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7445763 |
Coating powder of Cr or V doped titanium suboxides
A coating powder based on chemically modified titanium suboxides, for use in various coating techniques. Coatings produced from this powder are characterized by high electroconductivity, good solid...
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7354565 |
Lead iron tungstate capacitive transducer, relaxor material therefor and method of manufacture of said relaxor material
The present invention discloses a relaxor material lead iron tungstate which has been synthesized in doped and undoped conditions by single and two step heat treatment. The relaxor material is seen...
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7261820 |
Method for decreasing a concentration of metal in aqueous solution
A method and system for decreasing the concentration of at least one metal in an aqueous solution. The metal may be molybdenum, tungsten, or both. An aqueous solution is introduced into at least...
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7045112 |
Method of making manganese sulfide compositions
Disclosed herein are compositions of a manganese sulfide (MnS) compound useful as additives for making a sintered product. Also disclosed herein is a method of making the composistions in which...
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6395241 |
Process for recovering the carbide metal from metal carbide scrap
The process of the present invention relates to a process for recovering the carbide metal from metal carbide scrap wherein the metal is tungsten, titanium, vanadium, chromium or molybdenum, and...
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6149883 |
Pressure oxidation process for the production of molybdenum trioxide from molybdenite
Molybdenum trioxide is produced from molybdenite by a pressure oxidation process comprising of the steps of forming an aqueous slurry of molybdenite, pressure oxidizing the slurry to form soluble...
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6103392 |
Tungsten-copper composite powder
A high performance W--Cu composite powder is provided which is composed of individual particles having a tungsten phase and a copper phase wherein the tungsten phase substantially encapsulates the...
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5993756 |
Sodium tungstate preparation process
A method for the preparation of sodium tungstate by the oxidation of hard metal scrap and/or heavy metal scrap in a molten salt mixture of hydroxide and sodium sulfate.
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5932184 |
Method for recovery of tungsten from spent catalysts
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...
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5912399 |
Chemical synthesis of refractory metal based composite powders
A new tungsten compound is formed by reacting ammonium metatungstate with guanidine carbonate. Such a compound can be converted to metallic tungsten, tungsten carbide or oxycarbide, and tungsten...
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5882620 |
Pyrometallurgical process for forming tungsten carbide
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...
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5874056 |
Metal tungstates and method of preparing them and their use
Phase-pure, crystalline tungstates of general composition Me(II)WO 4 , where Me(II)=Co, Ni, Zn, Pb, Mg, Ca, Sr and/or Ba. These are prepared by wet mixing tungsten components (preferably ammonium...
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5819158 |
Reclamation of tungsten values from tungsten-thoria
A simple, cost effective method for reclaiming tungsten values from tungsten-thoria has been invented. The method involves reacting the tungsten-thoria with molten sodium hydroxide to form a...
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5776264 |
Method for producing amorphous based metals
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...
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5667759 |
Method for manufacturing alkali chromates from chromium ore
A method for the decomposition of chromium ore in a directly heated revolving tube is described, in which oxygen-containing gases are introduced into the revolving tube by means of below-bed nozzles.
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5594929 |
Method of preparing powders for hard materials
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...
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5547646 |
Process for the decomposition of chrome ore by alkaline oxidation
A process for the decomposition of chrome ore by alkaline oxidation by mixing finely divided chrome ore with alkaline compounds, heating the mixture in an indirectly heated rotary kiln to...
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5514360 |
Negative thermal expansion materials
A method for making tungstate compounds according to the formula XW 2 O 8 , wherein X is selected from the group consisting of zirconium, hafnium, and combinations thereof, is described. Also...
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5505918 |
Method for manufacturing alkali chromates from chromium ore
A method for manufacturing alkali chromates by the reacting of chromium ore with alkali compounds and oxidation in an atmosphere containing at least 50% oxygen is described, in which the mixture...
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5503813 |
Molybdenum recovery from epoxidate
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...
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5482690 |
Low-residue high-extraction production of sodium dichromate
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.
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5470549 |
Method of making tungsten-copper composite oxides
A method for making a tungsten-copper composite oxide wherein an amount of an ammonium tungstate and an amount of an oxide or hydroxide of copper are combined without milling to form a mixture. The...
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5374408 |
Process for the preparation of alkaline chromates from chromium minerals
A process for the production of alkaline chromates by means of oxidative disaggregation in a reactor of substances containing trivalent chromium compounds in admixture with alkali. The oxidative...
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5273726 |
Removal of aluminum from ammonium molybdate solution
Aluminum is removed from ammonium molybdate solution by the use of Mg +2 in the solution to precipitate out the aluminum.
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5273735 |
Process for the preparation of sodium dichromate
A process for the preparation of sodium dichromate and sodium dichromate solutions by alkaline oxidizing roasting of chromium ores, leaching resulting roast with water, adjustment of the pH to 7 to...
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5256608 |
High hardness, wear resistant materials
A powdered admixture of a boron, carbon, nitrogen or silicon derivative of a first metal is combined with a source of a second metal and, optionally, a source of a third metal or an iron-group...
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5250274 |
Process for the production of sodium dichromate
The invention relates to a process for the production of sodium dichromate and sodium dichromate solutions by oxidative roasting of chrome ores under alkaline conditions, leaching of the furnace...
