US3847765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the treatment of cyanide-containing wastes
Assignee: Mitsubishi Chemical Corp
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Filing: 1973-12-04
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Granted: 1974-11-12
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Expires: 1993-12-04
Abstract
Abstract This invention relates to a method for the treatment of cyanidecontaining wastes, which method comprises passing a part of cyanide-containing waste from a cyanide-containing waste storage tank in series through a cathode compartment composed of a cathode and cation exchange membrane and an anode compartment composed of an anode and anion exchange membrane and then recirculating to the cyanide-containing waste storage tank, simultaneously passing the other part of cyanide-containing waste in parallel through a plurality of concentration compartments partitioned by a plurality of anion exchange membranes and cation exchange membranes arranged alternately and then recirculating to the cyanide-containing waste storage tank, and simultaneously passing a solution of an alkali metal chloride or alkaline earth metal chloride from an alkali metal chloride or alkaline earth metal chloride solution storage tank in parallel through a plurality of dilution compartments partitioned by a plurality of anion exchange membranes and cation exchange membranes arranged alternately and then recirculating to the alkali metal chloride or alkaline earth metal chloride solution storage tank.
Inventors
- 👤 T Uno
- 👤 K Uosaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:44
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/42; B01D61/44; B01J; B01J47/00; B01J47/12; C; C02; C02F; C02F1/00; C02F1/46; C02F1/461; C02F1/467; C02F1/4672; C02F1/4674; C02F1/469; C02F1/4693; C02F2101/00; C02F2101/10; C02F2101/16; C02F2101/18; C02F2201/00; C02F2201/46; C02F2201/461; C02F2201/46105; C02F2201/46115; C02F2201/4618; C02F2201/46185
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
162 words
A METHOD FOR THE TREATMENT OF CYANIDE-CONTAINING WASTES, WHICH COMPRISES PASSING A PART OF CYANIDE-CONTAINING WASTE FROM A CYANIDE-CONTAINING WASTE STORAGE TANK IN SERIES THROUGH A CATHODE COMPARTMENT COMPOSED OF A CATHODE AND CATION EXCHANGE MEMBRANE AND AN ANODE COMPARTMENT COMPOSED OF AN ANODE AND ANION EXCHANGE MEMBRANE AND THEN RECIRCULATING TO THE CYANIDE-CONTAINING WASTE STORAGE TANK, SIMULTANEOUSLY PASSING THE OTHER PART OF CYANIDE-CONTAINING WASTE IN PARALLEL THROUGH A PLURALITY OF CONCENTRATION COMPARTMENTS PARTIONED BY A PLURALITY OF ANION EXCHANGE MEMBRANES AND CATION EXCHANGE MEMBRANES ARRANGED ALTERNATELY AND THEN RECIRCULATING TO THE CYANIDE-CONTAINING WASTE STORAGE TANK, AND SIMULTANEOUSLY PASSING A SOLUTION OF AN ALKALI METAL CHLORIDE OR ALKALINE EARTH METAL CHLORIDE FROM AN ALKALI METAL CHLORIDE OR ALKALINE EARTH METAL CHLORIDE SOLUTION STORAGE TANK IN PARALLEL THROUGH A PLURALITY OF DILUTION COMPARTMENTS PARTITIONED BY A PLURALITY OF ANION EXCHANGE MEMBRANES AND CATION EXCHANGE MEMBRANES ARRANGED ALTERNATELY AND THEN RECIRCULATING TO THE ALKALI METAL CHLORIDE OR ALKALINE EARTH METAL CHLORIDE SOLUTION STORAGE TANK.
Claim 2
Independent Claim
162 words
A METHOD FOR THE TREATMENT OF CYANIDE-CONTAINING WASTES, WHICH COMPRISES PASSING A PART OF CYANIDE-CONTAINING WASTE FROM A CYANIDE-CONTAINING WASTE STORAGE TANK IN SERIES THROUGH A CATHODE COMPARTMENT COMPOSED OF A CATHODE AND CATION EXCHANGE MEMBRANE AND AN ANODE COMPARTMENT COMPOSED OF AN ANODE AND ANION EXCHANGE MEMBRANE AND THEN RECIRCULATING TO THE CYANIDE-CONTAINING WASTE STORAGE TANK, SIMULTANEOUSLY PASSING THE OTHER PART OF CYANIDE-CONTAINING WASTE IN PARALLEL THROUGH A PLURALITY OF CONCENTRATION COMPARTMENTS PARTIONED BY A PLURALITY OF ANION EXCHANGE MEMBRANES AND CATION EXCHANGE MEMBRANES ARRANGED ALTERNATELY AND THEN RECIRCULATING TO THE CYANIDE-CONTAINING WASTE STORAGE TANK, AND SIMULTANEOUSLY PASSING A SOLUTION OF AN ALKALI METAL CHLORIDE OR ALKALINE EARTH METAL CHLORIDE FROM AN ALKALI METAL CHLORIDE OR ALKALINE EARTH METAL CHLORIDE SOLUTION STORAGE TANK IN PARALLEL THROUGH A PLURALITY OF DILUTION COMPARTMENTS PARTITIONED BY A PLURALITY OF ANION EXCHANGE MEMBRANES AND CATION EXCHANGE MEMBRANES ARRANGED ALTERNATELY AND THEN RECIRCULATING TO THE ALKALI METAL CHLORIDE OR ALKALINE EARTH METAL CHLORIDE SOLUTION STORAGE TANK.
