Method for preparing magnetite magnetic powder

Details Method for preparing magnetite magnetic powder Method for preparing magnetite magnetic powder

1994-12-23

1996-12-31

Bonner, Melissa

Compositions

Magnetic

Iron-oxygen compound containing

423632, C04B 3526

Patent

active

055890970

ABSTRACT:
Ferrous chloride is used as a starting material and roasted in a steam-containing atmosphere for pyrolysis to prepare a magnetite magnetic powder having a saturation magnetization .sigma.s of 82-92 emu/g and a magnetite phase content of at least 90 wt. %. Prior to roasting, the ferrous chloride may be pre-treated by heat treating it at a low temperature in a non-oxidizing atmosphere, cooling it down to a predetermined temperature, and then exposing it to an oxygen-containing atmosphere. A mixture of ferrous chloride and ferric chloride may also be used as the starting material. These methods can produce magnetite magnetic powder having improved magnetic properties through fewer steps in a simple and easy manner.

REFERENCES:
patent: 4436681 (1984-03-01), Barczak et al.
Chamical Abstracts citation 94:177423, Shibayama et al, 1980 no month.
Chemical Abstracts citation 90:189226, JP 54-2993, Oct. 1, 1979.
"Development Studies On Thermochemical Cycles For Hydrogen Production", pp. 8.8-.108, D. Van Valzen, et al. World Hydrogen Energy Conf., vol. 1, No. 1, 1976 no month.
"Preparation Of Magnetite Magnetic Powder By Thermal Decomposition", Autumn, 1994, no month Yoshito Nihira, et al.

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