Ferromanganese


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ferromanganese

[¦fe·rō′maŋ·gə‚nēs]
(metallurgy)
A ferroalloy containing about 80% manganese and used in steelmaking.

Ferromanganese

 

a ferroalloy, the major components of which are iron and manganese. Carbon ferromanganese, which consists of 75–79 percent Mn and up to 7 percent C (Fe and impurities constituting the remainder), is produced in ore heat-treating furnaces or blast furnaces from manganese concentrates. Medium-carbon ferromanganese, containing 86–89 percent Mn and up to 1.5 percent C, and low-carbon (purified) ferromanganese, containing 86–89 percent Mn and up to 0.5 percent C, are obtained in ore heat-treating furnaces by the silicothermic method from silicomanganese, manganese concentrates, and low-phosphorus manganese slag.

Ferromanganese is used for the deoxidizing and alloying of steel. In addition to ferromanganese, metallic manganese, obtained through electrothermic and electrolytic methods is also produced. Purified, nitrided ferromanganese (approximately 6 percent N) and metallic manganese are obtained by holding the alloy or metal in powder form in a nitrogen atmosphere at a temperature of 900°C.

References in periodicals archive ?
In terms of type, the silicomanganese segment is anticipated to expand at a rapid phase during the forecast period, as it is less costlier than ferromanganese and refined manganese
These are: regulations on polymetallic nodules, approved in 2000; regulations on polymetallic sulphides, approved in 2010; and regulations on cobalt-rich ferromanganese crusts, approved in 2012.
and Hein, J.R.: 1996, Comparison of the partitioning behaviours of yttrium, rare earth elements, and titanium between hydrogenetic marine ferromanganese crusts and seawater.
Steps of sequential chemical extraction SCE step Fraction Extraction solution Operation conditions I Exchangeable Mg[Cl.sub.2] Shake for 4h (1 mol/L, pH = 7) at room temperature II Carbonate- C[H.sub.3]COONa Shake for bound (1 mol/L, pH = 5) 5 h at room temperature III Ferromanganese C[H.sub.3]COOH Shake for 5 oxyhydroxides- (25%, 0.04 mol/L h at 90 [degrees]C bound HON[H.sub.3]Cl) IV Sulfide-bound HN[O.sub.3] (2 mol/L) Shake for 6 h at 90 [degrees]C V Organic matter- HN[O.sub.3] Shake for 2 bound (0.02 mol/L) + h at 90 [degrees]C [H.sub.2][O.sub.2] (30%), Shake for 1 C[H.sub.3]COON[H.sub.4] h at room (3.2 mol/L, temperature 20% HN[O.sub.3]) VI Aluminosilicate- Wet digestion bound Table 5.
It is estimated, however, 780,000 tons of ferromanganese
In 2016, the combined sales of these plants were approximately 160,000 tons of ferromanganese and 110,000 of silicomanganese.
Even when we evaluated serum manganese with respect to lipid status, dyslipidemia-manganese relationship has been studied more in the other direction; for instance, low manganese intake has been associated to a better lipid profile in healthy adults (38) while workers exposed to manganese in ferromanganese industry had increased serum triglycerides (39); studies in animals have reported that manganese supplementation induces hypercholesterolemia and hypertriglyceridemia (6, 10).Taking into account all these works and ours, we consider that it would be interesting to study the interplay between manganese, dyslipidemia and tobacco smoking and its relevance for diseases associated with high manganese levels.
Cave ferromanganese deposits contain some archaea groups, which include mesophilic Crenarchaeota and Euryarchaeota, and this group of archaea has been reported in different studies (31,33).
So far, it has issued 15-year contracts for exploration of polymetallic nodules, polymetallic sulphides and cobalt-rich ferromanganese crusts in the deep seabed to 26 contractors--but few are as far advanced as the Canadian firm.
Manganese induced parkinsonism: An outbreak due to an unrepaired ventilation control system in a ferromanganese smelter.
Ammonia gas is one of the most common sources of nitrogen which can be used in nitriding of ferromanganese in liquid state [4] or in the solid finely divided form [5].
Halliday, "The global variation in the iron isotope composition of marine hydrogenetic ferromanganese deposits: Implications for seawater chemistry?" Earth and Planetary Science Letters, vol.