Process for producing alkali metal ferrates utilizing hematite and magnetite
OwnerJohn A. Thompsoninventor
Life of this patent
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Abstract
Alkali metal iron (IV) and iron (VI) ferrates are produced by forming a particulate mixture of reactants including an alkali metal nitrogen oxygen compound and an iron material selected from the group of iron oxide, Fe.sub.2 O.sub.3, Fe.sub.3 O.sub.4 and an iron compound which self-reacts at a temperature less than about 1100.degree. C. to form Fe.sub.2 O.sub.3. The mixture of reactants is subjected to a predetermined elevated temperature for a predetermined time duration sufficient to bring about a reaction between the reactants which produces at least one of iron (IV) and iron (VI) ferrates. The molar ratio of alkali metal nitrogen oxygen compound to the iron material is preferably in the range extending between about 4:1 and about 8:1.
Claims23
A method for producing alkali metal iron (IV) ferrate comprising the steps of:
- (a) forming a particulate mixture of reactants including an alkali metal nitrogen oxygen compound selected from the group consisting of alkali metal nitrate and alkali metal nitrite;
- and an iron material selected from the group consisting of, Fe.sub.2 O.sub.3, Fe.sub.3 O.sub.4, hematite, magnetite, and an iron compound which thermally decomposes at a temperature less than about 1100.degree. C. to form Fe.sub.2 O.sub.3 ;
- and
- (b) subjecting the mixture of reactants to a temperature in the range of about 780.degree. C. to about 1100.degree. C. for a period of time in the range of about 5 minutes to about 2 to 3 hours, in an atmosphere in which there is an absence of free oxygen, sufficient to bring about a reaction to produce alkali metal iron (IV) ferrate.
A method for producing alkali metal iron (VI) ferrate comprising the steps of:
- (a) forming a particulate mixture of reactants including an alkali metal nitrogen oxygen compound selected from the group consisting essentially of alkali metal nitrate and alkali metal nitrite;
- and an iron material selected from the group consisting of Fe.sub.2 O.sub.3, Fe.sub.3 O.sub.4, hematite, magnetite, and an iron compound which thermally decomposes at a temperature less than about 1100.degree. C. to form Fe.sub.2 O.sub.3 ;
- and
- (b) subjecting the mixture of reactants to a temperature in the range of about 780.degree. C. to about 1100.degree. C. for a period of time in the range of about 5 minutes to about 2 hours, in an atmosphere in which there is an absence of free oxygen, sufficient to bring about a reaction to produce alkali metal iron (VI) ferrate.
Dependencies are inferred from the claim text.