Abstract: A method for controlling hydrogen charging of hydride forming metals through a window of a superimposed layer of a non-hydriding metal overlying the portion of the hydride forming metals to be charged.

Abstract: A process of preparing manganite, MnOOH, from an aqueous manganese (II) nitrite solution by a fast batch decomposition in the presence of an "active" solid surface.

Abstract: A process for stripping tungsten values from a tungsten-bearing acidic liquid organic phase into a basic aqueous ammoniacal stripping solution comprises mixing the organic phase and the stripping solution with a high-shear mixing device to maximize the pH gradient between the organic phase and the aqueous solution whereby growth of any precipitated ammonium paratungstate crystals is minimized and the dissolution thereof is maximized and to strip the tungsten values from the organic phase into the stripping solution.

Abstract: In a process for producing pure ammonium paratungstate from ammonium tungstate solutions containing tin, sulfide is added to the ammonium tungstate solution in an amount sufficient to form a soluble complex of the sulfide with the tin. The solution is then evaporated to a volume at which essentially all of the tungsten is in the form of insoluble ammonium paratungstate and essentially all of the tin is in the mother liquor in the form of a soluble complex along with other impurities. The solid ammonium paratungstate is then separated from the mother liquor by filtration.

Abstract: A process of preparing manganite, MnOOH, from an aqueous manganese (II) nitrite solution by a continuous two-step decomposition process in the presence of an "active" solid surface.

Abstract: New energetic salts NF.sub.4 XeF.sub.7 and (NF.sub.4).sub.2 XeF.sub.8 are prepared by reacting NH.sub.4 HF.sub.2 with XeF.sub.6 and exposing NF.sub.4 XeF.sub.7 to blue 4880 .ANG. laser light.

Abstract: Ammonium molybdate is produced from molybdenum disulfide concentrate by contacting the concentrate with an aqueous solution of ammonium chloride and chlorine at suitable concentrations and for a sufficient period of time to solubilize molybdenum disulfide present in said concentrate as molybdate ions and form a solution of ammonium molybdate.

Abstract: Disclosed is method of recovering tantalum from silicon-containing tantalum scrap, which comprises dissolving said scrap in an inorganic acid, bringing the resulting solution into contact with an anionic exchange resin, followed by washing said anionic exchange resin with (a) a solution of 3 to 10 mol/l. of hydrofluoric acid or (b) a solution of strongly acidic medium containing 0.01 to 0.5 mol/l. of hydrofluoric acid and 1 to 6 mol/l. of a strong acid, and then washing the same with an aqueous solution of a mixture composed of hydrofluoric acid, aqueous ammonia and an ammonium salt.

Abstract: Bauxite is reacted with spent caustic soda solution at 113.degree. C. to 205.degree. C. to produce a first pregnant liquor stream, a granular residue stream and a muddy substance stream wherein the granular residue stream is discarded, the muddy substance stream is reacted with or without a small portion of bauxite, but with a spent caustic soda stream at 206.degree. C. to 350.degree. C. to produce a second pregnant liquor stream and a red mud stream which is discarded; the first and second pregnant liquor streams are filtered, cooled to 50.degree. C. to 87.degree. C. and then seeded to precipitate alumina hydrate containing less than 0.017% Fe.sub.2 O.sub.3 by weight.

Abstract: A hydrometallurgical process is provided for the recovery of molybdenum values from a molybdenum disulfide concentrate containing copper. The process comprises forming an aqueous slurry of finely divided molybdenum concentrate of carbonates and hydroxides of alkali metals, and pressure leaching the slurry in the presence of oxygen at an elevated temperature and pressure for a time sufficient to effect conversion of the contained molybdenum values to alkali metal molybdate and provide a residue containing copper oxide or basic copper carbonate from which copper is later recovered. The molybdenum values are recovered from solution by solvent extraction and the solvent thereafter stripped of the molybdenum as ammonium molybdenum using ammonium hydroxide. The molybdenum is recovered as crystals of ammonium molybdate by crystallization, e.g., by evaporating the stripping solution.

Abstract: A method for the removal of molybdenum from solutions containing molybdenum and other mineral values such as tungsten is accomplished by mixing the leachate solution with hydrogen peroxide to form a feed solution; the feed solution is contacted with a porous membrane, the opposite side of which is continuously contacted with an organic solution containing tributylphosphate. Additionally, for recovery of molybdenum, the tributylphosphate solution is additionally contacted with a second membrane the opposite side of which is contacted with a stripping solution such as a solution of sodium hydroxide or sodium carbonate. In a continuous ion exchange embodiment, the organic solution containing tributylphosphate is recirculated to contact the second side of the first membrane, preferably after passage through an aqueous separator.

Abstract: Sodium oxalate impurity is removed from oxalate-enriched Bayer process caustic liquor by gradual increase of the caustic concentration of the liquor, thus providing a staged precipitation of the sodium oxalate in a well-crystallized and readily filterable form.

