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what is jig in mineral processing

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mineral jig separator | jig concentrator - mineral processing

A feature of jigs is that the composition of the jig bed can be carefully designed by placing a layer of coarse dense particles known as ‘ragging’ on the jig screen. These may include steel balls or a suitable heavy mineral such as hematite Fe2O3. By this means, only very dense grains will penetrate through the ragging and fall through the jig-screen. Grains of lower density (e.g. quartz SiO2) remain above the ragging

• Low water consumption when compared with most centrifugal concentrators.• A high degree of recoveries – recover 0.5% to 30% concentrate, increasing recovery rate.• Wide feed and particle size recovery – feed size up to 30mm, which reduces the step of prescreening the feed. Improve the potential for gravity recovery and avoid excessive grinding• efficient – low operating costs, low water consumption

gold jig & mineral processing jigs

The Gold Jig or Mineral Jigs are important of all types of alluvial gold concentrating device among all gravity separation methods; they are also the most complex and the practice of jigging in mineral processing is often viewed as an art rather than a science. Gold jigging has been referred to as being probably the most complex gravity operation because of its continuously varying hydrodynamics. The mineral bed is repeatedly moved up by the water, expands, and then re-settles, the resettlement occurring with the water flowing down at a lower rate (because of the addition of hutch water) than that which occurred on the upstroke. It follows that the waveform itself must be a significant parameter. The manner in which the bed expands is also important because of its marked effect on the particle dynamics. A number of experimental studies are reported in the literature but too often they fail to contribute to the understanding of gold jigging. This conflicting information appears to arise because many studies were carried out on a narrow set of ideal conditions that resulted in behaviour quite unlike that associated with practical gold jigs

Theories of jigging also tend to describe the mechanism of separation in pulsating water in general terms but without any complete understanding of the processes involved. The most favoured explanation is that stratification occurs in the jig bed as a result of a combination of three mechanisms:

The above mechanisms assume initial upward flow without stratification; the materials being lifted en masse. This is probably not so, and since there is no direct experimental confirmation of the actual behaviour of the particles concerned, a complete understanding of the separation process still remains to be achieved. Similarly, while repeated dilation and compaction of the bed takes place as a result of water pulsation, the separation mechanism has not yet been demonstrated theoretically in quantitative terms. Suggestions by workers in coal and other fields that interstitial trickling mechanisms should be looked at more closely. Investigations by researchers outside the field of mineral processing have indicated that the ‘interstitial trickling’ mechanism is likely to be a strongly geometrically dependent effect; large particles being displaced upwards by small particles when all particles are of the same density

It is also likely that the deterministic approach implicit in the existing mechanisms, which effectively consider the motion of a single particle in isolation, will have to be abandoned in favour of a stochastic or probabilistic approach

gold jig & mineral processing jigs

The practical importance of jigging is that stratification occurs with the denser minerals at the bottom of the bed and the lighter minerals at the top. Two main jig types, rectangular and circular, are linked through a trapezoidal jig form

Rectangular gold jigs are made of either a single 1  jig-cell as stand-alone, or a series of cells organized  in modules of two (duplex jig), three (triplex) or four cells (quadruplex). In a multiple-cell jig design/setup, the rejected tailings from the front cell passes thru as feed to the following second cell compartment; tailing from the second cell vessel is feed to the 3rd-third cell and on down the bank. Ordinarily, roughing duty is done using three- or four-cell modules. The double or two-cell arrangement that is commonly called the duplex is ordinarily  confined to secondary circuits and cleaning systems. Over mineral processing history, jig designs have not changed much and in today’s practice, rectangular jigs are mostly limited to roughing tasks in flowsheets where low starter initial cost is a important, or where the gold is preponderantly in grains > 200 um and therefore easy to recover. Fans of the rectangular jig design, will admit and understand all jigs have the common disadvantage of lower recovery for gold finer than approximately 200 um. The lower finer gold recovery jigs have is principally caused by these factors:

[ processing jig mineral ]

Mineral Processing Jigs Jonkers .au Introduction. A 4m wide Jig I recently commissioned in India A jig is a simple mineral processing device using water and the force of gravity to separate a raw ore

Jig concentrators are devices used mainly in the mining industry for mineral processing, to separate particles within the ore body, based on their specific gravity (relative density). The particles would usually be of a similar size, often crushed and screened prior to being fed over the jig bed. There are many variations in design; however the basic principles are constant The particles are introduced to the jig

The trapezoidal jig has a larger processing capacity and can process the particle size of 50 0.25 mm. It has been widely used in tungsten, tin, and iron ore concentrators in China. It has been widely used in tungsten, tin, and iron ore concentrators in China

May 19, 20160183;32;Three Pistons Jig Driven by a 1 HP, 1400 rpm, 380 v, 3p, 50 Hz electrical motor and gearbox drive. It is a device to enrich various minerals like carbon,coke,etc.,in three compartments

[ processing jig mineral ]

Jig Concentrators are gravity concentration devices, designed and mainly used in mineral processing for washing, separation and concentration of coarse metals amp; minerals within the body ore, based on its specific gravity, over the selected screen mesh

Gold Jig amp; Mineral Processing Jigs. The most favoured explanation is that stratification occurs in the jig bed as a result of a combination of three mechanisms The bed is lifted en masse in the upward flow but differential acceleration occurs at the end of the pulse when the water reverses its

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