Gte Products Corporation

Gte Sylvania Incorporated

John A Powers

James N Christini

Martin B MacInnis

Clarence D Vanderpool

Kenneth T Reilly

Alan D Douglas

David J Port

James C Patton, Jr

Methods are disclosed for recovering one or more of the metals of tungsten and molybdenum from metal-cellulose material. One method involves digesting the material in a mineral acid selected from the group consisting of hydrochloric acid having a concentration of at least about 4 normal, and sulfuric acid having a concentration of at least about 9 normal at a temperature of at least about 50.degree. C. for a sufficient time to form a digestion solid containing the major portion of the tungsten and a digestion solution containing a portion of any molybdenum which is present in the material, and separating the solid from the solution. Another method involves having as the starting material a metal-cellulose material comprising one or more of the metals of tungsten and molybdenum and elements selected from the group consisting of arsenic, phosphorus, silicon, and combinations thereof. The digestion is carried out as described above to form a digestion solution containing the major portion of any tungsten and molybdenum which is present, and a residue, followed by separating the digestion solution from the residue.

Recovery of tungsten and molybdenum

A tungsten extraction process wherein tungsten values are extracted from an aqueous alkali metal tungstate solution by an organic solution containing an amine extractant wherein the organic solution consists essentially of from about 6% to about 10% by volume of said amine extractant, and the balance of said organic solution being an aromatic solvent consisting essentially of a mixture of alkyl benzenes wherein the alkyl benzenes have molecular weights of 120, 134, or 148 and the total number of carbon atoms in the alkyl chains attached to the benzene ring are either 3, 4, or 5, and thereafter the tungstate values are removed from the organic solution by stripping with aqueous ammonia, is improved by carrying out the stripping step in the aqueous continuous mode, and having as the stripping agent, an aqueous solution of ammonium metatungstate having a tungsten concentration which allows the strip solution to have a specific gravity of no greater than about 1.5, the stripping agent having sufficient ammonia to maintain the pH of the stripping agent at from about 5 to about 8, with the temperature of the stripping agent being no greater than room temperature.

Process for recovering tungsten from organic solutions

A process is disclosed for separating tungsten from a solution containing tungstate and perrhenate ions. The process involves reacting a sufficient amount of hydrochloric acid with the solution at a sufficient temperature to form a solid containing essentially all of the tungsten and a liquor containing essentially all of the rhenium, and separating the solid from the liquor.

Separation of tungsten from rhenium

A method is disclosed for producing ammonium metatungstate from ammonium paratungstate. The method involves first roasting the ammonium paratungstate at from about 275.degree. C. to about 300.degree. C. for from about 10 hours to about 20 hours to remove some ammonia and some water. The roasted ammonium paratungstate is then added to dilute solution of an ammonium metatungstate which is at a pH of from about 3.6 to about 4.2, the rate of addition being such that a slurry is produced having a pH of from about 3.6 to about 4.2. The pH of the resulting slurry is then adjusted to stabilize it at from about 3.6 to about 4.2 followed by evaporation to form a relatively concentrated solution of ammonium metatungstate which is then separated from any insolubles. Ammonium metatungstate is then crystallized from the relatively concentrated ammonium metatungstate solution.

Method for producing ammonium metatungstate from ammonium paratungstate

A lubricating oil additive is produced by contacting an aqueous slurry of ammonium paratungstate with an organic phase comprising a major proportion by weight tertiary alkyl amines having the formula C.sub.n H.sub.2n+1 NH.sub.2, where n is from 18 to 22, to extract the tungsten into the organic phase from the aqueous phase while solid ammonium paratungstate is being solubilized into the aqueous phase. The aqueous phase is heated to drive off water so as to form the resulting lubricating oil additive.

Process of preparing lubricating oil additive containing tungsten

A flame spray powder of cobalt and molybdenum mixed metal agglomerates is produced by spray drying a slurry of molybdenum metal particles and cobalt oxide particles in an ammonium molybdate solution to produce agglomerates, and thereafter heating the agglomerates in a reducing atmosphere to convert the oxide particles to cobalt metal and the binder to molybdenum metal.

Growing community of inventors

New Albany, PA, United States of America

John A Powers