Abstract: A method for dissolving base metals and noble metals from ores having base metals and noble metals which comprises adding the ore to a solution of a non-acid oxidizing agent, then adding an aqueous solution of an acid forming halide and then adjusting the H+ concentration of the combined solutions to a minimum H+ concentration of 1 mol/l.

Abstract: This invention concerns catalysts comprising a molybdenum compound of formula I, II, III, IV or V I VqMoAyOz II NiMoxByOz′ III VNiwMoxCy′Oz″ IV CoNiwMoxDyOz′″ V VNiwCorMoxEyOz″″ wherein: A is at least one cation selected from the group consisting of cations of: Cr, Sb, Co, Ce and Pb; B is at least one cation selected from the group consisting of cations of: Sb, Al and W; C is at least one cation selected from the group consisting of cations of: Fe, Zn, Al, Sb, Bi, W, Li, Ba, Nb and Sn; D is at least one cation selected from the group consisting of cations of: Ba, Mn, Al, Sb, Sn, and W; E is at least one cation selected from the group consisting of cations of: Fe, Ca, Mn, Sr, Eu, La, Zr, Ga, Sn and Pb; q, r, w, x and y are each independently a number from 0.1 to 10 and y′ is a number from 0 to 10, z, z′, z″, z′″, and z″″ are determined using the amounts and oxidation states of all cations present in each formula.

Abstract: A method of treating metal-contaminated spent foundry sand, or other industrial waste, by combining the sand with a sulfite to produce insoluble metal sulfur oxide complexes that do not leach from the sand. The treated waste may also be processed to reduce “clumping,” thereby rendering the treated waste appropriate for use in another industrial process.

Abstract: The present invention provides a clathrate compound which can be used as a thermoelectric material, a hard material, or a semiconductor material. Silicon or carbon are formed into a clathrate lattice, and a clathrate compound is then formed in which specified doping atoms are encapsulated within the clathrate lattice, and a portion of the atoms of the clathrate lattice are substituted with specified substitution atoms. The clathrate lattice is, for example, a silicon clathrate 34 (Si34) mixed lattice of a Si20 cluster including a dodecahedron of Si atoms, and a Si28 cluster including a hexahedron of Si atoms. Suitable doping atoms are atoms from group 1A, group 2A, group 3A, group 1B, group 2B, group 3B, group 4A, group 5A, group 6A, and group 8, and suitable substitution atoms are atoms from group 1A, group 2A, group 3A, group 1B, group 2B, group 3B, group 5A, group 6A, group 7A, group 5B, group 6B, group 7B, and group 8 of the periodic table.

Abstract: The present invention provides reducing electrolyzed water which has a pH of 3 to 12 and an oxidation-reduction potential of up to −200 mV, preferably a pH of 5 to 11 and an oxidation-reduction potential of up to −500 mV, and in which the common logarithm of the product of the hydrogen ion concentration [H+] and the electron concentration [e−] is at least −4.5, preferably at least 0. The reducing electrolyzed water is used as potable water, agricultural fertilizers, drip solutions and other injections, dialysis solutions and face lotion, and particularly shows significant medical effects.

Abstract: The invention relates to a method, composition and apparatus for stabilizing mercury and other heavy metals present in a particulate material such that the metals will not leach from the particulate material. The method generally involves the application of a metal reagent, a sulfur-containing compound, and the addition of oxygen to the particulate material, either through agitation, sparging or the addition of an oxygen-containing compound.

Abstract: A process for the recovery of one or more metal values from a metal ore material comprising those of one or more values and a matrix material having a sulfur content wherein the sulfur is present in an oxidation-reduction state of zero or less comprising a. forming particulates from particles of said ore and an inoculate comprising bacteria capable of at least partially oxidizing the sulfur content; b. forming a heap of said particulates; c. biooxidizing the sulfur content and d. recovering those one or more metal values.