Claim 3
Independent Claim
184 words
A method for the treatment of cyanide-containing wastes, which comprises passing a part of cyanide-containing waste from a cyanidE-containing waste storage tank in series through a cathode compartment composed of a cathode and cation exchange membrane and an anode compartment composed of an anode and anion exchange membrane, said cathode compartment and anode compartment being situated in one electrodialysis cell, and then recirculating to the cyanide-containing waste storage tank, simultaneously passing the other part of cyanide-containing waste in parallel through a plurality of concentration compartments partitioned by a plurality of anion exchange membranes and cation exchange membranes arranged alternately between said cathode and anode and then recirculating to the cyanide-containing waste storage tank, and simultaneously passing a solution of an alkali metal chloride or alkaline earth metal chloride from an alkali metal chloride or alkaline earth metal chloride solution storage tank in parallel through a plurality of dilution compartments partitioned by a plurality of anion exchange membranes and cation exchange membranes arranged alternately between said cathode and anode and then recirculating to the alkali metal chloride or alkaline earth metal chloride solution storage tank.
Claim 4
Independent Claim
184 words
A method for the treatment of cyanide-containing wastes, which comprises passing a part of cyanide-containing waste from a cyanidE-containing waste storage tank in series through a cathode compartment composed of a cathode and cation exchange membrane and an anode compartment composed of an anode and anion exchange membrane, said cathode compartment and anode compartment being situated in one electrodialysis cell, and then recirculating to the cyanide-containing waste storage tank, simultaneously passing the other part of cyanide-containing waste in parallel through a plurality of concentration compartments partitioned by a plurality of anion exchange membranes and cation exchange membranes arranged alternately between said cathode and anode and then recirculating to the cyanide-containing waste storage tank, and simultaneously passing a solution of an alkali metal chloride or alkaline earth metal chloride from an alkali metal chloride or alkaline earth metal chloride solution storage tank in parallel through a plurality of dilution compartments partitioned by a plurality of anion exchange membranes and cation exchange membranes arranged alternately between said cathode and anode and then recirculating to the alkali metal chloride or alkaline earth metal chloride solution storage tank.
Claim 5
Independent Claim
212 words
A method for the treatment of cyanide-containing wastes, which comprises passing a part of cyanide-containing waste from a cyanide-containing waste storage tank in series through a cathode compartment of a first electrodialysis unit and an anode compartment of a second electrodialysis unit and then recirculating to the cyanide-containing waste storage tank, simultaneously passing the other part of cyanide-containing waste in parallel through concentration compartments of the first electrodialysis unit and then in parallel through concentration compartments of the second electrodalysis unit and then recirculating to the cyanide-containing waste storage tank, and simultaneously passing a solution of an alkali metal chloride or alkaline earth metal chloride from an alkali metal chloride or alkaline earth metal chloride solution storage tank in parallel through dilution compartments of the first electrodialysis unit and then in parallel through dilution compartments of the second electrodialysis unit and then recirculating to the alkali metal chloride or alkaline earth metal chloride solution storage tank, each of said electrodialysis units having a cathode compartment composed of a cathode and cation exchange membrane, anode compartment composed of an anode and anion exchange membrane, and dilution compartments and concentration compartments arranged alternately between the cathode compartment and anode compartment and partitioned alternately by a plurality of anion exchange membranes and cation exchange membranes.
Claim 6
Independent Claim
212 words
A method for the treatment of cyanide-containing wastes, which comprises passing a part of cyanide-containing waste from a cyanide-containing waste storage tank in series through a cathode compartment of a first electrodialysis unit and an anode compartment of a second electrodialysis unit and then recirculating to the cyanide-containing waste storage tank, simultaneously passing the other part of cyanide-containing waste in parallel through concentration compartments of the first electrodialysis unit and then in parallel through concentration compartments of the second electrodalysis unit and then recirculating to the cyanide-containing waste storage tank, and simultaneously passing a solution of an alkali metal chloride or alkaline earth metal chloride from an alkali metal chloride or alkaline earth metal chloride solution storage tank in parallel through dilution compartments of the first electrodialysis unit and then in parallel through dilution compartments of the second electrodialysis unit and then recirculating to the alkali metal chloride or alkaline earth metal chloride solution storage tank, each of said electrodialysis units having a cathode compartment composed of a cathode and cation exchange membrane, anode compartment composed of an anode and anion exchange membrane, and dilution compartments and concentration compartments arranged alternately between the cathode compartment and anode compartment and partitioned alternately by a plurality of anion exchange membranes and cation exchange membranes.
Claim 7
Dependent Claim
29 words
The method of claim 2, wherein the cyanide-containing waste treated in the former operation is reused as the solution of an alkali metal chloride or alkaline earth metal chloride.
Claim 8
Dependent Claim
29 words
The method of claim 3, wherein the cyanide-containing waste treated in the former operation is reused as the solution of an alkali metal chloride or alkaline earth metal chloride.
Claim 9
Dependent Claim
20 words
The method of claim 1, wherein said cyanide-containing waste contains at least one of K4(Fe(CN))6), K2(Ni(CN)4), K2(Cu(CN)3), NaCN and Na4(Fe(CN)6).
Claim 10
Dependent Claim
13 words
The method of claim 1, wherein said alkali metal chloride is sodium chloride.
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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) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |