shaking table gold shaking table for sale gold shaker table

shaking table for sale with best price - ftm machinery

shaking table for sale with best price - ftm machinery

The shaking table is a gravity beneficiation equipment for selecting fine materials, such as the tin, tungsten, gold and silver, lead, zinc, antimony, bismuth, iron, manganese, ferrotitanium and coal, etc.

The shaking table is a gravity beneficiation equipment for selecting fine materials. When the gold shaking table in action, the effective particle size range of metal ore is 3~O. 019 mm. While it processes the coal, the upper limit granularity is 10mm. The outstanding advantage of the shaker is that the sorting precision is high, and high-grade concentrate or waste tailings can be obtained by one sorting, and multiple products can be taken out at the same time. Besides, the shaking table is easy to adjust.

Mining gold shaking table is a common mineral processing equipment for sorting fine ore. When the metal ore is processed, the effective particle size range is 3~O. 019 mm, the upper limit particle size can be up to 10 mm when coal is selected. The outstanding advantage of 6-S shaker is the high precision of sorting. High-grade concentrate or waste tailings can be obtained by one selection, and multiple products can be taken at the same time. The flat 6-S shaker is easy to handle and easy to adjust. The main disadvantage is that the equipment covers a large area and the processing capacity per unit of the factory area is low.

Shaking table is widely used in many industries, and can be used for rough selection and sweeping of materials. Its main materials are various metals and heavy metal materials such as gold, silver, zinc, tungsten, iron, manganese, lead, coal, etc. The size of coarse sand is 2-0.5mm, and the fine sand is 0.5-0.074mm. The effective recycling range of shaking table is 2-0.22mm when processing the tungsten, tin and other metal ore materials.

The gold shaking table is made up of table surface, main frame, transmission device and motor. Moreover, the gold shaking table will be armed with the water filling chute, feeding chute and engine base.

The motor of the shaking table drives the crankshaft to rotate the rocker through the belt and then moves up and down. When the rocker moves downward, the mineral material enters through the mining channel on the inclined surface. Shaker sink provides lateral impact water.

The material with different specific gravity, particle size, and density flushed with rinsing and will be selected and output from the concentrate mouth of shaking table, and the tailings mouth. Thus, the processed ore is the high-quality concentrate. However, because of the replacement of mining gold shaking table, FTM Machinery, as the gold shaking table supplier, had improved a lot in term of its throughput and accuracy.

4.After checking the installation connections, the empty shaking table runs for 1-2 hours to check whether the bed surface is running smoothly, whether the connection is loose, shaking or sliding, whether the lubrication is good, and 2whether the lateral slope adjustment is flexible and stable.

6.If there is no problem with empty shaking table, you can put the ore there. according to the ore transportation and zoning on the shanking table surface, adjusting the ore concentration and concentration, stroke, cross slope and flushing water volume, etc.

shaking table|gold shaking table for sale|gold shaker table|shaking table price-ore dressing machine - henan fote machinery co., ltd

shaking table|gold shaking table for sale|gold shaker table|shaking table price-ore dressing machine - henan fote machinery co., ltd

As a gravity separation machine, shaking table is widely used for separating minerals, especially for separating gold and coal. gold shaking table for sale is mainly composed of bed head, electromotor, adjusting gradient device, bed surface, ore chute, water chute, rifle bar and lubricating system.

Concentrator table beneficiation refers to that on a slant table, relying on the combined effect of the symmetrical and reciprocating motion of the mechanical slabstone and the lamella slant water flow, the ore particles become loose, layered and zoned on the table, thus separating the minerals based on density.

