Patent US3725527A successfully refreshed from Google Patents.
US3725527A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovering pure aqueous solution of ferric chloride and aqueous solution of metal chlorides free of ferric chloride from ferrous metal material
Assignee: Kanto Denka Kogyo Co Ltd
•
Filing: 1971-10-21
•
Granted: 1973-04-03
•
Expires: 1991-10-21
Abstract
Abstract Iron material consisting of iron metal having associated minor amounts of other noniron metals is reacted with hydrochloric acid solution to form an aqueous solution of metal chlorides, which solution is oxidized with oxygen or chlorine, or mixtures thereof and then the oxidized solution containing ferric chloride is subjected to liquid-liquid contact with an alkyl, aryl or aralkyl ketone or ether having four to 10 carbon atoms so that the ferric chloride is transferred to the organic extract phase, leaving the noniron metal chlorides in the aqueous raffinate, and backextracting the organic extract with an aqueous medium and separating the thus obtained aqueous extract solution of ferric chloride.
Inventors
- 👤 T Yamamura
- 👤 Y Omote
- 👤 S Sato
- 👤 T Hiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:53
CPC Classifications
C; C01; C01G; C01G23/00; C01G23/001; C01G49/00; C01G49/0009; C22; C22B; C22B3/00; C22B3/20; C22B3/26; C22B3/306; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
35 words
contacting the initial acid solution with an oxidizing agent selected from the group consisting of molecular oxygen and chlorine and mixtures thereof to oxidize ferrous iron present in said initial acid solution into ferric iron;
Claim 2
Dependent Claim
13 words
The process of claim 1 in which the iron material is scrap iron.
Claim 3
Dependent Claim
28 words
The process of claim 1 in which the step (1) consists of a steel pickling step and the solution produced in said step is a steel pickling solution.
Claim 4
Dependent Claim
63 words
maintaining (a) the chlorine ion concentration of said initial acid solution at least fourfold equivalent to the concentration of ferric ion, (b) the amount of said hydrochloric acid at least 1 molar equivalent to the amount of the ferric chloride present in said initial acid solution and (c) the ferric chloride concentration in said initial acid solution at least more than 100 g./l.;
Claim 5
Dependent Claim
82 words
contacting the thus obtained initial acid solution with at least a twofold stoichiometric molar equivalent, based on the amount of the ferric chloride present in said initial acid solution, of at least one organic extractant selected from the group consisting of ketones and ethers having from four to 10 carbon atoms, dissolved in an organic carrier solvent selected from the group consisting of hydrocarbons and chlorinated hydrocarbons, thus to extract ferric chloride values from said initial acid solution in the organic phase;
Claim 6
Dependent Claim
21 words
separating the resulting iron-containing organic extract from the aqueous solution of metal chlorides substantially free from ferric chloride as the raffinate;
Claim 7
Dependent Claim
20 words
contacting said organic extract with an aqueous medium to back extract the ferric chloride values from said organic extract; and
Claim 8
Dependent Claim
16 words
separating the thus obtained aqueous extract solution of ferric chloride from the substantially iron-free organic solvent.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |