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Index

Standard JIG installation range

Recovery IHC JIG

Advantages of the IHC JIG

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Page 21

Page 20

Page 22

Page 13

Page 15

Page 6

Introduction Page 3

Page 10

Page 12

Saw-tooth movement

Employment of the JIG installation

Grain size

Design of the JIG installation

IHC drive system

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The IHC has a complete range of JIG installations which can handle a large capacity on a relative small plant with a high recovery. IHC Holland has undertake theoretical and practical research into the design and performance of mineral dressing jigs. Lengthy, far reaching studies and test were carried out by IHC. These resulted in a development of a greatly improved jigging cycle, where the harmonic motion of the conventional eccentric-driven jig is replaced by an asymmetrical saw-tooth movement. IHC Holland offers two possibilities to perform this task: a mechanical drive and a mechanical-hydraulic drive depending on the number of modules. The JIG has been successfully used on onshore and offshore dredgers and mines, for separating minerals like tin, gold, diamonds and iron ore.

Introduction

Introduction

The feed enters the jig in the centre and flows radially over the jig bed towards the tailing chute. The jig bed usually consists a layer of coarse heavy particles, the ragging, placed on the jig screen, and the mixture of sand and mineral particles, fed as a slurry on top of the ragging, also penetrating into the ragging. The saw-tooth movement causes the heavy and coarse grains to pass rapidly through the bed, while the fine sand and lighter minerals take more time to penetrate through the ragging and screen, to be drawn of as concentrate.

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A sampling on an IHC 12 module jig, installed on a tin dredger demonstrated that

the IHC drive mechanism attained an over 95 percent recovery.

Design of the JIG installation

Dedication to technical excellence, long experience and feedback form a large client base have underpinned development of the IHC JIG installations, a high recovery, versatile, simple and robust piece of mining equipment. The IHC JIG installations have been designed for those who must separate mineral grains cost-effectively.

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Design of the JIG installation

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Design of the JIG installation

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Of the various mineral dressing methods, gravity concentration is a simple and widely used process to separate mineral grains of

different specific gravities.

Saw-tooth movement

The JIG saw-tooth pulsation pattern, developed by IHC is superior to conventional patterns in eliminating or reducing hutch water requirement and improved recovery capability of the fine valuable minerals.

The saw-tooth movement consists of a upward and a downward stroke. In order to prevent los of fine ore during upward stroke, the aim has been to produce a fierce upward stroke of short duration. The downward stoke also called suction stroke is much longer; the fine particles are now being drawn into the bed.

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IHC drive system

IHC Holland offers two types of drive system to accomplish the saw-tooth movement: Mechanical drive system

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Mechanical-hydraulic drive system Each system has its own features, and the choice which drive system to use will depend on the number of modules to be operated. One or two modules will be driven by the mechanical drive system, while jigs having more than two modules will be driven by the mechanical-hydraulic system. Power requirements Both drive systems have a considerably low power consumption per driven module. Flexibility of stroke and frequency adjustment Both drive systems have continuous speed regulation feature; for changing the stroke the jig must be stopped to adjust or change the cam. Stroke pattern adjustment The drive system characteristics can be changed over a very wide range, and also almost any type of curve can be provided. Installation and serviced requirements Both drive systems can be installed and serviced with normal technical skill and care.

The JIG is a remarkable concentrator with the capability of handling large tonnages and thereby coping with widely fluctuating loads, not only in volume but also in pulp density and grain size. It can take feeds coarser than 25mm and as fine as 0.06mm and will concentrate a wide range of minerals such as diamonds, gold and tin.

Grain size

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Grain size

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Employment of the JIG installation

The JIG installations are available in different sizes; ranging from a normal feed of 20 cu. mtr/hr to 225 cu. mtr/hr with a maximum power consumption of 4.50 kW respective 27.50 kW. The operation weight varies from 11 220 kgs to 125 000 kgs. Specifications of the complete series are shown in the table. Mineral dressing is a necessity in practically all mining operations in order to process the mined ore to marketable products. The JIG installation can be used in variety of mining projects, onshore as well offshore for separating minerals.

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Employment of the JIG installation

Type Nominal

feed Nominal

feed

Power demand norm.

