Magnetite is used in dense media circuits in coal beneficiation in the form of a very fine powder, it is added to water to form a Heavy Media Slurry that has a higher specific gravity than water alone. Separation is achieved between those mineral particles which have a specific gravity less than the specific gravity of the slurry and which float while those mineral particles which have a higher specific gravity than the slurry sink
|Percent magnetic||Not less than 98.5% dry basis at 70 millitesia or 700 gauss in a Davis Tube Test|
|Mass Density||Not less than 4,900 kg/m3|
|Mesh Size||Not less than 88% passing 45 microns or 325 Mesh|
|Specific saturation moment||Not less than 80 gauss/gram or 80 Am2/kg|
|Specific susceptibility||Not less than 0.050 gauss/g/oersted or 6.28 x 10-4m3/kg|
|Coercive force||Less than 50 oersted or 4000 A/m|
|Magnetic Properties (as determined in a vibrating sample magnetometer)|
|Fe3O4 [Magnetite Content]||99.5%|
|Specific Gravity||4.90 - 5.15|
|Mesh Size||45 Microns or 325 mesh passing 90%|
|Fe content||68 - 70%|
|* Mesh size can be customized according to the needs and requirements.|
Magnetite is an essential part of the "heavy media" process in coal mining. In the form of a very fine powder, it is added to water to form a Heavy Media Slurry that has a higher specific gravity than water alone. When coal from the mine is pulverized and added to the slurry, the heavier waste materials, such as rock particles, will sink and separate from the lighter coal. The heavy impurities are then siphoned from the bottom of the slurry and the light coal is skimmed off the top. Using magnets, magnetite can be easily recovered from the waste and coal streams and then re-used in the coal separation circuit. Recycling the magnetite provides a cost saving to the operator, and is an environmentally conscious method of utilizing this valuable resource. About 90% of the magnetite can be recovered for reuse from the process, but the remaining 10% must be must be replaced.
When used as the aggregate portion of a concrete mix, magnetite increases the density of the concrete to twice that of standard concrete. This so called "heavy concrete" has become a common building material in nuclear plants as well as (in brick form) for the mitigation of radiation in x-ray facilities. Beyond that, however, heavy concrete is used to make counter weights and as thermal mass in heat storage situations. The most common and growing use is in the design and building of passive solar collection in domestic housing. Still in its infancy, this application has grown out of the search for more efficient heat retention beyond that offered by standard concrete.
The denser the material, the greater its thermal retention properties, and heavy concrete offers twice the mass in the same volume as standard concrete. Being just as strong and flexible as standard concrete, it can be used in the very same applications and offer substantially improved thermal characteristics.
Sand and gravel bed filters used by many municipal water treatment plants can realize benefits by using heavier aggregates in the sand bed.
The heavier specific gravity of magnetite aggregates allow a more aggressive backwash in the cleaning phase without loss of product, and because magnetite is magnetic it can be easily scavenged back from waste water streams for reuse.
This is a relatively new market for Micrex and is based on certain plastic producers' search for a denser end product. Some plastic products (pipeline cleaning "pigs" for instance) can benefit from added weight. Magnetite can be added as a very fine powder to the plastic mix to increase the weight.
Magnetite is an excellent source of iron for the production of iron-based chemicals like ferric chloride and ferric sulphate, that are used as alternatives to aluminum hydroxide. Aluminum hydroxide is used to help clarify raw water in municipal water purification plants, but concerns about aluminum in drinking water have prompted consideration of alternative chemicals.
Other chemical uses include high iron fertilizers, pigments and sediment control products.
The dark, glossy magnetite ore is a desirable specialty accent rock for landscaping.
The products in the Magnetite range have been developed and processed to provide an iron oxide capable of being used in a wide variety of different applications, for example:
Catalysts - for production of ammonia and synthetic fuels
Foundry - mouldable chill sand/anti-finning additive; iron oxide additive to foundry sand
Heat storage media - heat retaining bricks for night storage heaters
Heavy media separation - coal washing, scrap metal separation
Iron oxide additive - glass, mineral wool
Most magnets are made from magnetite, from ordinary refrigerator magnets to the enormous, powerful magnets utilized for maglev trains. If you've ever played with magnets, you know that opposite poles attract and like poles repel one another. Maglev or "Magnetic Levitation" trains use electromagnetic propulsion, rather than a traditional engine, which reduces friction and increases speed.
2.Bio-medical Applications for Magnetite
Magnetic Resonance Imaging is the most widely used non-invasive medical imaging method. Researchers and doctors are beginning to use magnetite as a "contrast agent", injected or ingested by the patient to improve the scan's contrast between black and white, for MRI scans. Small, liquid particles of magnetite react to the electromagnetic current of the MRI and increase the efficacy of the scan. Magnetite has also been used in experiments to improve molecular recognition and drug delivery targeting. In holistic medicine, magnetic jewelry made from magnetite is used to decrease pain and increase circulation.
3.Miscellaneous Uses of Magnetite
Magnetite fills a number of other niche uses. Artistically, it is used in some red and brown paint pigments and as a toner in electromagnetic photography, which you may know as "Xerox." When ground into a fine powder, magnetite works as an abrasive added to high-powered water jets used to cut fine jewelry. Because magnetite is an oxygen-rich mineral, it is also added as a micro-nutrient to soil fertilizers
Magnetite as a mineral has a wide variety of uses right from serving as magnetic decor to keeping trains from moving off track. One of the most significant uses of magnetite lies in its iron ore status and its industrial importance in manufacturing steel. Magnetite is also an important component of power plants and is used to generate electricity.
Magnetite because of its magnetic properties is also widely used in compasses and other navigation devices. This mineral also serves as an excellent abrasive that is much cleaner and comes with low toxicity than abrasives that have a silica base.
Magnetite is used to increase the density of the aggregate portion of concrete to twice that of standard concrete. In other words, magnetite if included in concrete provides ‘heavy concrete’ which is today a common building material in nuclear plants. It is also used in the mitigation of radioactivity in x-ray facilities.
The sand and gravel bed filters that are used by many municipal water treatment plants can also benefit by using heavy aggregates in the sand bed. Magnetite can be used as a heavy aggregate since the heavier specific gravity of magnetite aggregates allows an aggressive backwash during the cleaning phase without loss of any product. Magnetite being magnetic in nature can easily be scavenged back after the filtering process from the waste water streams.
Another important use of magnetite is its use in the heavy media process in coal mining. Magnetite can be added to water in the form of a very fine powder to create heavy media slurry that has a higher specific gravity than only water. This mixture allows the heavier waste materials such as pulverized rocks to sink and separate providing you with pure lighter coal. Magnetite, however, can be re-used in the coal upgrading process without the use of industrial chemicals.
Magnetite mixed with aluminium oxide can provide you with an abrasive known as ‘emery’ which is a natural mixture of magnetite and corundum. Producing this abrasive synthetically with the help of magnetite allows control over the particle size and the relative profusion of aluminium oxide and magnetite.
Magnetite is also valued and cherished by alternative medicine practitioners for the healing qualities that it contains. A bracelet of magnetite is used to deal with migraines, anklets made out of magnetite are used for knee joints, heel spurs for problems in the feet and necklaces for back, shoulder or neck problems.
Magnetite being one of the significant ores of iron and the mineral with the strongest magnetic property has many industrial and domestic uses. The above mentioned magnetite uses are among the few of its most important uses.