Abstract: Vanadium and nickel values are selectively recovered from a petroleum coke residue by slurrying the coke in an aqueous solution of sodium carbonate providing an excess of the stoichiometric amount of sodium for formation of sodium vanadate and sodium sulfate, and then digesting the slurry at moderately elevated temperature in a pressurized autoclave under an oxygen overpressure supplying at least the stoichiometric amount of oxygen based on the vanadium and sulfur content of the slurry and advantageously sufficient additional oxygen to provide the thermal requirements of the digestion step by oxidation of carbon. In a continuous embodiment, the feed slurry temperature and feed solids content are adjusted according to a substantially inversely correlated relationship. The digestion temperature for a given total pressure and gas flow rate in the autoclave is adjusted to generate a pregnant liquor containing about 20 gpl to about 100 gpl of vanadate (V.sub.2 O.sub.

Abstract: A process of chlorinating titanium ore suspended with carbonaceous reductant in molten salt by passage of chlorine therethrough. Titanium tetrachloride produced is purified of by-product metal chlorides by their absorption in the salt as non-volatile double salts.

Abstract: A method for recovering superalloy scrap is disclosed. The method involves oxidizing superalloy scrap in an aqueous acidic medium. The aqueous acidic medium has an oxidation potential sufficient to oxidize nonferrous additive superalloy elements to insoluble oxides thereof and to oxidize major superalloy constituents to aqueously soluble species. The insoluble solids from the aqueous solution are separated when the aqueous solution is extracted with an aqueously substantially insoluble tertiary amine to form an organic phase and an aqueous phase. The aqueous phase contains essentially nickel and chromium values. The organic phase is sequentially extracted with aqueous solutions which selectively solubilize individual metal value species to form individual aqueous solutions having substantially single metal value species therein. The metal value species solutions are processed to obtain substantially pure metals.

Abstract: A method of recovering metal values from an aqueous stream. The metal valves are preferably obtained from leaching spent hydroprocessing catalysts, and include cobalt, nickel, molybdenum and vanadium. The metal values are extracted, isolated, and purified by liquid extraction techniques.

Abstract: An entrained flow process for chlorinating fine iron-containing titaniferous powder with chlorine gas and/or organochlorides in the presence of fine porous coal-based reductant powder for obtaining product chlorides of titanium and iron wherein said both of said powders are entrained in and flow downwardly through a chlorination reaction zone at a temperature of at least about 800.degree. C. is improved by: (a) supplying fine titaniferous and reductant powders to said reaction zone at a rate sufficient for establishing and maintaining titanium, iron and carbon reactants therein in substantial excess over those stoichiometric for the complete reaction of the chlorine present; (b) employing as at least the major portion of fresh reductant feed reactive char having surface area of at least about 10 m..sup.2 /g.

Abstract: A manufacturing process for making a finer ferrite powder which can then be used to make a very dense block of the ferrite ceramic. The process for making the powder includes the steps of co-precipitation of an aqueous solution of metal ions and an ammonium oxalate solution. The co-precipitation particles are separated, washed and dried. The particles are low-temperature calcined and then vibro-energy or ball milled and dried. The particles are fluffed and broken up in a blender and pressed into a mold for sintering and pressing in a hot isostatic press procedure. The ferrite blocks are then post annealed in an oxygen atmosphere and cooled to form a dense magnetic ceramic particle. Preferably the process is for use in the production of nickel-zinc ferrite used for magnetic heads.

Abstract: A method of preparing electrically conductive pyrochlore compounds of high surface area and unagglomerated form, having the formulaA.sub.2 [B.sub.2-x A.sub.x ]O.sub.7-yis disclosed wherein A is selected from lead, bismuth and mixtures thereof, B is selected from ruthenium, iridium and mixtures thereof, 0<x.ltoreq.1.0 and 0.ltoreq.y.ltoreq.1. The method involves (1) synthesizing the pyrochlores in an aqueous alkaline reaction medium having a pH of at least about 12.0 and in the presence of an oxygen source (2) displacing the reaction medium with water, (3) atomizing the resultant slurry and (4) freeze drying the resultant product. The pyrochlore compounds thus prepared have a variety of applications including use as oxygen electrodes in electro-chemical devices.

Abstract: A method of producing a vanadium-based metal hydride which comprises reacting hydrogen gas at a temperature between about 0.degree. and 100.degree. C. with a vanadium-based binary solid solution alloy having a body-centered cubic structure and having a formula V.sub.1-x M.sub.x, wherein M is a metal selected from the group consisting of manganese, chromium, cobalt, iron, nickel and mixtures thereof and wherein x varies from at least about 2 atom percent up to the solubility limit of cobalt, iron and nickel and up to about 20 mol % of manganese and up to about 40 mol % of chromium in said solid solution alloy is disclosed.