Method producing composite oxides for use as starting materials

Details Method producing composite oxides for use as starting materials Method producing composite oxides for use as starting materials

1990-12-07

1993-03-02

Langel, Wayne

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

252 6262, 252 6264, C01G 4902

Patent

active

051907402

ABSTRACT:
A method for producing an oxide useful as a starting material for making soft ferrites comprised mainly of iron, zinc and at least one metal selected from manganese, magnesium, nickel and copper is described. In the method, while chlorides of metals other than zinc are roasted for oxidation to produce a composite oxide, zinc oxide is added during the roasting. This method ensures addition of zinc oxide at high yield without use of zinc chloride having a high vapor pressure. The resultant oxide for ferrites has desired ratios of metal constituents and contains spinel ferrites which are intermediate products with zinc oxide being uniformly dispersed. The use of the starting oxide leads to omission of a calcination step and a powder mixing step in the production process of ferrites. Ferrites with good quality can be obtained by direct sintering.
An alternative method using zinc chloride instead of zinc oxide is also described which can provide an equivalent oxide for making ferrites.

REFERENCES:
patent: 4336242 (1982-06-01), Schmidberger et al.
patent: 4425250 (1984-01-01), Hibst
patent: 4472369 (1984-09-01), Kambe et al.
patent: 4765920 (1988-08-01), Gattuso et al.
WO88/00925 published Feb. 1988.
"The Importance of Hydrochloric Acid Regeneration, Processes for the Industrial Production of Ferric Oxides and Ferrite Powder," Ferrites Proceedings of the International Conference Sep., Oct. 1980, Japan, pp. 64-67.

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