Fote Machinery is a professional gold shaker table manufacturer, which has a long history in the production of concentrator table and we constantly make innovations and develop concentrator table with single-curvelet bed on the basis of the original concentrator table with vertical bed to the concentrator table with double-curvelet bed, thus greatly improving the processing capacity, returning rate and concentration ratio of the concentrator table

Name Grit concentrator table Finesand concentrator table Sludge concentrator table Bedsurface Dimensions Length (mm) 4450 4450 4450 Driving partWidth (mm) 1855 1855 1855 Concentrate partWidth (mm) 1546 1546 1546 Max.feeding size(mm) 2 0.5 0.15 Feeding amount (t/d) 30-60 10-20 15-25 Feeding thickness (%) 25-30 20-25 15-25 Stroke (mm) 16-22 11-16 8-16 Frequency (f) 45-48 48-53 50-57 Bedsurface Waterquantity (t/d) 80-150 30-60 10-17 Bedsurface Horizontal obliquity() 2.5-4.5 1.5-3.5 1-2 Bedsurface Portrait obliquity(%) 1.4 0.92 ---- Tableboard corner() 32-42 40 42 Concentrating area() 7.6 7.6 7.6 Bedsurface Lengthratio 2.6 2.6 2.6 Shapeof side-bed surface Rectangle Zigzag Triangle Motor power(kw) 1.1 1.1 1.1 Transmission device Eccentricity Linkage

As a gravity separation machine, shaking table is widely used for separating minerals, especially for separating gold and coal. gold shaking table for sale is mainly composed of bed head, electromotor, adjusting gradient device, bed surface, ore chute, water chute, rifle bar and lubricating system.

Concentrator table beneficiation refers to that on a slant table, relying on the combined effect of the symmetrical and reciprocating motion of the mechanical slabstone and the lamella slant water flow, the ore particles become loose, layered and zoned on the table, thus separating the minerals based on density.

Fote Machinery is a professional gold shaker table manufacturer, which has a long history in the production of concentrator table and we constantly make innovations and develop concentrator table with single-curvelet bed on the basis of the original concentrator table with vertical bed to the concentrator table with double-curvelet bed, thus greatly improving the processing capacity, returning rate and concentration ratio of the concentrator table

Name Max.feeding sizemm Bed surface Water quantity t/d Grit concentrator table 2 80-150 Fine sand concentrator table 0.5 30-60 Sludge concentrator table 0.15 10-17

gold shaker table sales,shaking table,gold separator - jxsc

gold shaker table sales,shaking table,gold separator - jxsc

The gold shaker table is a flow film separation equipment, that usually used to separate the gold particle grains from the ore material in the gold processing plant. Shaking table concentrator is developed from the early stationary and movable chute box, from percussion shaking table ( used in the coal mining industry) to the wilfley table and mineral processing eccentric rod shaker table, various type of gravity table separators have been developed and applied, especially in the recovery process of some precious metal like gold. Contact us to get the latest shaker table price.

Capacity: 0.1-2tph Feeding size: 0-2mm Applications: Gold, Tin, Chrome, Tantalum-niobium, Tungsten, Iron, Manganese, Nonferrous metal ore, and so on. Introduction: Gold shaker washing table can obtain the fine-grained materials, and separate the high-grade concentrate, taillights and intermediate mineral products during once processing. According to the different grain size of the ore material, it can be divided into coarse sand (2 - 0.074mm), fine sand (0.5 - 0.074mm), and ore slurry (0.074 - 0.02mm), the suited gold separate machine is varied with the material particle size, the main differences among them are the shaking table surface sluice, height, angle and so on. Main parts: table head, motor drive, stand, working bed, support frame, water tank, feed chute, angle adjuster device, spring, etc.

Types of shaking table: 1. Shake table for sale classified by uses: ore sand, ore slurry, mineral processing, coal dressing. 2. Classified by structure ( table head, surface, supporting frame ): 6-S shaker table, Gemini table, CC-2 gold wash table, spring concentrating table, centrifugal table, rp 4 shaker table, and so on shaking table mineral separation. 3. Classified by deck: single deck shaker table, the multideck table has double decks, three decks, four decks, six decks, and more.

Working principle of the shaker table: As a gravity separator machine, the shaking table separates the minerals mainly dependent on their differences of gravity, density, shape, etc, in addition, the water flow speed, slurry density, surface angle and so on variables also matters. The target mineral grains, from fine to coarse and light to heavy, can be classified by weight. The shaking table concentrator not only can be an independent beneficiation machine, but also connect with jig machine, flotation, magnetic separator, centrifuge concentrator, spiral concentrator, belt conveyor and so on.

