Tonya F Yoder

US Patent:

6863873, Mar 8, 2005

Filed:

Sep 23, 2003

Appl. No.:

10/669146

Inventors:

Loren P. Hoboy - Anacortes WA, US
Nick A. Wolf - Covington WA, US
Tonya F. Yoder - Vashon Island WA, US

International Classification:

C22B019/00

US Classification:

423103, 423104, 423622

Abstract:

A hydrometallurgical process utilizing an atmospheric calcium chloride leach to selectively recover from various metal feed stocks (consisting of elemental metals, metal oxides, metal ferrite, metal hydroxide, metal carbonates, metal sulfate/sulfur compounds, and their hydrates, specifically including but not limited to EAF Dust K061) zinc, lead, cadmium, silver, copper and other valuable metals to the exclusion of iron, magnesium, halogen salts and other unwanted elements. The process solves the problem of iron and magnesium leach solution contamination because iron is unexpectedly converted to magnetite. The heavy metals are cemented out of solution using zinc or other selected dust at a pH of 6 or greater under unique and unexpected conditions, which do not require acid. Simonkolleite/zinc- oxychloride/zinc-hydroxide is produced from the purified zinc chloride complex pregnant leach solution and is converted directly to high purity active rubber grade 99+% zinc oxide having small particle size and high surface area. The products are metal concentrates suitable for: metal refiner/processors, production of elemental metal, or other conversion processes.

US Patent:

6770249, Aug 3, 2004

Filed:

Jan 5, 2000

Appl. No.:

09/478625

Inventors:

Loren P. Hoboy - Anacortes WA
Nick A. Wolf - Covington WA
Tonya F. Yoder - Vashon Island WA

Assignee:

Chester W. Whitman - Vashon Island WA

International Classification:

C22B 700

US Classification:

423 38, 423 98, 423109, 4231501, 4231503

Abstract:

A hydrometallurgical process utilizing an atmospheric calcium chloride leach to selectively recover from various metal feed stocks (consisting of elemental metals, metal oxides, metal ferrite, metal hydroxide, metal carbonates, metal sulfate/sulfur compounds, and their hydrates, specifically including but not limited to EAF Dust KO61) zinc, lead, cadmium, silver, copper and other valuable metals to the exclusion of iron, magnesium, halogen salts and other unwanted elements. The process solves the problem of iron and magnesium leach solution contamination because iron is unexpectedly converted to magnetite. The heavy metals are cemented out of solution using zinc or other selected dust at a pH of 6 or greater under unique and unexpected conditions, which do not require acid. Simonkolleite/zinc-oxychloride/zinc-hydroxide is produced from the purified zinc chloride complex pregnant leach solution and is converted directly to high purity active rubber grade 99+% zinc oxide having small particle size and high surface area. The products are metal concentrates suitable for: metal refiner/processors, production of elemental metal, or other conversion processes.