Gte Products Corporation

Timothy J Hoffman

Michael J Cheresnowsky

Clarence D Vanderpool

Robert G Mendenhall

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 solution as molybdenum trioxide and then separating, washing and drying the molybdenum trioxide.

Removal of potassium from ammonium molybdate

A method is disclosed for removing carbon from the surface of a cemented tungsten carbide article which comprises contacting a cemented tungsten carbide article with an aqueous solution of hydrogen peroxide having a concentration of at least about 5% by volume hydrogen perioxide for a sufficient length of time to remove the major portion of the carbon from the surfaces of the article.

Method for removing carbon from cemented tungsten carbide articles

A method is disclosed for removing iron from iron-contaminated sulfuric acid to render the sulfuric acid suitable for ion membrane processing which comprises contacting the iron-contaminated sulfuric acid with an oxidizing agent to oxidize essentially all of the iron to the +3 oxidation state, contacting the resulting iron-contaminated sulfuric acid containing oxidized iron with a complexing agent which can be citric acid, oxalic acid, and tartaric acid, with the amount of the complexing agent being sufficient to complex essentially all of the oxidized iron, and contacting the resulting iron-contaminated sulfuric acid containing the complexed iron with activated carbon to remove essentially all of the iron and produce a purified sulfuric acid solution.

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Towanda, PA, United States of America

Timothy J Hoffman