Manganese

Manganese

Manganese;Colloidal manganese;Cutaval;Manganese-55;JIS-G 1213;Manganese element;Teprosyn Mn;Ele-Max Manganese;MNE 06PB;Amiplus Mn;Basfoliar Manganes;SuperMan;Oligo-Mn;8031-40-1;8075-39-6;17375-02-9;39303-06-5;195161-78-5

7439-96-5

Mn

InChIKey=PWHULOQIROXLJO-UHFFFAOYSA-N

54.94

54.93800

231-869-6

42Z2K6ZL8P

0174

3089

DTXSID2024169

Hard grey metal|Steel grey, lustrous, hard, brittle metal|Alpha is body centered cubic; beta is cubic; delta is body centered cubic.|Gamma or electrolytic manganese is face centered cubic; when stabilized at room temp it is face-centered tetragonal.|For more Color/Form (Complete) data for MANGANESE, ELEMENTAL (6 total), please visit the HSDB record page.

81110011

Inorganic Salts

0

0.00000

Gray-brown to brown-black Powder

7.44 g/cm³

1244 °C

2095 °C

soluble in diluted acids. Insoluble in water.

2-8°C

0 mmHg (approx)

Oral-Rat LD50: 9000 mg/kg

Inflammable in case of open flame, high temperature and oxidant; inflammable hydrogen is generated in case of water and acid

Burns with white light when heated in air.

One stable isotope: 55; exists in 4 allotropic forms: alpha form: body-centered cubic, stable below approx. 710 °C, density (at 20 °C): 7.47; beta form: cubic, stable in the range 710-1079 °C, density (at 20 °C): 7.26; gamma form or electrolytic manganese: face-centered cubic, stable in the range 1079-1143 °C, density (at 1100 °C): 6.37; delta form: body-centered cubic, stable in the range 1143 °C to melting point, density (at 1143 °C): 6.28; gamma manganese when stabilized at room temperature is face-centered tetragonal, density (at 20 °C): 7.21; melting point: 1244 °C; boiling point: 2095 °C|Superficially oxidized on exposure to air. Burns with an intense white light when heated in air. Decomposes in water slowly in the cold, rapidly on heating; pure electrolytic manganese is not attacked by steam. Reacts with dilute mineral acids with evolution of hydrogen and formation of divalent manganous salts. Reacts with aqueous solns of sodium or potassium bicarbonate. When heated in nitrogen above 2000 °C burns to form a nitride. Converted by fluorine into the di- and trifluoride, by chlorine into the dichloride. In form of powder reduces most metallic oxides on heating. On heating, reacts directly with carbon, phosphorous, antimony or arsenic.|When stabilized at room temp, gamma has mp of 1244 °C and bp of 2095 °C|Specific heat 0.115 cal/g/deg C; latent heat of fusion 3.5 kcal/g-atom|COLORS GLASS AN AMETHYST COLOR, & IS RESPONSIBLE FOR COLOR OF TRUE AMETHYST|GAMMA FORM CHANGES TO ALPHA AT ORDINARY TEMP|For more Other Experimental Properties (Complete) data for MANGANESE, ELEMENTAL (12 total), please visit the HSDB record page.

Manganese dust (finely divided) has been known to be pyrophoric. During a fire in an industrial bag filter, a mixture of aluminum and manganese dusts was released and an explosion resulted [Occ. Haz. 28:185-7. 1946-47].

Metals, Less Reactive

Pyrophoric

Manganese dust(finely divided) has been known to be pyrophoric. Powdered manganese ignites in chlorine and burns brilliantly; with fluorine the reaction takes place with incandescence [Mellor 12:185, 344. 1946-47]. Concentrated nitric acid reacts with manganese with incandescence and a feeble explosion [Mellor 12:188. 1946-47]. Manganese or potassium ignites in nitrogen dioxide [Ann. Chim. et Phys.(2) 2:317]. Manganese burns with a brilliant flame when heated in sulfur dioxide vapor [Mellor 12:187. 1946-47]. Contact with conc. hydrogen peroxide causes violent decomposition and/or ignition.

MANGANESE DUST CLOUDS HAVE MINIMAL IGNITION TEMP OF 450 °C. ... THE LIMITING OXYGEN (O2) PERCENTAGE PREVENTING IGNITION OF DUST CLOUD IS 15.

Metal: Combustible Solid

Dust explosion possible if in powder or granular form, mixed with air.

Latent heat of vaporization at boiling point: 4020 J/g