General introduction of Concentrating Table/Shaking Table:
Concentrating Table/Shaking Table is a mine selecting machine for fine materials working by gravity. It is widely used in selection of Tin, tungsten, gold, silver, lead, zinc, tantalum, niobium, iron, manganese, ferrotitanium and coal. Our company has long history of table concentrator production; we provide variety of table concentrators with high processing capacity, high recovery rate and high enrichment ratio.
Working Principle of Concentrating Table/Shaking Table:
The table is comprised of a deck, in somewhat of a rectangular shape, covered with riffles (raised bars running perpendicular to the feed side of the table), mounted in a near flat position, on a supporting frame that allows the table to slide along the long axis of the table.
On a table, with particles of mixed densities, layers of material form, a particle in suspension will be subjected to a greater force the nearer it is to the surface of the water, and will cause it to tumble over those at greater distances from the surface. The combination of the particles tumbling and sliding, the flowing stream with differing velocities, will cause the bed of solids to dilate, and will allow high SG particles to find their way down through the bed of light SG particles, and eventually the low SG particles will work their way to the top, where they will be carried along by the swifter flowing water. In all gravity separations, a difference in specific gravity of the materials needs to be significant, at 1 or greater. I.e., a 2.2 SG material will usually separate from a 3.2 SG material.
Main Features and Benefits of Concentrating Table/Shaking Table:
How efficient is a gravity concentrating table compared to a gold pan? Well, using a full sized table with 64 square feet of working area, a average bed depth of ? inch, with a average SG of solids of 1.7, and a packing factor of 0.60, there is 100 pounds of ore on the table at any given period of time. The average residence time of ore on a table is 7 minutes for 100 pounds of ore. Most gravity tables have a sand deck for treating 1/8" to 80 mesh material and a slime deck for treating -80 mesh material. The appropriate deck should be used when treating ores. Most used involve the sand deck.
Now, for a gold pan, a very good panner can take a pan with 15 pounds of ore in it and pan it in 10 minutes. That is 1.5 pounds per minute, versus 100 pounds in 7 minutes, or 14.3 pounds per minute. The table is 10 times faster than a gold pan using theoretical situations. In reality it is more like 20-30 times more efficient than a gold pan. In gold and mineral applications, a full sized gravity table, like the No. 6 Deister Table, will handle 1 ton per hour of sand feed, and less for slime feed, sometimes only 1/2 TPH.