US4115106A
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Method for producing metallic oxide compounds
Assignee: National Standard Co
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Filing: 1976-10-20
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Granted: 1978-09-19
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Expires: 1996-10-20
Abstract
Abstract A method for producing metallic oxide compounds having a spinel type structure by reacting the beta form of hydrated iron oxide with a salt of an effective metallic cation.
Inventors
- 👤 Cloyd A. Snavely
- 👤 John A. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:59
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2666; C01; C01B; C01B13/00; C01B13/14; C01G; C01G49/00; C01G49/02; C01G49/08; C04B35/2608; C04B35/2625; C04B35/265; C04B35/2658; C01P; C01P2002/00; C01P2002/30; C01P2002/32; C01P2006/00; C01P2006/12; C01P2006/60; C01P2006/80
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
59 words
A method for producing fine metallic oxides of spinel-type structure comprising the step of reacting beta FeOOH with an aqueous solution of a salt of a substitution-effective metallic cation to yield a ferrite product exhibiting a spinel crystal habitat, wherein the conversion of the beta FeOOH to the ferrite product is substantially complete within less than approximately 40 minutes.
Claim 2
Independent Claim
59 words
A method for producing fine metallic oxides of spinel-type structure comprising the step of reacting beta FeOOH with an aqueous solution of a salt of a substitution-effective metallic cation to yield a ferrite product exhibiting a spinel crystal habitat, wherein the conversion of the beta FeOOH to the ferrite product is substantially complete within less than approximately 40 minutes.
Claim 3
Dependent Claim
11 words
The method of claim 1, wherein said cation is divalent iron.
Claim 4
Dependent Claim
22 words
The method of claim 2, wherein the salt is selected from the group consisting of chlorides, sulfates, and acetates of divalent iron.
Claim 5
Dependent Claim
12 words
The method of claim 3, wherein said salt is FeCl 2 .
Claim 6
Dependent Claim
23 words
The method of claim 1, wherein the reaction is conducted within the temperature range of from about 75° F. to about 210° F.
Claim 7
Dependent Claim
21 words
The method of claim 5, wherein said reaction is conducted within a pH range of from about 4.3 to about 14.
Claim 8
Dependent Claim
23 words
The method of claim 3, wherein the total iron concentration is within the range of from about 7 gm/l to about 210 g/l.
Claim 9
Independent Claim
115 words
A method for producing fine metallic oxides of spinel-type structure and having the form M.sub.x.sup.+2 Fe.sub.1-x.sup.+2 N.sub.y.sup.+3 Fe.sub.2-y.sup.+3 O.sub.4 comprising the step of reacting beta FeOOH with an aqueous solution of salts of metallic cations M and N, wherein: M is a divalent cation selected from the group consisting of Co, Mg, Mn, Ni, Nz and mixtures thereof; N is a trivalent cation selected from the group consisting of Co, Cr, Mn, Ni, V and mixtures thereof; and the sum of x + y < 0; to yield a fine metallic oxide having a spinel-type structure, wherein the conversion of the beta FeOOH to the oxide is substantially complete within less than approximately 40 minutes.
Claim 10
Independent Claim
115 words
A method for producing fine metallic oxides of spinel-type structure and having the form M.sub.x.sup.+2 Fe.sub.1-x.sup.+2 N.sub.y.sup.+3 Fe.sub.2-y.sup.+3 O.sub.4 comprising the step of reacting beta FeOOH with an aqueous solution of salts of metallic cations M and N, wherein: M is a divalent cation selected from the group consisting of Co, Mg, Mn, Ni, Nz and mixtures thereof; N is a trivalent cation selected from the group consisting of Co, Cr, Mn, Ni, V and mixtures thereof; and the sum of x + y < 0; to yield a fine metallic oxide having a spinel-type structure, wherein the conversion of the beta FeOOH to the oxide is substantially complete within less than approximately 40 minutes.
Claim 11
Dependent Claim
25 words
The method of claim 8, wherein said aqueous solution of salts includes a salt of divalent iron in addition to said cations M and N.
Claim 12
Dependent Claim
26 words
The method of claim 9, wherein said salts are selected from the group consisting of chlorides, sulfates and acetates and mixtures thereof of said metallic cations.
Claim 13
Dependent Claim
25 words
The method of claim 9, wherein M is selected from the group consisting of Co, Mn, Ni, Zn and mixtures thereof; and N is Cr.
Claim 14
Independent Claim
158 words
The method for producing a fine metallic oxide of spinel-type structure and having the form M.sub.x.sup.+2 Fe.sub.1-x.sup.+2 N.sub.y.sup.+3 Fe.sub.2-y.sup.+3 O.sub.4 comprising the steps of: (a) treating iron-bearing materials with FeCl 3 whereby FeCl 2 is produced as a by-product; (b) oxidizing said FeCl 2 to yield particles of beta FeOOH and regenerate FeCl 3 ; (c) reacting said beta FeOOH with an aqueous solution comprising salts of effective metallic cations M and N and divalent iron to yield said oxide, wherein the conversion of the beta FeOOH to the oxide is substantially complete within less than approximately forty minutes; and (d) recycling the FeCl 3 of step (b) to step (a); wherein: M is a divalent cation selected from the group of Co, Mg, Mn, Ni, Zn and mixtures thereof; N is a trivalent cation selected from the group consisting of Co, Cr, Mn, Ni, V and mixtures thereof; and the sum of x + y > 0.
Claim 15
Independent Claim
158 words
The method for producing a fine metallic oxide of spinel-type structure and having the form M.sub.x.sup.+2 Fe.sub.1-x.sup.+2 N.sub.y.sup.+3 Fe.sub.2-y.sup.+3 O.sub.4 comprising the steps of: (a) treating iron-bearing materials with FeCl 3 whereby FeCl 2 is produced as a by-product; (b) oxidizing said FeCl 2 to yield particles of beta FeOOH and regenerate FeCl 3 ; (c) reacting said beta FeOOH with an aqueous solution comprising salts of effective metallic cations M and N and divalent iron to yield said oxide, wherein the conversion of the beta FeOOH to the oxide is substantially complete within less than approximately forty minutes; and (d) recycling the FeCl 3 of step (b) to step (a); wherein: M is a divalent cation selected from the group of Co, Mg, Mn, Ni, Zn and mixtures thereof; N is a trivalent cation selected from the group consisting of Co, Cr, Mn, Ni, V and mixtures thereof; and the sum of x + y > 0.
Claim 16
Dependent Claim
25 words
The method of claim 12, wherein M is selected from the group consisting of Co, Mn, Ni, Zn and mixtures thereof; and N is Cr.
Claim 17
Dependent Claim
28 words
The method of claim 13, wherein said salts are selected from the group consisting of chlorides, sulfates, and acetates and mixtures thereof of M, N and divalent iron.
Claim 18
Dependent Claim
21 words
The method for producing a ferrous alloy comprising the step of reducing the oxide produced by the method of claim 14.
Claim 19
Dependent Claim
9 words
The homogeneous, non-hydrated fine oxide product of claim 13.
Claim 20
Dependent Claim
16 words
The ferrous alloy of claim 15, wherein the constituents M, N and Fe are homogenously dispersed.
Claim 21
Dependent Claim
8 words
The non-hydrated, fine oxide produced by claim 1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-18 | 1982-03-20 | 1982-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-18 | 1986-03-20 | 1986-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-18 | 1990-03-20 | 1990-09-19 | $7700.00 | Window Closed / Lapsed |