Feeders and Conveyors

Calculating Stockpile Capacity

Calculating Stockpile Capacity: Once the minimum storage capacities which will assure maximum mill output are known, the appropriate stockpile configuration must be determined. Stockpiles fall into two general categories: conical and elongated.

Conical Stockpiles

The conical stockpile is the simplest and easiest to analyze. The total stockpile capacity is given by:

3.14 (Tan A)R³ D/3000 = capacity in metric tons…………………(1)

where: R = stockpile radius in meters
A = angle of repose for material to be stockpiled
D = density of material in kg/m³

Note that the capacity of the conical stockpile varies with the cube of the radius of the pile. This means that the capacity of the conical pile grows very rapidly as the height (and hence the radius of the pile) increases. Increasing the height of the stockpile by 26% results in a doubling of the stockpile capacity. One should also observe at this point that one-half of the capacity of the stockpile is in the lower 1/5 of the pile. This fact will become important later in considerations of live storage capacity.

For many common materials, the angle of repose, A, is about 38 degrees. Substituting this value for A reduces Equation 1 to:

8.18 x 10 -4 ….Read more

Vibrating Feeders

Electric Vibrating Feeder

The Electric Vibratory Feeder is a vibrator that provides an extremely efficient, simple and economical solution to the problem of making the most stubborn material flow freely. No longer need there be a sticking together of wet ore in the ore bin, or the arching over and hanging up of materials in hoppers and chutes with resulting lowered operating efficiency.

vibrating ore feeder Syntron Electric Vibrator Operating on Pyramidal Hopper Feeding Ore onto Conveyor Belt—Note Compactness and Rugged Construction

The powerful vibration of the simple, electro-magnetic vibrator is controlled by a separate, wall-mounted “Controller,” which is furnished with each vibrator. The dial rheostat in the controller varies the power of vibration. By merely turning the manual dial rheostat the power of vibration can be turned down to provide the most effective vibration required for the purpose. The controller is in a separate, dust-proof housing, arranged for wall-mounting at any desirable distance away from the vibrating mechanism attached to the bin, hopper, or chute.

These vibrators are furnished in many different sizes. Units are available that range from those equipped to handle large tonnages in ore bins down to the small noiseless model best suited ….Read more

Apron Feeders

Apron Feeders must always be employed to ensure that the feed to a crushing machine is drawn at a constant rate from the bin which serves it. Of the many designs in existence by far the most widely used are the apron and pan feeders, although the Ross Chain Feeder is coming into favour for handling coarse ore.

Aggregate production plants have components such as feeders and scalping units to direct material to be crushed, separated, or stored for later use. Feeders are used mainly to handle input material for the plant. They are of two types: the apron feeders and mechanical, or reciprocating-plate, feeders.

Apron feeders or grizzlies are generally used to feed quarry rock into a primary crusher. They are of a heavy-duty construction to take the shock from rocks dumped directly on them. To cushion the blow of material dumped on the feeder, a large hopper may be used to receive the dumped loads. The apron feeder consists of a series of overlapping pans or plates which form a continuous chain like a conveyor belt. They are generally installed on a slight decline and driven to throw material in the downward direction. Widths of feeders range from one ….Read more

Bin Discharge Gates

Rack and Pinion Bin Discharge Gate

(Rack and Pinion) Bin Gate consists of a steel plate door, steel shaft, cast iron guides, hand wheel, pawl, rack, and pinion. These parts are all built of the best materials, carefully machined and assembled. This type of gate meets the need for a simple means of control of flow of dry materials from a bin. Rugged construction of rack and pinion assures long operating life.

Rack and PinionSize no.

Radial, Duplex and Undercut Bin Discharge Gates

Type “A” Radial Bin Gate is designed for attaching to the horizontal bottoms of bins. The quadrant swings freely and is self-closing. The quadrant cuts through the stream of material to stop the flow with no chance for large lumps to foul the closing action of the gate. The throat is a heavy casting and lever may be furnished cast integral with the side plates or as a separate steel bar on most sizes.

Type A Radial Bin

Type “B” Duplex Gate is opened by a downward movement of the lever and closed by gravity when released. The two gate plates ….Read more

Reagent Distribution Systems and Feeders

Electric Vibrating Feeder

The Syntron Electric Vibrating Feeder is built on the same simple and strong principles as the Syntron Electric Vibrator. The vibrating trough is carried on two leaf springs and vibrated through the pulsating current of an electro-magnet. The speed of this magnet is controlled by a separate electric controller, which is furnished with each feeder. This controller is a totally enclosed unit arranged for mounting on a wall, either close to or quite a distance from the feeder. A manually operated dial rheostat controls the speed of the pulsating magnet and the flow of the feed. By a simple turn of the rheostat in the controller the feed can be changed from a thick, fast flow to a slow, minute one.

These feeders can handle practically every kind of dry feed, give accurate reagent control; even feed to a screen, crusher or conveyor. They can be supplied for suspension-mounting in the larger sizes, as well as the standard floor- mounting on a heavy base. Due to construction there is no wearing of mechanical parts, or abrasion of trough.

