Name:  ferroferric oxide

Molecular formula:  Fe₃O₄

Molecular weight:   231.54

Physical and Chemical property: density:5.18g/cm^3,melting point:1867.5K(1594.5℃),magnetism, water-fast, acid soluble, good electroconductivity 

Specification:  722,730

Appearance:  black crystalloid 

2.  Usage:  (1) raw materials of tapes and telecommunications' equipment,

           (2) making primers and paint,

           (3) abrasive and pigment and polishes,

           (4) to prevent or slow down steel corrosion

3.  Production technology:    

     (1) The wire in oxygen burning;

    (2) The wire in air burning under 500 degree;

    (3) 3Fe + 4H₂O = Fe₃O₄ + 4H₂(high temperature);

    (4) FeCl₂+FeCl₃+NH₃→Fe₃O₄

 

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