Mining Equipment Manufacturers, Our Main Products: Gold Trommel, Gold Wash Plant, Dense Media Separation System, CIP, CIL, Ball Mill, Trommel Scrubber, Shaker Table, Jig Concentrator, Spiral Separator, Slurry Pump, Trommel Screen.

gold shaking table

gold shaking table

A Gold Shaking Table are basically low-capacity machines used as last step in the gold upgrading process. Theshakingtable is a thin film, shear flow process equipment, that separatesparticlegrains of its feed material based on thedifferences in their specific gravity, density, size and shape. Mineral rich particles, from light to heavy and fine to coarse will be sorted by net effective weight. Finely crushed or ground ore material goes as feed mixed with water to form a pulp (mud) andfed as slurry of an average about 2025% of solids by weight onto the highest point of the table deck. The gold tables deck hasa reciprocal movement along its main axis that is given using a vibrator or an eccentric head motion. The table surface is manufactured and fitted with several tapered strips called riffles or grooves, often made with of yellow pine (way back in time that is), low-density polythene or aluminum surfacing.Shaking tables and other thin film separating plant recover finely divided gold under conditions of subcritical laminar and supercritical laminar regimes of flow, which may occur only where there is a very thin depth of fluid.

Agold shaking tables riffles taper downwards in elevation in the direction the gold (and all heavies), precious metals concentrate discharge end of the table. This facilitates the ease with which mineral particles can move transversal to the tables axis or shaker-line, therefore helpingseparation over the complete tablelength. Riffle heights and pattern designs are selected based on the desired and required duty/function expected.

Preparing several size fractions for tabling is usually achieved in a hydrosizer. Ifgold is present in both coarse and finely divided sizings at least three, or perhapsfour separate size fractions must be treated, each under a different set of operatingconditions. Tables operate most efficiently with a closely sized feed. The slurry fansout across a smooth section of the surface until it reaches the riffles. The lighterand very fine particles are washed over the riffles and moved along the riffles by thereciprocating motion imparted to the deck while the heavier particles are held back. The concentrates of heavy mineral and gold are discharged over the end of thedeck. Tailings are washed over the lower edge and a middlings fraction is taken offbetween the lower edge of the concentrate strip and the higher edge of the tailingstrip.

Wash water usage is dependent upon the particle diameter and varies from aslow as 0.7 m/t/h of solids for slime decks, up to 56 m/t/h for coarse solidsseparation. Coarse fractions are usually treated at feed rates of up to 1 t/h using approximately 15 to 20 mm stroke lengths at around 280 rpm (Wilfley table data). Thestroke lengths of finer fractions are reduced to 915 mm with increased speeds ofup to 325 rpm but, because of the corresponding lower film, thickness capacitiesmay fall to around 0.25 t/h. The inclination of the deck is adjusted during operationusing a hand-operated tilting device. It is important following each adjustment toallow the table operation to settle down before making a fresh adjustment. The correct inclination is reached when the ribbon of concentrates is clearly defined andremains steady.

The extreme sensitivity of water depths and corresponding current depths to obtain F = 1, and the use of stationary tables as primary concentrating units, was probably the main reason for the consistently low (R.E. 6065%) gold recoveries of early dredgers. For such table types, the fluid forces are applied to the stream-beds as a whole and ripples form, which keep the sand in orbital motion and provide for the denser particles to sink to the bed. Deposition is most favoured by anti-dune conditions produced by free-surface flow at or near the supercritical state. Such bed forms are in phase with the water surface and are produced in the rapid flow conditions of Froude Number F = 1. In this state of flow, the bed forms of the upper flow regime are stable. Below F = 1 the flow is tranquil and shear forces are reduced. In reviewing recovery distributions of certaindredgers it wasnoted that some coarse gold reported with the tailing after passing through two stages of tabling and that fine gold did not concentrate noticeably down the line.

