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| Number | Title | Issue Date |
| 7294168 | Method for purifying the solution in the hydrometallurgical processing of copper The invention relates to the removal of bivalent copper from copper chloride solution in connection with the hydrometallurgical production of copper. In the copper production process, a copper-bearing raw material is leached with a chloride-bearing solution. The cop... | 11/13/2007 |
| 7097747 | Continuous process electrorefiner A new device is provided for the electrorefining of uranium in spent metallic nuclear fuels by the separation of unreacted zirconium, noble metal fission products, transuranic elements, and uranium from spent fuel rods. The process comprises an electrorefiner cell. ... | 08/29/2006 |
| 7041820 | Process for producing (dioxolenon-4-yl)methyl ester derivative There is provided a method by which various compounds (1) having a carboxyl group in the molecule have the carboxyl group converted to a (dioxolenon-4-yl)methyl ester at low cost, in a simple way and at high yield. The process for producing compounds of formu... | 05/09/2006 |
| 6929677 | Method for leaching copper concentrate This invention relates to a method where sulfidic iron-bearing copper concentrate is leached on the countercurrent principle, in a chloride environment. The leaching takes place with the aid of bivalent copper and an oxygen-bearing gas as a multi-stage continuous pr... | 08/16/2005 |
| 6685821 | Method and system for producing high-pressure hydrogen Disclosed are methods and systems for generating hydrogen gas at pressures high enough to fill a hydrogen storage cylinder for stationary and transportation applications. The hydrogen output of an electrochemical hydrogen gas generating device is integrat... | 02/03/2004 |
| 6685819 | System and method for removing a solution phase metal from process liquor A galvanic cell system (50) in fluid communication with a dewatering system (40) of an inhibited oxidation scrubber (20) removes an oxidation catalyst, i.e., solution phase iron (98), from the process liquor (42) produced by the dewatering system (40) and... | 02/03/2004 |
| 6569559 | Method for transferring thermal energy and electrical current in thin-film electrochemical cells An improved electrochemical generator is disclosed. The electrochemical generator includes a thin-film electrochemical cell which is maintained in a state of compression through use of an internal or an external pressure apparatus. A thermal conductor, wh... | 05/27/2003 |
| 6379525 | Enhanced electrolyzer An improved electrolyzer is disclosed herein. The electrolyzer includes a housing having an inlet and an outlet at a common end. Within the housing are disposed electrode elements, and a passageway that connects the inlet to the outlet. In accordance with... | 04/30/2002 |
| 6165341 | Catalytic film, methods of making the catalytic films, and electrosynthesis of compounds using the catalytic film In one embodiment, the present invention relates to a method of making a catalytic film comprising: applying an electric current to an electrochemical cell comprising an anode, a cathode and a solution comprising a film forming compound and a nitrate ion ... | 12/26/2000 |
| 5529683 | Method for preventing degradation of membranes used in electrolytic ozone production systems during system shutdown Prevention of degradation of ion exchange membranes and/or system hardware in electrolytic systems, during system shutdown, is effected by applying a reverse potential to the electrolytic system during shutdown of operation.... | 06/25/1996 |
| 5487819 | Production of metals from minerals A process for producing one or more metals from a mineral feedstock (12) is defined. The mineral is fed to a leaching apparatus (10) wherein it is contacted with electrolyte (14). The leaching apparatus has zones of decreasing oxidation potential (17, 18,... | 01/30/1996 |
| 5181996 | Electrochemical generation of dinitrogen pentoxide in nitric acid A two-stage method of producing N2 O5 in nitric acid from N2 O4 in nitric acid consists of a first production stage in which the anodic oxidation of N2 O4 in nitric acid and cathodic reduction ... | 01/26/1993 |
| 5106467 | Alkaline leaching of galvanized steel scrap Caustic dezincing galvanized steel scrap. A dezincing plant includes a plurality of tanks interconnected in series with steel scrap sequentially being moved through each of the tanks. The tanks contain a caustic leaching solution including an oxidant with... | 04/21/1992 |
