Gravity Concentration By Jigs Anatomist Essay

Gravity attention methods separate nutrients of different specific gravity. They are being used to treat a great variaty of materials [ranging from Au ( sp. gr. 19. 3 ) to coal ( sp. gr. 1. 3 ) ]. Gravity concentration methods remained, however the main concentrating methods for flat iron, tungsten, tin ores and coal. This methods are usually preferred to flotation due to its low priced. Minerals liberated at sizes above flotation range may be concentrated even more economically using gravity methods (also cause effective dewatering due to decreased surface area. ). The main concepts of appliying this method differs size and shape of vitamins having different specific gravity. This method can be employed at the range of 7. 5 - 1. 3. And, the features of this method are its simplicity, having high capacity and low cost. To be able to apply gravity amount method concentration standards ( cc ) shoud be at perfect range.

CC = dh - df

dl - df

CC >2. 5 ( 74 micron )

CC <1. 25 HMS depending on liberation size it can be

CC = 2. 5-1. 75 ( 150 micron ) applied easly

CC =1. 75 -1. 50 ( 1. 7 micron)

CC = 1. 5 - 1. 25 ( 6mm )

Jigging is a kind of gravity awareness method. This method seperates vitamins of different specific gravity by their relative movement in response to gravity and ore or more other pushes the latter often being the amount of resistance to motion proposed by a viscous smooth, such as drinking water or air. The jig is generally used to focus relatively coarse materials. Good separation can be done if the give food to is closely size (e. g. 3 - 10) of course, if the sp. gr. difference is large. Many large jig circuits are still managed in the coal, cassiteriite, tungsten, silver, barytes and iron-ore market sectors. Jigs have a comparatively high device capacity and can perform good recovery of values down to 150 m and acceptable recoveries often right down to 75 m. (High proportions of fines hinder performance. ).

Jigging is the stratification of minerals of different sp. gr. The parting is achieved in a foundation which is rendered smooth with a pulsating current of drinking water in order to produce stratification. The goal is to dilate the foundation of material being treated and to control the dilation so that the heavier, small debris penetrate the interstices of the bed and the bigger high sp gr allergens fall under an ailment probably similar to hindered settling. Within the pulsion stroke, the bed is normally raised as a mass, underneath particles slipping first until the whole bed is loosened. For the suction stroke, it then closes gradually again and this is repeated at every stroke; the frequency differing between 55 - 330 routine / min. The fine debris tend to go through the interstices following the large ones have grown to be immobile. The movement can be acquired either by using a fixed sieve jig and pulsating the water, or by employing a moving sieve in a straightforward side- jig.

Jigs can be split into two groups. One of them is Nutrient Jigs ( 16mm - 100 micron ) This jigs is seperated into two groups: Harz and Denuer. And, a different one is Coal Jigs

( 25mm - 150 mm). This jigs is also seperated into two organizations. These are Baum and Batac.

Mechanism:

Jigging operations

Terminal velocity: As the object keeps on accelerating downwards, the drag produced is increased. At a specific speed, the pull power produced will be add up to the downward force, mainly the weight (mg), of the thing. Eventually, it plummets at a regular acceleration called terminal velocity. Terminal speed varies immediately with the proportion of move to mass. More pull means slower terminal speed. Increased mass means higher terminal speed. An object moving downwards at greater than terminal velocity (for example because it was affected with a force downward or it dropped from a thin area of the atmosphere or it evolved form) will slow until it reaches terminal velocity.

Free settling: An subject that sinks in a substance because of just gravity is reported to be free falling.

Hindered settling: Once the proportion of solids in the pulp raises hindered settling occurs. In this situation particles move slower under the affect of packed pulp.

Objectives

To demonstrate the result of the ragging layer

To start to see the effect of working variables of j±gs

To demonstrate the stratification process

To observe the difference in the pace of stratification as a function of the worthiness of the concentratin criterion

Experimental

Materials:

Quartz

Chromite

Equipment:

Multi compartment piston type lab jig with a display of 3 mm aperture, and 200 gr of stainless balls of 4 mm diameter as ragging material

Crushed heavy nutrient in the size of - 3mm + 5mm (Chromite)

Crushed light nutrient in how big is - 3mm + 5mm (Quartz)

Procedure:

By using of the batch lab jig;

a combination of one heavy nutrient, one light nutrient a bed of stainless balls as ragging materials was ready on only one of the jig screen.

Fill up the jig with hutch water

Start the jig and observe the rate of stratification of mix components

Collect the light product that lows in the discharge weir.

Discussion

Batac Jigs;

BATAC Jigs are applied in coal beneficiation plant life as well as in ore and slag changing functions. For coal planning BATAC Jigs are used for destoning and therefore for the precipitation of the inorganic sulfur. For ore and slag processing, among other applications, BATAC Jigs are used for the pre-concentration of the give food to materials. Cut-points in the number of 1 1. 3 kg/dm to 7. 85 kg/dm are variable.