Abstract: A process is provided for the direct recovery of nickel and cobalt from a nickeliferous oxide ore leach slurry by ion exchange. A nickeliferous ore is leached with mineral acid to solubilize the metals. The resulting leach slurry is contacted with ion exchange resin, which selectively loads the nickel and cobalt from the pulp. The resin is separated from the leach slurry by screening and then stripped with an acidic solution. After stripping, the resin is returned to the loading cycle. Nickel and/or cobalt can be recovered in substantially pure form from the eluate by known processes. The metal-depleted slurry proceeds to waste treatment and disposal. This process eliminates the difficult solid/liquid separation, which would otherwise be required to recover metals values from the pregnant leach slurry.

Abstract: Disclosed is a positive active material of for a rechargeable lithium battery and a method of preparing the same.

Abstract: The present invention provides a method for fluidized bed roasting of molybdenite to molybdenum trioxide. A fluid bed reactor separated into separate zones is used to provide plug flow conditions. A cooling tube is submerged in the fluid bed to control temperature. A vibrator is used to enhance fluidization.

Abstract: There is provided a process to reclaim metals from catalysts, said process comprising collecting one or more catalyst containing at least one metal sulfide; leaching the catalyst in an atmospheric leach step; separating the leached slurry into a first liquid stream and a first solid; leaching the first solid in a pressure leach process; separating the second leached slurry into a second liquid stream and a second solid; collecting the first and second liquid streams; oxidizing the combined liquid stream; cooling the oxidized liquid stream; adjusting the pH of the oxidized liquid stream; contacting the cooled oxidized liquid stream with an organic solvent containing an extractant; stripping the soluble metal species from the organic phase; adjusting the pH of the aqueous phase to selectively precipitate at least one metal as a metal salt; and separating the metal salt from the aqueous phase.

Abstract: The invention relates to a process for recovering the transition metal component of catalysts used in the hydroconversion of heavy hydrocarbonaceous materials. In accordance with the invention, a slurry of a transition metal catalyst and hydrocarbon is catalytically desulfurized resulting in a desulfurized product and a solid residue containing the transition metal. The transition metal may be recovered by coking the residue and then dividing the coker residue into two portions are combusted with the flue dust from the first combustion zone being conducted to the second combustion zone. The flue dust from the second combustion zone is treated with ammonia and ammonium carbonate in order to obtain ammonium molybdate.

Abstract: A method for purifying a phosphorus containing scheelite ore is described wherein the calcite phase is selectively dissolved prior to dissolution of the apatite phase. Selective dissolution of the calcite produces several benefits: (1) a usable calcium solution, (2) enhanced apatite dissolution, and (3) lower volumes of toxic acid solution for disposal.

Abstract: Formation of hexavalent chromium is reduced during incineration/combustion of materials containing hexavalent chromium by adding to the waste prior to or during combustion a small amount of sulfur. The sulfur can be added as elemental sulfur, as sulfur dioxide, or as high sulfur fuels or high sulfur waste.

Abstract: A method of preparing a polycrystalline thin film of a transition metal chalcogenide of an orientation on a substrate which includes (a) depositing a layer of a transition metal material or mixtures thereof on the substrate; and (b) heating the layer in an open system in a gaseous reducing atmosphere containing one or more chalcogen materials for a time sufficient to allow the transition metal material and the chalcogen material to react and form the oriented polycrystalline thin film, the thin film being substantially exclusively oriented in the orientation. Also provided is a method of synthesizing structures of a transition metal chalcogenide selected from the group consisting of single layer or nested or stuffed inorganic fullerenes and nanotubes, including the step of reacting a transition metal compound with a volatile chalcogen compound in a reducing atmosphere at a temperature between about 750.degree. C. and about 1000.degree. C.

Abstract: The present invention relates to methods for digesting diphosphonic acid substituted cation exchange resins that have become loaded with actinides, rare earth metals, or heavy metals, in a way that allows for downstream chromatographic analysis of the adsorbed species without damage to or inadequate elution from the downstream chromatographic resins. The methods of the present invention involve contacting the loaded diphosphonic acid resin with concentrated oxidizing acid in a closed vessel, and irradiating this mixture with microwave radiation. This efficiently increases the temperature of the mixture to a level suitable for digestion of the resin without the use of dehydrating acids that can damage downstream analytical resins. In order to ensure more complete digestion, the irradiated mixture can be mixed with hydrogen peroxide or other oxidant, and reirradiated with microwave radiation.

