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We have been manufacturing gold separating and gravity concentrating equipment for over 20 years.
Our modern improved gravity concentrating tables are superior to: centrifugal separations, centrifuge bowls, spiral concentrators, spiral separators, screw concentrating trommels, screw separating tubes, sluice boxes, gold pans, etc. U-TECH is dedicated to producing the ultimate gravity concentrating equipment on the world market.
Spinning rare earth magnets are placed underneath the deck surface of a U-TECH concentrating shaker table. An ABS plastic (truck bed liner material) one piece molded riffled deck and launder tray is incorporated into the RP-4 gold shaker table. U-TECH gravity concentrators will recover 99% of microscopic gold from your magnetite concentrates and is Designed to run continuously ". Competitive tests with drum magnetic separators, spiral separators, concentrating bowls, gold centrifuges, vanners, micron tables, static charges, etc., prove the RP Gravity Concentrating Tables to be superior in speed, recovery and economics. RP-4 mineral concentrating tables are factory designed with a raised riffle for maximum recovery of micron sized gold and platinum metals. A small compact tailings thickener introduces tailings feed at a controlled velocity in a horizontal feed design that eliminates the conventional fee-settling zone. Use 65% soda ash, 25% sodium silicate and 10% sodium hexametaphosphate as a "DEFLOCCULANT". Minerals or substances that differ in specific gravity of 2.5 or to an appreciable extent, can be separated on shaker tables with substantially complete recovery. No established mathematical relationship exists for the determination of the smallest size of concentrate particle and the largest size of tailing particle that can be treated together. Generally speaking, the riffled portion of a shaker table separates coarse non-sized feed material better than the un-riffled cleaning portion.
The PVC distribution bar is pre-drilled with individual water volume outlets, supplying a precision water flow. At some point on the concentrate end of the RP table, separation of middling and concentrate must occur. A live bed nugget trap is molded into the tailings drain trough and will save all oversized gold that will not pass the submerged deck screen.
Remove two shipping screws and washers from the front mounting feet of the Concentrating Table. WARNING: Do not remove ground plug or use any electrical outlet that does not have a properly grounded outlet. The SMST is the most widely used and successful gravity shaker concentrating table used world wide by small and large mining operations, and the hobbyist.
NOTE: Item maybe picked up locally if buying under these pretences, after you purchase, we will refund shipping costs or ask for an invoice with local pickup and we will eliminate shipping charge. An example of names includes: gold concentrating tables, gold concentrators, shaker concentrating tables, gold separating tables, gold shaker tables, placer wash plants, wash plant, gravel washplants with screens, heavy mineral wash plants.
Double deck wash plants will work on floating dredges processing rock sizes up to 4 inch in size. This was achieved by combining the worlds most used and successful gravity concentrating table, with a "unique" reverse polarity magnetic separator. 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.
RP-4 shaker concentrating tables will process up to eight hundred pounds or more per hour (average 400 lbs.
We have users claiming the U-TECH heavy mineral concentrators are saving down to one micron.
Place a level on top of the lower steel bar that extends between the two bolts that hold down the mounting feet. Sometimes up to fifty percent of the smaller gold will float to the surface and into the tails. A difference in the shape of particles will aid concentration in some instances and losses in others. Other factors, such as character of feed material, shape of deck and volume of cross flow wash water will alter the final concentrate.

