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In Canada, there are financial incentives to extract magnetite from mine tailings for export. Whitehorse Yukon has a rich magnetite deposit of this type with interest to see partner or buyer getting to the steel mills. The two ores of iron are hematite and magnetite with the chemical formula Fe2O3 and Fe3O4 respectively. To determine which of the compounds has a higher percentage of iron per kilogram first the molar mass of the two compounds has to be determined.
Iron has a molar mass of The molar mass of Fe2O3 is Iron ore pellets are made from both magnetite and hematite ores. Hematite ores are concentrated using a flotation process. Much of the ore in pellets made from magnetite is oxidized to hematite during the high-temperature induration process that sets the binder. Direct shipping lumpy ore is now very scarce. Fine iron ore must be agglomerated before being fed to a blast furnace either by pelletizing or sintering, which is normally done at the steel mill.
Fine iron ore cannot be fed to a blast furnace, or it will plug. Sintering also provides a means to recycle steel mill wastes, including pellet chips, pit scrap and BOF dust. Atomic weights of Fe at 56 and oxygen at In nature magnetite often contains impurities in the ore which makes the Fe content of mined ore lower than hematite.
As stated the impurities in magnetite can be removed via processing often resulting in an Fe percentage higher than hematite. This is the key difference between magnetite and hematite. Moreover, magnetite has higher iron content than hematite; therefore, its quality is higher.
Apart from that, in colours too, there is a difference between magnetite and hematite. Magnetite is black in colour, but hematite has a variety of colours. However, magnetite has a black streak, whereas hematite has a reddish brown streak.
As another difference between magnetite and hematite, hematite is a component of rust, but magnetite is not. Moreover, when considering the magnetic properties of the two minerals, magnetite is a naturally strong magnet, but in hematite, magnetism occurs upon heating. In addition to that, one other difference between magnetite and hematite is their structure. Hematite has a rhombododecahedral crystal structure while, magnetite commonly shows octahedral crystal structure. Magnetite and hematite are important oxides of iron.
Available here 2. Available here. Dyed magnesite counts! Send your magnesite pictures to tips wire-sculpture. Click to Receive Daily Tips by Email. I love your gem profiles!! Rose Here In Brainerd Mn 15 miles away is he Cuyuna range mind pits very famous the Iron oar mine pits for a years I have a rare real Hemitite that i got from the science museum in crosby they study gems, and minerial. I have some pictures of the red roads from the mines and i can take more pictures They are believed to be the first mine pits in the country.
I look forward to the jem profiles. Thank You. Joan Kraus. I know I cannot use magnetic clasps around him, but what about hematite? Your email address will not be published. By Judy Ellis on September 28, Silver wrapped hematite pendant by Kathy Eastman.
Gem Profile August Desert Rose. Gem Profile June Rutilated Quartz. Gem Profile June 7: What is Rhyolite? Rose September 28, at am. Brenda Sigafoos September 28, at pm. These dissimilar properties can cause differences in industrial processes e. It might also be vital to identify and gather information from different oxide or slag layers as they often contain information regarding different chemical processes e. This blog gives a brief introduction and a few examples regarding some aspects of time-gated Raman iron oxide measurements.
Other iron oxide detection and separation methods include techniques based on X-ray spectroscopy and techniques that rely on differences in the iron oxide magnetic properties [2, 3]. These methods often require sample preparation e. Several emission and absorption spectroscopy techniques provide elemental information.
However, there are many cases where elemental information is not sufficient and molecular or crystal structure information is needed. Metal oxide determinations are important in many industrial fields and techniques that atomize or ionize samples often lose a significant part of the original composition and structure information. Vibrational spectroscopy methods like Raman spectroscopy, however, provide information regarding the molecular structure.
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