RussianPatents.com
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Wettable cathode material for aluminium electrolysis cell. RU patent 2412283. |
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FIELD: chemistry. SUBSTANCE: wettable cathode material for an aluminium electrolysis cell consists of titanium diboride wettable by liquid aluminium and binder - saturated solution of a hexa-hydrate of aluminium trichloride with ratio of titanium diboride to binder between 1:50 and 1:15. EFFECT: production of aluminium-wettable electroconductive, strong and easily producible cathode material. 2 tbl
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Cathodes for aluminium electrolytic cells with groove of nonplanar configuration / 2403324 Cathode for an aluminium electrolytic cell consists of cathode blocks and lead rods attached thereto with the grooves receiving the lead rods in these cathodes having the greater depth in the centre than at both peripheries of the cathode block. Besides the thickness of the lead rod is greater in the centre than at both peripheries of the cathode block. Also there are described methods for making a cathode and electrolytic cell with said cathode. |
Cathode assembly of aluminium electrolysis cell / 2401887 Cathode assembly of an aluminium electrolysis cell has a bottom made from bottom blocks with cathode rods. The cathode rods, which have a rectangular cross-section, have an electrodeposited copper coating which has a varying cross-section on the length, with increase in thickness of the coating from the periphery to the opposite end and coating of the blind end. |
Procedure for protection of cathode unit of aluminium electrolyser / 2401886 Procedure for protection of cathode unit of aluminium electrolyser consists in application of coating on carbon sole blocks. Upper surface of carbon sole blocks is preliminary impregnated with water solutions of pure salts of aluminium or with mixture of aluminium salts with sodium salts and conditioned during 20-30 minutes. Also graphite blocks impregnation and drying is alternated 2-4 times to increase depth of impregnation and to reduce cross section of pores. |
Method of protecting cathode assembly of aluminium electrolysis cell / 2401885 Method involves deposition of a coating on coal-graphite blocks, where the said coating is molten silicon which is deposited through plasma sputtering at the bottom and sides of the coal-graphite blocks and has thickness of not more than 2 mm. |
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Current feed bus / 2394116 Current feed bus comprises ends or sections, one or several ends or sections, extending beyond electrode body in operation, and one or several ends or sections sitting in operation inside electrode body. Said ends or sections represent one or several, in fact, horizontal conical elements. Maximum horizontal cross section of each of the latter is located inside electrode body so that, after displacement of said elements along axis in one or several conical orifices in electrode body, said elements are inserted and held therein. Note here that said conical elements inserted into electrode body are made from steel or represent a copper core coated with steel and have one or several, in fact, horizontal cylindrical or conical slots with maximum horizontal cross section of each of the latter. Note also that, on moving copper guides in, aforesaid elements get connected with said guides and can be disconnected therefrom. Proposed invention covers also electrode body. |
Cathodes for aluminium electrolytic cells with foam graphite lining / 2389826 Cathode comprises coal or graphite cathode block with slot for current-collecting rod fixed to this block, besides slot of cathode that contains current-collecting rod, is partially or fully lined with foam graphite lining. Method is also described for manufacturing of such cathode, as well as aluminium electrolytic cell equipped with such cathode. |
Casing method of cathode device of electrolytic cell for receiving of aluminium / 2385972 Casing method includes bitstone of heat-insulating layer into casing of cathode device, erection of fireproof layer, installation of bottom and side blocks with following sealing of joints between them by cold-tamped bottom mass. During charging of heat-insulating layer it is used nongraphitic carbon or powder of silica-alumina or aluminous composition pre-mixed with nongraphitic carbon. Formation of fireproof layer is implemented by charging of powder of silica-alumina composition and its sealing by vibration compaction up to receiving of apparent porosity of fireproof layer not more than 17%. It is used powder of silica-alumina or aluminous composition from 20 up to 80% of total mass of heat-insulating layer and not less than for 70% consisting of particles of dimensions less than 0.040 mm and with thermal-conductivity coefficient not more than 0.18 Wt/mK. In the capacity of nongraphitic carbon there are used smoke black, brown coal char. In the capacity of aluminous composition it can be used argil, 60-70% of which consists of particles of dimensions less than 0.1 mm. In the capacity of aluminous composition it can be used chamotte powder with content of aluminium oxide 27-34%. |
