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Manganese - Sources, Properties and Applications

Chemical Formula

Mn

Topics Covered

Background

Sources of Manganese

Production of Manganese

Forms of Manganese

Key Properties

Key Applications

Background

Manganese was identified as an element by researchers such as Scheele and Bergman, but it was not until 1774, when Gahn was able to isolate it by reducing manganese dioxide using carbon.

Sources of Manganese

Manganese-bearing minerals are quite common, with oxides, silicates and carbonates being the most common. Minerals such as Pyrolusite (MnO2) and Rhodochriste (MnCO3) rank amongst the most common manganese-bearing minerals. In addition to these sources, many large nodules of manganese (containing about 24% manganese) have been found on ocean floors and could provide another source of manganese.

The main sources of manganese come from the former U.S.S.R, Brazil, South Africa, Australia, Gabon and India.

Production of Manganese

Manganese is most commonly produced by the reduction of the oxide with sodium, magnesium or aluminium. Alternatively it can be produced by electrolysis.

Forms of Manganese

Pure manganese exists in four different allotropes. Of these:

         The alpha phase is stable at room temperature.

         The gamma phase which transforms to the alpha phase at room temperature. It is characteristically flexible, soft, easy to cut and can be bent

Key Properties

         Manganese metal is a grey-white metal that resembles iron

         It is harder then iron, but very brittle

         It is chemically reactive

         It decomposes slowly in water

         Becomes ferromagnetic after suitable treatments

Key Applications

Manganese is an important alloying agent.

         In steels, manganese improves the rolling and forging qualities, as well as strength, toughness, stiffness, wear resistance, hardness and hardenability.

         In aluminium and antimony, manganese additions forms highly ferromagnetic compounds, especially in the presence of small amounts of copper.

It can also be used to produce an amethyst colour in glass

Manganese dioxide or pyrolusite is used for:

         To depolarise dry cells

         To decolourise green glass containing iron

         To prepare oxygen and chlorine

         To assist the drying of black paints

Manganese permanganate is a powerful oxidising agent used in:

         Quantitative analysis techniques

         Medicine

 

Source: AZoM.com

 

For more information on this source please visit The Institute of Materials, Minerals and Mining.

 

Date Added: Oct 14, 2002 | Updated: Jun 11, 2013
Comments
  1. Sangram Mohanty Sangram Mohanty India says:

    If An excess of Mn oxide in the catalysts (Mn/Fe > 0.024) is Incorporation, Why it can lead to a significant decrease in FTS activity with no further improvement in C2–C4 olefin selectivity Carbon nanotube-supported Fe–Mn nanoparticles..?
    Can you give me the reasons.?

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