Tungsten recovery from carbides

Patent · Tue Aug 06 04:00:00 EDT 1985

OSTI ID:6464617

Farrell, G; Anderson, D M; Walton, M E

Tungsten can be extracted into solution from tungsten carbide powder residues with aqueous hydrogen peroxide to a greater extent by employing in solution a catalytic quantity of hydrochloric acid) such as a mole ratio to the tungsten preferably in the range of at least 0.1:1 moles of HC1 per mole tungsten, and often up to about 2.5 moles of HC1 per mole of tungsten at 55/sup 0/ to 85/sup 0/ C. The selection of the mole ratio in practice usually takes into account the grade of tungsten carbide starting material. It is very preferable to use at least 7 moles hydrogen peroxide per mole of tungsten and aan extraction temperature of 65/sup 0/ to 75/sup 0/ C.

• Assignee: Intenex Chemicals Limited (United Kingdom)
• Patent Number(s): US 4533527
• OSTI ID: 6464617
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320305* -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Industrial Waste Management
CARBIDES
CARBON COMPOUNDS
ELEMENTS
EXTRACTION
HYDROCHLORIC ACID
HYDROGEN COMPOUNDS
HYDROGEN PEROXIDE
INORGANIC ACIDS
MANAGEMENT
MATERIALS RECOVERY
MEDIUM TEMPERATURE
METALS
OXYGEN COMPOUNDS
PEROXIDES
PROCESSING
RECOVERY
REFRACTORY METAL COMPOUNDS
SCRAP
SCRAP METALS
SEPARATION PROCESSES
SOLID WASTES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TUNGSTEN
TUNGSTEN CARBIDES
TUNGSTEN COMPOUNDS
WASTE MANAGEMENT
WASTE PROCESSING
WASTES