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Minerals and Ores: Natural materials

23-FEB-2016 09:54

    The Earth’s is the main source of minerals and ores. Most of the elements do not found Free State because of their reactive tendencies. Potassium, sodium, calcium, magnesium, aluminium, zinc, iron, lead etc are the metals found in combined state. Minerals are the natural materials in which the metals and their compounds are found in earth.

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    These ores contain good percentage of metal. Hence, we can say all minerals are not ores but all ores are the minerals.

    Abundances of the metals in the Earth's Crust

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    Aluminium is the most abundant metallic element but iron has played a much greater role in human history and is an essential part of everybody, literally! Iron is one of 94 naturally occurring elements. It is a metallic material with a silver-grey colour and metallic lustre. Its Atomic Number is 26 and its symbol is Fe. Iron is found in all parts of the planet. It comprises about 5% of the Earth’s crust but is thought to make up perhaps as much as 80% of the planets core. There are four naturally occurring stable isotopes of iron with at least four unstable isotopes also known to exist.

    Characteristics of a mineral

    • It must occur naturally.
    • It must be inorganic
    • It must be a solid
    • It must possess an orderly internal structure, that is, its atoms must be arranged in a definite pattern.
    • It must have a definite chemical composition that may vary within specified limits."

    Ores

    Ores are those minerals from which metal are extracted conveniently and profitably.

    Types of Ores

    There are mainly four types of ores such as Oxides; Carbonate Ores; Sulphide; Halides Ores.

    Types of Ores

    Element

    Name of Ores

    Oxides

    Aluminium

    Bauxite (Al2O3.2H2O)

    Copper

    Cuprites (Cu2O)

    Iron

    Hematite (Fe2O3)

    Tin

    Casseterite (SnO2)

    Carbonate Ores

    Calcium

    Limestone (CACO3)

    Zinc

    Calamine (ZnCO3)

    Iron

    Siderite (FeCO3)

    Sulphide

    Zinc

    Zinc blende (ZnS)

    Copper

    Copper glance (Cu2S)

    Lead

    Galena (PbS)

    Mercury

    Cinnabar (HgS)

    Halide Ores

    Sodium

    Rock Salt (NaCl)

    Fluoride

    Fluorspar (CaF2)

    Silver

    Horn silver (AgCl)

    Ores and Methods of Extraction of some Common Metals

    Metals

    Occurrence

    Extraction method

    1. Lithium

    Spodumeme LiAl(SiO3)2 Lipidolite

    Electrolysis of fused LiCl/ KCl

    2. Sodium

    Rock salt (NaCl)

    Electrolysis of fused NaCl / CaCl2

    3. Magnesium

    Carnallite (KCl.MgCl2.6H2O)

    Magnesium (MgCO3)

    Electrolysis of fused MgO or MgCl2 / KCl carbon reduction of MgO

    4. Calcium

    Limestone (CACO3)

    Dolomite (MgCO3.CaCO3)

    Gypsum (CaSO4)

    Electrolysis of fused CaCl2/ CaF2

    5. Copper

    Cuprites (Cu2O)

    Copper glance (Cu2S)

     

    Roasting of sulphide partially and reduction

    1Cu2O + Cu2S+     6Cu+SO2

    6. Aluminum

    Bauxite (Al2O3.2H2O)

    Cryolite (Na2AlF6)

    Electrolysis of Al2O3 dissolved in molten Cryolite or in Na2AlF6

    7. Zinc

    Zinc blende (ZnS)

    Zencite (ZnO)

    Calamine (ZnCO3)

    Roasting and then reduction with C

     

    8. Lead

    Galena (PbS)

    Roasting of sulphide ore then reduction of the oxide

     

    9. Iron

    Hematite (Fe2O3)

    Magnetite (Fe2O4)

    Siderite (FeCO3)

    Iron pyrite (FeS2)

    Limonite  (Fe2O3.3H2O)

    Reduction with the help of CO and Coke in blast furnace, chemical reduction with CO, Calcination followed by reduction with CO. Roasting followed by reduction with CO.

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