Abstract: A method for recovering tungsten from a tungsten containing spent catalyst comprises digesting the catalyst in aqueous sodium hydroxide solution wherein the mole ratio of the sodium hydroxide to the tungsten contained in the spent catalyst is from about 2.6 to about 4.2 and wherein the amount of water is sufficient to dissolve the subsequently produced sodium tungstate, at a temperature of at least about 90.degree. C. for a length of time of at least about 1 hour to convert greater than about 77% by weight of the tungsten contained in the spent catalyst to sodium tungstate and form a sodium tungstate solution thereof and a residue containing the balance of the starting tungsten, and separating the sodium tungstate solution from the residue. Essentially all of the tungsten is recovered as sodium tungstate by first grinding the catalyst prior to the digestion and by using a mole ratio of sodium hydroxide to tungsten of about 3.8 to 4.2.

Abstract: A process for forming a salt, such as sodium tungstate, using a pyrometallurgical operation is provided. A slagging operation is performed in which a metal-containing material is melted in the presence of slag formers such as sodium metasilicate and silica. The metal predominantly reports to a denser metal-containing phase. The denser metal-containing phase may then be subjected to gas sparging with a carbon-containing gas in order to form metal carbide, preferably tungsten carbide.

Abstract: A method for producing engineered materials from salt/polymer aqueous solutions in which an aqueous continuous phase having at least one metal cation salt is mixed with a hydrophilic organic polymeric disperse phase so as to form a metal cation/polymer gel. The metal cation/polymer gel is then treated to form a structural mass precursor, which structural mass precursor is heated, resulting in formation of a structural mass having predetermined characteristics based upon the intended application of the structural mass.

Abstract: A method for producing purified MoO.sub.3 from MoS.sub.2. MoS.sub.2 is initially oxidized to generate an impure MoO.sub.3 product containing metallic contaminants and molybdenum sub-oxides. This product is then slurried with a primary water supply to yield a first slurry in which part of the contaminants are dissolved. Preferred slurry temperatures are 25.degree.-97.degree. C. The resulting solid intermediate MoO.sub.3 product is removed from the slurry leaving the dissolved contaminants. Next, the intermediate MoO.sub.3 product is slurried with a secondary water supply to yield a second slurry in which the remaining contaminants are dissolved. Second slurry temperatures of 150.degree.-250.degree. C. are employed in the presence of an oxygen-containing gas. These conditions oxidize molybdenum sub-oxides to yield MoO.sub.3. The resulting purified solid MoO.sub.3 product is then removed from the second slurry. This process is highly efficient and avoids using liquid reagents other than water (including acids).

Abstract: A method for producing MoO.sub.3 from MoS.sub.2. MoS.sub.2 is combined with water to form a slurry which is then combined with at least one oxygen-containing oxidizing gas in a reaction chamber in order to initiate oxidization and conversion of MoS.sub.2 into MoO.sub.3. The oxidization and conversion of MoS.sub.2 into MoO.sub.3 is terminated before complete conversion of MoS.sub.2 to MoO.sub.3 takes place in order to generate a solid reaction product comprising MoO.sub.3 and unreacted MoS.sub.2 in combination with a residual liquid product comprising dissolved Mo therein. The oxidization and conversion process may be terminated when about 70-95% by weight MoS.sub.2 has been converted to MoO.sub.3. Thereafter, the solid reaction product is separated from the residual liquid product and the residual liquid product combined with at least one extractant in order to generate a liquid fraction containing dissolved Mo.

