Union Carbide Corporation

U.S. Vanadium Corporation

Umetco Minerals Corporation

Donald J Hansen

John B Goddard

William B De Atley

Robert L Ripley

Oreste J Malacarne

David O Skiles

George F Curtis

Sundaresan Ramachandran

Method of operating a heap leach for leaching uranium and vanadium from a uranium-vanadium bearing ore formed into a relatively tall heap from a mixture of coarsely crushed ore and concentrated sulfuric acid which involves leaching the heap in sections with each section leached in multiple cycles following a predetermined procedure in which the heap is first leached with dilute acid followed by a strong acid application. The product effluent from the strong acid application is recycled a multiple number of times and advanced to the next section. Each section is then washed with fresh water.

Method of operating a heap leach for recovering uranium and vanadium

Vanadium is recovered from vanadium-containing ores that have been roasted in the presence of a sodium source through heap leaching with an aqueous leaching solution so that high grade leach liquors can be obtained.

Method for recovering vanadium from vanadium-containing ore

Method of electrodepositing manganese metal from a manganese metal electrolyte which contains small quantities of sulfur dioxide, selenium and a polyacrylamide compound. The electrodeposited manganese is smoother and exhibits less 'treeing', i.e. dendritic growths and high current efficiencies are achieved.

Method for electrolytic deposition of manganese

Oxidation of ferrophosphorous in an oxidizing environment wherein molten ferrophosphorous is continuously contacted with a surface of oxidized ferrophosphorous.

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Lewiston, NY, United States of America

Donald J Hansen