Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group iib metal
Reexamination Certificate
2005-03-08
2005-03-08
Bos, Steven (Department: 1754)
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group iib metal
C423S104000, C423S622000
Reexamination Certificate
active
06863873
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. The process removes Arsenic and Fluorides in the feed material. The process also solves the problem of chloride contamination in the zinc oxide and prevents heavy metal contaminants in the hydrometallurgically produced zinc oxide derived from feed stocks containing chlorides or when chlorides are used to leach the metal bearing feed stocks. In one embodiment, calcium and/or magnesium compounds are added to the iron bearing waste to increase the recovery of zinc and other non-ferrous metals and to produce an iron bearing flux. The process is environmentally friendly and fully recycles all streams.
REFERENCES:
patent: 863411 (1907-08-01), Maclvor
patent: 999420 (1911-08-01), Wannschaff et al.
patent: 1863700 (1932-06-01), Seguine, Jr.
patent: 3849121 (1974-11-01), Burrows
patent: 4039406 (1977-08-01), Stanley et al.
patent: 4724132 (1988-02-01), Fabry
patent: 4888053 (1989-12-01), Grayson et al.
patent: 5078786 (1992-01-01), Peters et al.
patent: 5431713 (1995-07-01), Myerson et al.
patent: 5538532 (1996-07-01), Keegel, Jr.
patent: 5582631 (1996-12-01), Myerson et al.
patent: 5667553 (1997-09-01), Keegel, Jr.
patent: 5683488 (1997-11-01), Myerson et al.
patent: 5709730 (1998-01-01), Cashman
patent: 5759503 (1998-06-01), Myerson et al.
patent: 5942198 (1999-08-01), Myerson et al.
Hoboy Loren P.
Wolf Nick A.
Yoder Tonya F.
Bos Steven
Christensen O'Connor Johnson & Kindness PLLC
Whitman Chester W.
LandOfFree
Process to produce simonkolleite, zinc oxide and zinc hydroxide does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process to produce simonkolleite, zinc oxide and zinc hydroxide, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process to produce simonkolleite, zinc oxide and zinc hydroxide will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3389986