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: In a mine tool of the type having a drive body holding a bit, the drive body includes forwardly projecting flanges each having a bit engaging surface for transmitting torque to the bit and the bit includes an independent means for securing the bit to the drive body against forward separating movement.

Abstract: In a mine tool having a drive body, an insert is detachably held to the drive body in a slot formed by forwardly projecting flanges.

Abstract: 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.

Abstract: In a mine tool of the type having a drive body holding a bit, the bit and drive body include complimentary and mating surfaces wherein one pair of surfaces are adapted to be in overlapping relationship when the bit is twisted in a direction opposite the rotational direction for detachably mounting the bit to the drive body.

Abstract: A fine cobalt metal powder is produced from pieces of relatively pure cobalt by dissolving the cobalt pieces in an aqueous solution of hydrogen iodide and iodine and forming a cobalt containing solid which is subsequently reduced to a fine cobalt metal powder.

Abstract: 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 the coating.

Abstract: A uniform, large size tungsten powder having properties which make it suitable for producing large size tungsten carbide powder is produced by doping a tungsten oxide starting powder with a lithium compound prior to reduction

Abstract: In a mine tool of the type having a drive body holding a bit, the drive body includes a pair of forwardly projecting flanges forming air passages in proximity to the cutting edges for the conveyance of detritus.

Abstract: Gold is recovered from a material including gold and molybdenum or tungsten by contacting the material with an aqueous solution of hydrogen iodide and iodine to solubilize the gold without solubilizing the molybdenum or tungsten and recovering the gold from the solution.

Abstract: In a process for producing a refractory metal carbide grade powder, a metal carbide powder is heated above melting point of a wax prior to forming a blended mixture of metal carbide and wax which is subsequently milled with a metal binder in liquid milling medium incompatible with the wax and the mixture is dried to form a powder.

Abstract: Fine metal powder is produced from a wet cobaltic hydroxide precipitate by contacting the precipitate with steam to convert the precipitate to a cobaltous oxide and reducing the cobaltous oxide to produce a fine cobalt metal powder.

Abstract: A plasma spray powder having a substantially uniform composition consisting essentially of a metal selected from the group consisting of cobalt, nickel, iron, mixtures and alloys thereof the balance consisting essentially of tungsten and carbon in a ratio of about one mole of carbon per one mole of tungsten wherein the ratio of iron and nickel to cobalt is at least about 4 to one.

Abstract: In a continuous process for producing ammonium tungstate from aqueous alkali metal tungstate solution according to an extraction process, the loaded organic extractant is cleaned after stripping by contacting with activated carbon for improving phase separation and decreasing the concentration of alkali metal.

Abstract: In a two component extraction system for producing ammonium tungstate from aqueous alkali metal tungstate solution, the stripping solution consists essentially of water and from about 5 to about 21 percent by weight ammonium hydroxide at a pH of from about 12 to 13 wherein the stripping is carried out by dispersing the aqueous ammonia solution in the loaded organic extractant.

Abstract: In a three component extraction system for producing ammonium tungstate from aqueous alkali metal tungstate from aqueous alkali metal tungstate solution, the stripping solution consists essentially of water and from about 5 to about 21 percent ammonium hydroxide at a pH of from about 12 to about 13 wherein the stripping is carried out by dispersing the aqueous ammonia solution in the loaded organic extractant.

Abstract: After stripping tungsten values from a loaded organic extractant in a two component extraction system for producing ammonium tungstate from aqueous alkali metal tungstate solutions, the organic extractant and aqueous solution of ammonium tungstate are fed into a settling container which includes a pair of electrodes and means for applying a direct current voltage potential for promoting coalescence of the aqueous and organic phase.

Abstract: In a two component extraction system for producing ammonium tungstate from aqueous alkali metal tungstate from aqueous alkali metal tungstate solution, the stripped organic is washed to form a wash solution which is mixed with concentrated ammonia solution to form an aqueous ammonia solution which is mixed with product ammonia tungstate and fed as the stripping solution for contacting the loaded organic extractant.

Abstract: Tungsten is recovered from tungsten ore concentrates in the form of sodium tungstate by a basic process in which ground ore is first digested in a sodium hydroxide solution followed by diluting the solution to dissolve sodium tungstate separating the solution from the caustic insoluble sludge and crystallizing soluble sodium tungstate, wherein the present invention permits improved recovery of tungsten from difficult to process ores by the process steps of comminuting said tungsten ore concentrate to a particle size less than 325 mesh, adding said comminuted ore to aqueous sodium hydroxide at a concentration of at least 10 molar and digesting at a temperature of from about 75.degree. C. to 150.degree. C. for a sufficient period of time to convert substantially all of the tungsten values to soluble sodium tungstate, and diluting the mixture to reduce the sodium hydroxide concentration to between about 4.5 and 5.5 molar at a temperature below about 90.degree. C.

Abstract: Tungsten is recovered from tungsten ore concentrates in the form of sodium tungstate by a basic process in which ground ore is first digested in a sodium hydroxide solution followed by diluting the solution to dissolved sodium tungstate separating the solution from the caustic insoluble sludge and crystallizing soluble sodium tungstate, wherein the present invention permits improved recovery of tungsten from difficult to process ores by the process steps of comminuting said tungsten ore concentrate to a particle size less than about 200 mesh, adding the comminuted ore to an aqueous solution of sodium hydroxide at a temperature from about 10 to about 30 degrees centigrade, dispersing said comminuted ore in the aqueous solution of sodium hydroxide prior to digestion, digesting at a temperature of from about 75.degree. C. to about 150.degree. C.