Michael J Cheresnowsky

46018905, Jul 22, 1986

Mar 27, 1985

6/716726

Michael J. Cheresnowsky - Towanda PA

GTE Products Corporation - Stamford CT

C01G 3900

423 54

Processes are described for preparing pure ammonium molybdate from impure roasted molybdenum concentrates. An aqueous solution of hydrochloric acid and ammonium nitrate is contacted with impure molybdenum concentrate to solubilize a major portion of the impurities. The resulting molybdenum concentrate is digested in ammonium hydroxide under conditions that maximize iron precipitation and removal. The resulting ammonium molybdate solution is separated from the sludge and further purified by chelating cation exchange resin in the ammonium form.

47028955, Oct 27, 1987

May 2, 1986

6/859290

Michael J. Cheresnowsky - Towanda PA
Timothy A. Brunelli - Wyalusing PA
Tai K. Kim - Towanda PA

GTE Products Corporation - Stamford CT

C01G 3900

423 54

A method is disclosed for purifying molybdenum which involves adding to an ammoniacal ammonium molybdate solution containing the impurities of phosphorus and arsenic with the phosphorus concentration being from about 0. 01 to about 0. 12 g/l, a soluble magnesium salt to form a precipitate comprising magnesium ammonium salts of the phosphorus and arsenic, and to form a purified ammonium molybdate solution. The amount of the magnesium salt is sufficient to result in a concentration of from about 0. 005 to about 0. 04 moles/l in the ammoniacal ammonium molybdate solution. The resulting purified ammonium molybdate contains no greater than about 0. 01 g P/l. The precipitate is separated from the purified solution which is then contacted with a chelating cation exchange resin supplying a sufficient amount of a cation to result in removal of the major portion of the magnesium ions from the purified solution and form a further purified ammonium molybdate solution.

46438840, Feb 17, 1987

Mar 31, 1986

6/846170

Michael J. Cheresnowsky - Towanda PA
Timothy A. Brunelli - Wyalusing PA
Robin W. Munn - Sayre PA

GTE Products Corporaton - Stamford CT

C01G 3902

423 53

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 parts potassium per million with a first acid leach which consists essentially of nitric acid and ammonium nitrate at a temperature of at least about 50. degree. C. for a sufficient time and at above a 2 molar concentration of said nitric acid and an ammonium nitrate concentration of from about 1. 5 to about 2 molar in said first acid leach to solubilize the major portion of the potassium and form a once leached molybdenum trioxide containing the remaining portion of the potassium which is separated from the resulting potassium containing acid leach and contacted with a second leach solution substantially similar to the first acid leach followed by separating the resulting twice leached molybdenum trioxide from the resulting potassium containing second leach. The twice leached molybdenum trioxide is contacted with sufficient water to remove any residual impurities followed by removal of the resulting wash water.

48141488, Mar 21, 1989

Apr 4, 1988

7/177224

Michael J. Cheresnowsky - Towanda PA
Judy L. Scheftic - South Waverly PA

GTE Products Corporation - Stamford CT

C01G 3900

423 55

A method is disclosed for purifying ammonium dimolybdate which comprises dissolving ammonium dimolybdate containing arsenic as an impurity in water to form an ammonium molybdate solution and insolubles containing essentially all of the arsenic, filtering off the insolubles from the solution, adjusting the pH of the solution to at least about 9. 0 and then crystallizing pure ammonium dimolybdate from the solution wherein the arsenic content is less than about 8 weight ppm.

47986239, Jan 17, 1989

Feb 19, 1988

7/157669

Michael J. Cheresnowsky - Towanda PA

GTE Products Corporation - Stamford CT

B22F 926

75 05AA

A method is disclosed for producing fine cobalt metal powder which comprises adding to a solution of cobaltous chloride, sodium hydroxide in an amount equal to at least the stoichiometric amount required to form a precipitate of the major portion of the cobalt as cobaltous hydroxide and a mother liquor containing the balance of the starting cobalt, separating the precipitate from the mother liquor, water washing the precipitate to remove essentially all of the sodium therefrom, and reducing the precipitate to fine cobalt metal powder having an FSSS of from about 0. 5 to about 2. Drying of the precipitate before reduction results in the fine cobalt metal powder having essentially no tailings.

50027409, Mar 26, 1991

Jan 26, 1989

7/304303

Michael J. Cheresnowsky - Towanda PA
Judy L. Scheftic - South Waverly PA

GTE Products Corporation - Stamford CT

C01G 3700

423 56

A process is disclosed for purifying molybdenum containing arsenic and phosphorus which involves leaching molybdenum trioxide in an acid at a temperature of above about 70. degree. C. to remove impurities from the molybdenum trioxide and produce a partially purified molybdenum trioxide, adding to an acidic slurry of the leached molybdenum trioxide, a source of magnesium ions in a solid form with the amount of magnesium and the magnesium ion concentration in the subsequently formed ammonium molybdate solution being sufficient to subsequently form insoluble material containing greater than about 80% by weight of the arsenic and greater than about 80% by weight of the phosphorus, and ammonia in an amount sufficient to subsequently dissolve the molybdenum and subsequently form the insoluble material, digesting the resulting ammoniated slurry at a temperature sufficient to dissolve the molybdenum and form an ammonium molybdate solution while the pH is maintained at from about 9 to about 10 to form the insoluble material wherein the arsenic is present as magnesium ammonium arsenate and the phosphorus is present as magnesium ammonium phosphate, and separating the insoluble material from the ammonium molybdate solution.

45253315, Jun 25, 1985

Feb 24, 1984

6/584843

Michael J. Cheresnowsky - Towanda PA
Timothy A. Brunelli - Towanda PA
Robin W. Munn - Sayre PA
Tai K. Kim - Towanda PA

GTE Products Corporation - Stamford CT

C01G 3900

423 54

Processes are described for preparing pure ammonium molybdate from impure roasted molybdenum concentrates. An aqueous solution of nitric acid and ammonium nitrate is contacted with impure molybdenum concentrate to solubilize a major portion of the impurities. The resulting molybdenum concentrate is digested in ammonium hydroxide under conditions that maximize iron precipitation and removal. The resulting ammonium molybdate solution is separated from the sludge and further purified by chelating cation exchange resin in the ammonium form.

47241284, Feb 9, 1988

Jul 20, 1987

7/075802

Michael J. Cheresnowsky - Towanda PA
Edward L. Bok - Sayre PA
Martin B. MacInnis - Towanda PA

GTE Products Corporation - Stamford CT

C01G 3700

423 53

A method is disclosed for purifying molybdenum which involves reducing a molybdenum compound selected from the group consisting of molybdenum trioxide, ammonium dimolybdate, and ammonium paramolybdate to molybdenum dioxide which is then water washed to remove potassium, and produce a purified molybdenum dioxide having a potassium content of no greater than about 30 weight ppm, followed by separating the wash water from the purified molybdenum dioxide.