Background of Ferromolybdenum
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- Category: Molybdenum knowledge
- Published on 09 October 2015
- Written by xinyi
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Molybdenum is a relatively rare element that is not found in metallic form in nature. The molybdenum serves to improve hot creep properties of steel, prevent temper brittleness of steel, and increase corrosion resistance of steel, which is a very important element to manufacture heat resistant steel or to manufacture corrosion resistant steel as an alloy element.
Molybdenite (MoS2) is a primary raw material economically obtained. Generally, a relatively low concentration of about 0.05 to 0.1 wt % molybdenite (MoS2) is included in raw ore; however, the molybdenite is easily recovered and concentrated by froth flotation due to properties of sulfides. The natural resource of usable molybdenite is mainly distributed in countries such as China, USA, Chile, or the like, which is mainly produced from a by-product of a copper mine.
Generally, the copper content of ferromolybdenum for making steel is limited to 0.5% or less. In order to lower the copper content of the molybdenite, degradation in recovery rate of molybdenum is inevitable because copper ore is also sulfide form. Meanwhile, molybdenite concentrate with high copper content is also produced and sold in some mines. Therefore, in order to use the molybdenite with high copper content, the copper content is lowered by using an acid leaching process after oxidation or by being mixed with ores with low copper content.
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