Alkaline earth metal ferrite and ferric oxide admixture
OwnerLloyd Ballard Mauldin, Jerry Allen Cookinventors
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Abstract
A method is disclosed for the manufacture of particles composed of an intimate admixture of barium or strontium ferrite and ferric oxide from a chloride solution containing barium or strontium ions and ferrous ions by a pyrohydrolysis reaction. The presence of carbon dioxide in the heated atmosphere in which pyrohydrolysis of an admixture of alkaline earth metal chloride and iron chloride is carried out has been discovered to substantially decrease the temperature required for reaction to occur.
Claims20
The method of preparing particles composed of an intimate admixture of alkaline earth metal ferrite and ferric oxide from a chloride solution containing alkaline earth metal ions and iron ions by spraying said chloride solution into a heated atmosphere containing oxygen, water, and at least about 5 weight percent carbon dioxide.
The method of producing particles of intimately admixed alkaline earth metal ferrite and ferric oxide from a chloride solution containing alkaline earth metal ions and iron ions, which comprises:
- (a.) Heating the chloride solution to evaporate water from the solution and form coprecipitated alkaline earth metal chloride and iron chloride;
- (b.) Heating the coprecipitated alkaline earth metal chloride and iron chloride in an atmosphere containing water vapor, oxygen, and at least about 5 weight percent carbon dioxide to a temperature from about 400° C. to about 1000° C. to form hydrogen chloride gas and particles of intimately admixed alkaline earth metal ferrite and ferric oxide.
The method of producing particles of intimately admixed alkaline earth metal ferrite and ferric oxide from a chloride solution containing alkaline earth metal ions and iron ions, which comprises:
- (a.) Heating the chloride solution to evaporate water from the solution and form particles composed of coprecipitated alkaline earth metal chloride and iron chloride;
- (b.) Heating the particles composed of coprecipitated alkaline earth metal chloride and iron chloride in an atmosphere containing water vapor and oxygen to a temperature from about 400° C. to about 800° C. to form hydrogen chloride gas and particles composed of ferric oxide intimately admixed with alkaline earth metal chloride;
- (c.) Heating the particles composed of ferric oxide intimately admixed with alkaline earth metal chloride in an atmosphere containing water vapor and at least about 5 weight percent carbon dioxide to a temperature from about 800° C. to about 1000° C. for a sufficient time to form hydrogen chloride gas and particles of alkaline earth metal ferrite.
Dependencies are inferred from the claim text.