Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group iva metal
Reexamination Certificate
2011-08-16
2011-08-16
Bos, Steven (Department: 1736)
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group iva metal
C423S093000, C423S095000, C423S098000, C423S435000, C423S619000
Reexamination Certificate
active
07998440
ABSTRACT:
An outstandingly low environmental impact wet process recovers the lead content of an electrode slime and/or of lead minerals in the valuable form of high purity lead oxide or compound convertible to highly pure lead oxide by heat treatment in oven at relatively low temperature, perfectly suited for making active electrode pastes of new batteries or other uses. The process basically comprises the following treatments:a) suspending the impure lead containing material in an aqueous bath containing at least a lead oxide dissolving acid;b) reducing any insoluble lead dioxide to lead oxide by introducing in the suspension either hydrogen peroxide, a sulphite or sulphurous anhydride;c) converting all dissolved lead oxide to lead sulphate in the aqueous bath;d) obtaining a solution of lead sulphate obtained in an aqueous solution containing an acetate salt;e) precipitating and separating a purified lead compound in the form of either carbonate/oxycarbonate or of oxide/or hydroxide by adding to said acetate salt solution a carbonate salt or a hydroxide of the same cation of said acetate salt, respectively.Exemplary flow sheets according to several alternative embodiments and related processing plant diagrams are disclosed.
REFERENCES:
patent: 2152242 (1939-03-01), Curtin
patent: 2187749 (1940-01-01), Marvin
patent: 4220628 (1980-09-01), Striffler, Jr. et al.
patent: 4269811 (1981-05-01), Striffler, Jr. et al.
patent: 4769116 (1988-09-01), Olper et al.
patent: 4927510 (1990-05-01), Olper et al.
patent: 5127963 (1992-07-01), Hartup et al.
patent: 1619261 (2006-01-01), None
patent: 2183623 (1987-06-01), None
patent: WO-0121846 (2001-03-01), None
patent: WO-2005007904 (2005-01-01), None
Bos Steven
Connolly Bove & Lodge & Hutz LLP
Millbrook Lead Recycling Technologies Limited
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