摘要:
A cermet inert anode having a reduced level of contaminating surface metal is disclosed. Methods for preparing cermet inert anodes and methods for treating cermet inert anodes are also disclosed. The methods generally use an oxidizing agent to convert metals on the surface of the anode to inert oxides and/or to otherwise remove the metal contaminants. The inert anodes of the present invention may be used in electrolytic reduction cells for the production of commercial purity aluminum, as well as other metals.
摘要:
There is disclosed an improved memory disk stock comprised of an alloy composition which includes: about 1-11 wt. % magnesium, preferably between about 2-7 wt. % Mg; up to about 0.3 wt. % zirconium preferably about 0.02-0.25 wt. % Zr; up to about 0.2 wt. % iron, up to about 0.2 wt. % silicon, and about 0.02-0.2 wt. % of a dispersoid-forming element selected from scandium, erbium, thulium, lutetium, ytterbium, hafnium and yttrium, the balance aluminum and incidental elements and impurities. With preferably about 0.05-0.15 wt. % of scandium added to such compositions, these disk stocks exhibit significant room temperature yield strength increases over the same compositions without any scandium added.
摘要:
A substantially nitrate-free solution for milling products of refractory metals, especially titanium, which milling solution comprises: (a) about 20-100 g/l hydrofluoric acid; (b) a hydrogen inhibitor selected from the group comprising of: about 55-650 g/l of sodium chlorate, about 180-650 g/l of ammonium peroxysulfate, and at least about 10 g/l of hydrogen peroxide; and (c) a balance of water and impurities. A method for chemically milling, etching and/or pickling metal products, such as titanium alloy forgings, with the aforementioned solution is also disclosed.
摘要:
An electrolysis cell (10) contains a number of carbon anodes (12) having top, bottom and side surfaces, operating in molten electrolyte (17) in an aluminum electrolysis cell (10), where gas bubbles (28) are generated at the anode surfaces and where alumina particles (20) are added to the top of the molten electrolyte, where the carbon anodes (12) have one inward slot (21) passing through the carbon anode (12) along the longitudinal axis 40 of the carbon anode and also passing through only one front surface (25) of the carbon anode, where the height (32) of the slot (21) is from about 45% to 80% of the anodes thickness and the slotted front surfaces (25) are disposed toward the center of the electrolysis cell so that generated gas bubbles (28) are directed to the alumina particles.
摘要:
An aluminum alloy contains at least about 0.01 to 0.2 weight percent gallium, at least about 0.01 to 0.2 weight percent tin, and at least about 0.01 to 0.2 weight percent lead. In another embodiment, the alloy may contain at least about 0.01 to 0.2 weight percent indium in lieu of the tin. The balance of both alloys is aluminum, tolerable levels of trace metals, and impurities. Preferably, the aluminum is present in 99.9% purity. The alloy can be used advantageously as an anode in an aluminum-air battery. The gallium-tin-lead aluminum alloy when used as an anode, is preferably used with a salt water electrolyte. The gallium-indium-lead alloy, when used as an anode is preferably used with a caustic electrolyte. The aluminum base alloy may be used as an anode in a battery assembly, a housing, an anode of the present invention, a cathode, and a support means within the housing to secure the anode and cathode in a relative spaced relationship.
摘要:
The present invention discloses a method and apparatus for continuous analysis of a gas and particulate stream. More particularly, the present invention provides a method and apparatus for continuously analyzing a gas and particulate exhaust stream comprising metal fluorides to determine the fluoride concentration of such stream. A sampling nozzle communicating with a sampling line is placed in a gas and particulate stream. A gas-dissolving solvent is injected into a portion of the stream in the inlet portion of the sampling nozzle forming an aerosol. This portion of the stream and aerosol form a mixture comprising aerosol, gas and particulate which flows through the outlet portion of the sampling nozzle and through the sampling line. The aerosol in the mixture impinges against the inner surface of the sampling line wetting such inner surface with solvent; such mixture is scrubbed in the sampling line to enhance dissolution of gas in the solvent. The solvent and particulate in such mixture are separated from undissolved waste gases in the mixture, and such separated solvent and particulate are transported to a continuous analysis means to determine the concentration of dissolved gas and particulate.
摘要:
Systems, methods and apparatus relating to evaluation of alumina feedstocks are disclosed. A system may include an alumina storage unit comprising an alumina feedstock, an alumina supply member in communication with the alumina storage unit and an aluminum electrolysis cell. The alumina feedstock of the alumina storage unit may periodically flow through the alumina supply member and to the aluminum electrolysis cell. A measurement device may be in communication with the alumina supply member, and may be configured to measure a supply member property and transmit a first signal to a processor. The processor may be configured to receive the first signal and produce supply member property data based, at least in part, on the first signal.
摘要:
Systems, methods and apparatus relating to evaluation of alumina feedstocks are disclosed. A system may include an alumina storage unit comprising an alumina feedstock, an alumina supply member in communication with the alumina storage unit and an aluminum electrolysis cell. The alumina feedstock of the alumina storage unit may periodically flow through the alumina supply member and to the aluminum electrolysis cell. A measurement device may be in communication with the alumina supply member, and may be configured to measure a supply member property and transmit a first signal to a processor. The processor may be configured to receive the first signal and produce supply member property data based, at least in part, on the first signal.
摘要:
The present invention provides a eutectic aluminum base alloy and anode made therefrom which may include at least two elements from the group consisting of scandium, bismuth, cadmium, gallium, indium, lead, mercury, thallium, tin, and zinc. The alloying elements are present in the aluminum alloy in such quantity that they are at least in part liquid at the sites of local reaction on the anode. The preferred alloying components are eutectics of the elements. The alloys and anodes have a high overpotential for water reduction. The purity of the aluminum is preferably at least about 99.99%. Preferred compositions are aluminum-gallium-indium, aluminum-gallium-indium-tin, aluminum-gallium-indium-tin-zinc, aluminum-gallium-indium-zinc, aluminum-gallium-zinc, aluminum-gallium-tin, and aluminum-bismuth-cadium-indium-lead-tin. The alloying elements may preferably be present in a total amount of about 0.01 to 3.0 percent based on total alloy weight. In an alternate embodiment a molten anode may be employed.
摘要:
A method of making a light metal-rare earth metal alloy includes mixing a light metal powder, such as aluminum powder, with a finely divided rare earth metal-containing compound, such as scandium oxide, creating a billet by subjecting the mixture to cold isostatic compaction. The billet formed from the mixture of aluminum powder and rare earth metal-containing compound is preferably sintered at a temperature of about 600.degree. C. to 800.degree. C. and preferably about 640.degree. C. to 680.degree. C., and subsequently feeding the billet to a molten aluminum bath. This method facilitates conversion of in excess of 95% of the rare earth metal oxide to the aluminum-rare earth metal alloy. The rare earth metal may be scandium.