The Mountain Goat Gold Trommel is a reverse helix system built on the same principle as the huge mining trommels used by large placer mining companies all over the world, but this is light (16 lbs) and portable, so one person can carry it out into the field. It is a miniature version of the huge trommels used by most major placer mining companies for the last 100 years. It is not to be confused with gravel pit trommels, though, which are designed to classify gravels. Speed up your gold processing work and increase gold recovery with the Mountain Goat Portable Trommel. This machine is aptly named because it can eat almost anything and is light enough to carry up a mountain! This machine is a real workhorse -- it can eat up as much as 2 yards of placer gravel and spit out as little as 10 pounds of concentrates in only 8 hours!
The 4-inch Mountain Goat Trommel is very efficient because the spiral riffles inside of the tube turn and bring the heavy materials up to the high end of the tube while allowing the lighter materials to flow out of the back of the tube as tailings. This system makes the trommel self-cleaning, which eliminates the need to break down for clean-up as is necessary in sluice box type equipment. The spiral riffles in the trommel tube are .25 inch deep and spaced .75 inches apart. We suggest your placer material be screened to .5 inch or less. There is a nugget trap at the low end of the tube which should be checked regularly for nuggets larger than .25 inch. Do not put rocks larger than half inch into the hopper because the larger rocks can jam the riffles against the spray tube and cause you to have to shut down to clear the jam. Metal retractable legs adjust to 3 heights (see example below). Handle is molded into the trommel body. The Mountain Goat can be used directly in a stream and is a very sturdy machine designed to take a lot of wear and tear! When using the Mountain Goat Trommel away from a running water source, we suggest you purchase a concrete mixing tub (the large size) and a bucket from your local home improvement store such as Home Depot or Lowes. The taillings bucket must be emptied before overflowing to keep gravel out of the water supply. You should also slip a sock over the pump to help keep the the spray system from clogging up.
Manufacturer recommends that you use a 12-volt battery with at least 17 amperes or more, which will run the machine about 3 hours at the right speed. The larger the battery, the longer the machine will run at the right speed. Always make sure that the red clip is on the positive (+) side of the battery. If you revers the clips, the barrel and the pump will turn backwards and no concentrates will be generated. It is not recommended that you run the trommel directly from a battery charger without a battery in the circuit. The trommel is designed to operate on 12 volts, but most battery chargers give out 18 volts, which will cause the Mountain Goat to run 150% the normal speed and kick out the material too fast to be concentrated. TIPS: Use a wetting agent in your water supply to prevent fine gold from floating out into the tailings. If you are running oily beach sand, add a tablespoon of 409 cleaning solution to your water supply. Desert Fox Spiral Panner (variable speed) is a compact, light-weight gold panning machine you can take anywhere. Weighing under 10 pounds even with a rugged folding stand, it folds up and stores neatly in its Action Packer tub. Operate it right out of the tub, or remove it from the case and use it in a stream. The Desert Fox spiral wheel has 7 separate spirals which pick up GOLD 7 times with each rotation of the wheel (105 times per minute). The seven spirals dump gold into the tube-shaft and into a hanging gold catch-cup. The Desert Fox's pitch adjustment and water spray system help you tune out the black sand. The Desert Fox Automatic Gold Panning Machine is aptly named because it was designed to conserve water and will operate on just three gallons. It sets up quickly and easily and can run 70 pounds of concentrates in an hour-- it's both a separator and a concentrator in one self-contained panning machine. Recovers an amazing amount of flour gold so you never lose even the smallest pieces (which all add up!). Operates on any 12-volt automotive battery or even a 35 watt solar panel. Ships complete with an owner's manual and small bag of practice sand containing real placer gold so you can get acquainted with your new machine right away. But the Desert Fox Spiral Wheel is so easy to operate you won't even need it to become a pro! Desert Fox Specifications:
In Mineral Processing, the SPIRAL Classifier on the other hand is rotated through the ore. It doesnt lift out of the slurry but is revolved through it. The direction of rotation causes the slurry to be pulled up the inclined bed of the classifier in much the same manner as the rakes do. As it is revolved in the slurry the spiral is constantly moving the coarse backwards the fine material will flow over the top and be travelling fast enough to be able to work its way downwards to escape. The Variables of these two types of classifiers are The ANGLE of the inclined bed, this is normally a fixed angle the operator will not be able to adjust it.
The SPEED of the rakes or spirals, the DENSITY of the slurry, the TONNAGE throughput and finally the SETTLING RATE of the ore itself.To be effective all of these variables must be balanced. If the incline is too steep the flow of slurry will be too fast for the rakes or spirals to separate the ore. If the angle is too flat the settling rate will be too high and the classifier will over load. The discharge rate will be lower than the feed rate, in this case. The load on the rakes will continue to build until the weight is greater than the rake or spiral mechanism is able to move. This will cause the classifier to stop and is known as being SANDED UP. If the speed of the rakes or spirals are too fast, too much will be pulled, out the top. This will increase the feed to the mill and result in an overload in either the mill or classifier as the circuit tries to process the increased CIRCULATING LOAD.
The DENSITY of the slurry is very important, too high the settling will be hampered by too many solids. Each particle will support each other preventing the heavier material from quickly reaching the bottom of the slurry. This will not allow a separation to take place quickly. The speed at which the slurry will be travelling will be slow and that will hamper effective classification. Another variable is the TONNAGE. All equipment has a limit on the throughput that anyone is able to process, classifiers are no different. This and the other factors will have to be adjusted to compensate for the last variable, the ore itself. Every ore type has a different rate of settling. To be effective each of the previous variables will have to be adjusted to conform to each ones settling characteristics.
