 800 cycles per minute (Elliptical polarization of the magnetite) magnetite will rise to the surface of the feed material and will be washed into the tails by the transverse flow of wash water. Magnetite has the ability to create more magnetism than the applied magnetism and will align their magnetic poles with each other in long chains. This basic concept was invented by Darvin P. Wade and has revolutionized placer concentrating equipment and the minerals concentrating equipment.

  
Muley
16:42:37 Fri
Jul 24 2009

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Re: RP4 Table

I have owned and used a RP-4 table for years and I find that it works extremely well. I have found that my concentrates contain very small amouts of plats, I did not know this until I started using the RP-4 table.
Muley

  
baub
14:20:34 Sat
Jul 25 2009

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Re: RP4 Table

It helps to classify the cons first. Use a little less water flow for the finer stuff.
I've used it in the boonies by bolting it to a trailer and chaining it to two trees for stability. Used a genset and recirculated the water. Worked well.

b

  
aussco999
14:35:35 Wed
Jul 29 2009

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Re: RP4 Table

Hey Centennial:

Iíve owned and have used several RP-4 tables, (still using one in Mexico). For the price, they are a very good table. Theyíre more of a shaker table than a bump table, using an eccentric off-set to rapidly move the table back and forth. They have 3 spinning cross-blades located under the ABS/aluminum table top with several (rare earth**) magnets attached to each arm of the cross in an opposing polarity configuration. The 3 spinning blades are attached together by a system of pulleys and bands. And, FYI, when one of the bands breaks or dry rots, they can easily be replaced with the round (not flat) rubber bands from an up-right house-hold vacuum cleaner, and the table is powered by an off-the-shelf clothes dryer motor. (** How would you test for the difference between a RE and regular magnet???)

In theory (according to Mr. Wade), the black sands are suppose to jump up and down as each opposing pole of the magnets pass underneath. In reality, it all depends on the composition of the material you are feeding the table. For example, if your feedstock consist mostly of non-magnetics (blonds), some magnetics (blacks) and of course some precious metals, the table will give you a much cleaner concentration by pulling the blacks away from the heavier metals.

But, if your feedstock consist of a lot of magnetics, they overwhelm the table and recovery rates drop off. If your feedstock has a lot of sulphide, they also will separate nicely to the top drop. Iíve also noticed on my tables as they age, the centers of the spinning crosses becomes heavily magnetized, and will hold a big wad of magnetics at 3 center points on the table. I donít think that hurts separation as I use it as a guide point to determine the slope on the table to capture the middles. The rated capacity of the table is about 500 lbs/hr (227 Kgs/hr) of sand size material. A high volume of blacks and/or a smaller (-100 mesh) particle size can reduce the capacity greatly.

A few tips to successfully operate the RP-4. #1. Bolt the table down solid. For a small table, it will walk around if not firmly attached. #2. Make sure the mounting frame is level. You only have a simple slope adjustment on the table. #3. Pre-screen size and pre-wet your feedstock. It will separate better. Also, an automatic feeder comes in handy. Iíve often feed my tables with the under flow of a hydro-cyclone #4. Use the minimum amount of wash water, just enough to get separation and re-run the middles. #5. If you can afford it, buy several table and set them up in tandem. Your recovery rate will be very high. And #6. Once you get the table set up for your particular feedstock, tell everyone to keep their grubby little hands off of it. Donít let them change anything. The table will run 24/7, until something breaks. And that is as good as it gets.

Iíll probably remember more or even find the tableís operating instructions after I send this post, but this should be enough info to help your decision making process. Also, thanks a bunch for all of the videos of your hard-rock mining project. Keep us informed of your progress and good luck.

John

  
LipCa
15:14:25 Wed
Jul 29 2009

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Re: RP4 Table

I've used an RP-4 for many years and I did not like the way the spinning magnetics held the gold and actually caused it to move lower on the table.
I removed the magnetic units(replaceable if necessary) and just run it as a "shaker table". It works fine and works best if you remove the magnetics.
I guess it depends on your material and how you run it, but I've never found gold in the tails which would require an additional table. I don't find gold in the # 3 seperation either. I always re-run the #2(middle).
Unless you have a good water source. you need to set it up to recirculate the water.
[1 edits; Last edit by LipCa at 15:15:12 Wed Jul 29 2009]

  
gpg
16:55:52 Wed
Jul 29 2009

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Re: RP4 Table

They advertise seperation down to 1 micron size. How small are you guys processing? Efficiency at small size? And how low does the feed rate get for -100 mesh stuff? 100 lbs/hr, 50? Any info you could give me on 100 micron and smaller stuff would be appreciated.
Thinking about buying one, and i'm in AZ, I can go pick it up. Which I'm sure would be an interesting trip.
[1 edits; Last edit by gpg at 16:58:25 Wed Jul 29 2009]

  
LipCa
20:53:53 Wed
Jul 29 2009

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Re: RP4 Table

The smallest screen I use is a 30 mesh. And I seem to get everything down to powder.
I can do a first run a 5 gallon bucket of -30 in about an hour.

  
centennial
06:22:18 Thu
Jul 30 2009

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Re: RP4 Table

Thank you everyone for your replies, Ive never heard a bad word said about these tables and one is definately on my shopping list.
Thanks auscoo999 , I think its about time I made another video to show what weve been up to at the Centennial, probably will be in a month or so as Im just setting up to do some core drilling and get my little crushing and recovery set up going so Ill video that.
Cheers Laurie

  

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