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: 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 producing fine cobalt metal powder from scrap material containing brazing compositions, the scrap is digested with hydrochloric acid to form a cobalt chloride solution which the silver is removed by precipitation with a suitable alkali metal halide at a pH of about 7 to result in a cobalt amine chloride solution which is further processed to fine cobalt powder.

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: Selected portions of metal carbide are recovered from scrap material containing pieces of cemented metal carbide having various compositions of metal carbide distributed in a matrix material. The scrap material is treated with a suitable liquid for a sufficient period of time to dissolve the matrix material and form a piece of matrix depleted metal carbide which is introduced as a feed into a ferrofluid material. A magnetic field is passed through the ferrofluid for positioning pieces of metal carbide of the type having a heavier density spaced from pieces of metal carbide of a lighter density. The separated portions of matrix depleted metal carbide are collected to produce metal carbide powder which may be further reprocessed to produce a desired cemented metal carbide.

Abstract: The process is described wherein molybdenum values are separated from an aqueous solution containing tungsten. The molybdenum is converted to a thiomolybdate ion and the resulting solution is contacted with a suitable amount of organic extractant for a sufficient period of time to preferentially extract the thiomolybdate. The organic extractant including the thiomolybdate is separated from the aqueous solution comprising the unextracted tungsten values. The molybdenum values are stripped from the separated organic extractant by contacting with an aqueous solution containing sufficient amount of an oxidizing agent suitable for oxidizing the thiomolybdate complex ion to the molybdate ion which in turn is soluble in the aqueous solution. The organic extractant is then recycled for extracting the thiomolybdate complex ion and the molybdate ion may be recovered from the aqueous solution by conventional methods.

Abstract: In a process for producing ammonium metatungstate from ammonium paratungstate, ammonium paratungstate is introduced in the anode chamber of an electrolytic cell which is separated from the cathode chamber by an inert liquid permeable media, when a direct electric current is passed through the cell, ammonium ions migrate to the cathode compartment resulting in an increased concentration of metatungstate in the anode chamber.

Abstract: Disclosed is a process for removing molybdenum values from aqueous solutions containing tungsten values comprising sulfidizing said solution to an extent sufficient to convert substantially all of the molybdenum values to a thiomolybdate species, said sulfidizing being substantially less than the extent necessary to convert substantially all of said tungsten values to a thiotungstate species and contacting the resulting solution containing the thiomolybdate complex ion with a suitable amount of an organic extractant for a sufficient period of time to preferentially extract the thiomolybdate complex ion into the organic extractant, said organic extractant comprising an aromatic organic solvent and a quaternary ammonium compound of the formula R.sub.3 (CH.sub.3)N.sup.+ A.sup.-, wherein R is an alkyl group having from about 8 to 10 carbon atoms and A is an anion derived from a mineral acid.

Abstract: Cobalt is recovered from byproduct streams from a basic process by contacting the byproduct streams with aluminum metal for a sufficient period of time to produce cobalt metal as a precipitate. The basic process is the type wherein cobalt ions in solution are complexed with ammonia in the presence of halide ions to form an ammine halide solution from which a cobalt containing precipitate is separated. The precipitate is subsequently reduced to form a cobalt metal powder.

Abstract: Ferric iron is removed from an aqueous chloride solution containing other cations by extracting ferric iron with a liquid organic extractant comprising a ketone having less than about eight carbon atoms for a sufficient period of time to extract ferric iron into the organic liquid extractant. The organic liquid extractant is separated from the aqueous chloride solution containing other cations and the ferric iron is stripped from the organic liquid.

Abstract: Cobalt is recovered from by-product streams from a basic process by heating the by-product streams containing ammonia for a sufficient period of time at a pH of about 8 to about 10 to produce an ammonia enriched vapor and an aqueous mixture comprising a solution substantially free of ammonia and another cobalt containing precipitate. The basic process is the type wherein cobalt ions in solution are complexed with ammonia in the presence of halide ions to form an ammine halide solution which is digested to form a cobalt containing precipitate. The precipitate is subsequently reduced to form a cobalt metal powder.

Abstract: A process is disclosed wherein essentially all of the rhenium can be removed from an aqueous solution of molybdenum without the extraction of molybdenum using a particular solvent extraction solution. The extraction solution consists essentially of quaternary ammonium compound and at least about 50 percent by volume of a highly aromatic solvent which dissolves a quaternary ammonium-rhenium complex to the extent of at least 0.1 percent by volume selected from the group consisting of benzene and an aromatic solvent containing primarily lower alkyl benzenes having molecular weights of either 106, 120, 134 or 148 with minor amounts of relatively long chain aliphatic hydrocarbons containing greater than 8 carbon atoms and minor amounts of napthalene.

Abstract: Aqueous solutions or slurries consisting essentially of water, ammonium hydrogen orthophosphate and urea wherein the amount of urea is from about one-half of the orthophosphate to about equal to the orthophosphate on a molar basis are useful in providing a fire-retardant coating on wood fibers when such fibers and a thermosetting resin are consolidated, under the simultaneous application of heat and pressure, to produce a panel having a density of at least 0.5 grams per cubic centimeter. The useful range of compositions thus contain a P:C atomic ratio of from about 1:1 to about 2:1.

Abstract: A process is disclosed wherein essentially all of the rhenium can be removed from an aqueous solution of molybdenum without the extraction of molybdenum using a particular solvent extraction solution. The extraction solution consists essentially of a quaternary ammonium compound and at least about 50% by volume of a highly aromatic solvent which dissolves a quaternary ammonium-rhenium complex to the extent of at least 0.1% by volume.

Abstract: Heteropoly acids of tungsten and molybdenum, such as tungstosilicic acid and molybdosilicic acid, are produced by first preparing an aqueous solution of an alkali metal tungstate or molybdate and an alkali metal salt of the hetero atom, and then removing the alkali metal cations from the solution by means of a cation exchange membrane under the influence of an applied electrical potential, whereby the reactive tungstate or molybdate and hetero species anions react to form the desired heteropoly acid.

Abstract: A process suitable for recovering refractory metal carbide values from contaminated uncemented refractory metal carbides containing an iron group metal comprises heating an admixture of the powders of the contaminated refractory metal carbides and glacial acetic acid to the boiling point of the admixture for at least about 30 minutes, the weight of the powders divided by the weight of the acid is less than 5, thereafter removing the resulting carbide solids from the acid and washing the solids with sufficient water to remove the residual acid and drying the solids.

Abstract: Ammonium tungstate, ammonium paratungstate, ammonium metatungstate or hydrated tungsten trioxide is produced by passing tungstate anions through an anion exchange membrane into an aqueous solution containing ammonium cations under the driving force of an electrical potential for a time sufficient to achieve a pH within the range in which the desired tungsten compound will form.