| 4963235 | Process for treating electrolytic cell products An electrolytic cell of the type to which electrolyte is continuously charged and from which a product or products of electrolysis is or are continuously removed, the electrolytic cell being associated in close proximity with an item or items of apparatus... | 10/16/1990 |
| 4919772 | Electrolytic cell/process for the reduction of titanium/iron solutions An electrolytic cell for the reduction of solutions containing both titanium and iron ions, e.g., solutions emanating from the sulfuric acidulation of ilmenite, has a cationic exchange membrane separating the anode and cathode compartments thereof; the so... | 04/24/1990 |
| 4917781 | Process for preparing quaternary ammonium hydroxides A process is described for preparing quaternary ammonium hydroxides of improved purity. In one embodiment, the present invention relates to a process of preparing quaternary ammonium hydroxides from the corresponding quaternary ammonium salts in an electr... | 04/17/1990 |
| 4904358 | Gold and silver recovery processes by electrolytic generation of active bromine The invention comprises leaching of ore or other materials containing gold and/or silver with an electrolyzed sodium bromide solution. A quantity of electric current is passed through a volume of 5% to 50% by weight sodium bromide solution to generate a q... | 02/27/1990 |
| 4789442 | Method for producing adiponitrile A method for producing adiponitrile through the electrohydrodimerization of acrylonitrile by electrolyzing an emulsion comprised of an aqueous phase and an organic phase in at least one undivided cell having a cathode of lead or a lead alloy, in which an ... | 12/06/1988 |
| 4693794 | Process for manufacturing hydrogen peroxide electrolytically The invention is a method for operating a cell or plurality of cells for manufacturing hydrogen peroxide by reducing oxygen contained in the air. The method comprises directing air free from carbon dioxide over a cathode surface comprising an exterior sur... | 09/15/1987 |
| 4632738 | Hydrometallurgical copper process A novel hydrometallurgical process for the recovery of copper, and optionally iron, from sulfide copper concentrates containing common copper sulfides such as chalcopyrite, bornite and chalcocite using electrowinning cells wherein the anolyte and the cath... | 12/30/1986 |
| 4626326 | Electrolytic process for manufacturing pure potassium peroxydiphosphate The invention provides a process to manufacture fluoride-free potassium peroxydiphosphate on a commercial scale. The process comprises electrolyzing an alkaline anolyte containing potassium, phosphate, nitrate and hydroxyl ions at a platinum or noble meta... | 12/02/1986 |
| 4589966 | Membrane cell jumper switch An electrolytic cell jumper switch system is disclosed which eliminates all damaging reverse currents without utilizing any additional rectifiers, power supply or auxiliary power or current sources by loading the electrical current flow through resistor m... | 05/20/1986 |
| 4557908 | Process for the treatment of a purge solution particularly intended for a process for the extraction of zinc by electrolysis The invention relates to the treatment of purge solutions formed in the process of the extraction of zinc by electrolysis. According to the invention, the purge solution, which consists of a part of the purified solution rich in zinc sulfate, is subjected to ... | 12/10/1985 |
| 4539083 | Method for preventing degradation in activity of a low hydrogen overvoltage cathode Disclosed is a method for preventing a low hydrogen overvoltage cathode from degradation in activity characterized by adding a reducing agent to a cathode compartment of an electrolytic cell which electrolysis an aqueous alkali metal halide solution. Acco... | 09/03/1985 |
| 4537662 | Method of electrically shorting an electrolytic cell A method for electrically shorting a high current, low voltage, single, chloralkali, membrane, electrolytic cell of a certain configuration to permit first its removal from a system, comprised of a plurality of electrically series connected cells, for mai... | 08/27/1985 |
| 4462885 | Conductor arrangement of electrolytic cells for producing aluminum A plurality of rectangular electrolytic cells are disposed in at least two rows of a side-by-side arrangement of cells. A first set of cathode bus bars extends along the outside of the short end of the cell facing the other row of cells. This set of bus b... | 07/31/1984 |
