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magnetic attraction: selecting the right magnets for your application starts with understanding the various options available.

by:Maghard      2020-02-28
Whether the application is in the vehicle shredder yard and the material recovery facility (MRF)
C & D recyclers or slag recovery operations where magnets are able to remove or maintain black material somewhere in these operations.
The size of the can be from 88. 5 tons (
For a copper mine in Chile)
For small head pulleys with only 8 inch diameter, this means that there must be a size to meet the needs of most operations.
In order to properly adjust the size of the magnetic equipment for your crushing system, your supplier needs to know some valuable information about your settings, including: 1. Belt width; 2. Belt speed; 3.
Capacity per ton per hour; 4.
Percentage of magnetic material in feed; 5.
Material description and size range; 6.
Density of material accumulation; 7.
Degree of slot; 8.
Location of the unit; and 9.
The minimum realistic size of the black material to be removed. VARIETY SHOW.
The most common in recycling operations is a large diameter device used to lift a large amount of bulk waste loading or storage materials.
However, what is often overlooked is the magnetic pulley used for conveyor applications through which the supplier is converted into a magnetic separation device.
In the separation system downstream of the automatic shredder, the suspended removes the black material from the residual conveyor, and the shredder drum system is the core of the black recovery operation.
Finally, the vortex separator and the whole
Metal units restore the balance of non-ferrous metals.
Many operators believe that if they have a standard diameter headwheel in their existing system, they can ask for a magnetic pulley of the same size.
This is not the case, however.
Acceleration function of magnetic pulley;
One is to drive the conveyor like a standard pulp, but its second function is to remove the black material.
Suppose you run a belt at 250 feet per minute (FPM)on a 15-
Standard pulley inches in diameter. If a 15-
Using an inch diameter magnetic pulley in this application, the magnetic material may be lost because the centrifugal force can exceed the magnetic force allowed in the volume of the contained in the housing.
This app needs at least 20-
Magnetic pulley of diameter.
If the material is introduced into the pulley at 12 points, the pulley acts as a recovery device when grabbing, holding and carrying the black material.
However, a magnetic pulley has an original back as it also has a non-
Magnetic material, reduce the purity of recycled iron.
When the percentage of black in the feed does not exceed 30% or 35%, the magnetic headwheel is most effective.
In order to provide the best performance, special selection criteria are also required for suspended separation magnets.
This is hung directly on the conveyor or above the head pulley track because the material is in flight and facing the surface of the .
Manual cleaning and self
Cleaning equipment is provided.
Manual cleaning of the suspended will pile up the black material and discharge it into the container. The self-
The cleaning device will drain the magnetic material from the side of the conveyor belt or from the front of the material track at the bottom.
Bear the beast.
Next will consider the magnetic drum used in the black recovery section of the Shredder downstream system.
No matter how you design this part of the system with one drum, two drums or even three drums, how the material is presented to each drum is the main consideration.
There are systems that use a belt conveyor to deliver primary or secondary drums, and there are systems that use an oscillating feeder to present the material to the drum.
Let\'s assume we have a shredder that handles the average capacity of 50 TPH.
Most belt conveyors that deliver primary rollers are flat belts with side skirts to limit the material.
If the belt delivers the main with a width of 60 inch and travels at a speed of 250 feet per minute (FPM)
50 TPH x 2,000 PPT divided by 60 Minutes/hour multiplied by 75 PCF equals 22 CFM (
2,000 pounds per ton, 60 minutes per hour, 75 pounds per cubic foot [PCF]
Measurement of feed density and volume per minute [CFM]).
This means that the feed is well distributed across the belt width.
If the belt speed is reduced, the average depth increases and the depth increases if the belt width is reduced.
Similarly, if an oscillating feeder is used between the main conveyor and the drum, its speed may be only 35 to 50 FPM.
Now, if the feeder is the same width (60 inches)
With the input of the conveyor, the depth of the material in the pot is now increased to five times (at50 FPM)
Or the average burden 1. 05 inches.
Of course, we recognize that the particles are larger (
Close to 4 inch)
But it gives you some insight into the distribution of materials on the belt or pan.
The average load is close to the size of the particles, and non-ferrous materials may produce more interception.
Keep in mind that black particles attract and interact with each other.
This is the so-called threading effect.
If the distance from the feed point increases, a drum with a large diameter is required.
The rules of thumb for Walker\'s magnetic parts are as follows: * 36-inch diameter--
6 inch to 8 inch; * 42-inch diameter--
8 inch to 10 inch; * 48-inch diameter--
10 inch to 12 inch; * 60-inch diameter--
12 inch to 14 inch; and * 72-inch diameter--
16 inch to 18 inch.
Size problem.
When choosing the suspension separation , the smallest realistic black material is of great significance.
Remember this about removing iron with a : \"Small Is Hard\", but \"big is easy \".
\"This means that more magnetic fields are needed to remove a small piece of iron, such as 1/2-inch-by-3-
Inch bolts, compared to a large piece of material, like 1-inch-by-6inch-by-6-inch plate.
The shape also plays a role in the magnetic separation of magnetic materials.
The following are the relevant figures for the strength required to remove the various black pieces from the bare belt: * the 85-year-old sphere; * Cube, 66; and * Nut, 42.
You can see that it takes nearly twice the strength to remove the spherical shape than the nut shape.
The type of scrap being processed or chopped has an impact on material recovery.
If the chopped product is adense spherical, it may be lost but later recycled by the magnetic pulley.
Long pieces, such as plate springs or pipe shapes, are best machined with radial Rod drums, which position the material on the width of the drum rather than along the circumference of the drum.
The more we know about what you intend to crush or process, the chance is to recommend the best equipment for the app.
Mining of non-ferrous metals. Eddy current (EC)
The separation of non-metals also requires some knowledge of the feeding device.
The vortex separator for waste recycling usually has variable belt speed and variable rotor speed.
In most cases, the rotor speed remains at the maximum speed, because the number of pole cuts per minute affects the effect of particles.
Belt speed control the volume of material on the belt that introduces the rotor.
Let\'s say you deal with 20 tons of residue per hour.
You can use the nominal belt speed of 200 FPM.
Let\'s say you want to limit the average weight to 1/2 deep and the material density is assumed to be 40 PCF.
The following is the appropriate calculation of the size of the EC unit: 20 TPH multiplied by 2,000 PPT divided by the time of 60 Minutes/hour 40 PCF is equal to 16. 7 CFM. One-
Half inch depth multiplied by 200 FPM, divided by 12 inch per foot.
3 square feet per minute. Therefore, 16.
7 CFM divided by 8. 3 equals a 2-
Foot width separator.
How is the feed arrangement for the unit?
Typically, using an oscillator, they only run under 35 FPM. With 4-inch to 6-
On the high side, your average burden is 2 inch: 2 inch depth multiplied by 35 divided by 12 inch equal to 5.
83 square feet per minute. Therefore, 16.
Divide 7 CFM by 5. 83 SFPM (
Square feet per minute)equals a 2. 86-
Wide foot feeder.
In this case, the size of the feeder will determine the width of the vortex unit, which is about 2 2 feet wide.
Initially, the success of EC was partly due to the recycling of stainless steel.
But few people are aware of the problems encountered.
When working hardened, the 300 series stainless steel, as in ashredder, is characterized (non-magnetic)tomartensitic (
Partial magnetic).
If this happens on some stainless steel, then the material is not thrown out when the rare earth rotor is used, but is attracted and eventually placed in a black or non-metallic container.
This factor led to the whole-
Metal sorting unit to remove the final non-ferrous metal using a detection sensor.
Recyclers are not only turning to magnets for their adsorption capacity, but also for their ability to enhance the material. NEED A LIFT?
For the scrap industry, as familiar as a lifting , suppliers of these devices will want to know the type of material to be processed, because different bulk densities will affect the quality of the material.
Crane types and manufacturers are very important in specifying dutycycle and payload.
When purchasing magnets to handle sorting and material handling tasks to select the most appropriate equipment, the waste recycler should keep the above criteria in mind.
The author is a product manager and magnetic separation expert at Walker .
, And can reach atmormag @ exec pc. com.
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