The design of these classifiers (rake, spiral, screw) have inherent problems, First, they are very susceptible to wear, caused by the scrubbing action of the ore, that plus all of the mechanical moving parts create many worn areas to contend with. The other problem that these classifiers have is that they are easily overloaded. An overloaded classifier can quickly deteriorate into a sanded-up classifier. Once that happens the results are lost operating time, spillage and a period of poor Mineral Processing and Separation performance.
Another mechanical classifier is the spiral classifier. The spiral classifier such as the Akins classifier consists of a semi-cylindrical trough (a trough that is semicircular in cross-section) inclined to the horizontal. The trough is provided with a slow-rotating spiral conveyor and a liquid overflow at the lower end. The spiral conveyor moves the solids which settle to the bottom upward toward the top of the trough.
The slurry is fed continuously near the middle of the trough. The slurry feed rate is so adjusted that fines do not have time to settle and are carried out with the overflow .liquid. Heavy particles have time to settle, they settle to the bottom of the trough and the spiral conveyor moves the settled solids upward along the floor of the trough toward the top of the trough/the sand product discharge chute.
Spiral Classifiers is art of separating the solid particles in a mixture of solids and liquid into fractions according to particle size or density by methods other than screening. In general, the products resulting, a partially drained fraction containing the coarse material, called the underflow; and a fine fraction along with the remaining portion of the liquid medium called the overflow.
The classifying operation is carried out in a pool of fluid pulp confined in a tank arranged to allow the coarse solids to settle out, whereupon they are removed by gravity, mechanical means, or induced pressure. Underflow materials will be sent back to the ball mill for re-grinding to make a close-circuit, overflow materials will come to next stage of beneficiation.
Normally, there are two types of spiral classifier, high weir type and submersion type. High weir type, the overflow spiral blade is higher than overflow level, but spiral central is lower than overflow surface. The high weir spiral classifier is applied in the classification of minerals with particle size 0.83-0.15mm. Submersion type, spirals are totally under overflow level, which is applied with particle size 0.15 to 0.07mm.
Spiral classifier and hydrocyclone are the main equipments for the classification operation of the concentrator. Although the rapid development of the cyclone once made the spiral classifier lose its market, but with the continuous changes in the requirements of the selection plant, it was found that the spiral classifier also has its advantages. The spiral centrifugal classifier has the advantages of strong continuous operation, large processing capacity, low energy consumption per unit output, and convenient maintenance. It can handle particles with a diameter of 1um-10mm. The horizontal spiral centrifugal classifier adopts the method of wet classification, and its processing capacity can reach 1~20 (m3 slurry) kg/h. It is widely used in minerals, metal powders, chemical raw materials, pigments, fillers, etc.
The screw classifier is based on the principle that the solid particles are different in size and specific gravity, so the settling speed in the liquid is different. Fine ore particles float in the water and overflow, and coarse ore particles sink to the bottom of the tank. Spiral classifier is widely used in beneficiation plant to match with ball mill to form a closed circuit circulation path to distribute ore sand. Filter the material powder milled in the mill, and then use the spiral piece to screw the coarse material into the ball mill inlet, and the filtered fine material is discharged from the overflow pipe. There are four classifiers: high weir single spiral and double spiral, submerged single spiral and double spiral.
The spiral classifier is widely used in the classification of the grinding circuit of the concentrator and the operations of washing, desilting and dewatering. Its main advantages are simple equipment structure, reliable work and convenient operation.
1. It is used for the separation of machine-made sandstone powder, which can control the content of machine-made sandstone powder very conveniently and meet the requirements of users.2. It is suitable for dry technology large and medium-sized sand production lines.3. The content of 0.000.75mm stone powder can be adjusted between 2%-15%.4. Stone powder quality is easy to control, fineness adjustment is convenient, flexible and reliable.5. Using frequency conversion control technology, the operation is more concise.6. It can be connected with the mill in the closed circuit of the grinding circuit. Compared with hydrocyclone, the power consumption is lower.7. The main disadvantage is that the classification efficiency is low, the equipment is bulky, and the floor space is large. Due to the limitations of equipment specifications and production capacity, it cannot generally form a closed circuit with a ball mill of 3.6m or more.
The spiral classifier is divided into two types: high weir type and submerged type. High weir classifier is suitable for coarse particle classification, the maximum size of overflow is generally 0.4~0.15mm; submerged classifier is suitable for fine particle classification, the maximum size of overflow is generally below 0.2mm.
DOVE Trommel Screens are designed as highly efficient, rugged and economical solution for screening and classification of wide range of material, as well as to optimize the subsequent processing steps of recovery. Screening allows reducing investment and operating costs, and increasing the products quality with a rapid and large volume processing. DOVE offers the largest range of Trommel Screens of different types and specifications, with a wide range of the processing capacities from 5 tons/hour up to 1000 tons/hour, per single Trommel Screen.
Supplied in various types and configurations: Scrubber Drums, Scrubber Screens and Classifiers, Double Screen Trommels, Cone type and etc. DOVE Trommels are supplied both in wet and dry configuration. Portable and stationary configurations are available.
WE HIGHLY RECOMMEND FORWARDING SOIL SAMPLES OF YOUR MINE TO US FOR ANALYSIS, IN ORDER TO DESIGN AND RECOMMEND THE MOST EFFICIENT PROCESSING PLANT, TAILOR MAID TO YOUR MINE REQUIREMENTS, FOR HIGHEST PRODUCTION RECOVERY.
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