| 4431492 | Aluminum electrolytic cell arrays and method of supplying electric power to the same In an array of rectangular aluminum electrolytic cells, each cell is provided with a plurality of anode electrodes, a plurality of current collecting cathode bars parallel with shorter side walls and located at a bottom of the cell and a plurality of side... | 02/14/1984 |
| 4421614 | Method of bypassing electric current of electrolytic cells The method for bypassing the electric current of at least one cell of an electrolytic apparatus includes a series combination of a resistor and a switch connected in parallel to the terminals of the cell to be repaired or replaced. In another embodiment a... | 12/20/1983 |
| 4416744 | Process of electrolytically producing oxyacids of chlorine This invention relates to a process of producing oxyacids of chlorine or salts of such acids by an electrolysis of salt solutions which are contaminated with calcium and/or magnesium or of sea water. In such processes, deposits or crusts are formed on the... | 11/22/1983 |
| 4397735 | Bipolar electrolyzer process Discloses a method of operating a bipolar electrolyzer having a plurality of electrolytic cells hydraulically in parallel where the flow rate of electrolyte and effluent provides circulation, mixing, and avoids pressure transients.... | 08/09/1983 |
| 4391693 | Chlorine cell design for electrolyte series flow Chlor-alkali electrolytic membrane cells are provided with means for flowing catholyte from cell-to-cell sequentially, and means for flowing anolyte from cell-to-cell sequentially.... | 07/05/1983 |
| 4377445 | Shunt current elimination for series connected cells Electrochemical systems having a plurality of cells which are hydraulically and electrically connected in series develop shunt currents in the electrolyte of adjacent cells. The shunt currents are reduced or eliminated by the placing of an electrical bypa... | 03/22/1983 |
| 4345980 | Electrowinning of zinc In the process for electrowinning of zinc from acid zinc sulfate electrolyte, electrolyte is recirculated to the cells and a portion of the electrolyte is returned to the leaching operation of zinc-bearing material. By only returning electrolyte that over... | 08/24/1982 |
| 4341602 | Extraction of uranium using electrolytic oxidization and reduction in bath compartments of a single cell The invention relates to a process for the recovery and the concentration of uranium (VI) contained in an organic phase. The organic phase is treated continuously in a contact zone with an aqueous solution containing an oxidizing-reducing agent in the red... | 07/27/1982 |
| 4312724 | Method for the recovery of lead from materials containing lead sulfide Method for the recovery of lead from lead sulfide containing materials such as ores and concentrates wherein the materials are initially leached in a leaching vessel containing a chloride solution and iron (III) chloride as an oxidation agent to form an i... | 01/26/1982 |
| 4305793 | Method of concentrating alkali metal hydroxide in hybrid cells having cation selective membranes Alkali metal hydroxide solutions are purified and concentrated by electrolysis of such solutions in the anode compartment of a hybrid cell comprising an anode compartment and a cathode compartment separated by a cation permeable diffusion barrier. To enab... | 12/15/1981 |
| 4288303 | Electrochemical processing system An electrochemical processing system is provided. The system comprises an electrochemical cell having a first compartment adapted to contain a first solution, a first counter electrode and a first reference electrode in contact with the first solution, a ... | 09/08/1981 |
| 4285786 | Apparatus and method of monitoring temperature in a multi-cell electrolyzer An apparatus and method of monitoring temperature in a multicell electrolyzer used to produce a gaseous product from a liquid phase electrolyte by placing a single temperature sensing means in the common product collection means is disclosed.... | 08/25/1981 |
| 4279712 | Method for electrolyzing hydrochloric acid In a method for electrolyzing hydrochloric acid in an electrolysis apparatus, the improvement which comprises the electrolysis apparatus comprising at least two electrolysis cells, each electrolysis cell having at least one anode, at least one cathode and... | 07/21/1981 |
| 4277317 | Shunt current elimination and device employing tunneled protective current The present invention is directed to a method of minimizing shunt currents in electrochemical devices which have a plurality of cells connected, at least in part, in series and which have a common electrolyte which is fed to at least two of the cells as a... | 07/07/1981 |
