Equipment Archives | Mineral Processing & Metallurgy

Flour Gold Recovery

Flour gold can be defined as ultra-fine gold found in a low micron size fraction, often smaller than 74 microns or 200 mesh. Reality is that with today’s fine gold recovery equipment, this is a low ways away from the elusive microscopic gold small prospectors want to know how to recover. Falcon’s iCon gravity concentrator, in conjunction with a conventional shaking table, can recover in excess of 85% of GRG gold. A screen analysis of the gold particles has show test samples with as much as 44% of the gold in the -74 microns (-200 mesh) size range. High metallurgical efficiencies of concentration within the size ranges of 1.5 mm (-10 mesh) to about 37 microns (-400 mesh) allows recoveries of trace quantities of contained high specific-gravity minerals from what would otherwise be “plant tailings”.

The iCon i150 and i350 are, for a small miner, high capacity gravity concentrator designed for feed throughputs of 1 to 15 TPH, for feed material finer than 2 mm (-10 mesh) in size. The high-G cones operate at feed pulp densities of 60% to 65% solids (by weight) and ….Read more

Eddy Current Separator

Several types of eddy current separators have been developed in recent years. These separators range from slide chutes lined with alternating permanent magnets to electromagnetic circuits that generate a pulsed field when conducting material is sensed. The illustrated rotating permanent magnetic field eddy-current separator has proven to be most effective in view of capital cost, operating cost, and separation efficiency. Unlike a static chute type separator, the frequency of the alternating magnetic field in the rotating permanent magnetic field eddy-current separator is variable to provide optimum repulsive forces. When compared to an electromagnetic circuit, the high energy rare earth permanent magnets rival the electromagnetic field in strength and consumes no power.

The separator was developed in order to provide processing flexibility. The magnetic rotor is 12 inches in diameter and consists of a series of axial magnetic poles that span the 360 degree circumference. Each magnet extends the width of the rotor and the series is assembled with alternating polarity. The magnetic field strength was maximized employing high energy neodymium-born-iron permanent magnets. A fiber composite drum encloses the rotor. A conveyor belt runs around the drum to deliver feed material to the alternating magnetic field. The speed of the drum ….Read more

Air Swept Mill

In an air-swept mill, the body of which does not differ significantly in general design from a trunnion overflow mill, a powerful stream of air is passed through the mill and removes the finer particles produced by the grinding process. This stream of powder-laden air is then passed through the classifier and the “oversize” material, rejected by the classifier, is returned to the mill with sufficient feed material to maintain the charge at the working level. The layout of such a closed-circuit plant is shown in Fig. 1.5.

The grinding in a batch mill, a grate discharge mill or trunnion overflow mill may be performed either “wet” or “dry” , but clearly in an “air-swept” mill the grinding must be carried out in the dry state.

In “wet” grinding the material to be ground is fed to the mill in the form of a “pulp” containing, perhaps, 50% by weight of water. In dry grinding, however, the granular material is fed into the mill in a sensibly dry condition; the only moisture present being the few percent normally held by the powder. Both the grate mill and the trunnion overflow mill may ….Read more

CHUTE SAMPLER

CHUTE SAMPLER FINDS WIDE APPLICATION ON DRY MATERIALS

Many installations are confronted with sampler arrangements where the material is handled in chutes and installation of samplers either result in excessive dusting or substantial loss of headroom.

The Chute Sampler is a compact, dependable automatic sampler unit which is ready for installation in a chute. Headroom loss is kept to a minimum. The cutter is sealed against entry of material when the cutter is at the rest position. The standard Type “C” Sample Cutter is carried across the stream on a heavy steel plate which acts as one of the sides of the chute chamber. The movable plate is sealed to control dusting.

Chute Samplers are available for both a vertical chute or an inclined chute. Any diameter chute can be accommodated by this design. Complete details will be sent on request.

The Sampler is capable of either continuous or automatic operation. Automatic operation is from 2 to 55 minutes in 1 minute increments.