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5082637 |
Removal of potassium from ammonium molybdate
Potassium impurity is removed from ammonium molybdate by dissolving the ammonium molybdate in hot acid, allowing the acid solution to cool whereby the ammonium molybdate precipitates out of the...
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5079199 |
Method of manufacturing dielectric ceramic compositions of lead-based perovskite
A manufacturing method for dielectric ceramic compositions of lead-based perovskite containing lead magnesium tungstate [Pb(Mg 1 /2 W 1 /2)O 3 ] as a component which is characterized in that...
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5007960 |
Method for removing chromium from chromium containing waste material
A method is provided for removing chromium from a chromium containing waste material wherein the waste material is dried by indirect heating, sized to a particle size of less than 0.105 mm, mixed...
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4695447 |
Destruction of inorganic hazardous wastes
Hazardous waste containing inorganic compounds which contain heavy metals or particular hazardous anionic groups or which are hazardous halides or non-metal oxides or sulfides is contacted with...
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4643884 |
Purification of molybdenum trioxide
A process is disclosed for removing potassium from relatively impure molybdenum trioxide. The process involves contacting the impure molybdenum trioxide containing greater than about 600 weight...
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4629503 |
Process for the recovery of tungsten in a pure form from tungsten-containing materials
The present invention relates to a simple process for the recovery of pure tungsten at a high yield from cemented tungsten carbide or tungsten alloys scrap. According to the invention the process...
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4629606 |
Recovery of tungsten compounds
The present invention provides a process for recovering a tungsten compound from a waste liquor containing a high-boiling organic compound and the tungsten compound, which process comprises the...
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4604267 |
Process for purifying molybdenum trioxide
Processes are described for preparing pure ammonium molybdate from impure roasted molybdenum concentrates. An aqueous solution of nitric acid, ammonium sulfate, and ammonium nitrate is contacted...
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4603043 |
Controllable nitrate fusion
A process for converting tungsten bearing material to sodium tungstate by adding an oxidizing reactant in small increments to a heated mixture of fused sodium hydroxide and the tungsten bearing...
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4599224 |
Recovery of molybdenum from molybdenum disulfide
A process is disclosed for recovering molybdenum from molybdenum disulfide. The process involves forming a slurry of the molybdenum disulfide in a solution of an alkali metal hydroxide, the amount...
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4560539 |
Removal of ammonia from sodium tungstate solutions
A process is disclosed for removing ammonia from a sodium tungstate solution. The process involves heating the solution at from about 80° C. to about 95° C., while at the same time maintaining...
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4555294 |
Inorganic composition adapted for use in bonding a high temperature resistant polymeric material to an aluminum base substrate
An inorganic composition adapted for use in bonding a high temperature resistant polymeric material to an aluminum base substrate is provided. The composition is obtained by reacting a first...
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4508701 |
Extraction of tungsten from spent or scrap catalyst materials
A spent or scrap tungsten-containing, aluminosilicate catalyst material is blended with a silicate-containing, tungsten-bearing ore concentrate in amounts such that at least about 2.0% by weight of...
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4504448 |
Activated carbon adsorption of flotation reagents from tungsten solutions
Foaming in the hydrometallurgical treatment of a tungsten-containing aqueous solution due to the presence of carbonaceous organic material impurities, such as flotation reagents, is substantially...
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4500350 |
Disintegration of chromites
In the disintegration of a chromite or chromium-containing residue, wherein the chromium-containing material is disintegrated with an alkaline compound in the presence of oxygen and a diluent at a...
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4495157 |
Recovery of metal values from spent hydrodesulfurization catalysts
A process is provided for recovering metal values from spent hydrodesulfurization catalyst, the process comprising forming in a pressure reactor an aqueous slurry of finely divided spent catalyst...
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4482526 |
Recovery of tungsten and molybdenum from sulfur-bearing material
Tungsten and molybdenum are recovered from sulfur bearing material such as sulfide sludges by a pollution free process in which the sulfur bearing material is heated with agitation in an aqueous...
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4457776 |
Process for the removal of arsenic compounds from tungsten or molybdenum concentrates
A process for the removal of arsenic compounds from tungsten and/or molybdenum concentrates by selective extraction, characterized in that the concentrates are extracted with an aqueous solution of...
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4454098 |
Process for reclaiming tungsten from a hazardous waste
A process is disclosed wherein tungsten is recovered from hazardous waste material containing said tungsten, arsenic, and other impurities which can consist of magnesium, phosphorus, and silicon...
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4444733 |
Process for recovering molybdenum and copper from sulfide concentrates
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...
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4432950 |
Recovery of refractory metal values from scrap cemented carbide
In a process for recovering refractory metal values from a refractory metal carbide cemented with a metal binder. The coated cemented carbide is treated with sulfuric acid to deteriorate the coating.
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4417972 |
Recovery of coal liquefaction catalysts
Metal constituents are recovered from the heavy bottoms produced during the liquefaction of coal and similar carbonaceous solids in the presence of a catalyst containing a metal capable of forming...
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4406866 |
Recovery of refractory metal values from scrap cemented carbide
In a process for recovering refractory metal values from a coated refractory metal carbide cemented with a metal binder, the coated cemented carbide is treated with hydrochloric acid to deteriorate...
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