Abstract: The present invention provides a process for preparing a molybdenum, molybdenum silicide or molybdenum carbide/ceramic admixture, comprising dissolving molybdenum trioxide powder with an alkaline solvent to obtain an aqueous solution of molybdate; incorporating ceramic powder with or without silicon and/or carbon powder into the aqueous solution of molybdate to obtain a slurry; and subjecting the slurry to spray drying and reduction to obtain the admixture. The obtained admixture can be formed and sintered into a nanometer-sized and uniformly dispersed molybdenum, molybdenum silicide or molybdenum carbide/ceramic sintered composites.

Abstract: Amorphous tungsten, cobalt, nickel, molybdenum, iron and alloys thereof can be formed by reducing metal-containing compositions to form the elemental metal wherein the particle size of the elemental metal is less than about 80 microns. This is oxidized in an oxygen-starved environment containing less than 3% oxygen and an inert gas to slowly oxidize the elemental metal. By oxidizing the metal under these conditions, the normal exotherm occurring during oxidation is avoided. The slow oxidation of the metal continues forming an amorphous metal oxide. The amorphous metal oxide can then be reacted in a reducing environment such as hydrogen to form the amorphous elemental metal. This amorphous elemental metal can then be reacted with a carburizing gas to form the carbide or ammonia gas to form the nitride or hexamethylsilane to form the silicide. This permits gas/solid reactions. The amorphous metal can also be used in a variety of different applications.

Abstract: A process for producing nano size powders comprising the steps of mixing an aqueous continuous phase comprising at least one metal cation salt with a hydrophilic organic polymeric disperse phase, forming a metal cation salt/polymer gel, and heat treating the gel at a temperature sufficient to drive off water and organics within the gel, leaving as a residue a nanometer particle-size powder.

Abstract: According to the invention there is now provided a simple method of preparing a powder containing WC and cobalt and/or nickel. APT-powder and a powder of a basic salt of cobalt and/or cobalt are mixed in water or in mixed solvents. The suspension is stirred to react at temperatures ranging from room temperature to the boiling point of the solution whereby a precipitate is formed, which precipitate is filtered off, dried and finally reduced to a metallic powder.

Abstract: A method of dissolving metal oxides using a mixture of a di- or polyphosphonic acid and a reductant wherein each is present in a sufficient amount to provide a synergistic effect with respect to the dissolution of metal oxides and optionally containing corrosion inhibitors and pH adjusting agents.

Abstract: A process for recovery of chromium in an aqueous solution comprising converting the chromium to chromyl chloride, separating the chromyl chloride from the aqueous solution, either as a heavy underlayer, or by extraction into a solvent, purifying the chromyl chloride, hydrolyzing the purified chromyl chloride to form a solution, and drying or precipitating the solution to form chromium, either as chromic acid or a chromate salt.

Abstract: A process for the decomposition of chrome ore by alkaline oxidation bymixing finely divided chrome ore with alkaline compounds,heating the mixture in an indirectly heated rotary kiln to between 800.degree. and 1,200.degree. C.,introducing oxygen or gases enriched with oxygen countercurrently to the mixture, whereinthe mixture of chrome ore and alkaline compound is divided into a large number of individual streams,each individual stream is fed into a separate indirectly heated rotary kiln,the large number of rotary kilns is combined in the form of a bank of kilns,the theoretical distance covered by the particles of the mixture through the rotary kiln is 5 to 30 m, andthe resulting average coverage of the inner surface of the rotary kiln is 1 to 5 kg of mixture/m.sup.2.

Abstract: In a method of separating fission molybdenum from other fission products, wherein an aqueous solution of the fission molybdenum and the other fission products is supplied to a packet bed of manganese dioxide whereby the fission molybdenum and part of the other fission products are retained in the bed whereas the rest of the fission products is carried away with the aqueous solution and the fission molybdenum is recovered from the fission molybdenum-charged packet bed, the packet bed consists of hydrated manganese dioxide of a particle size of 0.2-0.5 mm from which any finer particles have been removed by a liquid sedimentation procedure.

Abstract: Epoxidate from the molybdenum catalyzed epoxidation of an olefin such as propylene with a hydroperoxide such as ethylbenzene hydroperoxide is treated with 2 to 15 times the stoichiometric equivalent of aqueous base such as sodium hydroxide to form Na.sub.2 MoO.sub.4 and the resulting mixture is phase separated to separate an organic phase reduced in molybdenum and a net aqueous stream containing removed molybdenum, the mass ratio of the organic phase to the net aqueous stream being 450-3,000/I.