Upon entering the non-riffled cleaning plane, small gangue material will crowd out and force the larger pieces of gold further down slope into the middling. Water volume adjustment can be accomplished by installing a 1" mechanical PVC ball valve for restricting the flow of water to the water distributing holes. Small changes in the volume of feed material, wash water, deck slope and other factors will affect and change the concentrate line formed on the cleaning plane, thus requiring attention. For most operations this method will never be practiced, but for a few this method could save the mill operator thousands of dollars.
ABS deck should be periodically cleaned with hydrochloric acid (swimming pool acid) (do not use paint thinners or ketones.
A small amount of grease should be applied to the adjustable T handle which is used for changing the slope of deck.
Two small rubber Eureka RD upright vacuum cleaner belts which drive the magnets should be changed between six months to one year.
To replace the larger round belt (buna o ring) which drives the upper magnets just roll the belt over the top of the magnets.
The patentedtable is designed for separation of heavy mineral and gemstone concentrate down to 1 micron size. Magnetite has the ability to create more magnetism than the applied magnetism and will align their magnetic poles with each other in long chains.
Dense concrete or solid bed rock is preferred or a heavy braced steel table sitting on concrete.
Use flat washers installed under either end of the mounting feet for precise level adjustment in the long axis.
Buckets, barrels or any deep containers with turbulent water will not allow slimes to settle. Generally speaking, flat particles rise to the surface of the feed material while in the presence of rounded particles of the same specific gravity.
When cleaning nugget trap, the wash water and table deck should continue to operate with the head feed material shut off. And with a small generator and water tank , no location is too remote for its use, ask us about custom applications you might need. With the factory installed deck screen the RP-4 gold separating table will operate as a shaker screen, a magnetite separator and gold gravity concentrator.
Tailings should discharge into a tails pond or into a primary holding vessel before entering slime settling ponds. Particles of the same specific gravity, but varying in particle size, can be separated to a certain extent, removing the larger from the smaller, such as washing slime from granular products. Pulverized rod mill pulps for gravity recovery tables should not exceed 65-minus to 100-minus 95% except where specific gravity, size, and shape will allow good recovery.
More water at the head end and less water at the concentrate end is the general rule for precise water flow. Hand feeding is tedious and one can not feed at a continuous rate, which will cause the concentrate line to change continually. Most minerals respond to humidification of particle surface by atoms, ions or compounds from aqueous phase, by aiding selective sorption of collector agents.
Wade and has revolutionized placer concentrating equipment and the minerals concentrating equipment.
The submerged deck screen is just one of many new and innovative techniques incorporated into the new line of U-TECH heavy mineral concentrators. Vibrations or harmonics will have a negative effect on the concentrating action of the gold and a negative scattering effect. Under flow from the thickener (60-65% solids) is processed through a vacuum filter and a 90-95% solids are sent to the tailings area. Mill practice has found it advantageous in having the concentrate particles smaller than the tailing product.
Recovery of precious metals can be made when processing slime size particles down to 500-minus,ifthe accompanying gangue is not so coarse as to require excessive wash water or excessive grade to remove the gangue to the tails. It is recommended that a 16-minus or smaller screen be used before processing inch or smaller feed material, is factory installed onto screening devices.
More feed material will occupy the head end of the shaker table deck in deep troughs and less material will occupy the concentrate end on the cleaning plane. Slope or grade must not be so excessive as to cause the concentrate to be scoured out and washed too far down slope.
After the remaining tails material has moved off and out of the nugget trap, stop the water and reciprocating action of the table.

Small heavy magnetite particles will crowd out larger particles of flat gold making a good concentrate almost impossible with standard gravity concentrating devices. Perfect screen sizing of feed material is uneconomical, almost impossible, and is not recommended below 65-minus. A normal water flow will completely cover the feed material over the entire table and flow with no water turbulence. For the RP table, inch down slope per running foot from level (measuring from the underside of the steel frame of the machine to the mounting base) will be a good starting point for most black sands operations. A slope T handle adjusting screw on the RP-4 and an automatic leveler on the RP-4 is located at the concentrate end of the table.
The remaining heavy material should be hand washed out of the nugget trap, into a gold pan or, etc., and inspected for values. Air bubbles attach themselves to the oil coated mineral to floated and will form a froth at the surface.
TheSMST 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. If you want to save micron sized gold, remove all harmonics from the oscillating shaker table. The RP table,using magnetics, overcame this problem and sends the magnetite into the tails, leaving the non magnetics to concentrate normally. Once settled, 400-minus to 500-minus gold particles are readily moved and saved by the RP shaker table head motion. A rubber wave cloth is installed to create a water interface and to smooth out all water turbulence. Excessive slope overloading of feed material or no wetting agent during operations, will result in fine gold trapped in the nugget trap.
This froth can be dispersed into the tailings or with the use of pipes and air jets they can be discharged into the concentrate bins. Lime will clear the water more effectively then soda but will not dissolve the clays as well. Over sized feed material will require excess grade to remove the large sized gangue, thus forcing large pieces of gold further down slope and into the middling.
Excessive slope, shallow turbulent water and no wetting surfactant account for 99% of all gold losses when operating shaker tables. Middling will always contain some values and should be re-run if operating at a high volume or the concentrate line was split too close.
Continued operation of the table with water, during cleanup of nugget trap without a protective cover of sand in the nugget trap, will result in some fine gold being scoured out of the nugget trap.
Save at least 1inch of the top concentrate line into the #2 concentrate pocket on the first run. Large gold nuggets will withstand the normal flow of water in the drain trough and will not be scoured out of the nugget trap. Close screening of the concentrate into several sizes requires less grade to remove the gangue and will produce a cleaner product. A shallow turbulent water flow without the wave cloth, no deflocculant or wetting agent and excess table grade will wash the gold further down slope and into the middling. A more economical method is to screen the head ore to screen size, 16-minus or smaller and rerun the middling and cons to recover the larger gold. This concept can be used on the RP tables and will recover all the gold with no extra screens. A general rule for good recovery is less grade for the table deck and as much wash water as possible without scouring off the fine gold.
Oversized gold that will not pass through screen size mounted on RP tables, will be saved in the nugget trap.
On the first run, at least one inch or more of the black concentrate line should be split out and saved into the #2 concentrate bin. Argentite silver will be gray to dull black in color and many times this product would be lost in the middling if too close of a split is made.

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