It is found as a free element in nature often in combination with ironand in many minerals. Magnetite has been very important in understanding the conditions under which rocks form and evolve. Manganese dioxide is used as the cathode electron acceptor material in standard and alkaline disposable dry cells and batteries. Copper metal architectural structures and statuary eventually corrode to acquire a characteristic green patina. There are six kinds of iron ores and we choose the high grade magnetite, hematite, goethite, limonite and siderite as the steel making materials.
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