Abstract: The invention relates to a process for the low-waste production of sodium dichromate from the mineral chromite with simultaneous recovery of low-carbon ferrochromium.

Abstract: A chemical process for treating pit waste contaminated with chromated copper arsenate (i.e. CCA). CCA is recovered for recycling, and remaining solids are decontaminated for safe disposal. Pit wastes are pulverized and reacted with concentrate sulfuric or phosphoric acid. Wood particles are partially decomposed and approximately 60% to 70% of the CCA is leached out. The acid-treated mixture is centrifuged or filtered to separate liquids from solids. Liquids are recycled for reuse in the CCA process. CCA-bearing solids enter a heated digester equipped with an air or water cooled condenser. Concentrated nitric and sulfuric acids are inputted into the digester and the ratio of nitric acid to sulfuric acid to solids is approximately six to two to one by volume. Nitric acid completely oxidizes all organic matter in the solids. Sulfuric acid serves as a dehydrating agent and liquid media for CCA. The initial oxidation is carried out at a temperature greater than 70.degree. C. and less than 100.degree. C.

Abstract: A process for dissolving used catalyst includes the steps of roasting, after subjecting to an optional deoiling treatment, the used catalyst at a temperature lower than 1,000.degree. C. but not lower than the temperature at which any of the residual components in the used catalyst undergoes ignition and combustion where the residual components are selected from the group consisting of oils, sulfur components, and carbon components; and dissolving the roasted product using sulfuric acid after adding a metal to the roasted product as a catalyst for accelerating dissolution. The process provides a simple and efficient method for completely dissolving a used catalyst having a carrier containing alumina as the principal component.

Abstract: Thick oriented films are produced from oxides of molybdenum, tungsten or titanium. These films comprise a plurality of single-molecular thickness layers of semi-crystalline oxide having parallel basal planes. The oxides are produced by sintering highly oriented films of the corresponding metallic sulfide at a temperature of 300.degree.-350.degree. C. The film may be deposited on a substrate between electrical contacts to function as a gas sensor for hydrogen.

Abstract: According to a process for converting chromium dioxide into chromium (III) oxide, a composite comprising chromium dioxide particles dispersed in an organic matrix is provided. In a first heating step, a feed consisting essentially of the composite is heated under conditions sufficient to convert the feed into an admixture comprising chromium oxide and carbon. In a second heating step, the admixture is heated under conditions such that substantially all of the chromium oxide in the admixture is converted into chromium (III) oxide. In preferred embodiments, the composite is a chromium dioxide-based magnetic recording medium.

Abstract: A process for selective separation of strontium-82 and strontium-85 from proton irradiated molybdenum targets is provided and includes dissolving the molybdenum target in a hydrogen peroxide solution to form a first ion-containing solution, passing the first ion-containing solution through a first cationic resin whereby ions selected from the group consisting of molybdenum, niobium, technetium, selenium, vanadium, arsenic, germanium, zirconium and rubidium remain in the first ion-containing solution while ions selected from the group consisting of rubidium, zinc, beryllium, cobalt, iron, manganese, chromium, strontium, yttrium and zirconium are selectively adsorbed by the first resin, contacting the first resin with an acid solution capable of stripping adsorbed ions from the first cationic exchange resin whereby the adsorbed ions are removed from the first resin to form a second ion-containing solution, evaporating the second ion-containing solution for time sufficient to remove substantially all of the acid

Abstract: The invention is a process for removing a chromium containing coating from an aluminum article. The chromium containing coating is removed from the aluminum article by contacting the aluminum article having the chromium containing coating with an alkaline treating bath to form an ultrasonically removable chromium containing coating and treating the aluminum article with the ultrasonically removable coating with ultrasonic vibrations to remove the chromium containing coating.