I consider the gold shaker table to be a shaking sluice box OR self cleaning sluice as they both essentially are classifiers used as heavy gold concentrating devices. Apart from nuggets; generally the valuable minerals like heavy precious metals like platinumandpalladium thatcan berecovered by tables and sluices, are found in one size range (generally the finest) and the waste minerals in another. On agold sluice, large particles (gravel) travel by sliding and rolling over the riffles, with finer particles travelling by saltation. Sand travels by a combination of modes described earlier with some saltation over the riffles.Very fine particles are maintained in suspension by turbulent and inter-particle collision.

Riffles function properly only if in the space between them and the slurry is sufficiently live (turbulent) to reject the lighter particles, but not so lively that the gold cannot settle. On a gold shaker table, those particles are allowed to settle as they will get transported to the other end by the vibrating/shaking back-and-forth motion. Lower grade, light pieces, will be able to escape the table a the riffles becomes shorter along the tables length.Once the particle has started to move, the coefficient of friction changes to a dynamic coefficient of friction. In fact, because the fluid push on the particles is larger at the top of the particle than at the bottom, the particle rolls, largely according to the shape of the particle and according to the speed. At low speeds, the effective friction is the relatively large coefficient of dynamic sliding friction, and at high speeds it is the lower coefficient of rolling friction. The change probably takes place partly continuously and partly discontinuously. As a first approximation, the dynamic coefficient of friction may, however, be regarded as constant.

In a sluice box, the settling of heavy minerals between the riffles requires frequent stirring to prevent the riffle spaces from blinding. This also disturbs the gold, which then moves progressively down-sluice. Frequent clean-ups are needed to avoid excessive loss. Boxes may be used in parallel to avoid loss of production time. One box is kept in operation while cleaning up in the other.

Effect of Deck Roughness: The foregoing analysis is based on the postulate that the deck is perfectly smooth. If the deck is rough, i.e., if it has at its surface some recesses capable of partly shielding fine particles from the rub of the fluid, the slope required to move the particles by either rolling or sliding will be increased. At the same time such an effect, while present also for large particles, may be so much smaller for them as to be imperceptible. The relationship of critical angle to size obtained above will therefore not hold for rough surfaces. The problem is analytically complex and it is nevertheless a problem that might well be explored further if a full insight is desired into the mechanism of flowing-film concentration.

Adjustments are provided in all tables for the amount of wash water, the cross tilt, the speed, and the length of the stroke. The speed of the table ranges usually from 180 to 270 strokes per minute, and the strokes are from 1/2 to 1 1/2 long.

Variations in character of feed require variations in operation. The operators duty is to take care of them by adjusting the tilt, the wash water, and the position of the splitters that control discharge of table into concentrate, middling, and tailing launders. One man may look after 10 to 100 tables, depending upon the regularity of the feed and the difficulty of the task assigned to the table.

A coarse feed can be treated in larger amounts than a fine feed. It would seem that the treatable tonnage increases at least as the square of the average size (theory indicates that it increases as the cube of the particle size).

A roughing operation is preferably conducted on a fully riffled deck. These decks have a greater capacity because the particles are treated throughout the deck in the form of a teetering suspension many particles deep instead of as a restive layer one particle deep. Such decks do not provide flowing-film concentration but some sort of jigging. On the other hand, a cleaning operation is preferably performed on a partly riffled deck.

It is clear that minerals of different specific gravity must be present the greater the spread in specific gravity between minerals, the greater the capacity since that sort of condition permits crowding without considerable penalty.

The effect of locked particles on capacity of tables should also be recognized. These particles behave in a fashion intermediate between that of pure particles of their constituent minerals. It is as if a three-product separation were sought in which one of the products would guide-in specific gravity between the two other.

Table capacity may be as high as 200 tons per 24 hr. on a fully riffled deck 4 by 12 ft. treating minus 3-mm. sulphide ore having a specific gravity of about 3.0 (roughing duty), or 500 tons per 24 hr. But table capacity may be as low as 5 tons per 24 hr., or even less, for fine ore (minus 0.3 mm.) if there is only a small specific-gravity differential between minerals.

Operating a shaking table is cheap as power requirement per table are typically low. Most of the energy is expended to move the deck, which must therefore be as light as is consistent with rigidity. Laboratory gold shaking table testingreport.