Method of graphite production / 2385290 Method consists in charging items out carbon materials, in graphitizing to their acquiring specified degree of graphitising, in cooling in furnace and in graphite unloading. Items charging is carried out continuously or periodically in form of fractions (-15+4) mm. Graphitising is performed in electric arc at temperature 2600-3000°C. Duration from charging to unloading of graphite is not more, than 60 hours. Ashes of burned anodes or reversed burned anodes, or reversed burned electrodes for metallurgic furnaces, or mixture of ashes of burned anodes and reversed burned anodes at ratio 1:1-2:1, or mixture of ashes of burned anodes and reversed burned electrodes for metallurgic furnaces at ratio 1:1-2:1 are used as items out of carbon materials. |
Cathode assembly of aluminium electrolytic cell / 2381301 Invention relates to nonferrous metallurgy, particularly relates to structure of cathode assembly of aluminium electrolytic cell and can be used at designing of new and reconstruction of operating electrolytic cells. Cathode assembly of aluminium electrolytic cell, containing - casing, coal baked in the hearth blocks, fixed in block by baked in the hearth mass current-carrying components and refractory plates, located under coal baked in the hearth blocks, current-carrying components are implemented in the form of packet of aluminium foil, located under each coal baked in the hearth block by all its surface, herewith coal baked in the hearth blocks are implemented as solid without bottom clearance. |
Composite material for moistened cathode of aluminium electrolytic cell / 2371523 Composite material for moistened cathode of aluminium electrolytic cell relates to field of non-ferrous metallurgy and, particularly to production techniques of aluminium by method of electrolysis of cryolite-aluminous melts. Composite material consists of moistened by liquid aluminium high-melting compound - titanium boride and binding agent, where in the capacity of binding agent it is used high-aluminous cement, herewith correlation of components of titanium boride: cement is selected 9:1. |
Method of producing polycrystalline cubic boron nitride / 2412111 Invention relates to production of synthetic superhard materials, particularly, polycrystalline cubic boron at high pressure and temperature to be sued in chemical, electronic and other industries. Proposed method comprises preparing mix of wurtzite-like and cubic modifications in relation of 1:4 to 2:1, respectively, processing it in planet mill for mechanical activation and crushing to grain size not exceeding 1 mcm, forming and annealing the mix at 1400-1800°C and 7.0-9.0 GPa, keeping at annealing temperature for time defined by conditions of transition on boron nitride wurtzite modification into cubic one without recrystallisation, equal to 5-30 s. Accurate time of keeping at preset temperature and pressure is defined proceeding from necessity of preservation of 5 to 15% of wurtzite boron nitride amount in initial mix. |
Method of making non-shrinking structural ceramic article / 2399601 Invention can be used to make articles from high-strength, non-shrinking ceramic materials working in high thermal-cycle loads in an oxidative, corrosive and aggressive atmosphere, and particularly in power generation installations. The starting material undergoes screening and deep cleaning. A mixture is prepared from components in the following ratio in mol %: boron nitride 12.5-17.5, aluminium 37-43, silicon carbide 42.5-46 and the mixture is mechanically activated. Primary workpieces are moulded from the mixture, dried and vacuum sintering is carried out at temperature between 1150 and 1250°C with residual pressure of 0.05 atm. The sintered workpieces are ground up and mechanically activated, after which articles are moulded and then vacuum sintered in conditions given above, mechanically processed, nitrogen hardened and oxidised. |
Method of obtaining composite material based on diamond and/or cubic boron nitride powder / 2393135 Invention relates to mechanical engineering and particularly to obtaining composite materials based on diamond and/or cubic boron nitride powder, which can be used, for instance as cutting elements in different instruments: drilling, driving instruments, in stone working instruments and instruments used in building industry etc. The method of obtaining composite material involves putting diamond and/or cubic nitride powder into a mould, packing and saturation with metals and/or alloys. The diamond and/or cubic nitride powder with different strength is used and packing is carried out at pressure whose value is selected from the condition Σst.>P>Σl st., where P is value of pressure during packing, Σst. is strength of powder with greater strength, Σl st. is strength of powder with less strength. |