There is one decisive difference between a BATAC Jig and a Baum Jig: this particular current is not produced within an air chamber installed next to the screen dish but in air chambers within the jig bed. These air chambers are intermittently given compressed air by an electronically manipulated valve or flap valve system (pulse generator). Mid-air is intermittently discharged from the system at atmospheric pressure after conclusion of the upwards stroke. Movement is imparted to water inside the jig as a function of the pressure produced inside the air chambers. In addition, make-up normal water is added at the lowest location of every jigging chamber to intensify the upwards current and to dampen the downward current. The give food to is stratified corresponding to its thickness by the pulsating movement of this when preparing coal, e. g. , in refuse, middlings and clean coal.

The heavy small fraction of the stratified raw materials is sensed by floats relative to the product features required. The system provides for managed withdrawal of the heavy fraction over a discharge device. Jigs of great widths are equipped with independently operating discharge devices built in with distinct sensor systems and hydraulic systems. This settings ensures best product qualities over the complete jig width even material syndication is non-uniform.

Distincitve Features

In order to attain highest efficiencies, all modern under-bed pulsated BATAC Jigs include

a centre air chamber for every compartment for secure operation and uniform stroke circulation,

PLC-based jig controllers for everyone jig functions, inter-operable with all proven process automation systems,

independently working release devices, each outfitted with different hydraulic drive systems,

ultrasonic sensor technology for highest release precision,

large open-area jig decks with excellent resilience, customized for every application.

Baum Jigs;

A Baum Jig for gravitational enrichment of mineral deposits, specifically hard co when a screen deck is transversely located to the axis of the jig. Air chambers are made of plates as cut-outs of the cylindrical surface. The axes of symmetry are deflected from the perpendicular by an angle of 5 to 15 in the direction of the mineral to be enriched. The chambers are provided with asymmetric guide vanes variable in the horizontal direction. The side wall space of a drinking water cistern have got at the height of the display decks, horizontal off-sets beyond your cistern. Spring-loaded protection plates are given in the off-set aids. The lower advantage of one wall of each chamber is molded as a conduit of rear water provided from the bottom with a deflectable arched diaphragm.

In comparability with known jigs, a great executive and design similarity enables a prefabrication of parts in a wide range, thus shortening development time.

2) For instance; Centrifugal jigs

An example of a centrifugal jig is the Kelsey jig, produced by RocheMT. This includes the pulsing action, normal water injection and the utilization of the ragging medium and internal screen of a conventional, but additionally centrifugal spinning action to improve the gravity parting. This permits sand sized minerals of pretty similar SG as well as fine vitamins to be segregated more efficiently. As a result of the additional operations used the Kelsey jig is significantly more expensive and complicated to operate and keep maintaining. The supply to a Kelsey jig must be screened at a size less than the internal screen to avoid pegging, and the tailings must be screened to be able to recuperate ragging as oversize. To be able to maintain operational and mechanised efficiency the Kelsey jig will need to have the internal display screen cleaned daily plus some of the moving parts checked and greased. This may now be done automatically, but the feed must still be quit. The Kelsey jig is offered in two models: the J1300 and J1800, the second option having greater capacity.

Operating variables include

Hutch normal water flow

Spin rate

Pulsation frequency

Pulsation heart stroke length

Ragging SG, size and shape

Bed depth

Concentrate orifice diameter

Internal display aperture size

Feed rate and thickness ( typically 20 to 25 tph at 40% solids for a J1300 although throughput is dictated principally by concentrate rate)

3) Silver mining equipment diaphragm jig : industry type

Specifications

Gold mining equipment diaphragm jig

Smelting slag metal recycling, High recover

large capacity of treatment, continuous works

Mining equipment diaphragm jig

1. Composition of side way action diaphragm jig, additionally it is called up way action diaphragm jig. The two times compartments side way action diaphragm jig comprises two jigging chambers linked with the other person with certain difference. The framework of every chamber is the same, which includes framework, driving a vehicle and moving system, jigging chamber and pyramid lower part box.

2. The working procedure for dual compartments side way action diaphragm jig. Crude ore is fed to jigging chamber from the very first supply launder, the diaphragm produces vertical alternating electric current under the action of eccentric website link meachnism, making the ores split as their denseness, the principle is the same as abovemetioned.

Illustrate:

Diaphragm jig belongs to two times rooms under the solo plug-fuse type. It makes use of water as medium, and separates based on the percentage of the gangue minerals (density). It is the beneficiation equipment.

Superiority: jig machine will the sine influx motion. It has the advantage of high recover, large capacity of treatment, continuous work.

UseWidely found in handling tungsten, tin, antimony, mercury, alluvial silver deposits, manganese ore, barites, fluorite, lapis lazuli, ore, pyrite, limonite and ore dressing and hematite etc all sorts of smelting slag metal recycling. As this machine is a small size, so that it can used as test machine in laboratory.

Conclusion

Jigs are easy run devices with high efficiency and applicability. Many parameters should be considered used of jigs to get the best result. It includes some advantages over other attention devices. First, it is easy to use. Second, it requires less labour and floor space. Moreover, it includes a low maintenance cost. Furthermore its energy utilization is noticeably low as it works only with a pump to pulsate drinking water. Jigs may be used to achieve a good recovery in particle size below 150 m. It could be said that although its structure is simple, they have many actions at work impact seperation of minerals of different gravities. And also, its mechanism is very simple to seperate the vitamins with different specific gravities.

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