There are a few steps that need to be taken in order to get yourgold shaker table to work efficiently. The first step that aspiring gold miners must take would be to make sure that all four corners of the table are level from forward to back. It is very important to anchor the bolts so that the shaking of the gold goes to the table and not through the frame. After you begin running your table, you may need to adjust your table from side to side to maintain an even flow of materials on both sides of the table.

A gold shaker table contains a water access point where you can fill it with clean water, which can be seen right under the control area. Alternatively you can directly fill the tank of the shaker table with clean water. The water access point allows you to connect a clean water system through a garden hose. The valve that is right behind the tank is then turned off and the pump system is not running during the process of running fresh water. When clean washing water is distributed at the top of the table at right angles, particles are moved diagonally across the deck and separate from each other according to their size and density. During the fast shaking process, you will gradually begin to see the separation of materials. For example, when you have dirt and rocks that contain materials like lead, sulfides and gold, because of the varying weights of these different materials, you will see these materials venture off in different directions on the shaker table. The lead and the sulfides will be carried over to the right side of the table while the pure gold will be carried over to the far left side of the table.

There is one term to remember when professional gold miners describe the actions of a gold shaker table. When professional gold miners say that small particles of gold are being carried through the grooves, they are referring to the ripples that you can plainly see on the shaker table. When they say that there is an overflow of materials like Black Pyrrhotite, White Quartz, silver and gold on the grooves, then this is a good thing.

When materials are washed by the clean water they are supposed to drop into 3 hoppers/launders underneath the table. There is a centre launderthat will gather the purest portions of gold while the two outside launders will gather some gold, though not as much.

It is crucial to remember to plug the cable of your shaker table into a GFCI (Ground Fault Circuit Interrupter) outlet. Most shaker tables will not work if they are plugged into any other kind of outlet.

In aPercussion Gold Shaker Table,the work of keeping the pulp in a state of agitation, done by the rakes or brushes in the German and Cornish buddies described above, is affected by sudden blows or bumps imparted sideways or endways to the table. The table is made of wood or sheet metal, the surface being either smooth or riffled.

End-bump tables are hung by chains or in some similar manner, so as to be capable of limited movement, and receive a number of blows delivered on the upper end. These blows are given by cams acting through rods, or else the table is pushed forward against the action of strong springs by cams on a revolving shaft, and then being suddenly released is thrown back violently by the springs against a fixed horizontal beam. The movement of the pulp depends on the inertia of the particles, which are thrown backward up the inclined table by the blow given to the table, the amount of movement varying with their mass, and depending, therefore, both on their size and density. The vibrations produced by the percussion also perform the work of the rakes in destroying the cohesion between the particles, and a stream of water washes them down. The result is that the larger and heavier particles may be made to travel up the table in the direction in which theyare thrown by the blow, by regulating the quantity of water, while the smaller and lighter particles are carried down. These machines yield only two classes of material, headings and tailings. One such machine, the Gilpin County Gilt Edge Concentrator was devised in Colorado, and has displaced the blanket sluices atalmost all the mills at Blackhawk. It consists (Fig. 46) essentially of a cast-iron or copper table, 7 feet long and 3 feet wide, divided into two equal sections by a 4-inch square bumping-beam. The table has raised edges, and its inclination is about 4 inches in 5 feet at its lower end, the remaining 1 feet at the head having a somewhat steeper grade. The table is hung by iron rods to an iron frame, the length of the rods being altered by screw threads, so as to regulate the inclination to the required amount. A shaft with double cams, A, making 65 revolutions per minute, enables 130 blows per minute to be given to the table in the following manner; onbeing released by the cam, the table is forced forward by the strong spring, B, so that its head strikes against the solid beam,C, which is firmly united to the rest of the frame.

The pulp coming from the copper plates is fed on to the table near its upper end by a distributing box, D, and is spread out and kept in agitation by the rapid blows. Thesulphides settle to the bottom of the pulp, and are thrown forward by the shock, and eventually discharged over the head of the table at the left hand of the figure, while the gangue is carried down by the water and discharged at the other end. One machine is enough to concentrate the pulp from five stamps. If the table consists of amalgamated copper plates, it is of some use for catching free gold also, treating about 8 cwts. of ore per hour. This machine is not so effective in saving slimed pyrites as the Wilfley table or the vanners.