Abstract: Semiconductor grade tungsten hexafluoride (WF.sub.6) is produced by reacting tungsten metal with a recirculating flow of gaseous WF.sub.6 containing a small concentration of fluorine in a heated reactor. The high purity WF.sub.6 produced is useful for deposition of tungsten metallization in fabricating VLSI integrated circuitry.

Abstract: A method for preparing molybdenum and sulfur containing compounds of the general formula X.sub.2 Mo.sub.2 S.sub.12.yH.sub.2 O, where X is a cation selected from the group consisting of Na.sup.+, K.sup.+, R.sub.4 N.sup.+, R.sub.3 NH.sup.+, R.sub.2 NH.sub.2.sup.+, RNH.sub.3.sup.+, NH.sub.4.sup.+, R.sub.4 P.sup.+, R.sub.4 As.sup.+,(R.sub.3 P).sub.2 N.sup.+, R is a C.sub.1 -C.sub.30 alkyl, C.sub.6 -C.sub.30 aryl, C.sub.7 -C.sub.30 aralkyl or C.sub.2 -C.sub.30 alkoxyalkyl group and mixtures thereof, and y is from 0 to 2. The method comprises preparing a sulfide solution that contains from about 9 wt. % to about 13 wt. % sulfide sulfur; contacting the solution with elemental sulfur and a hydroxide; adding a molybdenum compound for a time and at a temperature sufficient to form a reaction mixture and a precipitate; separating the precipitate; and contacting the remaining reaction mixture with additional sulfide solution to form (NH.sub.4 ).sub.2 Mo.sub.2 S.sub.12.yH.sub.2 O.

Abstract: A process for recovery of molybdenum from residual fractions derived from an epoxidation reaction of propylene with tertiary butyl hydroperoxide in liquid phase with tertiary butyl alcohol, in the presence of soluble molybdenum, which process comprises:Fractionating epoxidation reaction product for obtaining a liquid fraction containing essentially all molybdenum from the reaction product;Contacting the liquid fraction with anhydrous ammonia for forming a precipitate containing the major portion of the molybdenum and a liquid phase containing 500 ppm or less molybdenum;Separating the liquid phase from the precipitated solid;Evaporating the liquid phase under conditions of elevated temperatures and reduced pressure in the presence of 1 to 3% water for separation into an evaporator overhead vapor essentially free of molybdenum and an evaporator concentrate comprising essentially all of the molybdenum fed to the evaporator;Rapidly cooling evaporator concentrate from about evaporation temperature to about room te

Abstract: A method for the continuous treatment of air pollution control residues from various resource recovery systems whereby the air pollution control residue is treated with a dilute salt extracting solution at a pH chosen to maximize the recovery of lead, for a reaction time chosen to maximize the recovery of lead, and for a number of recycles chosen to maximize the recovery of lead from the particular residue being treated. Other metals and dissolved salts can also be recovered from the extracting solution. Thus by monitoring these three variables for each batch of residue, and adjusting the extracting solution accordingly, residue from various sources and of varying composition can be treated efficiently and continuously to remove hazardous metals and dissolved salts from the residue. Bottom residue fines, alone or admixed with air pollution control residues, can also be treated in accordance with the process of the invention.

Abstract: An improved method for substantially removing potassium from potassium-bearing molybdenum trioxide involves the use of a leach solution in a weight ratio of seven parts of the leach solution to one part molybdenum trioxide at a temperature of at least 90.degree. C.

Abstract: Chromium carbide powder and/or powder of an easily sulfidable metal are added to powdered crude metallic chromium to form a mixture thereof, which is then heated in vacuum to remove S, N and O by degassing so that consequently the crude metallic chromium is free from impurities to a possible maximum extent.Alternatively, powdered crude metallic chromium is heated in an atmosphere of inert gas to temperature between 800 and 1,400.degree. C. and then an easily sulfidable metal is added thereto to form a mixture thereof. Subsequently, the mixture is, directly or after adding carbon or chromium carbide, heated again in vacuum or in an atmosphere of inert gas to eliminate S, N and O by degassing so that the crude metallic chromium is free from impurities to a possible maximum extent.Still alternatively, powdered crude metallic chromium is washed with inorganic acid such as hydrochloric acid, sulfuric acid or nitric acid or organic acid such as acetic acid to remove metal impurities such as Fe.