Power demand

max.

Construction

weight Operation

weight

(cu. m/hr) (cu.yr/hr) (kW) (kW) (kgs) (kgs)

JL-01-E 20 26 3.30 4.50 5 100 11 220 JL-02-E 40 52 6.00 7.30 9 600 19 830 JL-03-E 55 72 8.00 12.00 16 800 35 500 JL-04-E 75 98 8.00 12.00 20 700 45 140 JL-05-E 95 124 10.50 14.50 26 000 56 900 JL-06-E 115 150 12.50 17.50 28 000 65 000 JL-6/2-E 150 196 13.50 19.00 36 000 83 800 JL-6/4-E 1 190 248 16.00 23.00 43 000 101 000 JL-6/4-E 2 190 248 18.50 26.00 45 000 110 000

JL-6/6-E 225 294 20.00 27.50 50 000 125 000

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Employment of the JIG installation

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Nature has given the example by creating alluvial, eluvial and residual ore deposits, in which gravity

separation had played a dominant role.

Recovery IHC JIG

IHC has undertaken theoretical and practical research into the design and performance of mineral dressing jig. These resulted in the development of a greatly improved cycle. Below some recovery examples are shown for diamonds, tin and gold. Diamonds One module type jig was quite exhaustively tested for diamond beneficiation whereby the preliminary conclusion was that the jig fed at a feed rate between 5 and 6 metric tonnes per hour, proved to be better than 95 wt % efficient on recovering diamonds of - 4 mm to + 0,5 mm range. Tin After adjusting18 primary jig type the recovery of tin increased from 95% to 99%. This sampling at an open pit mine in Thailand proves that the lower strokes per minute results in a better recovery than the higher jigging frequency. Gold The results on gold recovery on a gold dredger, shows no losses. The recovery on this sample is 99% with a three stage jig installation.

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Advantages of the IHC JIG

The advantages of the IHC JIG comparing to the conventional jigs are: Reduction of pulp flow velocity over the jig bed. Good pulp distribution over the total jig area. Significant reduction of hutch water requirement. Increased handling capacity per unit of jig area. Low power pulsing mechanism.

In terms of dredge design and operation these features mean: Simplified distribution system. Ability to handle coarser feed material. Improved recovery of fine grains. Improved performance under overload conditions. Smaller total treatment plant area. Reduced total height of treatment plan. Reduced running cost because of no or minimal hutch water

requirement and low power jig drive.

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Standard JIG range

IHC JIG installations are available in various types. The standard JIGs are suitable for separating a wide range of minerals. Out company specialist will be glad to help you with advice on the application of the most appropriate JIG installation.

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Standard JIG range

Type Length Breath Height Length of skid Breath of skid

(m) (m) (m) (m) (m)

JL-01-E 6.50 2.10 5.50 4.35 1.70

JL-02-E 7.20 4.00 5.50 5.00 2.45

JL-03-E 9.70 6.10 10.00 7.10 3.60

JL-04-E 11.50 6.10 10.00 8.80 3.60

JL-05-E 13.00 6.10 10.60 10.20 3.60

JL-06-E 16.30 4.60 10.60 10.20 4.00

JL-6/2-E 16.30 7.90 10.60 10.20 / 4.00 4.00 / 3.50

JL-6/4-E 1 16.30 8.70 10.60 10.20 / 6.50 4.00 / 4.00

JL-6/4-E 2 18.00 8.70 10.60 10.20 / 6.50 4.00 / 4.00

JL-6/6-E 18.00 8.70 10.60 10.20 / 8.20 4.00 / 4.00

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Standard JIG range

JL-01-E 20 cu.m/hr

JL-02-E 40 cu.m/hr

JL-03-E 55 cu.m/hr

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Standard JIG range

JL-04-E 75 cu.m/hr

JL-05-E 95 cu.m/hr

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Standard JIG range

JL-06-E 115 cu.m/hr

JL-6/2-E 150 cu.m/hr

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Standard JIG range

JL-6/4-E1 190 cu.m/hr

JL-6/4-E2 190 cu.m/hr

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Standard JIG range

JL-6/6-E 225 cu.m/hr

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