Composite material for moistened cathode of aluminium electrolytic cell / 2371523 Composite material for moistened cathode of aluminium electrolytic cell relates to field of non-ferrous metallurgy and, particularly to production techniques of aluminium by method of electrolysis of cryolite-aluminous melts. Composite material consists of moistened by liquid aluminium high-melting compound - titanium boride and binding agent, where in the capacity of binding agent it is used high-aluminous cement, herewith correlation of components of titanium boride: cement is selected 9:1. |
Method of producing moulded aluminium oxynitride in burning mode / 2370472 Invention relates to making heat resistant ceramic materials, particularly to methods of producing aluminium nitride in burning mode. The method of producing aluminium oxynitride involves preparation of a reaction mixture of initial components, containing chromium (VI) oxide, aluminium oxide, aluminium and aluminium nitride, putting the reaction mixture into an SHS reactor in form of heat resistant material, made from quartz, graphite or stainless steel, ignition of the mixture with subsequent reaction of its components in burning mode under 0.1-10 MPa pressure in a nitrogen medium, or mixture nitrogen and air, or mixture of nitrogen and argon. After synthesis of the end product in form of an ingot, aluminium oxynitride is separated from the chromium aluminide ingot. Components of the reaction mixture are in the following ratio, wt %: chromium (VI) oxide 37.3-41.0; aluminium 31.0-34.0; aluminium oxide 22.7-25.0; aluminium nitride up to 9.0. A functional layer of aluminium oxynitride powder can be put between the reaction mixture of components and the wall of the mould. |
Method of connecting ceramic units from silicon nitride / 2365564 Invention relates to methods of connecting separate units from silicon nitride, which are used in manufacturing of constructional products, for instance nozzle apparatuses, long thermosteam covers and pipes (chlorine inputs), operating in aluminium melt at temperature 1200°C, glass-melting apparatuses for glass fibre stretching at temperature to 1600°C. Said technical result is achieved by the following: method includes preparing of glue mixture based on silicon nitride, which contains, wt %: 0.5-1.0 - melted magnesium oxide, 0.5-3.0 milted aluminuim oxide, 35-41 aluminiumboronphosphate binding agent and separately - similar mixture with alumochromephosphate binding agent, application on connected surfaces of units first mixture with aluminumboronphosphate binding agent, then mixture with alumochromephosphate binding agent with further coupling of said surfaces. Burning of connected product is carried out at temperature 1000°C with staying for 2 hours. |
Method of charge receiving containing aluminium nitride of cubic phase / 2361846 Method includes mixture preparation of superdispersed powders of aluminium and additions, burning of mixture on air up to achieving of maximal combustion temperature and quenching. In the capacity of addition it is used powder of tungsten or molybdenum at following correlation of components, wt %: superdispersed powder of aluminium - 97-98, superdispersed powder of tungsten or molybdenum - the rest. |
Structural material / 2348594 Structural material as per the invention is received from the charge material containing cilicide of carbon in the form of ultra fine fiber, ultra fine boron nitride and carbon fiber having periodically recurring internal volumes filled with helium at the following components ratio, volume %: boron nitride B11N15 30-94.6, carbon fiber 5-25, ultra fine cilicide of carbon 0.2-15, helium 0.2-30. Diamond - like layers are located in the contact spots of ultra fine fiber with carbon fiber, and cubic boron nitride layers are located in the contact spots with boron nitride. Helium and boron nitride have isotopic composition with light section of thermal neutron capture. |
Method of furnace charge preparation for zirconium boride products / 2344106 Invention refers to ceramic product industry, specifically to methods of furnace charge preparation for boron-carbide zirconium boride products. According to method qualitative composition of the additive activating product compaction is chosen from impurities contained in crude zirconium boride, namely from ZrO2 and/or ZrC2 and/or B4C. Its qualitative composition is calculated from stoichiometry of zirconium boride production from impurities and additive. |
Composite ceramic material for high-temperature application (versions) / 2336245 Composite ceramic material is produced on the base of refractory oxygen-free and oxide compounds to use in conditions which require high rigidity, firmness and oxidation stability: for manufacturing cutting tools, thermowells for temperature control in molten metals, nozzle extensions for air sand blowers, in gas and oil industry. Composite ceramic material containing ZrB2 and ZrO2, in the fist version additionally contains TiN and Y2O3 with following mixture ratio: wt %: ZrB2 20-40, Y2O3 4.5-10, TiN 10-25.5, ZrO2 - the rest, and in the second variant - ZrN and Y2O3 with following mixture ratio: wt %: ZrB2 20-40, Y2O3 4.5-10, ZrN 10-25.5, ZrO2 - the rest. |
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