Abstract: A method of releasing metals from catalysts in a form that is readily recoverable using denitrifying bacteria is disclosed. The method can be used to regenerate catalysts and to recover metals from catalysts, especially molybdenum and nickel.

Abstract: A method of refining tungsten hexafluoride containing molybdenum hexafluoride as an impurity includes the step of contacting the tungsten hexafluoride with at least one metal selected from the group consisting of Mo, W, Cu, Ni, Fe, Co, Zn, Ti, Al, Ca and Mg at a temperature ranging from 100.degree. to 500.degree. C. Molybdenum hexafluoride is efficiently removed from the tungsten hexafluoride by the method.

Abstract: A process for removing molybdenum from uranium bearing solutions reduces molybdenum contamination of uranium product. The process employs solvent extraction techniques to remove molybdenum by using a molybdenum-selective extraction reagent of the chelating hydroxy-oxime type. The molybdenum-loaded extractant is stripped with dilute alkali for reuse. Where the uranium bearing solution originates from a solvent extraction process, a pretreatment stage is applied using an agent to remove entrained uranium extractant.

Abstract: A method and apparatus for producing molybdenum trioxide from raw materials containing molybdenum disulfide including melting the raw materials in an oxidizing atmosphere volatilizing a major portion of the raw materials as molybdenum trioxide with the remainder bonded in a molten slag as MoO.sub.4 and directing an oxidizing gas onto the molten slag to convert the MoO.sub.4 to molybdenum trioxide with the volatilization gas and the gas from the slag being united, the gas cooled and the molybdenum trioxide condensed from the gas into solid form (undesirable admixtures are separated from molybdenum trioxide raw oxides hydrometallurgically).

Abstract: A method is disclosed for producing fine size molybdenum trioxide powder which involves heating ammonium dimolybdate in ambient atmosphere at a temperature of from about 455.degree. C. to about 465.degree. C. for a time of from about 5 hours to about 6 hours to produce a first molybdenum trioxide which is granulated to about -10 mesh and then heated in a furnace in which there are three heating zones. The first molybdenum trioxide is heated in the first heating zone at a temperature of from about 550.degree. C. to about 590.degree. C., in the second heating zone at a temperature of from about 580.degree. C. to about 610.degree. C. and thereafter in the third heating zone at a temperature of from about 580.degree. C. to about 625.degree. C., with the feed rate of material in the three zones being from about 1.5 to about 3.0 kg/hr to produce a yellow molybdenum trioxide. The yellow molybdenum trioxide is then cooled and granulated to about -40 mesh.

Abstract: Lithium metatungstate as a new composition of matter and the production thereof are disclosed. A solution of lithium monotungstate is treated with an extractant to remove sufficient lithium ions to produce a dilute solution of lithium metatungstate and the dilute solution is then concentrated. Lithium metatungstate solutions are more dense than other alkali metal metatungstates and have lower viscosities which properties make the solutions highly useful for heavy media separations.

Abstract: The present invention is directed to a method for treating a sludge containing substantial amounts of chromium, aluminum, calcium, iron, and phosphorous. The method comprises forming a slurry of the sludge; reacting the slurry with an acid to dissolve substantially all the aluminum and chromium and provide a solids residue comprising mostly calcium sulfate; separating the chromium/aluminum-containing solution from the solids residue; raising the pH of the chromium/aluminum solution to precipitate chromium as chromium hydroxide; and separating the chromium hydroxide from the remaining aluminum-containing solution. The chromium hydroxide is then enriched with an alkali or earth alkali compound and calcined in an oxidizing atmosphere to convert the chromium to a chromate. The calcine is leached in an aqueous medium at a controlled pH to yield a high concentration, high purity chromate solution suitable for producing metallic chromium or a variety of chromium chemicals.