Gold shaker tables are environmentally friendly (chemical free) for recovering pure gold as they can play an important part in reducing the use of mercury by gold miners. With gold shaker tables miners dont need to resort to mercury amalgamation or cyanide to recover gold. The filter will constantly need to be removed and cleaned as it will get dirty even after using the table a few times.

Miners can design and construct a basic shaking table out of cheap materials that are affordable in local stores, including a drive mechanism that contains bicycle gears, chains and rubber bands that are made from car tire inner tubes. The drive mechanism for a gold shaker table can be a hand crank or it can contain parts of a motorcycle frame and engine. If one prefers to use a motor for his or her table, either an electric motor or a motor that runs on diesel fuel would be the ideal options.

It is important to keep in mind that there is no one specific way to create your own gold shaker table system. Many professional gold mining organizations will create tables of different shapes and sizes to cater to the needs of their customers. Some shaker table systems will feature machines that can crush hard rocks, which are referred to as jaw crushers. The speeds of shaker table systems will vary as they can shake from hundreds to thousands of pounds of materials per hour.

double-deck gold shaker table

double-deck gold shaker table

The 911MPEGMS-2DST double deck DUPLEX gold shaker table is effectively 2 super-imposed 4 x 8 decks and processes 2 tons per hour of -200 minus to 4 tons or more of sand size material. This provides you with 64 square feet of tabling area. The same gold recovery area a 12 X 5 4 table would provide you.

The 911MPEGMS-2DST is our large high capacity gold shaker best seller. More miners buy the 911MPEGMS-2DST than the classic single-deck 911MPEGMS-1DST. The 911MPEGMS-DST operates at 1000s of gold mining operations around the World.

The high-capacity double-deck shaker table is self-balancing and does not need to be bolted down. By double stacking its 4 x 8 decks, the 911MPEGMS-2DST offers you 16 feet of tabling length in 50% less footprint with the added stability of the self-balancing motion.

The shaking motion of the high production concentrating table is such that the top and bottom tables move in opposite directions at the same time. The weight and simultaneous opposite motions of each deck effectively counterbalances the energy to nil. This cancels out any vibrations that typically makes a table walk and forces you to bolt it down securely.

The double deck concentrating tables was originally developed for the recovery of tin from low-grade feeds, but has a wider application in the recovery of tungsten, tantalum, gold, chromite, and platinum from fine feeds. Two decks are used alternately to provide continuous feeding, the feed slurry being fed onto one of the decks, the lower density minerals running off into the discharge launder, while the heavy minerals remain on the deck. The deck is washed with water after a preset time, in order to remove the gangue minerals, after which the deck is tilted and the concentrate is washed off. One table is always concentrating, while the other is being washed or is discharging concentrates. The concentrator has a capacity of up to 5 tph of -100 um feed producing enrichment ratios of between 20 and 500 and is available with various sizes and numbers of decks.

Separation of particles on a table deck is not merely the result of their differences in specific gravity, but rather there are numerous interrelated phenomena. A decided advantage of tabling oversome other known processes is the fact that a great many variables can be made to aid and assist in effective separation.

The more generally accepted explanation of the action of a concentrating shaker table is that, as the material to be treated is fanned out over the table deck by the differential motion and gravitational flow, the particles become stratified in layers behind the riffles. This stratification is followed by the removal of successive layers from the top downward by cross-flowing water as the stratified bed travels toward the outer end of the table. The cross-flowing water consists partly of water introduced with the feed and partly of dressing water fed separately through troughs along the upper side of the table. The progressive removal of material from the top toward the bottom of the bed is the result of the taper in the height of the table rimes toward their outer end, which allows a successively deeper layer of material to be carried away by the cross-flowing water as the outer end of the table is approached. By the time the material reaches the end of the table, only a thin layer, probably not much thicker than one or two particles deep, remains on the surface of the deck, this layer being discharged finally over the end of the table.