Precious Metals Melting System

125kw Inductotherm VIP-I Precious Metals Melting System: The furnace was only used for proof of concept in a platinum recovery project and has extremely low hours. It is practically new… It is a top of the line, USA built, VIP- I Inductotherm system using their latest IBGT technology and was specifically designed to handle non-ferrous metals (gold, platinum, copper, brass, bronze, etc.) If stainless steel melting is required, it is very easy to make the modification with this unit. All drawings and manuals included. It was not used in a foundry application/environment and is exceptionally clean. It has multiple cooling and fail-safe systems to protect the furnace should there be a pump failure or power outage during an important melt/casting.

Asking price is $89,000. We can also supply installation support and operational assistance if requested.

Inductotherm 125kw VIP-I (Blue) – Very Low Hours

Power Required: 460 Volt / Three Phase / 60 Hz / 145 kVA / 185 Amps
Output: 125 kW / 1,800 Volts / 2,500 Amps / 3,200 Hz.
Circuit Protection System
Safety Isolation Transformer
Ground/Molten Leak Detector
NEMA 12 Combination Electric Starter

Separate External Closed Water Cooling System

Redundant Dual Coolant Pump Module/Skid (Twin Pumps)
Separate Cooling System Electrical Control Cabinet
Automatic DC water pump in the event ….Read more

Analytical Balance Principle

In this place it will be sufficient to describe the usual chemical balance, designed to carry in each pan a load up to 100 gms. This balance can be obtained at a reasonable figure, and sensitive to 1/10 of a milligram (0.0001 gm.). In the section on Assaying the student will find two other forms—Pulp Scales and the Assay Balance— mentioned. The pulp

Scales are cheap, and sensitive to about 1/100 gm., and serve well for weighing quantities of 20 gms. and over. The assay balance is more sensitive than the chemical balance, but its range is shorter (from .5 gm. to .00005 gm.). The student who understands the chemical balance, its adjustments and methods of checking and weighing, will have little difficulty in using the finer assay balance.

Analytical Balance Parts and Function

The Beam

This is generally made of brass or aluminium, and varies in shape and length. Fig. 40 shows one design (Ainsworth, U.S.A.). A short beam is preferable to a long one, the time of vibration being shortened, and the increased lightness permitting higher sensibility. One end of the beam is always graduated, though it is ….Read more

Laboratory Gravity Concentrator

Rotary Silica Sponge Filter

Core-Oven

The Core-Oven tests here described were made to obtain information regarding costs, efficiency, etc. of baking cores in an oil-fired oven, and two electric ovens, which were installed, early in 1920, in the core room of The Ohio Brass Co. and were used almost continuously during the rest of that year. Operating costs were rather high so a complete test was undertaken early in the last century.

The ovens will be referred to as Nos. 1, 2, and 3. Nos. 1 and 2 are electric ovens of different makes while No. 3 is an oil-fired oven made by the firm that made No. 2. The three are equipped with similar ventilating devices. They have full-height doors at front and rear. The cores are placed on iron racks, which are lifted by Cowan trucks and rolled into the ovens through the front doors. When baked, they are removed through the rear doors. Fig. 1 shows the general plan of the electric ovens while Fig. 2 shows the plan of the oil-fired oven.

Oven No. 1 is 91 in. (231 cm.) wide, 83 in. (210 cm.) high, and 79 in. (200 cm.) deep, inside measurements. The walls are constructed in panels about 18 in. (46 ….Read more

OSA Sample Pumps – Vertical Tank Pump

For pumping and feeding a slurry sample to a On-Stream-Analyzer (OSA), the classic pump to use is a vertical tank pump. The market for such OSA sample pump appears dominated by Metso. Irony is OSA’s are made by Outotec or Thermo Fisher Scientific, but you must go elsewhere to pump your slurry sample to the X-ray. What size should the OSA sample flow be?

Metso Sala Vertical Tank Slurry Pump, Model VF50 O5, complete with high chrome wear parts (casing, impeller, inlet), mild steel tank, steel shaft with no Shaft seal (no gland water required), 5 HP, 380 V, 60 Hz, 3-phase premium efficiency motor, motor plate, v-belt drive and belt guard.

This pump will suit all 3 duties you described of 150 lpm @ 30% solids, solids s.g=3.0 at 30 ft static head, and line lengths of 50 ft, 100 ft, 200 ft. The 5 HP motor is the smallest motor mounted on Metso pumps.

https://www.xore.se