A variety of different sizes is available from the small reagent feeders, up to the “Heavy Tonnage” model, which will handle up ….Read more

Types of Small Ore Feeders

Adjustable-Stroke Belt Ore Feeder

The Adjustable -Stroke Belt Ore Feeder is preferred for feeding the grinding mill because of its smoothness of operation, uniformity of discharge, and regulation of feed. It is so arranged that it can be installed to draw the feed from the bottom or the front of the ore bin. Various lengths are available to fit the various requirements.

The tonnage of feed can be regulated by a wide range of belt speeds or by regulating a sliding gate fitted on the front of the feed hopper, or if necessary, an adjustable opening is built into the ore bin to give further control.

The frame is made of structural steel and supports a steel hopper, head and tail shafts and the necessary closely spaced flat belt idlers which are located under the feed hopper to support the ore in the bin. A heavy rubber belt ensures long life. Variable belt speeds ranging from 0″ to 15′ per minute are accomplished by the use of an adjustable feed control which is regulated by a handwheel conveniently placed on the frame away from belt.
Additional data gladly furnished upon request.

Adjustable Stroke

Belt <a href=….Read more

Types Belt Conveyor

The type of belt conveyors are used to transport various materials over relatively short distances both horizontally and on an incline where the angle of the latter does not exceed 21° to 23° in exceptional cases. The material can be of almost any size and either dry or wet, but in the latter case the moisture content must be known and taken into consideration when figuring such installations. Usually the belt is supported at regular intervals by troughing rollers on the carrying side, while a number of flat rollers are needed for the return side.

Conveyor belting designed for the particular service is usually rubber covered, the upper or wearing side in many instances being further reinforced by an extra thickness of “tread” rubber which may or may not extend to the outside edge of the belt, while the under or pulley side has only a thin coat to protect the duck. Duck for conveyor belting ordinarily weighs 28 to 42 ounces and the plys from 3 to 8 depending on the factors of length of conveyor, width of belt, size of head and tail pulleys and the weight and character of material to be handled.

Supports for conveyors are ….Read more

Electromagnetic Separation

Starting with a mixture of any of the above minerals it may be determined whether or not they can be separated by high tension, magnetic, or gravity methods and whether any one, or a combination of “Electromagnetic Separation” methods is required. If the minerals appear in different columns they may be separated by high tension and/or magnetic methods alone. Two or more minerals appearing in the same column can be separated by gravity concentration if they have sufficient difference in gravity (usually a difference of approximately I.O).

It should be noted that grain shape and/or size may alter separation characteristics. This is sometimes a detriment and other times useful. As an example, mica and quartz may in many cases be separated by high tension due to their grain shape.

Minerals behaviour characteristics shown are from tests made in our laboratories rather than theoretical. Mineral characteristics and behaviours sometimes vary from different deposits. The behaviour of minerals not shown can usually be predicted by the behaviour of similar minerals in the below table.

Electromagnetic Separation response by Minerals

Electromagnetism by Mineral

Electromagnetic_Separator….Read more

Crushing Plant Flowsheet & Design-Layout

In the crushing section, the ore as it comes from the mine is broken down dry to a size suitable for the wet grinding machines ; these can, if necessary, be made to take lumps of 2-in. size, but they work much more efficiently if their feed is ½ in. or less. Before the advent of the Symons cone crusher the usual practice was to make a 2-in. product in two steps consisting of a primary breaker of the jaw or gyratory type followed by a secondary gyratory crusher. If anything smaller were desired, a third stage was added comprising coarse crushing rolls in closed circuit with a screen. The Symons cone crusher, however, will take the discharge of the primary breaker and crush it to 3/8-in. size in one pass more cheaply and efficiently than is possible with rolls. A screen is usually placed ahead of the cone crusher in order to bypass material that is already small enough and so to relieve it of unnecessary work, but there is no necessity to screen the discharge, as must be done in the case of rolls; the crushing elements are so designed that the finished product is made in one pass ….Read more

Rotary Filter Internal Piping & Manifold

This insides (Internal Piping) of a Disk or Drum Rotary Filter and its Manifold are much similar to each other.

inside rotary filter assemblyEach of the sectors are attached to what is known as the MANIFOLD. The purpose of the manifold is provide a series of passages for both the vacuum and the air. Each passage services one sector from each one of the discs that make up a filter. The sectors are attached to the manifold by RADIAL RODS. Each of these rods hold one edge of each of two sectors.cross-section

The timing in which the air and the vacuum is applied to the manifold is controlled by the FILTER HEAD. By revolving the head either clockwise or counter-clockwise, the position that the disc is at when the air is injected into the sectors, may be adjusted.

In this explanation of the components of the disc filter there are of course the TRUNNION BEARINGS, these support the filter, and the DRIVE LINE. This consists of a MOTOR, a VARIABLE SPEED GEAR REDUCER, PINION GEAR and BULL GEAR.

The bull gear assembly is attached to the trunnion bearing and ….Read more

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