The physical and mechanical principles involved in the concentration action of a table are somewhat more complicated than this cursory explanation implies. A mathematical analysis of flowing film concentration, while of fundamental value, pertains mostly to smooth deck surfaces and does provide details concerning the phenomena surrounding the use of riffles. Such mathematical calculations are prerequisite to an understanding of basic principles, but they do not begin to explain the sharp separations that tables are capable of achieving.

Unless the table feed contains a high percentage of near-gravity material, high tabling efficiencies may be expected. If a table could be operated on feed consisting of nothing but a mixture of individual fine particles with a size range of approximately 1/4 to 50 mesh (6.3 to 0.3 mm), a near-perfect separation could be obtained. With such a feed, a well-operated table would probably recover 99.5% of the fine while eliminating not less than 95% of the shale. This implies almost perfect stratification according to specific gravity without regard to particle size. However, it is improbable that such stratification could be attained entirely as a result of the motion of the deck and the flow of water in a plane parallel to the deck surface. The question then arises as to the other forces or factors that are involved which contribute significantly to the efficiency of the separation on a table.

No exhaustive study has been made of the principles involved in table concentration by either ore-dressing or ore preparation engineers. Engineers probably have given more attention to the subject than anyone else, even though their experimental work was of a preliminary nature. It was their aim to bring out the fact that stratification, contrary to the common belief, will not account for the separation effected by the fine gold washing table, and that cross-flowing water, in addition to removing the top strata found on the table, must also have an important selection action in completing the separation according to specific gravity, both in the upper and in the lower strata found between riffles.

Metallurgists developed a theory as to the selective action of the cross-flowing water postulates that only a part of the water flowing across the table flows over the top of the bed between the riffles; the remainder flows through interstices in the bed. These interstices are comparatively large near the top of the bed, but become progressively smaller toward the bottom, thus forming, in effect, V-shaped troughs. Under these conditions the water currents are relatively swift near the top of the bed and become progressively slower toward the bottom. According to them, With paths for the water such that the top strata are subjected to relatively swift currents and the lower strata are subjected to progressively slower currents, the separation actually occurring on the table can be explained. As the coarse particles at the top receive swift currents and each successively finer size at the lower levels receives slower currents, the velocity of the water matches the size of materials comprising the different strata. Under these conditions a separation occurs in the lower strata similar to that in the top strata, only it takes place more slowly. The slow currents of water within the bed carry the fine-waste particles along from riffle to riffle at a more rapid rate than they do the fine-bone and shale particles.

Although stratification due to the nearly horizontal action of the table deck and the flow of water in a plane parallel to it probably are not sufficient to account entirely for the sharpness of separation achieved by a table, it is, nevertheless, the fundamental principle of the table, just as hindered settling is the fundamental principle of a jig. Although these processes are of diametrically opposite characteristics, a table probably utilizes the hindered-settling principle at least to a minor extent. For convenience in this discussion, the stratification due to the more or less horizontal action of the table deck and flow of water will be referred to as table stratification. This type of stratification is illustrated by the separation that takes place when a box of large and small spheres is shaken and agitated in a horizontal plane in such a way that the large and small marbles collect into separate layers, with the small marbles collecting in a layer on the bottom, while the large marbles collect in a top layer. The principle of hindered settling can be demonstrated by placing a mixture of large and small marbles in a vertical cylinder of suitable size with a perforated-plate bottom. If water of sufficient volume and pressure is forced upward through the perforated plate so as to keep the marbles in teeter for a short interval, the marbles will separate into layers, with the large marbles in the bottom layer and the small ones on top. The separation is the opposite of that obtained by table stratification. In these illustrations of stratification and hindered settling, it is assumed that the marbles are all of the same specific gravity regardless of size. If some marbles have higher specific gravities than others, the effect will be to increase their tendency to settle toward the bottom, regardless of whether this tendency favors or opposes the stratification or hindered-settling action. The heavier the small marbles, the easier the separation by table stratification and the more difficult by hindered settling. Conversely, the heavier the large marbles, the more difficult the separation by table stratification and the easier the separation by hindered settling.

