Foote Mineral Company

Cabot Corporation

Cyprus Power Company

Cyprus Foote Mineral Company

Leak Sensors, Inc.

Caboi Corporation

Patrick M Brown

Daniel A Boryta

Susan R Jacob

Rong-Chein R Wu

Jerry Dobson

Raymond C Pedicone

Michael G Madara

Robert A Hard

Bart F Bakke

Michael C Northrup

James E Reynolds

Enzo L Coltrinari

James Reynolds

Donna D Harbuck

G Kyle Green

Charles E Falletta

Wayne T Barrett

Susan J Beckerman

Kerry A McDonald

Eugenio Iasillo

A process for selectively extracting metal values, including, uranium, thorium, scandium and zirconium, from starting materials which include the metal values. The process is particularly well suited to extracting metal and recovering metal values from tantalum/niobium production process ore residues.

Recovery of metal values

A process for producing valve metal oxides, such as tantalum pentoxide or niobium pentoxide with a narrow particle size distribution within a desired particle size range, is provided. According to the process of the present invention, the valve metal fraction from digestion of valve metal material containing ore is processed under controlled temperature, pH, and residence time conditions to produce the valve metal pentoxide and pentoxide hydrates. Also, disclosed are new tantalum pentoxide and niobium pentoxide products and new tantalum pentoxide precursors and niobium pentoxide precursors.

Process for producing niobium and tantalum compounds

The processes of the present invention include mineral acid leaching of a metal containing material, such as an ore residue, containing fluoridated metal values in the presence of a complexing agent which will complex fluoride ions. The processes of the present invention provide for the separation of valuable metal, fluoride and radionuclide values from a feed material of high mineral content wherein the metals and radionuclides are present as substantially water insoluble fluorides or are trapped within a metal fluorine matrix which is substantially insoluble in typical chemical reactant systems.

Method for solubilizing metal values

Disclosed is a method for producing a predetermined cesium compound. The method comprises treating a cesium-containing material with a suitable reagent to dissolve at least a portion of the cesium contained in the material and form a slurry; adding a base comprising slaked lime or calcium carbonate and an acid containing the anion of the predetermined cesium compound to the slurry comprising the dissolved cesium; and separating the predetermined cesium compound. In one embodiment of the invention there is provided a method for producing a predetermined cesium compound from an ore comprising cesium aluminosilicate comprising: treating an ore comprising cesium aluminosilicate with an acid to form a slurry and dissolve at least a portion of the cesium contained in the ore; adding a base comprising slaked lime or calcium carbonate and a quantity of an acid containing the anion of the predetermined cesium compound to the slurry comprising dissolved or solubilized cesium; and separating the predetermined cesium compound. A drilling fluid or heavy medium separation fluid comprising the predetermined cesium compound of the process and having a specific gravity of between about 1.2 g/cm and about 2.5 g/cm and having less than 85% by weight of the predetermined cesium compound on a solution basis is also disclosed.

Process for producing a predetermined cesium compound

Disclosed is a method for producing a predetermined cesium compound. The method comprises treating a cesium-containing material with a suitable reagent to dissolve at least a portion of the cesium contained in the material and form a slurry; adding a base comprising slaked lime or calcium carbonate and an acid containing the anion of the predetermined cesium compound to the slurry comprising the dissolved cesium; and separating the predetermined cesium compound. In one embodiment of the invention there is provided a method for producing a predetermined cesium compound from an ore comprising cesium aluminosilicate comprising: treating an ore comprising cesium aluminosilicate with an acid to form a slurry and dissolve at least a portion of the cesium contained in the ore; adding a base comprising slaked lime or calcium carbonate and a quantity of an acid containing the anion of the predetermined cesium compound to the slurry comprising dissolved or solubilized cesium; and separating the predetermined cesium compound. A drilling fluid or heavy medium separation fluid comprising the predetermined cesium compound of the process and having a specific gravity of between about 1.2 g/cm.sup.3 and about 2.5 g/cm.sup.3 and having less than 85% by weight of the predetermined cesium compound on a solution basis is also disclosed.

Process for producing purified cesium compound from cesium alum

The present invention provides a novel method of extracting zinc from geothermal brines and synthetic brines which can be performed in a continuous, in-line process.

Method of extracting zinc from brines

The present invention provides an improved method of extracting zinc from geothermal brines and synthetic brines which can be performed in a continuous, in-line process and which provides for the advantageous recycling of NH.sub.3 in the process.

Method of extracting zinc lead and silver from brines

The present invention relates to a novel process for producing, from a lithium-containing brine, a low boron lithium carbonate compound. This compound is particularly useful for conversion to a highly pure lithium chloride for the production of lithium metal by electrolysis.

Production of low boron lithium carbonate from lithium-containing brine

The present invention relates to a novel process for producing, from a lithium-containing brine, a substantially pure lithium chloride product. This product is particularly useful for the production of lithium metal by electrolysis.

Production of lithium metal grade lithium chloride from

A system for determining the location of a leak in a pond liner made of electrically insulating material supported by a medium which is electrically conductive consists of a movable nozzle for directing a stream of an electrically conductive liquid against the liner, a ground electrode connected to the electrically conductive supporting medium exterior of the pond and liner, a current source connected between the nozzle and the ground electrode, and a galvanometer located in the electrical circuit comprising the nozzle, current source and ground electrode for monitoring at least one electrical property in the circuit when a change in an electrical property occurs as a result of the stream of electrically conductive liquid completing the circuit by contacting the supporting medium through a hole in the liner.

Method for determining the location of a leak in a pond liner formed of

A novel flux for glass compositions which is an eutectic mixture of lithium carbonate and sodium sulfate (liquidus temperature 496.degree. C.) is used in fiberizable glass compositions to improve fluidity and reduce the temperature of fusion of the raw materials of which the glass is formed.

Eutectic mixture as a flux for glass melts

Lithium chloride containing small amounts of inorganic and/or organic impurities is purified by heating the lithium chloride above about 200.degree. C., cooling the compound to ambient temperatures and extracting it with isopropanol, separating the liquid and solid phases, removing the isopropanol and recovering lithium chloride of high purity.

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Exton, PA, United States of America

Patrick M Brown