In keeping with the above principles, complete separation according to specific gravity could hardly occur on a table or any other concentrating device as a result of either table stratification or hindered settling alone when the material to be separated consists of particles varying in both size and specific gravity. In fine gold washing the objective is to separate fine gold particles from tailings particles according to specific gravity without reference to particle size. As this separation can be accomplished more effectively by utilizing the combination of table stratification and hindered settling, it is quite likely that both processes actually do play a role in the operation of a concentrating table.

shaking tables, knudsen bowl

shaking tables, knudsen bowl

For gold operations we design and manufacture the MD Gemeni range of Shaking Tables. Specifically designed to produce a gold concentrate that can be directly smelted to bullion, the Gemeni Shaking Tables are a cost effective solution.

The Mk2 features a direct, fixed speed drive system and can be operated in batch or continuous mode. The MD Gemeni Shaking Table range is almost invariably used for retreating concentrate from sluices, spirals, conventional shaking tables and centrifugal separators

Mineral Technologies supplies Holman Wilfley wet shaking tables for recovery of precious metals, copper wire, synthetic diamonds, chromite, heavy mineral sands and gold. The different models process feed streams of between 5 and 2,500kg per hour. Holman models are available for all fine minerals concentration (e.g. mineral sands, tin, tungsten, chromite, gold). Wilfley model 7000 is available for metal recycling and reprocessing of WEEE materials (Waste Electrical and Electronic Equipment).

Mineral Technologies designs and manufactures the MD Knudsen Bowl. Specifically designed to recover gold from alluvial or hard rock deposits, upgrading and recovery of gold from concentrates from other gravity separation stages, exploration and evaluation of gold deposits ,and other mineral applications including cassiterite and scheelite.

shaking table | gold concentrating table | shaker table for gold | dove

shaking table | gold concentrating table | shaker table for gold | dove

DOVE designs its Concentrating Tables(Shaking Tables) for both right and left hand feed operations. Due to space saving consideration, DOVE supplies multiple-deck table configurations. Multiple-deck consisting of two or three deck levels affect space saving proportionate to the number of decks employed.

DOVE Concentrating Tables(Shaking Tables) are fabricated with only high quality material and workmanship. Operating decks are made of special marine teak wood and covered with ultra-smooth one-piece rubber with series of rubber riffles on its surface.

DOVE employs various deck types and riffle patterns. DOVE Concentrating Tables are available in rectangular or diagonal deck types with sand riffling, slime riffling, or individual riffle patterns, depending on the individual separation requirements.

DOVE Concentrating Table(Shaker Table for Gold) is the most metallurgical efficient and selective wet gravity separation device, which offer exceptional efficiency in material separation that other existing tables in the industry with rough-surface covering cannot achieve.

Concentrating Tables (Shaking Tables) are effectively used for processing Gold, Silver, Lead, Zinc, Aluminium, Coal, Barite, Beach Sands, Chromite, Glass Sand, Garnet, Iron, Manganese, Mica, Phosphate, Potash, Tantalum, Tin, Tungsten, Titanium, Zircon and etc.

Concentrating Tables(Shaking tables) are comprised of wooden decks, rectangular or diagonal shape, with ultra-smooth rubber cover and riffle surface and are operating in horizontal plane, where material with higher specific gravity is separated from material with lower specific gravity.

Head Motion imparts a reciprocating movement to the tables deck in a horizontal plane. As the material moves across the table, the shaking action of the deck causes size classification and specific gravity stratification.

The flow of cross water causes shearing of stratified material and forces it to cascade over the rifle surface of the tables deck. Lower specific gravity material remains close to the water surface and rides over the riffles towards discharge end of the table; higher specific gravity material is being hold back by the riffles, which is closest to the tables surface, and moving along the tables deck to the concentrate discharge.

DOVE laboratory will assay your ore samples rapidly and analyze your raw materials and recommend the most efficient processing plant according to the ore specifications, minerals composition, and ore assay results, and your project size and the geologic and topographic conditions of your mine.

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